From: Max Gurtovoy <mgurtovoy@nvidia.com>
Date: Thu, 26 Aug 2021 13:39:00 +0300
Subject: vfio/pci: Rename vfio_pci.c to vfio_pci_core.c
Git-commit: 1cbd70fe37870b938463fd0a4a07e45fc4a3db3c
Patch-mainline: v5.15-rc1
References: bsc#1205701
This is a preparation patch for separating the vfio_pci driver to a
subsystem driver and a generic pci driver. This patch doesn't change any
logic.
Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Link: https://lore.kernel.org/r/20210826103912.128972-2-yishaih@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Joerg Roedel <jroedel@suse.de>
---
drivers/vfio/pci/Makefile | 2
drivers/vfio/pci/vfio_pci.c | 2319 ---------------------------------------
drivers/vfio/pci/vfio_pci_core.c | 2319 +++++++++++++++++++++++++++++++++++++++
3 files changed, 2320 insertions(+), 2320 deletions(-)
--- a/drivers/vfio/pci/Makefile
+++ b/drivers/vfio/pci/Makefile
@@ -1,6 +1,6 @@
# SPDX-License-Identifier: GPL-2.0-only
-vfio-pci-y := vfio_pci.o vfio_pci_intrs.o vfio_pci_rdwr.o vfio_pci_config.o
+vfio-pci-y := vfio_pci_core.o vfio_pci_intrs.o vfio_pci_rdwr.o vfio_pci_config.o
vfio-pci-$(CONFIG_VFIO_PCI_IGD) += vfio_pci_igd.o
vfio-pci-$(CONFIG_S390) += vfio_pci_zdev.o
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/dev/null
@@ -1,2319 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
- * Author: Alex Williamson <alex.williamson@redhat.com>
- *
- * Derived from original vfio:
- * Copyright 2010 Cisco Systems, Inc. All rights reserved.
- * Author: Tom Lyon, pugs@cisco.com
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/device.h>
-#include <linux/eventfd.h>
-#include <linux/file.h>
-#include <linux/interrupt.h>
-#include <linux/iommu.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/notifier.h>
-#include <linux/pci.h>
-#include <linux/pm_runtime.h>
-#include <linux/slab.h>
-#include <linux/types.h>
-#include <linux/uaccess.h>
-#include <linux/vfio.h>
-#include <linux/vgaarb.h>
-#include <linux/nospec.h>
-#include <linux/sched/mm.h>
-
-#include "vfio_pci_private.h"
-
-#define DRIVER_VERSION "0.2"
-#define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
-#define DRIVER_DESC "VFIO PCI - User Level meta-driver"
-
-static char ids[1024] __initdata;
-module_param_string(ids, ids, sizeof(ids), 0);
-MODULE_PARM_DESC(ids, "Initial PCI IDs to add to the vfio driver, format is \"vendor:device[:subvendor[:subdevice[:class[:class_mask]]]]\" and multiple comma separated entries can be specified");
-
-static bool nointxmask;
-module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR);
-MODULE_PARM_DESC(nointxmask,
- "Disable support for PCI 2.3 style INTx masking. If this resolves problems for specific devices, report lspci -vvvxxx to linux-pci@vger.kernel.org so the device can be fixed automatically via the broken_intx_masking flag.");
-
-#ifdef CONFIG_VFIO_PCI_VGA
-static bool disable_vga;
-module_param(disable_vga, bool, S_IRUGO);
-MODULE_PARM_DESC(disable_vga, "Disable VGA resource access through vfio-pci");
-#endif
-
-static bool disable_idle_d3;
-module_param(disable_idle_d3, bool, S_IRUGO | S_IWUSR);
-MODULE_PARM_DESC(disable_idle_d3,
- "Disable using the PCI D3 low power state for idle, unused devices");
-
-static bool enable_sriov;
-#ifdef CONFIG_PCI_IOV
-module_param(enable_sriov, bool, 0644);
-MODULE_PARM_DESC(enable_sriov, "Enable support for SR-IOV configuration. Enabling SR-IOV on a PF typically requires support of the userspace PF driver, enabling VFs without such support may result in non-functional VFs or PF.");
-#endif
-
-static bool disable_denylist;
-module_param(disable_denylist, bool, 0444);
-MODULE_PARM_DESC(disable_denylist, "Disable use of device denylist. Disabling the denylist allows binding to devices with known errata that may lead to exploitable stability or security issues when accessed by untrusted users.");
-
-static inline bool vfio_vga_disabled(void)
-{
-#ifdef CONFIG_VFIO_PCI_VGA
- return disable_vga;
-#else
- return true;
-#endif
-}
-
-static bool vfio_pci_dev_in_denylist(struct pci_dev *pdev)
-{
- switch (pdev->vendor) {
- case PCI_VENDOR_ID_INTEL:
- switch (pdev->device) {
- case PCI_DEVICE_ID_INTEL_QAT_C3XXX:
- case PCI_DEVICE_ID_INTEL_QAT_C3XXX_VF:
- case PCI_DEVICE_ID_INTEL_QAT_C62X:
- case PCI_DEVICE_ID_INTEL_QAT_C62X_VF:
- case PCI_DEVICE_ID_INTEL_QAT_DH895XCC:
- case PCI_DEVICE_ID_INTEL_QAT_DH895XCC_VF:
- return true;
- default:
- return false;
- }
- }
-
- return false;
-}
-
-static bool vfio_pci_is_denylisted(struct pci_dev *pdev)
-{
- if (!vfio_pci_dev_in_denylist(pdev))
- return false;
-
- if (disable_denylist) {
- pci_warn(pdev,
- "device denylist disabled - allowing device %04x:%04x.\n",
- pdev->vendor, pdev->device);
- return false;
- }
-
- pci_warn(pdev, "%04x:%04x exists in vfio-pci device denylist, driver probing disallowed.\n",
- pdev->vendor, pdev->device);
-
- return true;
-}
-
-/*
- * Our VGA arbiter participation is limited since we don't know anything
- * about the device itself. However, if the device is the only VGA device
- * downstream of a bridge and VFIO VGA support is disabled, then we can
- * safely return legacy VGA IO and memory as not decoded since the user
- * has no way to get to it and routing can be disabled externally at the
- * bridge.
- */
-static unsigned int vfio_pci_set_decode(struct pci_dev *pdev, bool single_vga)
-{
- struct pci_dev *tmp = NULL;
- unsigned char max_busnr;
- unsigned int decodes;
-
- if (single_vga || !vfio_vga_disabled() || pci_is_root_bus(pdev->bus))
- return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
- VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
-
- max_busnr = pci_bus_max_busnr(pdev->bus);
- decodes = VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
-
- while ((tmp = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, tmp)) != NULL) {
- if (tmp == pdev ||
- pci_domain_nr(tmp->bus) != pci_domain_nr(pdev->bus) ||
- pci_is_root_bus(tmp->bus))
- continue;
-
- if (tmp->bus->number >= pdev->bus->number &&
- tmp->bus->number <= max_busnr) {
- pci_dev_put(tmp);
- decodes |= VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
- break;
- }
- }
-
- return decodes;
-}
-
-static inline bool vfio_pci_is_vga(struct pci_dev *pdev)
-{
- return (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
-}
-
-static void vfio_pci_probe_mmaps(struct vfio_pci_device *vdev)
-{
- struct resource *res;
- int i;
- struct vfio_pci_dummy_resource *dummy_res;
-
- for (i = 0; i < PCI_STD_NUM_BARS; i++) {
- int bar = i + PCI_STD_RESOURCES;
-
- res = &vdev->pdev->resource[bar];
-
- if (!IS_ENABLED(CONFIG_VFIO_PCI_MMAP))
- goto no_mmap;
-
- if (!(res->flags & IORESOURCE_MEM))
- goto no_mmap;
-
- /*
- * The PCI core shouldn't set up a resource with a
- * type but zero size. But there may be bugs that
- * cause us to do that.
- */
- if (!resource_size(res))
- goto no_mmap;
-
- if (resource_size(res) >= PAGE_SIZE) {
- vdev->bar_mmap_supported[bar] = true;
- continue;
- }
-
- if (!(res->start & ~PAGE_MASK)) {
- /*
- * Add a dummy resource to reserve the remainder
- * of the exclusive page in case that hot-add
- * device's bar is assigned into it.
- */
- dummy_res = kzalloc(sizeof(*dummy_res), GFP_KERNEL);
- if (dummy_res == NULL)
- goto no_mmap;
-
- dummy_res->resource.name = "vfio sub-page reserved";
- dummy_res->resource.start = res->end + 1;
- dummy_res->resource.end = res->start + PAGE_SIZE - 1;
- dummy_res->resource.flags = res->flags;
- if (request_resource(res->parent,
- &dummy_res->resource)) {
- kfree(dummy_res);
- goto no_mmap;
- }
- dummy_res->index = bar;
- list_add(&dummy_res->res_next,
- &vdev->dummy_resources_list);
- vdev->bar_mmap_supported[bar] = true;
- continue;
- }
- /*
- * Here we don't handle the case when the BAR is not page
- * aligned because we can't expect the BAR will be
- * assigned into the same location in a page in guest
- * when we passthrough the BAR. And it's hard to access
- * this BAR in userspace because we have no way to get
- * the BAR's location in a page.
- */
-no_mmap:
- vdev->bar_mmap_supported[bar] = false;
- }
-}
-
-struct vfio_pci_group_info;
-static bool vfio_pci_dev_set_try_reset(struct vfio_device_set *dev_set);
-static void vfio_pci_disable(struct vfio_pci_device *vdev);
-static int vfio_pci_dev_set_hot_reset(struct vfio_device_set *dev_set,
- struct vfio_pci_group_info *groups);
-
-/*
- * INTx masking requires the ability to disable INTx signaling via PCI_COMMAND
- * _and_ the ability detect when the device is asserting INTx via PCI_STATUS.
- * If a device implements the former but not the latter we would typically
- * expect broken_intx_masking be set and require an exclusive interrupt.
- * However since we do have control of the device's ability to assert INTx,
- * we can instead pretend that the device does not implement INTx, virtualizing
- * the pin register to report zero and maintaining DisINTx set on the host.
- */
-static bool vfio_pci_nointx(struct pci_dev *pdev)
-{
- switch (pdev->vendor) {
- case PCI_VENDOR_ID_INTEL:
- switch (pdev->device) {
- /* All i40e (XL710/X710/XXV710) 10/20/25/40GbE NICs */
- case 0x1572:
- case 0x1574:
- case 0x1580 ... 0x1581:
- case 0x1583 ... 0x158b:
- case 0x37d0 ... 0x37d2:
- /* X550 */
- case 0x1563:
- return true;
- default:
- return false;
- }
- }
-
- return false;
-}
-
-static void vfio_pci_probe_power_state(struct vfio_pci_device *vdev)
-{
- struct pci_dev *pdev = vdev->pdev;
- u16 pmcsr;
-
- if (!pdev->pm_cap)
- return;
-
- pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &pmcsr);
-
- vdev->needs_pm_restore = !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET);
-}
-
-/*
- * pci_set_power_state() wrapper handling devices which perform a soft reset on
- * D3->D0 transition. Save state prior to D0/1/2->D3, stash it on the vdev,
- * restore when returned to D0. Saved separately from pci_saved_state for use
- * by PM capability emulation and separately from pci_dev internal saved state
- * to avoid it being overwritten and consumed around other resets.
- */
-int vfio_pci_set_power_state(struct vfio_pci_device *vdev, pci_power_t state)
-{
- struct pci_dev *pdev = vdev->pdev;
- bool needs_restore = false, needs_save = false;
- int ret;
-
- if (vdev->needs_pm_restore) {
- if (pdev->current_state < PCI_D3hot && state >= PCI_D3hot) {
- pci_save_state(pdev);
- needs_save = true;
- }
-
- if (pdev->current_state >= PCI_D3hot && state <= PCI_D0)
- needs_restore = true;
- }
-
- ret = pci_set_power_state(pdev, state);
-
- if (!ret) {
- /* D3 might be unsupported via quirk, skip unless in D3 */
- if (needs_save && pdev->current_state >= PCI_D3hot) {
- vdev->pm_save = pci_store_saved_state(pdev);
- } else if (needs_restore) {
- pci_load_and_free_saved_state(pdev, &vdev->pm_save);
- pci_restore_state(pdev);
- }
- }
-
- return ret;
-}
-
-static int vfio_pci_enable(struct vfio_pci_device *vdev)
-{
- struct pci_dev *pdev = vdev->pdev;
- int ret;
- u16 cmd;
- u8 msix_pos;
-
- vfio_pci_set_power_state(vdev, PCI_D0);
-
- /* Don't allow our initial saved state to include busmaster */
- pci_clear_master(pdev);
-
- ret = pci_enable_device(pdev);
- if (ret)
- return ret;
-
- /* If reset fails because of the device lock, fail this path entirely */
- ret = pci_try_reset_function(pdev);
- if (ret == -EAGAIN) {
- pci_disable_device(pdev);
- return ret;
- }
-
- vdev->reset_works = !ret;
- pci_save_state(pdev);
- vdev->pci_saved_state = pci_store_saved_state(pdev);
- if (!vdev->pci_saved_state)
- pci_dbg(pdev, "%s: Couldn't store saved state\n", __func__);
-
- if (likely(!nointxmask)) {
- if (vfio_pci_nointx(pdev)) {
- pci_info(pdev, "Masking broken INTx support\n");
- vdev->nointx = true;
- pci_intx(pdev, 0);
- } else
- vdev->pci_2_3 = pci_intx_mask_supported(pdev);
- }
-
- pci_read_config_word(pdev, PCI_COMMAND, &cmd);
- if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) {
- cmd &= ~PCI_COMMAND_INTX_DISABLE;
- pci_write_config_word(pdev, PCI_COMMAND, cmd);
- }
-
- ret = vfio_config_init(vdev);
- if (ret) {
- kfree(vdev->pci_saved_state);
- vdev->pci_saved_state = NULL;
- pci_disable_device(pdev);
- return ret;
- }
-
- msix_pos = pdev->msix_cap;
- if (msix_pos) {
- u16 flags;
- u32 table;
-
- pci_read_config_word(pdev, msix_pos + PCI_MSIX_FLAGS, &flags);
- pci_read_config_dword(pdev, msix_pos + PCI_MSIX_TABLE, &table);
-
- vdev->msix_bar = table & PCI_MSIX_TABLE_BIR;
- vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET;
- vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16;
- } else
- vdev->msix_bar = 0xFF;
-
- if (!vfio_vga_disabled() && vfio_pci_is_vga(pdev))
- vdev->has_vga = true;
-
- if (vfio_pci_is_vga(pdev) &&
- pdev->vendor == PCI_VENDOR_ID_INTEL &&
- IS_ENABLED(CONFIG_VFIO_PCI_IGD)) {
- ret = vfio_pci_igd_init(vdev);
- if (ret && ret != -ENODEV) {
- pci_warn(pdev, "Failed to setup Intel IGD regions\n");
- goto disable_exit;
- }
- }
-
- vfio_pci_probe_mmaps(vdev);
-
- return 0;
-
-disable_exit:
- vfio_pci_disable(vdev);
- return ret;
-}
-
-static void vfio_pci_disable(struct vfio_pci_device *vdev)
-{
- struct pci_dev *pdev = vdev->pdev;
- struct vfio_pci_dummy_resource *dummy_res, *tmp;
- struct vfio_pci_ioeventfd *ioeventfd, *ioeventfd_tmp;
- int i, bar;
-
- /* For needs_reset */
- lockdep_assert_held(&vdev->vdev.dev_set->lock);
-
- /* Stop the device from further DMA */
- pci_clear_master(pdev);
-
- vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE |
- VFIO_IRQ_SET_ACTION_TRIGGER,
- vdev->irq_type, 0, 0, NULL);
-
- /* Device closed, don't need mutex here */
- list_for_each_entry_safe(ioeventfd, ioeventfd_tmp,
- &vdev->ioeventfds_list, next) {
- vfio_virqfd_disable(&ioeventfd->virqfd);
- list_del(&ioeventfd->next);
- kfree(ioeventfd);
- }
- vdev->ioeventfds_nr = 0;
-
- vdev->virq_disabled = false;
-
- for (i = 0; i < vdev->num_regions; i++)
- vdev->region[i].ops->release(vdev, &vdev->region[i]);
-
- vdev->num_regions = 0;
- kfree(vdev->region);
- vdev->region = NULL; /* don't krealloc a freed pointer */
-
- vfio_config_free(vdev);
-
- for (i = 0; i < PCI_STD_NUM_BARS; i++) {
- bar = i + PCI_STD_RESOURCES;
- if (!vdev->barmap[bar])
- continue;
- pci_iounmap(pdev, vdev->barmap[bar]);
- pci_release_selected_regions(pdev, 1 << bar);
- vdev->barmap[bar] = NULL;
- }
-
- list_for_each_entry_safe(dummy_res, tmp,
- &vdev->dummy_resources_list, res_next) {
- list_del(&dummy_res->res_next);
- release_resource(&dummy_res->resource);
- kfree(dummy_res);
- }
-
- vdev->needs_reset = true;
-
- /*
- * If we have saved state, restore it. If we can reset the device,
- * even better. Resetting with current state seems better than
- * nothing, but saving and restoring current state without reset
- * is just busy work.
- */
- if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) {
- pci_info(pdev, "%s: Couldn't reload saved state\n", __func__);
-
- if (!vdev->reset_works)
- goto out;
-
- pci_save_state(pdev);
- }
-
- /*
- * Disable INTx and MSI, presumably to avoid spurious interrupts
- * during reset. Stolen from pci_reset_function()
- */
- pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
-
- /*
- * Try to get the locks ourselves to prevent a deadlock. The
- * success of this is dependent on being able to lock the device,
- * which is not always possible.
- * We can not use the "try" reset interface here, which will
- * overwrite the previously restored configuration information.
- */
- if (vdev->reset_works && pci_dev_trylock(pdev)) {
- if (!__pci_reset_function_locked(pdev))
- vdev->needs_reset = false;
- pci_dev_unlock(pdev);
- }
-
- pci_restore_state(pdev);
-out:
- pci_disable_device(pdev);
-
- if (!vfio_pci_dev_set_try_reset(vdev->vdev.dev_set) && !disable_idle_d3)
- vfio_pci_set_power_state(vdev, PCI_D3hot);
-}
-
-static struct pci_driver vfio_pci_driver;
-
-static struct vfio_pci_device *get_pf_vdev(struct vfio_pci_device *vdev)
-{
- struct pci_dev *physfn = pci_physfn(vdev->pdev);
- struct vfio_device *pf_dev;
-
- if (!vdev->pdev->is_virtfn)
- return NULL;
-
- pf_dev = vfio_device_get_from_dev(&physfn->dev);
- if (!pf_dev)
- return NULL;
-
- if (pci_dev_driver(physfn) != &vfio_pci_driver) {
- vfio_device_put(pf_dev);
- return NULL;
- }
-
- return container_of(pf_dev, struct vfio_pci_device, vdev);
-}
-
-static void vfio_pci_vf_token_user_add(struct vfio_pci_device *vdev, int val)
-{
- struct vfio_pci_device *pf_vdev = get_pf_vdev(vdev);
-
- if (!pf_vdev)
- return;
-
- mutex_lock(&pf_vdev->vf_token->lock);
- pf_vdev->vf_token->users += val;
- WARN_ON(pf_vdev->vf_token->users < 0);
- mutex_unlock(&pf_vdev->vf_token->lock);
-
- vfio_device_put(&pf_vdev->vdev);
-}
-
-static void vfio_pci_close_device(struct vfio_device *core_vdev)
-{
- struct vfio_pci_device *vdev =
- container_of(core_vdev, struct vfio_pci_device, vdev);
-
- vfio_pci_vf_token_user_add(vdev, -1);
- vfio_spapr_pci_eeh_release(vdev->pdev);
- vfio_pci_disable(vdev);
-
- mutex_lock(&vdev->igate);
- if (vdev->err_trigger) {
- eventfd_ctx_put(vdev->err_trigger);
- vdev->err_trigger = NULL;
- }
- if (vdev->req_trigger) {
- eventfd_ctx_put(vdev->req_trigger);
- vdev->req_trigger = NULL;
- }
- mutex_unlock(&vdev->igate);
-}
-
-static int vfio_pci_open_device(struct vfio_device *core_vdev)
-{
- struct vfio_pci_device *vdev =
- container_of(core_vdev, struct vfio_pci_device, vdev);
- int ret = 0;
-
- ret = vfio_pci_enable(vdev);
- if (ret)
- return ret;
-
- vfio_spapr_pci_eeh_open(vdev->pdev);
- vfio_pci_vf_token_user_add(vdev, 1);
- return 0;
-}
-
-static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
-{
- if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) {
- u8 pin;
-
- if (!IS_ENABLED(CONFIG_VFIO_PCI_INTX) ||
- vdev->nointx || vdev->pdev->is_virtfn)
- return 0;
-
- pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
-
- return pin ? 1 : 0;
- } else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) {
- u8 pos;
- u16 flags;
-
- pos = vdev->pdev->msi_cap;
- if (pos) {
- pci_read_config_word(vdev->pdev,
- pos + PCI_MSI_FLAGS, &flags);
- return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1);
- }
- } else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) {
- u8 pos;
- u16 flags;
-
- pos = vdev->pdev->msix_cap;
- if (pos) {
- pci_read_config_word(vdev->pdev,
- pos + PCI_MSIX_FLAGS, &flags);
-
- return (flags & PCI_MSIX_FLAGS_QSIZE) + 1;
- }
- } else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX) {
- if (pci_is_pcie(vdev->pdev))
- return 1;
- } else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) {
- return 1;
- }
-
- return 0;
-}
-
-static int vfio_pci_count_devs(struct pci_dev *pdev, void *data)
-{
- (*(int *)data)++;
- return 0;
-}
-
-struct vfio_pci_fill_info {
- int max;
- int cur;
- struct vfio_pci_dependent_device *devices;
-};
-
-static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data)
-{
- struct vfio_pci_fill_info *fill = data;
- struct iommu_group *iommu_group;
-
- if (fill->cur == fill->max)
- return -EAGAIN; /* Something changed, try again */
-
- iommu_group = iommu_group_get(&pdev->dev);
- if (!iommu_group)
- return -EPERM; /* Cannot reset non-isolated devices */
-
- fill->devices[fill->cur].group_id = iommu_group_id(iommu_group);
- fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus);
- fill->devices[fill->cur].bus = pdev->bus->number;
- fill->devices[fill->cur].devfn = pdev->devfn;
- fill->cur++;
- iommu_group_put(iommu_group);
- return 0;
-}
-
-struct vfio_pci_group_info {
- int count;
- struct vfio_group **groups;
-};
-
-static bool vfio_pci_dev_below_slot(struct pci_dev *pdev, struct pci_slot *slot)
-{
- for (; pdev; pdev = pdev->bus->self)
- if (pdev->bus == slot->bus)
- return (pdev->slot == slot);
- return false;
-}
-
-struct vfio_pci_walk_info {
- int (*fn)(struct pci_dev *, void *data);
- void *data;
- struct pci_dev *pdev;
- bool slot;
- int ret;
-};
-
-static int vfio_pci_walk_wrapper(struct pci_dev *pdev, void *data)
-{
- struct vfio_pci_walk_info *walk = data;
-
- if (!walk->slot || vfio_pci_dev_below_slot(pdev, walk->pdev->slot))
- walk->ret = walk->fn(pdev, walk->data);
-
- return walk->ret;
-}
-
-static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev,
- int (*fn)(struct pci_dev *,
- void *data), void *data,
- bool slot)
-{
- struct vfio_pci_walk_info walk = {
- .fn = fn, .data = data, .pdev = pdev, .slot = slot, .ret = 0,
- };
-
- pci_walk_bus(pdev->bus, vfio_pci_walk_wrapper, &walk);
-
- return walk.ret;
-}
-
-static int msix_mmappable_cap(struct vfio_pci_device *vdev,
- struct vfio_info_cap *caps)
-{
- struct vfio_info_cap_header header = {
- .id = VFIO_REGION_INFO_CAP_MSIX_MAPPABLE,
- .version = 1
- };
-
- return vfio_info_add_capability(caps, &header, sizeof(header));
-}
-
-int vfio_pci_register_dev_region(struct vfio_pci_device *vdev,
- unsigned int type, unsigned int subtype,
- const struct vfio_pci_regops *ops,
- size_t size, u32 flags, void *data)
-{
- struct vfio_pci_region *region;
-
- region = krealloc(vdev->region,
- (vdev->num_regions + 1) * sizeof(*region),
- GFP_KERNEL);
- if (!region)
- return -ENOMEM;
-
- vdev->region = region;
- vdev->region[vdev->num_regions].type = type;
- vdev->region[vdev->num_regions].subtype = subtype;
- vdev->region[vdev->num_regions].ops = ops;
- vdev->region[vdev->num_regions].size = size;
- vdev->region[vdev->num_regions].flags = flags;
- vdev->region[vdev->num_regions].data = data;
-
- vdev->num_regions++;
-
- return 0;
-}
-
-static long vfio_pci_ioctl(struct vfio_device *core_vdev,
- unsigned int cmd, unsigned long arg)
-{
- struct vfio_pci_device *vdev =
- container_of(core_vdev, struct vfio_pci_device, vdev);
- unsigned long minsz;
-
- if (cmd == VFIO_DEVICE_GET_INFO) {
- struct vfio_device_info info;
- struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
- unsigned long capsz;
- int ret;
-
- minsz = offsetofend(struct vfio_device_info, num_irqs);
-
- /* For backward compatibility, cannot require this */
- capsz = offsetofend(struct vfio_iommu_type1_info, cap_offset);
-
- if (copy_from_user(&info, (void __user *)arg, minsz))
- return -EFAULT;
-
- if (info.argsz < minsz)
- return -EINVAL;
-
- if (info.argsz >= capsz) {
- minsz = capsz;
- info.cap_offset = 0;
- }
-
- info.flags = VFIO_DEVICE_FLAGS_PCI;
-
- if (vdev->reset_works)
- info.flags |= VFIO_DEVICE_FLAGS_RESET;
-
- info.num_regions = VFIO_PCI_NUM_REGIONS + vdev->num_regions;
- info.num_irqs = VFIO_PCI_NUM_IRQS;
-
- ret = vfio_pci_info_zdev_add_caps(vdev, &caps);
- if (ret && ret != -ENODEV) {
- pci_warn(vdev->pdev, "Failed to setup zPCI info capabilities\n");
- return ret;
- }
-
- if (caps.size) {
- info.flags |= VFIO_DEVICE_FLAGS_CAPS;
- if (info.argsz < sizeof(info) + caps.size) {
- info.argsz = sizeof(info) + caps.size;
- } else {
- vfio_info_cap_shift(&caps, sizeof(info));
- if (copy_to_user((void __user *)arg +
- sizeof(info), caps.buf,
- caps.size)) {
- kfree(caps.buf);
- return -EFAULT;
- }
- info.cap_offset = sizeof(info);
- }
-
- kfree(caps.buf);
- }
-
- return copy_to_user((void __user *)arg, &info, minsz) ?
- -EFAULT : 0;
-
- } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
- struct pci_dev *pdev = vdev->pdev;
- struct vfio_region_info info;
- struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
- int i, ret;
-
- minsz = offsetofend(struct vfio_region_info, offset);
-
- if (copy_from_user(&info, (void __user *)arg, minsz))
- return -EFAULT;
-
- if (info.argsz < minsz)
- return -EINVAL;
-
- switch (info.index) {
- case VFIO_PCI_CONFIG_REGION_INDEX:
- info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
- info.size = pdev->cfg_size;
- info.flags = VFIO_REGION_INFO_FLAG_READ |
- VFIO_REGION_INFO_FLAG_WRITE;
- break;
- case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
- info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
- info.size = pci_resource_len(pdev, info.index);
- if (!info.size) {
- info.flags = 0;
- break;
- }
-
- info.flags = VFIO_REGION_INFO_FLAG_READ |
- VFIO_REGION_INFO_FLAG_WRITE;
- if (vdev->bar_mmap_supported[info.index]) {
- info.flags |= VFIO_REGION_INFO_FLAG_MMAP;
- if (info.index == vdev->msix_bar) {
- ret = msix_mmappable_cap(vdev, &caps);
- if (ret)
- return ret;
- }
- }
-
- break;
- case VFIO_PCI_ROM_REGION_INDEX:
- {
- void __iomem *io;
- size_t size;
- u16 cmd;
-
- info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
- info.flags = 0;
-
- /* Report the BAR size, not the ROM size */
- info.size = pci_resource_len(pdev, info.index);
- if (!info.size) {
- /* Shadow ROMs appear as PCI option ROMs */
- if (pdev->resource[PCI_ROM_RESOURCE].flags &
- IORESOURCE_ROM_SHADOW)
- info.size = 0x20000;
- else
- break;
- }
-
- /*
- * Is it really there? Enable memory decode for
- * implicit access in pci_map_rom().
- */
- cmd = vfio_pci_memory_lock_and_enable(vdev);
- io = pci_map_rom(pdev, &size);
- if (io) {
- info.flags = VFIO_REGION_INFO_FLAG_READ;
- pci_unmap_rom(pdev, io);
- } else {
- info.size = 0;
- }
- vfio_pci_memory_unlock_and_restore(vdev, cmd);
-
- break;
- }
- case VFIO_PCI_VGA_REGION_INDEX:
- if (!vdev->has_vga)
- return -EINVAL;
-
- info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
- info.size = 0xc0000;
- info.flags = VFIO_REGION_INFO_FLAG_READ |
- VFIO_REGION_INFO_FLAG_WRITE;
-
- break;
- default:
- {
- struct vfio_region_info_cap_type cap_type = {
- .header.id = VFIO_REGION_INFO_CAP_TYPE,
- .header.version = 1 };
-
- if (info.index >=
- VFIO_PCI_NUM_REGIONS + vdev->num_regions)
- return -EINVAL;
- info.index = array_index_nospec(info.index,
- VFIO_PCI_NUM_REGIONS +
- vdev->num_regions);
-
- i = info.index - VFIO_PCI_NUM_REGIONS;
-
- info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
- info.size = vdev->region[i].size;
- info.flags = vdev->region[i].flags;
-
- cap_type.type = vdev->region[i].type;
- cap_type.subtype = vdev->region[i].subtype;
-
- ret = vfio_info_add_capability(&caps, &cap_type.header,
- sizeof(cap_type));
- if (ret)
- return ret;
-
- if (vdev->region[i].ops->add_capability) {
- ret = vdev->region[i].ops->add_capability(vdev,
- &vdev->region[i], &caps);
- if (ret)
- return ret;
- }
- }
- }
-
- if (caps.size) {
- info.flags |= VFIO_REGION_INFO_FLAG_CAPS;
- if (info.argsz < sizeof(info) + caps.size) {
- info.argsz = sizeof(info) + caps.size;
- info.cap_offset = 0;
- } else {
- vfio_info_cap_shift(&caps, sizeof(info));
- if (copy_to_user((void __user *)arg +
- sizeof(info), caps.buf,
- caps.size)) {
- kfree(caps.buf);
- return -EFAULT;
- }
- info.cap_offset = sizeof(info);
- }
-
- kfree(caps.buf);
- }
-
- return copy_to_user((void __user *)arg, &info, minsz) ?
- -EFAULT : 0;
-
- } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
- struct vfio_irq_info info;
-
- minsz = offsetofend(struct vfio_irq_info, count);
-
- if (copy_from_user(&info, (void __user *)arg, minsz))
- return -EFAULT;
-
- if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS)
- return -EINVAL;
-
- switch (info.index) {
- case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX:
- case VFIO_PCI_REQ_IRQ_INDEX:
- break;
- case VFIO_PCI_ERR_IRQ_INDEX:
- if (pci_is_pcie(vdev->pdev))
- break;
- fallthrough;
- default:
- return -EINVAL;
- }
-
- info.flags = VFIO_IRQ_INFO_EVENTFD;
-
- info.count = vfio_pci_get_irq_count(vdev, info.index);
-
- if (info.index == VFIO_PCI_INTX_IRQ_INDEX)
- info.flags |= (VFIO_IRQ_INFO_MASKABLE |
- VFIO_IRQ_INFO_AUTOMASKED);
- else
- info.flags |= VFIO_IRQ_INFO_NORESIZE;
-
- return copy_to_user((void __user *)arg, &info, minsz) ?
- -EFAULT : 0;
-
- } else if (cmd == VFIO_DEVICE_SET_IRQS) {
- struct vfio_irq_set hdr;
- u8 *data = NULL;
- int max, ret = 0;
- size_t data_size = 0;
-
- minsz = offsetofend(struct vfio_irq_set, count);
-
- if (copy_from_user(&hdr, (void __user *)arg, minsz))
- return -EFAULT;
-
- max = vfio_pci_get_irq_count(vdev, hdr.index);
-
- ret = vfio_set_irqs_validate_and_prepare(&hdr, max,
- VFIO_PCI_NUM_IRQS, &data_size);
- if (ret)
- return ret;
-
- if (data_size) {
- data = memdup_user((void __user *)(arg + minsz),
- data_size);
- if (IS_ERR(data))
- return PTR_ERR(data);
- }
-
- mutex_lock(&vdev->igate);
-
- ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
- hdr.start, hdr.count, data);
-
- mutex_unlock(&vdev->igate);
- kfree(data);
-
- return ret;
-
- } else if (cmd == VFIO_DEVICE_RESET) {
- int ret;
-
- if (!vdev->reset_works)
- return -EINVAL;
-
- vfio_pci_zap_and_down_write_memory_lock(vdev);
- ret = pci_try_reset_function(vdev->pdev);
- up_write(&vdev->memory_lock);
-
- return ret;
-
- } else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) {
- struct vfio_pci_hot_reset_info hdr;
- struct vfio_pci_fill_info fill = { 0 };
- struct vfio_pci_dependent_device *devices = NULL;
- bool slot = false;
- int ret = 0;
-
- minsz = offsetofend(struct vfio_pci_hot_reset_info, count);
-
- if (copy_from_user(&hdr, (void __user *)arg, minsz))
- return -EFAULT;
-
- if (hdr.argsz < minsz)
- return -EINVAL;
-
- hdr.flags = 0;
-
- /* Can we do a slot or bus reset or neither? */
- if (!pci_probe_reset_slot(vdev->pdev->slot))
- slot = true;
- else if (pci_probe_reset_bus(vdev->pdev->bus))
- return -ENODEV;
-
- /* How many devices are affected? */
- ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
- vfio_pci_count_devs,
- &fill.max, slot);
- if (ret)
- return ret;
-
- WARN_ON(!fill.max); /* Should always be at least one */
-
- /*
- * If there's enough space, fill it now, otherwise return
- * -ENOSPC and the number of devices affected.
- */
- if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) {
- ret = -ENOSPC;
- hdr.count = fill.max;
- goto reset_info_exit;
- }
-
- devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL);
- if (!devices)
- return -ENOMEM;
-
- fill.devices = devices;
-
- ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
- vfio_pci_fill_devs,
- &fill, slot);
-
- /*
- * If a device was removed between counting and filling,
- * we may come up short of fill.max. If a device was
- * added, we'll have a return of -EAGAIN above.
- */
- if (!ret)
- hdr.count = fill.cur;
-
-reset_info_exit:
- if (copy_to_user((void __user *)arg, &hdr, minsz))
- ret = -EFAULT;
-
- if (!ret) {
- if (copy_to_user((void __user *)(arg + minsz), devices,
- hdr.count * sizeof(*devices)))
- ret = -EFAULT;
- }
-
- kfree(devices);
- return ret;
-
- } else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) {
- struct vfio_pci_hot_reset hdr;
- int32_t *group_fds;
- struct vfio_group **groups;
- struct vfio_pci_group_info info;
- bool slot = false;
- int group_idx, count = 0, ret = 0;
-
- minsz = offsetofend(struct vfio_pci_hot_reset, count);
-
- if (copy_from_user(&hdr, (void __user *)arg, minsz))
- return -EFAULT;
-
- if (hdr.argsz < minsz || hdr.flags)
- return -EINVAL;
-
- /* Can we do a slot or bus reset or neither? */
- if (!pci_probe_reset_slot(vdev->pdev->slot))
- slot = true;
- else if (pci_probe_reset_bus(vdev->pdev->bus))
- return -ENODEV;
-
- /*
- * We can't let userspace give us an arbitrarily large
- * buffer to copy, so verify how many we think there
- * could be. Note groups can have multiple devices so
- * one group per device is the max.
- */
- ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
- vfio_pci_count_devs,
- &count, slot);
- if (ret)
- return ret;
-
- /* Somewhere between 1 and count is OK */
- if (!hdr.count || hdr.count > count)
- return -EINVAL;
-
- group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL);
- groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL);
- if (!group_fds || !groups) {
- kfree(group_fds);
- kfree(groups);
- return -ENOMEM;
- }
-
- if (copy_from_user(group_fds, (void __user *)(arg + minsz),
- hdr.count * sizeof(*group_fds))) {
- kfree(group_fds);
- kfree(groups);
- return -EFAULT;
- }
-
- /*
- * For each group_fd, get the group through the vfio external
- * user interface and store the group and iommu ID. This
- * ensures the group is held across the reset.
- */
- for (group_idx = 0; group_idx < hdr.count; group_idx++) {
- struct vfio_group *group;
- struct fd f = fdget(group_fds[group_idx]);
- if (!f.file) {
- ret = -EBADF;
- break;
- }
-
- group = vfio_group_get_external_user(f.file);
- fdput(f);
- if (IS_ERR(group)) {
- ret = PTR_ERR(group);
- break;
- }
-
- groups[group_idx] = group;
- }
-
- kfree(group_fds);
-
- /* release reference to groups on error */
- if (ret)
- goto hot_reset_release;
-
- info.count = hdr.count;
- info.groups = groups;
-
- ret = vfio_pci_dev_set_hot_reset(vdev->vdev.dev_set, &info);
-
-hot_reset_release:
- for (group_idx--; group_idx >= 0; group_idx--)
- vfio_group_put_external_user(groups[group_idx]);
-
- kfree(groups);
- return ret;
- } else if (cmd == VFIO_DEVICE_IOEVENTFD) {
- struct vfio_device_ioeventfd ioeventfd;
- int count;
-
- minsz = offsetofend(struct vfio_device_ioeventfd, fd);
-
- if (copy_from_user(&ioeventfd, (void __user *)arg, minsz))
- return -EFAULT;
-
- if (ioeventfd.argsz < minsz)
- return -EINVAL;
-
- if (ioeventfd.flags & ~VFIO_DEVICE_IOEVENTFD_SIZE_MASK)
- return -EINVAL;
-
- count = ioeventfd.flags & VFIO_DEVICE_IOEVENTFD_SIZE_MASK;
-
- if (hweight8(count) != 1 || ioeventfd.fd < -1)
- return -EINVAL;
-
- return vfio_pci_ioeventfd(vdev, ioeventfd.offset,
- ioeventfd.data, count, ioeventfd.fd);
- } else if (cmd == VFIO_DEVICE_FEATURE) {
- struct vfio_device_feature feature;
- uuid_t uuid;
-
- minsz = offsetofend(struct vfio_device_feature, flags);
-
- if (copy_from_user(&feature, (void __user *)arg, minsz))
- return -EFAULT;
-
- if (feature.argsz < minsz)
- return -EINVAL;
-
- /* Check unknown flags */
- if (feature.flags & ~(VFIO_DEVICE_FEATURE_MASK |
- VFIO_DEVICE_FEATURE_SET |
- VFIO_DEVICE_FEATURE_GET |
- VFIO_DEVICE_FEATURE_PROBE))
- return -EINVAL;
-
- /* GET & SET are mutually exclusive except with PROBE */
- if (!(feature.flags & VFIO_DEVICE_FEATURE_PROBE) &&
- (feature.flags & VFIO_DEVICE_FEATURE_SET) &&
- (feature.flags & VFIO_DEVICE_FEATURE_GET))
- return -EINVAL;
-
- switch (feature.flags & VFIO_DEVICE_FEATURE_MASK) {
- case VFIO_DEVICE_FEATURE_PCI_VF_TOKEN:
- if (!vdev->vf_token)
- return -ENOTTY;
-
- /*
- * We do not support GET of the VF Token UUID as this
- * could expose the token of the previous device user.
- */
- if (feature.flags & VFIO_DEVICE_FEATURE_GET)
- return -EINVAL;
-
- if (feature.flags & VFIO_DEVICE_FEATURE_PROBE)
- return 0;
-
- /* Don't SET unless told to do so */
- if (!(feature.flags & VFIO_DEVICE_FEATURE_SET))
- return -EINVAL;
-
- if (feature.argsz < minsz + sizeof(uuid))
- return -EINVAL;
-
- if (copy_from_user(&uuid, (void __user *)(arg + minsz),
- sizeof(uuid)))
- return -EFAULT;
-
- mutex_lock(&vdev->vf_token->lock);
- uuid_copy(&vdev->vf_token->uuid, &uuid);
- mutex_unlock(&vdev->vf_token->lock);
-
- return 0;
- default:
- return -ENOTTY;
- }
- }
-
- return -ENOTTY;
-}
-
-static ssize_t vfio_pci_rw(struct vfio_pci_device *vdev, char __user *buf,
- size_t count, loff_t *ppos, bool iswrite)
-{
- unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
-
- if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions)
- return -EINVAL;
-
- switch (index) {
- case VFIO_PCI_CONFIG_REGION_INDEX:
- return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite);
-
- case VFIO_PCI_ROM_REGION_INDEX:
- if (iswrite)
- return -EINVAL;
- return vfio_pci_bar_rw(vdev, buf, count, ppos, false);
-
- case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
- return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite);
-
- case VFIO_PCI_VGA_REGION_INDEX:
- return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite);
- default:
- index -= VFIO_PCI_NUM_REGIONS;
- return vdev->region[index].ops->rw(vdev, buf,
- count, ppos, iswrite);
- }
-
- return -EINVAL;
-}
-
-static ssize_t vfio_pci_read(struct vfio_device *core_vdev, char __user *buf,
- size_t count, loff_t *ppos)
-{
- struct vfio_pci_device *vdev =
- container_of(core_vdev, struct vfio_pci_device, vdev);
-
- if (!count)
- return 0;
-
- return vfio_pci_rw(vdev, buf, count, ppos, false);
-}
-
-static ssize_t vfio_pci_write(struct vfio_device *core_vdev, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- struct vfio_pci_device *vdev =
- container_of(core_vdev, struct vfio_pci_device, vdev);
-
- if (!count)
- return 0;
-
- return vfio_pci_rw(vdev, (char __user *)buf, count, ppos, true);
-}
-
-/* Return 1 on zap and vma_lock acquired, 0 on contention (only with @try) */
-static int vfio_pci_zap_and_vma_lock(struct vfio_pci_device *vdev, bool try)
-{
- struct vfio_pci_mmap_vma *mmap_vma, *tmp;
-
- /*
- * Lock ordering:
- * vma_lock is nested under mmap_lock for vm_ops callback paths.
- * The memory_lock semaphore is used by both code paths calling
- * into this function to zap vmas and the vm_ops.fault callback
- * to protect the memory enable state of the device.
- *
- * When zapping vmas we need to maintain the mmap_lock => vma_lock
- * ordering, which requires using vma_lock to walk vma_list to
- * acquire an mm, then dropping vma_lock to get the mmap_lock and
- * reacquiring vma_lock. This logic is derived from similar
- * requirements in uverbs_user_mmap_disassociate().
- *
- * mmap_lock must always be the top-level lock when it is taken.
- * Therefore we can only hold the memory_lock write lock when
- * vma_list is empty, as we'd need to take mmap_lock to clear
- * entries. vma_list can only be guaranteed empty when holding
- * vma_lock, thus memory_lock is nested under vma_lock.
- *
- * This enables the vm_ops.fault callback to acquire vma_lock,
- * followed by memory_lock read lock, while already holding
- * mmap_lock without risk of deadlock.
- */
- while (1) {
- struct mm_struct *mm = NULL;
-
- if (try) {
- if (!mutex_trylock(&vdev->vma_lock))
- return 0;
- } else {
- mutex_lock(&vdev->vma_lock);
- }
- while (!list_empty(&vdev->vma_list)) {
- mmap_vma = list_first_entry(&vdev->vma_list,
- struct vfio_pci_mmap_vma,
- vma_next);
- mm = mmap_vma->vma->vm_mm;
- if (mmget_not_zero(mm))
- break;
-
- list_del(&mmap_vma->vma_next);
- kfree(mmap_vma);
- mm = NULL;
- }
- if (!mm)
- return 1;
- mutex_unlock(&vdev->vma_lock);
-
- if (try) {
- if (!mmap_read_trylock(mm)) {
- mmput(mm);
- return 0;
- }
- } else {
- mmap_read_lock(mm);
- }
- if (try) {
- if (!mutex_trylock(&vdev->vma_lock)) {
- mmap_read_unlock(mm);
- mmput(mm);
- return 0;
- }
- } else {
- mutex_lock(&vdev->vma_lock);
- }
- list_for_each_entry_safe(mmap_vma, tmp,
- &vdev->vma_list, vma_next) {
- struct vm_area_struct *vma = mmap_vma->vma;
-
- if (vma->vm_mm != mm)
- continue;
-
- list_del(&mmap_vma->vma_next);
- kfree(mmap_vma);
-
- zap_vma_ptes(vma, vma->vm_start,
- vma->vm_end - vma->vm_start);
- }
- mutex_unlock(&vdev->vma_lock);
- mmap_read_unlock(mm);
- mmput(mm);
- }
-}
-
-void vfio_pci_zap_and_down_write_memory_lock(struct vfio_pci_device *vdev)
-{
- vfio_pci_zap_and_vma_lock(vdev, false);
- down_write(&vdev->memory_lock);
- mutex_unlock(&vdev->vma_lock);
-}
-
-u16 vfio_pci_memory_lock_and_enable(struct vfio_pci_device *vdev)
-{
- u16 cmd;
-
- down_write(&vdev->memory_lock);
- pci_read_config_word(vdev->pdev, PCI_COMMAND, &cmd);
- if (!(cmd & PCI_COMMAND_MEMORY))
- pci_write_config_word(vdev->pdev, PCI_COMMAND,
- cmd | PCI_COMMAND_MEMORY);
-
- return cmd;
-}
-
-void vfio_pci_memory_unlock_and_restore(struct vfio_pci_device *vdev, u16 cmd)
-{
- pci_write_config_word(vdev->pdev, PCI_COMMAND, cmd);
- up_write(&vdev->memory_lock);
-}
-
-/* Caller holds vma_lock */
-static int __vfio_pci_add_vma(struct vfio_pci_device *vdev,
- struct vm_area_struct *vma)
-{
- struct vfio_pci_mmap_vma *mmap_vma;
-
- mmap_vma = kmalloc(sizeof(*mmap_vma), GFP_KERNEL);
- if (!mmap_vma)
- return -ENOMEM;
-
- mmap_vma->vma = vma;
- list_add(&mmap_vma->vma_next, &vdev->vma_list);
-
- return 0;
-}
-
-/*
- * Zap mmaps on open so that we can fault them in on access and therefore
- * our vma_list only tracks mappings accessed since last zap.
- */
-static void vfio_pci_mmap_open(struct vm_area_struct *vma)
-{
- zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
-}
-
-static void vfio_pci_mmap_close(struct vm_area_struct *vma)
-{
- struct vfio_pci_device *vdev = vma->vm_private_data;
- struct vfio_pci_mmap_vma *mmap_vma;
-
- mutex_lock(&vdev->vma_lock);
- list_for_each_entry(mmap_vma, &vdev->vma_list, vma_next) {
- if (mmap_vma->vma == vma) {
- list_del(&mmap_vma->vma_next);
- kfree(mmap_vma);
- break;
- }
- }
- mutex_unlock(&vdev->vma_lock);
-}
-
-static vm_fault_t vfio_pci_mmap_fault(struct vm_fault *vmf)
-{
- struct vm_area_struct *vma = vmf->vma;
- struct vfio_pci_device *vdev = vma->vm_private_data;
- struct vfio_pci_mmap_vma *mmap_vma;
- vm_fault_t ret = VM_FAULT_NOPAGE;
-
- mutex_lock(&vdev->vma_lock);
- down_read(&vdev->memory_lock);
-
- if (!__vfio_pci_memory_enabled(vdev)) {
- ret = VM_FAULT_SIGBUS;
- goto up_out;
- }
-
- /*
- * We populate the whole vma on fault, so we need to test whether
- * the vma has already been mapped, such as for concurrent faults
- * to the same vma. io_remap_pfn_range() will trigger a BUG_ON if
- * we ask it to fill the same range again.
- */
- list_for_each_entry(mmap_vma, &vdev->vma_list, vma_next) {
- if (mmap_vma->vma == vma)
- goto up_out;
- }
-
- if (io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
- vma->vm_end - vma->vm_start,
- vma->vm_page_prot)) {
- ret = VM_FAULT_SIGBUS;
- zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
- goto up_out;
- }
-
- if (__vfio_pci_add_vma(vdev, vma)) {
- ret = VM_FAULT_OOM;
- zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
- }
-
-up_out:
- up_read(&vdev->memory_lock);
- mutex_unlock(&vdev->vma_lock);
- return ret;
-}
-
-static const struct vm_operations_struct vfio_pci_mmap_ops = {
- .open = vfio_pci_mmap_open,
- .close = vfio_pci_mmap_close,
- .fault = vfio_pci_mmap_fault,
-};
-
-static int vfio_pci_mmap(struct vfio_device *core_vdev, struct vm_area_struct *vma)
-{
- struct vfio_pci_device *vdev =
- container_of(core_vdev, struct vfio_pci_device, vdev);
- struct pci_dev *pdev = vdev->pdev;
- unsigned int index;
- u64 phys_len, req_len, pgoff, req_start;
- int ret;
-
- index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
-
- if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions)
- return -EINVAL;
- if (vma->vm_end < vma->vm_start)
- return -EINVAL;
- if ((vma->vm_flags & VM_SHARED) == 0)
- return -EINVAL;
- if (index >= VFIO_PCI_NUM_REGIONS) {
- int regnum = index - VFIO_PCI_NUM_REGIONS;
- struct vfio_pci_region *region = vdev->region + regnum;
-
- if (region->ops && region->ops->mmap &&
- (region->flags & VFIO_REGION_INFO_FLAG_MMAP))
- return region->ops->mmap(vdev, region, vma);
- return -EINVAL;
- }
- if (index >= VFIO_PCI_ROM_REGION_INDEX)
- return -EINVAL;
- if (!vdev->bar_mmap_supported[index])
- return -EINVAL;
-
- phys_len = PAGE_ALIGN(pci_resource_len(pdev, index));
- req_len = vma->vm_end - vma->vm_start;
- pgoff = vma->vm_pgoff &
- ((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
- req_start = pgoff << PAGE_SHIFT;
-
- if (req_start + req_len > phys_len)
- return -EINVAL;
-
- /*
- * Even though we don't make use of the barmap for the mmap,
- * we need to request the region and the barmap tracks that.
- */
- if (!vdev->barmap[index]) {
- ret = pci_request_selected_regions(pdev,
- 1 << index, "vfio-pci");
- if (ret)
- return ret;
-
- vdev->barmap[index] = pci_iomap(pdev, index, 0);
- if (!vdev->barmap[index]) {
- pci_release_selected_regions(pdev, 1 << index);
- return -ENOMEM;
- }
- }
-
- vma->vm_private_data = vdev;
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
- vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff;
-
- /*
- * See remap_pfn_range(), called from vfio_pci_fault() but we can't
- * change vm_flags within the fault handler. Set them now.
- */
- vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
- vma->vm_ops = &vfio_pci_mmap_ops;
-
- return 0;
-}
-
-static void vfio_pci_request(struct vfio_device *core_vdev, unsigned int count)
-{
- struct vfio_pci_device *vdev =
- container_of(core_vdev, struct vfio_pci_device, vdev);
- struct pci_dev *pdev = vdev->pdev;
-
- mutex_lock(&vdev->igate);
-
- if (vdev->req_trigger) {
- if (!(count % 10))
- pci_notice_ratelimited(pdev,
- "Relaying device request to user (#%u)\n",
- count);
- eventfd_signal(vdev->req_trigger, 1);
- } else if (count == 0) {
- pci_warn(pdev,
- "No device request channel registered, blocked until released by user\n");
- }
-
- mutex_unlock(&vdev->igate);
-}
-
-static int vfio_pci_validate_vf_token(struct vfio_pci_device *vdev,
- bool vf_token, uuid_t *uuid)
-{
- /*
- * There's always some degree of trust or collaboration between SR-IOV
- * PF and VFs, even if just that the PF hosts the SR-IOV capability and
- * can disrupt VFs with a reset, but often the PF has more explicit
- * access to deny service to the VF or access data passed through the
- * VF. We therefore require an opt-in via a shared VF token (UUID) to
- * represent this trust. This both prevents that a VF driver might
- * assume the PF driver is a trusted, in-kernel driver, and also that
- * a PF driver might be replaced with a rogue driver, unknown to in-use
- * VF drivers.
- *
- * Therefore when presented with a VF, if the PF is a vfio device and
- * it is bound to the vfio-pci driver, the user needs to provide a VF
- * token to access the device, in the form of appending a vf_token to
- * the device name, for example:
- *
- * "0000:04:10.0 vf_token=bd8d9d2b-5a5f-4f5a-a211-f591514ba1f3"
- *
- * When presented with a PF which has VFs in use, the user must also
- * provide the current VF token to prove collaboration with existing
- * VF users. If VFs are not in use, the VF token provided for the PF
- * device will act to set the VF token.
- *
- * If the VF token is provided but unused, an error is generated.
- */
- if (!vdev->pdev->is_virtfn && !vdev->vf_token && !vf_token)
- return 0; /* No VF token provided or required */
-
- if (vdev->pdev->is_virtfn) {
- struct vfio_pci_device *pf_vdev = get_pf_vdev(vdev);
- bool match;
-
- if (!pf_vdev) {
- if (!vf_token)
- return 0; /* PF is not vfio-pci, no VF token */
-
- pci_info_ratelimited(vdev->pdev,
- "VF token incorrectly provided, PF not bound to vfio-pci\n");
- return -EINVAL;
- }
-
- if (!vf_token) {
- vfio_device_put(&pf_vdev->vdev);
- pci_info_ratelimited(vdev->pdev,
- "VF token required to access device\n");
- return -EACCES;
- }
-
- mutex_lock(&pf_vdev->vf_token->lock);
- match = uuid_equal(uuid, &pf_vdev->vf_token->uuid);
- mutex_unlock(&pf_vdev->vf_token->lock);
-
- vfio_device_put(&pf_vdev->vdev);
-
- if (!match) {
- pci_info_ratelimited(vdev->pdev,
- "Incorrect VF token provided for device\n");
- return -EACCES;
- }
- } else if (vdev->vf_token) {
- mutex_lock(&vdev->vf_token->lock);
- if (vdev->vf_token->users) {
- if (!vf_token) {
- mutex_unlock(&vdev->vf_token->lock);
- pci_info_ratelimited(vdev->pdev,
- "VF token required to access device\n");
- return -EACCES;
- }
-
- if (!uuid_equal(uuid, &vdev->vf_token->uuid)) {
- mutex_unlock(&vdev->vf_token->lock);
- pci_info_ratelimited(vdev->pdev,
- "Incorrect VF token provided for device\n");
- return -EACCES;
- }
- } else if (vf_token) {
- uuid_copy(&vdev->vf_token->uuid, uuid);
- }
-
- mutex_unlock(&vdev->vf_token->lock);
- } else if (vf_token) {
- pci_info_ratelimited(vdev->pdev,
- "VF token incorrectly provided, not a PF or VF\n");
- return -EINVAL;
- }
-
- return 0;
-}
-
-#define VF_TOKEN_ARG "vf_token="
-
-static int vfio_pci_match(struct vfio_device *core_vdev, char *buf)
-{
- struct vfio_pci_device *vdev =
- container_of(core_vdev, struct vfio_pci_device, vdev);
- bool vf_token = false;
- uuid_t uuid;
- int ret;
-
- if (strncmp(pci_name(vdev->pdev), buf, strlen(pci_name(vdev->pdev))))
- return 0; /* No match */
-
- if (strlen(buf) > strlen(pci_name(vdev->pdev))) {
- buf += strlen(pci_name(vdev->pdev));
-
- if (*buf != ' ')
- return 0; /* No match: non-whitespace after name */
-
- while (*buf) {
- if (*buf == ' ') {
- buf++;
- continue;
- }
-
- if (!vf_token && !strncmp(buf, VF_TOKEN_ARG,
- strlen(VF_TOKEN_ARG))) {
- buf += strlen(VF_TOKEN_ARG);
-
- if (strlen(buf) < UUID_STRING_LEN)
- return -EINVAL;
-
- ret = uuid_parse(buf, &uuid);
- if (ret)
- return ret;
-
- vf_token = true;
- buf += UUID_STRING_LEN;
- } else {
- /* Unknown/duplicate option */
- return -EINVAL;
- }
- }
- }
-
- ret = vfio_pci_validate_vf_token(vdev, vf_token, &uuid);
- if (ret)
- return ret;
-
- return 1; /* Match */
-}
-
-static const struct vfio_device_ops vfio_pci_ops = {
- .name = "vfio-pci",
- .open_device = vfio_pci_open_device,
- .close_device = vfio_pci_close_device,
- .ioctl = vfio_pci_ioctl,
- .read = vfio_pci_read,
- .write = vfio_pci_write,
- .mmap = vfio_pci_mmap,
- .request = vfio_pci_request,
- .match = vfio_pci_match,
-};
-
-static int vfio_pci_bus_notifier(struct notifier_block *nb,
- unsigned long action, void *data)
-{
- struct vfio_pci_device *vdev = container_of(nb,
- struct vfio_pci_device, nb);
- struct device *dev = data;
- struct pci_dev *pdev = to_pci_dev(dev);
- struct pci_dev *physfn = pci_physfn(pdev);
-
- if (action == BUS_NOTIFY_ADD_DEVICE &&
- pdev->is_virtfn && physfn == vdev->pdev) {
- pci_info(vdev->pdev, "Captured SR-IOV VF %s driver_override\n",
- pci_name(pdev));
- pdev->driver_override = kasprintf(GFP_KERNEL, "%s",
- vfio_pci_ops.name);
- } else if (action == BUS_NOTIFY_BOUND_DRIVER &&
- pdev->is_virtfn && physfn == vdev->pdev) {
- struct pci_driver *drv = pci_dev_driver(pdev);
-
- if (drv && drv != &vfio_pci_driver)
- pci_warn(vdev->pdev,
- "VF %s bound to driver %s while PF bound to vfio-pci\n",
- pci_name(pdev), drv->name);
- }
-
- return 0;
-}
-
-static int vfio_pci_vf_init(struct vfio_pci_device *vdev)
-{
- struct pci_dev *pdev = vdev->pdev;
- int ret;
-
- if (!pdev->is_physfn)
- return 0;
-
- vdev->vf_token = kzalloc(sizeof(*vdev->vf_token), GFP_KERNEL);
- if (!vdev->vf_token)
- return -ENOMEM;
-
- mutex_init(&vdev->vf_token->lock);
- uuid_gen(&vdev->vf_token->uuid);
-
- vdev->nb.notifier_call = vfio_pci_bus_notifier;
- ret = bus_register_notifier(&pci_bus_type, &vdev->nb);
- if (ret) {
- kfree(vdev->vf_token);
- return ret;
- }
- return 0;
-}
-
-static void vfio_pci_vf_uninit(struct vfio_pci_device *vdev)
-{
- if (!vdev->vf_token)
- return;
-
- bus_unregister_notifier(&pci_bus_type, &vdev->nb);
- WARN_ON(vdev->vf_token->users);
- mutex_destroy(&vdev->vf_token->lock);
- kfree(vdev->vf_token);
-}
-
-static int vfio_pci_vga_init(struct vfio_pci_device *vdev)
-{
- struct pci_dev *pdev = vdev->pdev;
- int ret;
-
- if (!vfio_pci_is_vga(pdev))
- return 0;
-
- ret = vga_client_register(pdev, vfio_pci_set_decode);
- if (ret)
- return ret;
- vga_set_legacy_decoding(pdev, vfio_pci_set_decode(pdev, false));
- return 0;
-}
-
-static void vfio_pci_vga_uninit(struct vfio_pci_device *vdev)
-{
- struct pci_dev *pdev = vdev->pdev;
-
- if (!vfio_pci_is_vga(pdev))
- return;
- vga_client_register(pdev, NULL);
- vga_set_legacy_decoding(pdev, VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
- VGA_RSRC_LEGACY_IO |
- VGA_RSRC_LEGACY_MEM);
-}
-
-static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
-{
- struct vfio_pci_device *vdev;
- struct iommu_group *group;
- int ret;
-
- if (vfio_pci_is_denylisted(pdev))
- return -EINVAL;
-
- if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL)
- return -EINVAL;
-
- /*
- * Prevent binding to PFs with VFs enabled, the VFs might be in use
- * by the host or other users. We cannot capture the VFs if they
- * already exist, nor can we track VF users. Disabling SR-IOV here
- * would initiate removing the VFs, which would unbind the driver,
- * which is prone to blocking if that VF is also in use by vfio-pci.
- * Just reject these PFs and let the user sort it out.
- */
- if (pci_num_vf(pdev)) {
- pci_warn(pdev, "Cannot bind to PF with SR-IOV enabled\n");
- return -EBUSY;
- }
-
- group = vfio_iommu_group_get(&pdev->dev);
- if (!group)
- return -EINVAL;
-
- vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
- if (!vdev) {
- ret = -ENOMEM;
- goto out_group_put;
- }
-
- vfio_init_group_dev(&vdev->vdev, &pdev->dev, &vfio_pci_ops);
- vdev->pdev = pdev;
- vdev->irq_type = VFIO_PCI_NUM_IRQS;
- mutex_init(&vdev->igate);
- spin_lock_init(&vdev->irqlock);
- mutex_init(&vdev->ioeventfds_lock);
- INIT_LIST_HEAD(&vdev->dummy_resources_list);
- INIT_LIST_HEAD(&vdev->ioeventfds_list);
- mutex_init(&vdev->vma_lock);
- INIT_LIST_HEAD(&vdev->vma_list);
- init_rwsem(&vdev->memory_lock);
-
- if (pci_is_root_bus(pdev->bus)) {
- ret = vfio_assign_device_set(&vdev->vdev, vdev);
- } else if (!pci_probe_reset_slot(pdev->slot)) {
- ret = vfio_assign_device_set(&vdev->vdev, pdev->slot);
- } else {
- /*
- * If there is no slot reset support for this device, the whole
- * bus needs to be grouped together to support bus-wide resets.
- */
- ret = vfio_assign_device_set(&vdev->vdev, pdev->bus);
- }
-
- if (ret)
- goto out_uninit;
- ret = vfio_pci_vf_init(vdev);
- if (ret)
- goto out_uninit;
- ret = vfio_pci_vga_init(vdev);
- if (ret)
- goto out_vf;
-
- vfio_pci_probe_power_state(vdev);
-
- if (!disable_idle_d3) {
- /*
- * pci-core sets the device power state to an unknown value at
- * bootup and after being removed from a driver. The only
- * transition it allows from this unknown state is to D0, which
- * typically happens when a driver calls pci_enable_device().
- * We're not ready to enable the device yet, but we do want to
- * be able to get to D3. Therefore first do a D0 transition
- * before going to D3.
- */
- vfio_pci_set_power_state(vdev, PCI_D0);
- vfio_pci_set_power_state(vdev, PCI_D3hot);
- }
-
- ret = vfio_register_group_dev(&vdev->vdev);
- if (ret)
- goto out_power;
- dev_set_drvdata(&pdev->dev, vdev);
- return 0;
-
-out_power:
- if (!disable_idle_d3)
- vfio_pci_set_power_state(vdev, PCI_D0);
-out_vf:
- vfio_pci_vf_uninit(vdev);
-out_uninit:
- vfio_uninit_group_dev(&vdev->vdev);
- kfree(vdev->pm_save);
- kfree(vdev);
-out_group_put:
- vfio_iommu_group_put(group, &pdev->dev);
- return ret;
-}
-
-static void vfio_pci_remove(struct pci_dev *pdev)
-{
- struct vfio_pci_device *vdev = dev_get_drvdata(&pdev->dev);
-
- pci_disable_sriov(pdev);
-
- vfio_unregister_group_dev(&vdev->vdev);
-
- vfio_pci_vf_uninit(vdev);
- vfio_uninit_group_dev(&vdev->vdev);
- vfio_pci_vga_uninit(vdev);
-
- vfio_iommu_group_put(pdev->dev.iommu_group, &pdev->dev);
-
- if (!disable_idle_d3)
- vfio_pci_set_power_state(vdev, PCI_D0);
-
- mutex_destroy(&vdev->ioeventfds_lock);
- kfree(vdev->region);
- kfree(vdev->pm_save);
- kfree(vdev);
-}
-
-static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev,
- pci_channel_state_t state)
-{
- struct vfio_pci_device *vdev;
- struct vfio_device *device;
-
- device = vfio_device_get_from_dev(&pdev->dev);
- if (device == NULL)
- return PCI_ERS_RESULT_DISCONNECT;
-
- vdev = container_of(device, struct vfio_pci_device, vdev);
-
- mutex_lock(&vdev->igate);
-
- if (vdev->err_trigger)
- eventfd_signal(vdev->err_trigger, 1);
-
- mutex_unlock(&vdev->igate);
-
- vfio_device_put(device);
-
- return PCI_ERS_RESULT_CAN_RECOVER;
-}
-
-static int vfio_pci_sriov_configure(struct pci_dev *pdev, int nr_virtfn)
-{
- struct vfio_device *device;
- int ret = 0;
-
- might_sleep();
-
- if (!enable_sriov)
- return -ENOENT;
-
- device = vfio_device_get_from_dev(&pdev->dev);
- if (!device)
- return -ENODEV;
-
- if (nr_virtfn == 0)
- pci_disable_sriov(pdev);
- else
- ret = pci_enable_sriov(pdev, nr_virtfn);
-
- vfio_device_put(device);
-
- return ret < 0 ? ret : nr_virtfn;
-}
-
-static const struct pci_error_handlers vfio_err_handlers = {
- .error_detected = vfio_pci_aer_err_detected,
-};
-
-static struct pci_driver vfio_pci_driver = {
- .name = "vfio-pci",
- .id_table = NULL, /* only dynamic ids */
- .probe = vfio_pci_probe,
- .remove = vfio_pci_remove,
- .sriov_configure = vfio_pci_sriov_configure,
- .err_handler = &vfio_err_handlers,
-};
-
-static bool vfio_dev_in_groups(struct vfio_pci_device *vdev,
- struct vfio_pci_group_info *groups)
-{
- unsigned int i;
-
- for (i = 0; i < groups->count; i++)
- if (groups->groups[i] == vdev->vdev.group)
- return true;
- return false;
-}
-
-static int vfio_pci_is_device_in_set(struct pci_dev *pdev, void *data)
-{
- struct vfio_device_set *dev_set = data;
- struct vfio_device *cur;
-
- list_for_each_entry(cur, &dev_set->device_list, dev_set_list)
- if (cur->dev == &pdev->dev)
- return 0;
- return -EBUSY;
-}
-
-/*
- * vfio-core considers a group to be viable and will create a vfio_device even
- * if some devices are bound to drivers like pci-stub or pcieport. Here we
- * require all PCI devices to be inside our dev_set since that ensures they stay
- * put and that every driver controlling the device can co-ordinate with the
- * device reset.
- *
- * Returns the pci_dev to pass to pci_reset_bus() if every PCI device to be
- * reset is inside the dev_set, and pci_reset_bus() can succeed. NULL otherwise.
- */
-static struct pci_dev *
-vfio_pci_dev_set_resettable(struct vfio_device_set *dev_set)
-{
- struct pci_dev *pdev;
-
- lockdep_assert_held(&dev_set->lock);
-
- /*
- * By definition all PCI devices in the dev_set share the same PCI
- * reset, so any pci_dev will have the same outcomes for
- * pci_probe_reset_*() and pci_reset_bus().
- */
- pdev = list_first_entry(&dev_set->device_list, struct vfio_pci_device,
- vdev.dev_set_list)->pdev;
-
- /* pci_reset_bus() is supported */
- if (pci_probe_reset_slot(pdev->slot) && pci_probe_reset_bus(pdev->bus))
- return NULL;
-
- if (vfio_pci_for_each_slot_or_bus(pdev, vfio_pci_is_device_in_set,
- dev_set,
- !pci_probe_reset_slot(pdev->slot)))
- return NULL;
- return pdev;
-}
-
-/*
- * We need to get memory_lock for each device, but devices can share mmap_lock,
- * therefore we need to zap and hold the vma_lock for each device, and only then
- * get each memory_lock.
- */
-static int vfio_pci_dev_set_hot_reset(struct vfio_device_set *dev_set,
- struct vfio_pci_group_info *groups)
-{
- struct vfio_pci_device *cur_mem;
- struct vfio_pci_device *cur_vma;
- struct vfio_pci_device *cur;
- struct pci_dev *pdev;
- bool is_mem = true;
- int ret;
-
- mutex_lock(&dev_set->lock);
- cur_mem = list_first_entry(&dev_set->device_list,
- struct vfio_pci_device, vdev.dev_set_list);
-
- pdev = vfio_pci_dev_set_resettable(dev_set);
- if (!pdev) {
- ret = -EINVAL;
- goto err_unlock;
- }
-
- list_for_each_entry(cur_vma, &dev_set->device_list, vdev.dev_set_list) {
- /*
- * Test whether all the affected devices are contained by the
- * set of groups provided by the user.
- */
- if (!vfio_dev_in_groups(cur_vma, groups)) {
- ret = -EINVAL;
- goto err_undo;
- }
-
- /*
- * Locking multiple devices is prone to deadlock, runaway and
- * unwind if we hit contention.
- */
- if (!vfio_pci_zap_and_vma_lock(cur_vma, true)) {
- ret = -EBUSY;
- goto err_undo;
- }
- }
- cur_vma = NULL;
-
- list_for_each_entry(cur_mem, &dev_set->device_list, vdev.dev_set_list) {
- if (!down_write_trylock(&cur_mem->memory_lock)) {
- ret = -EBUSY;
- goto err_undo;
- }
- mutex_unlock(&cur_mem->vma_lock);
- }
- cur_mem = NULL;
-
- ret = pci_reset_bus(pdev);
-
-err_undo:
- list_for_each_entry(cur, &dev_set->device_list, vdev.dev_set_list) {
- if (cur == cur_mem)
- is_mem = false;
- if (cur == cur_vma)
- break;
- if (is_mem)
- up_write(&cur->memory_lock);
- else
- mutex_unlock(&cur->vma_lock);
- }
-err_unlock:
- mutex_unlock(&dev_set->lock);
- return ret;
-}
-
-static bool vfio_pci_dev_set_needs_reset(struct vfio_device_set *dev_set)
-{
- struct vfio_pci_device *cur;
- bool needs_reset = false;
-
- list_for_each_entry(cur, &dev_set->device_list, vdev.dev_set_list) {
- /* No VFIO device in the set can have an open device FD */
- if (cur->vdev.open_count)
- return false;
- needs_reset |= cur->needs_reset;
- }
- return needs_reset;
-}
-
-/*
- * If a bus or slot reset is available for the provided dev_set and:
- * - All of the devices affected by that bus or slot reset are unused
- * - At least one of the affected devices is marked dirty via
- * needs_reset (such as by lack of FLR support)
- * Then attempt to perform that bus or slot reset.
- * Returns true if the dev_set was reset.
- */
-static bool vfio_pci_dev_set_try_reset(struct vfio_device_set *dev_set)
-{
- struct vfio_pci_device *cur;
- struct pci_dev *pdev;
- int ret;
-
- if (!vfio_pci_dev_set_needs_reset(dev_set))
- return false;
-
- pdev = vfio_pci_dev_set_resettable(dev_set);
- if (!pdev)
- return false;
-
- ret = pci_reset_bus(pdev);
- if (ret)
- return false;
-
- list_for_each_entry(cur, &dev_set->device_list, vdev.dev_set_list) {
- cur->needs_reset = false;
- if (!disable_idle_d3)
- vfio_pci_set_power_state(cur, PCI_D3hot);
- }
- return true;
-}
-
-static void __exit vfio_pci_cleanup(void)
-{
- pci_unregister_driver(&vfio_pci_driver);
- vfio_pci_uninit_perm_bits();
-}
-
-static void __init vfio_pci_fill_ids(void)
-{
- char *p, *id;
- int rc;
-
- /* no ids passed actually */
- if (ids[0] == '\0')
- return;
-
- /* add ids specified in the module parameter */
- p = ids;
- while ((id = strsep(&p, ","))) {
- unsigned int vendor, device, subvendor = PCI_ANY_ID,
- subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
- int fields;
-
- if (!strlen(id))
- continue;
-
- fields = sscanf(id, "%x:%x:%x:%x:%x:%x",
- &vendor, &device, &subvendor, &subdevice,
- &class, &class_mask);
-
- if (fields < 2) {
- pr_warn("invalid id string \"%s\"\n", id);
- continue;
- }
-
- rc = pci_add_dynid(&vfio_pci_driver, vendor, device,
- subvendor, subdevice, class, class_mask, 0);
- if (rc)
- pr_warn("failed to add dynamic id [%04x:%04x[%04x:%04x]] class %#08x/%08x (%d)\n",
- vendor, device, subvendor, subdevice,
- class, class_mask, rc);
- else
- pr_info("add [%04x:%04x[%04x:%04x]] class %#08x/%08x\n",
- vendor, device, subvendor, subdevice,
- class, class_mask);
- }
-}
-
-static int __init vfio_pci_init(void)
-{
- int ret;
-
- /* Allocate shared config space permission data used by all devices */
- ret = vfio_pci_init_perm_bits();
- if (ret)
- return ret;
-
- /* Register and scan for devices */
- ret = pci_register_driver(&vfio_pci_driver);
- if (ret)
- goto out_driver;
-
- vfio_pci_fill_ids();
-
- if (disable_denylist)
- pr_warn("device denylist disabled.\n");
-
- return 0;
-
-out_driver:
- vfio_pci_uninit_perm_bits();
- return ret;
-}
-
-module_init(vfio_pci_init);
-module_exit(vfio_pci_cleanup);
-
-MODULE_VERSION(DRIVER_VERSION);
-MODULE_LICENSE("GPL v2");
-MODULE_AUTHOR(DRIVER_AUTHOR);
-MODULE_DESCRIPTION(DRIVER_DESC);
--- /dev/null
+++ b/drivers/vfio/pci/vfio_pci_core.c
@@ -0,0 +1,2319 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
+ * Author: Alex Williamson <alex.williamson@redhat.com>
+ *
+ * Derived from original vfio:
+ * Copyright 2010 Cisco Systems, Inc. All rights reserved.
+ * Author: Tom Lyon, pugs@cisco.com
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/device.h>
+#include <linux/eventfd.h>
+#include <linux/file.h>
+#include <linux/interrupt.h>
+#include <linux/iommu.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/notifier.h>
+#include <linux/pci.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/vfio.h>
+#include <linux/vgaarb.h>
+#include <linux/nospec.h>
+#include <linux/sched/mm.h>
+
+#include "vfio_pci_private.h"
+
+#define DRIVER_VERSION "0.2"
+#define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
+#define DRIVER_DESC "VFIO PCI - User Level meta-driver"
+
+static char ids[1024] __initdata;
+module_param_string(ids, ids, sizeof(ids), 0);
+MODULE_PARM_DESC(ids, "Initial PCI IDs to add to the vfio driver, format is \"vendor:device[:subvendor[:subdevice[:class[:class_mask]]]]\" and multiple comma separated entries can be specified");
+
+static bool nointxmask;
+module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(nointxmask,
+ "Disable support for PCI 2.3 style INTx masking. If this resolves problems for specific devices, report lspci -vvvxxx to linux-pci@vger.kernel.org so the device can be fixed automatically via the broken_intx_masking flag.");
+
+#ifdef CONFIG_VFIO_PCI_VGA
+static bool disable_vga;
+module_param(disable_vga, bool, S_IRUGO);
+MODULE_PARM_DESC(disable_vga, "Disable VGA resource access through vfio-pci");
+#endif
+
+static bool disable_idle_d3;
+module_param(disable_idle_d3, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(disable_idle_d3,
+ "Disable using the PCI D3 low power state for idle, unused devices");
+
+static bool enable_sriov;
+#ifdef CONFIG_PCI_IOV
+module_param(enable_sriov, bool, 0644);
+MODULE_PARM_DESC(enable_sriov, "Enable support for SR-IOV configuration. Enabling SR-IOV on a PF typically requires support of the userspace PF driver, enabling VFs without such support may result in non-functional VFs or PF.");
+#endif
+
+static bool disable_denylist;
+module_param(disable_denylist, bool, 0444);
+MODULE_PARM_DESC(disable_denylist, "Disable use of device denylist. Disabling the denylist allows binding to devices with known errata that may lead to exploitable stability or security issues when accessed by untrusted users.");
+
+static inline bool vfio_vga_disabled(void)
+{
+#ifdef CONFIG_VFIO_PCI_VGA
+ return disable_vga;
+#else
+ return true;
+#endif
+}
+
+static bool vfio_pci_dev_in_denylist(struct pci_dev *pdev)
+{
+ switch (pdev->vendor) {
+ case PCI_VENDOR_ID_INTEL:
+ switch (pdev->device) {
+ case PCI_DEVICE_ID_INTEL_QAT_C3XXX:
+ case PCI_DEVICE_ID_INTEL_QAT_C3XXX_VF:
+ case PCI_DEVICE_ID_INTEL_QAT_C62X:
+ case PCI_DEVICE_ID_INTEL_QAT_C62X_VF:
+ case PCI_DEVICE_ID_INTEL_QAT_DH895XCC:
+ case PCI_DEVICE_ID_INTEL_QAT_DH895XCC_VF:
+ return true;
+ default:
+ return false;
+ }
+ }
+
+ return false;
+}
+
+static bool vfio_pci_is_denylisted(struct pci_dev *pdev)
+{
+ if (!vfio_pci_dev_in_denylist(pdev))
+ return false;
+
+ if (disable_denylist) {
+ pci_warn(pdev,
+ "device denylist disabled - allowing device %04x:%04x.\n",
+ pdev->vendor, pdev->device);
+ return false;
+ }
+
+ pci_warn(pdev, "%04x:%04x exists in vfio-pci device denylist, driver probing disallowed.\n",
+ pdev->vendor, pdev->device);
+
+ return true;
+}
+
+/*
+ * Our VGA arbiter participation is limited since we don't know anything
+ * about the device itself. However, if the device is the only VGA device
+ * downstream of a bridge and VFIO VGA support is disabled, then we can
+ * safely return legacy VGA IO and memory as not decoded since the user
+ * has no way to get to it and routing can be disabled externally at the
+ * bridge.
+ */
+static unsigned int vfio_pci_set_decode(struct pci_dev *pdev, bool single_vga)
+{
+ struct pci_dev *tmp = NULL;
+ unsigned char max_busnr;
+ unsigned int decodes;
+
+ if (single_vga || !vfio_vga_disabled() || pci_is_root_bus(pdev->bus))
+ return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
+ VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
+
+ max_busnr = pci_bus_max_busnr(pdev->bus);
+ decodes = VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
+
+ while ((tmp = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, tmp)) != NULL) {
+ if (tmp == pdev ||
+ pci_domain_nr(tmp->bus) != pci_domain_nr(pdev->bus) ||
+ pci_is_root_bus(tmp->bus))
+ continue;
+
+ if (tmp->bus->number >= pdev->bus->number &&
+ tmp->bus->number <= max_busnr) {
+ pci_dev_put(tmp);
+ decodes |= VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
+ break;
+ }
+ }
+
+ return decodes;
+}
+
+static inline bool vfio_pci_is_vga(struct pci_dev *pdev)
+{
+ return (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
+}
+
+static void vfio_pci_probe_mmaps(struct vfio_pci_device *vdev)
+{
+ struct resource *res;
+ int i;
+ struct vfio_pci_dummy_resource *dummy_res;
+
+ for (i = 0; i < PCI_STD_NUM_BARS; i++) {
+ int bar = i + PCI_STD_RESOURCES;
+
+ res = &vdev->pdev->resource[bar];
+
+ if (!IS_ENABLED(CONFIG_VFIO_PCI_MMAP))
+ goto no_mmap;
+
+ if (!(res->flags & IORESOURCE_MEM))
+ goto no_mmap;
+
+ /*
+ * The PCI core shouldn't set up a resource with a
+ * type but zero size. But there may be bugs that
+ * cause us to do that.
+ */
+ if (!resource_size(res))
+ goto no_mmap;
+
+ if (resource_size(res) >= PAGE_SIZE) {
+ vdev->bar_mmap_supported[bar] = true;
+ continue;
+ }
+
+ if (!(res->start & ~PAGE_MASK)) {
+ /*
+ * Add a dummy resource to reserve the remainder
+ * of the exclusive page in case that hot-add
+ * device's bar is assigned into it.
+ */
+ dummy_res = kzalloc(sizeof(*dummy_res), GFP_KERNEL);
+ if (dummy_res == NULL)
+ goto no_mmap;
+
+ dummy_res->resource.name = "vfio sub-page reserved";
+ dummy_res->resource.start = res->end + 1;
+ dummy_res->resource.end = res->start + PAGE_SIZE - 1;
+ dummy_res->resource.flags = res->flags;
+ if (request_resource(res->parent,
+ &dummy_res->resource)) {
+ kfree(dummy_res);
+ goto no_mmap;
+ }
+ dummy_res->index = bar;
+ list_add(&dummy_res->res_next,
+ &vdev->dummy_resources_list);
+ vdev->bar_mmap_supported[bar] = true;
+ continue;
+ }
+ /*
+ * Here we don't handle the case when the BAR is not page
+ * aligned because we can't expect the BAR will be
+ * assigned into the same location in a page in guest
+ * when we passthrough the BAR. And it's hard to access
+ * this BAR in userspace because we have no way to get
+ * the BAR's location in a page.
+ */
+no_mmap:
+ vdev->bar_mmap_supported[bar] = false;
+ }
+}
+
+struct vfio_pci_group_info;
+static bool vfio_pci_dev_set_try_reset(struct vfio_device_set *dev_set);
+static void vfio_pci_disable(struct vfio_pci_device *vdev);
+static int vfio_pci_dev_set_hot_reset(struct vfio_device_set *dev_set,
+ struct vfio_pci_group_info *groups);
+
+/*
+ * INTx masking requires the ability to disable INTx signaling via PCI_COMMAND
+ * _and_ the ability detect when the device is asserting INTx via PCI_STATUS.
+ * If a device implements the former but not the latter we would typically
+ * expect broken_intx_masking be set and require an exclusive interrupt.
+ * However since we do have control of the device's ability to assert INTx,
+ * we can instead pretend that the device does not implement INTx, virtualizing
+ * the pin register to report zero and maintaining DisINTx set on the host.
+ */
+static bool vfio_pci_nointx(struct pci_dev *pdev)
+{
+ switch (pdev->vendor) {
+ case PCI_VENDOR_ID_INTEL:
+ switch (pdev->device) {
+ /* All i40e (XL710/X710/XXV710) 10/20/25/40GbE NICs */
+ case 0x1572:
+ case 0x1574:
+ case 0x1580 ... 0x1581:
+ case 0x1583 ... 0x158b:
+ case 0x37d0 ... 0x37d2:
+ /* X550 */
+ case 0x1563:
+ return true;
+ default:
+ return false;
+ }
+ }
+
+ return false;
+}
+
+static void vfio_pci_probe_power_state(struct vfio_pci_device *vdev)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ u16 pmcsr;
+
+ if (!pdev->pm_cap)
+ return;
+
+ pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &pmcsr);
+
+ vdev->needs_pm_restore = !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET);
+}
+
+/*
+ * pci_set_power_state() wrapper handling devices which perform a soft reset on
+ * D3->D0 transition. Save state prior to D0/1/2->D3, stash it on the vdev,
+ * restore when returned to D0. Saved separately from pci_saved_state for use
+ * by PM capability emulation and separately from pci_dev internal saved state
+ * to avoid it being overwritten and consumed around other resets.
+ */
+int vfio_pci_set_power_state(struct vfio_pci_device *vdev, pci_power_t state)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ bool needs_restore = false, needs_save = false;
+ int ret;
+
+ if (vdev->needs_pm_restore) {
+ if (pdev->current_state < PCI_D3hot && state >= PCI_D3hot) {
+ pci_save_state(pdev);
+ needs_save = true;
+ }
+
+ if (pdev->current_state >= PCI_D3hot && state <= PCI_D0)
+ needs_restore = true;
+ }
+
+ ret = pci_set_power_state(pdev, state);
+
+ if (!ret) {
+ /* D3 might be unsupported via quirk, skip unless in D3 */
+ if (needs_save && pdev->current_state >= PCI_D3hot) {
+ vdev->pm_save = pci_store_saved_state(pdev);
+ } else if (needs_restore) {
+ pci_load_and_free_saved_state(pdev, &vdev->pm_save);
+ pci_restore_state(pdev);
+ }
+ }
+
+ return ret;
+}
+
+static int vfio_pci_enable(struct vfio_pci_device *vdev)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ int ret;
+ u16 cmd;
+ u8 msix_pos;
+
+ vfio_pci_set_power_state(vdev, PCI_D0);
+
+ /* Don't allow our initial saved state to include busmaster */
+ pci_clear_master(pdev);
+
+ ret = pci_enable_device(pdev);
+ if (ret)
+ return ret;
+
+ /* If reset fails because of the device lock, fail this path entirely */
+ ret = pci_try_reset_function(pdev);
+ if (ret == -EAGAIN) {
+ pci_disable_device(pdev);
+ return ret;
+ }
+
+ vdev->reset_works = !ret;
+ pci_save_state(pdev);
+ vdev->pci_saved_state = pci_store_saved_state(pdev);
+ if (!vdev->pci_saved_state)
+ pci_dbg(pdev, "%s: Couldn't store saved state\n", __func__);
+
+ if (likely(!nointxmask)) {
+ if (vfio_pci_nointx(pdev)) {
+ pci_info(pdev, "Masking broken INTx support\n");
+ vdev->nointx = true;
+ pci_intx(pdev, 0);
+ } else
+ vdev->pci_2_3 = pci_intx_mask_supported(pdev);
+ }
+
+ pci_read_config_word(pdev, PCI_COMMAND, &cmd);
+ if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) {
+ cmd &= ~PCI_COMMAND_INTX_DISABLE;
+ pci_write_config_word(pdev, PCI_COMMAND, cmd);
+ }
+
+ ret = vfio_config_init(vdev);
+ if (ret) {
+ kfree(vdev->pci_saved_state);
+ vdev->pci_saved_state = NULL;
+ pci_disable_device(pdev);
+ return ret;
+ }
+
+ msix_pos = pdev->msix_cap;
+ if (msix_pos) {
+ u16 flags;
+ u32 table;
+
+ pci_read_config_word(pdev, msix_pos + PCI_MSIX_FLAGS, &flags);
+ pci_read_config_dword(pdev, msix_pos + PCI_MSIX_TABLE, &table);
+
+ vdev->msix_bar = table & PCI_MSIX_TABLE_BIR;
+ vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET;
+ vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16;
+ } else
+ vdev->msix_bar = 0xFF;
+
+ if (!vfio_vga_disabled() && vfio_pci_is_vga(pdev))
+ vdev->has_vga = true;
+
+ if (vfio_pci_is_vga(pdev) &&
+ pdev->vendor == PCI_VENDOR_ID_INTEL &&
+ IS_ENABLED(CONFIG_VFIO_PCI_IGD)) {
+ ret = vfio_pci_igd_init(vdev);
+ if (ret && ret != -ENODEV) {
+ pci_warn(pdev, "Failed to setup Intel IGD regions\n");
+ goto disable_exit;
+ }
+ }
+
+ vfio_pci_probe_mmaps(vdev);
+
+ return 0;
+
+disable_exit:
+ vfio_pci_disable(vdev);
+ return ret;
+}
+
+static void vfio_pci_disable(struct vfio_pci_device *vdev)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ struct vfio_pci_dummy_resource *dummy_res, *tmp;
+ struct vfio_pci_ioeventfd *ioeventfd, *ioeventfd_tmp;
+ int i, bar;
+
+ /* For needs_reset */
+ lockdep_assert_held(&vdev->vdev.dev_set->lock);
+
+ /* Stop the device from further DMA */
+ pci_clear_master(pdev);
+
+ vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE |
+ VFIO_IRQ_SET_ACTION_TRIGGER,
+ vdev->irq_type, 0, 0, NULL);
+
+ /* Device closed, don't need mutex here */
+ list_for_each_entry_safe(ioeventfd, ioeventfd_tmp,
+ &vdev->ioeventfds_list, next) {
+ vfio_virqfd_disable(&ioeventfd->virqfd);
+ list_del(&ioeventfd->next);
+ kfree(ioeventfd);
+ }
+ vdev->ioeventfds_nr = 0;
+
+ vdev->virq_disabled = false;
+
+ for (i = 0; i < vdev->num_regions; i++)
+ vdev->region[i].ops->release(vdev, &vdev->region[i]);
+
+ vdev->num_regions = 0;
+ kfree(vdev->region);
+ vdev->region = NULL; /* don't krealloc a freed pointer */
+
+ vfio_config_free(vdev);
+
+ for (i = 0; i < PCI_STD_NUM_BARS; i++) {
+ bar = i + PCI_STD_RESOURCES;
+ if (!vdev->barmap[bar])
+ continue;
+ pci_iounmap(pdev, vdev->barmap[bar]);
+ pci_release_selected_regions(pdev, 1 << bar);
+ vdev->barmap[bar] = NULL;
+ }
+
+ list_for_each_entry_safe(dummy_res, tmp,
+ &vdev->dummy_resources_list, res_next) {
+ list_del(&dummy_res->res_next);
+ release_resource(&dummy_res->resource);
+ kfree(dummy_res);
+ }
+
+ vdev->needs_reset = true;
+
+ /*
+ * If we have saved state, restore it. If we can reset the device,
+ * even better. Resetting with current state seems better than
+ * nothing, but saving and restoring current state without reset
+ * is just busy work.
+ */
+ if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) {
+ pci_info(pdev, "%s: Couldn't reload saved state\n", __func__);
+
+ if (!vdev->reset_works)
+ goto out;
+
+ pci_save_state(pdev);
+ }
+
+ /*
+ * Disable INTx and MSI, presumably to avoid spurious interrupts
+ * during reset. Stolen from pci_reset_function()
+ */
+ pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
+
+ /*
+ * Try to get the locks ourselves to prevent a deadlock. The
+ * success of this is dependent on being able to lock the device,
+ * which is not always possible.
+ * We can not use the "try" reset interface here, which will
+ * overwrite the previously restored configuration information.
+ */
+ if (vdev->reset_works && pci_dev_trylock(pdev)) {
+ if (!__pci_reset_function_locked(pdev))
+ vdev->needs_reset = false;
+ pci_dev_unlock(pdev);
+ }
+
+ pci_restore_state(pdev);
+out:
+ pci_disable_device(pdev);
+
+ if (!vfio_pci_dev_set_try_reset(vdev->vdev.dev_set) && !disable_idle_d3)
+ vfio_pci_set_power_state(vdev, PCI_D3hot);
+}
+
+static struct pci_driver vfio_pci_driver;
+
+static struct vfio_pci_device *get_pf_vdev(struct vfio_pci_device *vdev)
+{
+ struct pci_dev *physfn = pci_physfn(vdev->pdev);
+ struct vfio_device *pf_dev;
+
+ if (!vdev->pdev->is_virtfn)
+ return NULL;
+
+ pf_dev = vfio_device_get_from_dev(&physfn->dev);
+ if (!pf_dev)
+ return NULL;
+
+ if (pci_dev_driver(physfn) != &vfio_pci_driver) {
+ vfio_device_put(pf_dev);
+ return NULL;
+ }
+
+ return container_of(pf_dev, struct vfio_pci_device, vdev);
+}
+
+static void vfio_pci_vf_token_user_add(struct vfio_pci_device *vdev, int val)
+{
+ struct vfio_pci_device *pf_vdev = get_pf_vdev(vdev);
+
+ if (!pf_vdev)
+ return;
+
+ mutex_lock(&pf_vdev->vf_token->lock);
+ pf_vdev->vf_token->users += val;
+ WARN_ON(pf_vdev->vf_token->users < 0);
+ mutex_unlock(&pf_vdev->vf_token->lock);
+
+ vfio_device_put(&pf_vdev->vdev);
+}
+
+static void vfio_pci_close_device(struct vfio_device *core_vdev)
+{
+ struct vfio_pci_device *vdev =
+ container_of(core_vdev, struct vfio_pci_device, vdev);
+
+ vfio_pci_vf_token_user_add(vdev, -1);
+ vfio_spapr_pci_eeh_release(vdev->pdev);
+ vfio_pci_disable(vdev);
+
+ mutex_lock(&vdev->igate);
+ if (vdev->err_trigger) {
+ eventfd_ctx_put(vdev->err_trigger);
+ vdev->err_trigger = NULL;
+ }
+ if (vdev->req_trigger) {
+ eventfd_ctx_put(vdev->req_trigger);
+ vdev->req_trigger = NULL;
+ }
+ mutex_unlock(&vdev->igate);
+}
+
+static int vfio_pci_open_device(struct vfio_device *core_vdev)
+{
+ struct vfio_pci_device *vdev =
+ container_of(core_vdev, struct vfio_pci_device, vdev);
+ int ret = 0;
+
+ ret = vfio_pci_enable(vdev);
+ if (ret)
+ return ret;
+
+ vfio_spapr_pci_eeh_open(vdev->pdev);
+ vfio_pci_vf_token_user_add(vdev, 1);
+ return 0;
+}
+
+static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
+{
+ if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) {
+ u8 pin;
+
+ if (!IS_ENABLED(CONFIG_VFIO_PCI_INTX) ||
+ vdev->nointx || vdev->pdev->is_virtfn)
+ return 0;
+
+ pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
+
+ return pin ? 1 : 0;
+ } else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) {
+ u8 pos;
+ u16 flags;
+
+ pos = vdev->pdev->msi_cap;
+ if (pos) {
+ pci_read_config_word(vdev->pdev,
+ pos + PCI_MSI_FLAGS, &flags);
+ return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1);
+ }
+ } else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) {
+ u8 pos;
+ u16 flags;
+
+ pos = vdev->pdev->msix_cap;
+ if (pos) {
+ pci_read_config_word(vdev->pdev,
+ pos + PCI_MSIX_FLAGS, &flags);
+
+ return (flags & PCI_MSIX_FLAGS_QSIZE) + 1;
+ }
+ } else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX) {
+ if (pci_is_pcie(vdev->pdev))
+ return 1;
+ } else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) {
+ return 1;
+ }
+
+ return 0;
+}
+
+static int vfio_pci_count_devs(struct pci_dev *pdev, void *data)
+{
+ (*(int *)data)++;
+ return 0;
+}
+
+struct vfio_pci_fill_info {
+ int max;
+ int cur;
+ struct vfio_pci_dependent_device *devices;
+};
+
+static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data)
+{
+ struct vfio_pci_fill_info *fill = data;
+ struct iommu_group *iommu_group;
+
+ if (fill->cur == fill->max)
+ return -EAGAIN; /* Something changed, try again */
+
+ iommu_group = iommu_group_get(&pdev->dev);
+ if (!iommu_group)
+ return -EPERM; /* Cannot reset non-isolated devices */
+
+ fill->devices[fill->cur].group_id = iommu_group_id(iommu_group);
+ fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus);
+ fill->devices[fill->cur].bus = pdev->bus->number;
+ fill->devices[fill->cur].devfn = pdev->devfn;
+ fill->cur++;
+ iommu_group_put(iommu_group);
+ return 0;
+}
+
+struct vfio_pci_group_info {
+ int count;
+ struct vfio_group **groups;
+};
+
+static bool vfio_pci_dev_below_slot(struct pci_dev *pdev, struct pci_slot *slot)
+{
+ for (; pdev; pdev = pdev->bus->self)
+ if (pdev->bus == slot->bus)
+ return (pdev->slot == slot);
+ return false;
+}
+
+struct vfio_pci_walk_info {
+ int (*fn)(struct pci_dev *, void *data);
+ void *data;
+ struct pci_dev *pdev;
+ bool slot;
+ int ret;
+};
+
+static int vfio_pci_walk_wrapper(struct pci_dev *pdev, void *data)
+{
+ struct vfio_pci_walk_info *walk = data;
+
+ if (!walk->slot || vfio_pci_dev_below_slot(pdev, walk->pdev->slot))
+ walk->ret = walk->fn(pdev, walk->data);
+
+ return walk->ret;
+}
+
+static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev,
+ int (*fn)(struct pci_dev *,
+ void *data), void *data,
+ bool slot)
+{
+ struct vfio_pci_walk_info walk = {
+ .fn = fn, .data = data, .pdev = pdev, .slot = slot, .ret = 0,
+ };
+
+ pci_walk_bus(pdev->bus, vfio_pci_walk_wrapper, &walk);
+
+ return walk.ret;
+}
+
+static int msix_mmappable_cap(struct vfio_pci_device *vdev,
+ struct vfio_info_cap *caps)
+{
+ struct vfio_info_cap_header header = {
+ .id = VFIO_REGION_INFO_CAP_MSIX_MAPPABLE,
+ .version = 1
+ };
+
+ return vfio_info_add_capability(caps, &header, sizeof(header));
+}
+
+int vfio_pci_register_dev_region(struct vfio_pci_device *vdev,
+ unsigned int type, unsigned int subtype,
+ const struct vfio_pci_regops *ops,
+ size_t size, u32 flags, void *data)
+{
+ struct vfio_pci_region *region;
+
+ region = krealloc(vdev->region,
+ (vdev->num_regions + 1) * sizeof(*region),
+ GFP_KERNEL);
+ if (!region)
+ return -ENOMEM;
+
+ vdev->region = region;
+ vdev->region[vdev->num_regions].type = type;
+ vdev->region[vdev->num_regions].subtype = subtype;
+ vdev->region[vdev->num_regions].ops = ops;
+ vdev->region[vdev->num_regions].size = size;
+ vdev->region[vdev->num_regions].flags = flags;
+ vdev->region[vdev->num_regions].data = data;
+
+ vdev->num_regions++;
+
+ return 0;
+}
+
+static long vfio_pci_ioctl(struct vfio_device *core_vdev,
+ unsigned int cmd, unsigned long arg)
+{
+ struct vfio_pci_device *vdev =
+ container_of(core_vdev, struct vfio_pci_device, vdev);
+ unsigned long minsz;
+
+ if (cmd == VFIO_DEVICE_GET_INFO) {
+ struct vfio_device_info info;
+ struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
+ unsigned long capsz;
+ int ret;
+
+ minsz = offsetofend(struct vfio_device_info, num_irqs);
+
+ /* For backward compatibility, cannot require this */
+ capsz = offsetofend(struct vfio_iommu_type1_info, cap_offset);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ if (info.argsz >= capsz) {
+ minsz = capsz;
+ info.cap_offset = 0;
+ }
+
+ info.flags = VFIO_DEVICE_FLAGS_PCI;
+
+ if (vdev->reset_works)
+ info.flags |= VFIO_DEVICE_FLAGS_RESET;
+
+ info.num_regions = VFIO_PCI_NUM_REGIONS + vdev->num_regions;
+ info.num_irqs = VFIO_PCI_NUM_IRQS;
+
+ ret = vfio_pci_info_zdev_add_caps(vdev, &caps);
+ if (ret && ret != -ENODEV) {
+ pci_warn(vdev->pdev, "Failed to setup zPCI info capabilities\n");
+ return ret;
+ }
+
+ if (caps.size) {
+ info.flags |= VFIO_DEVICE_FLAGS_CAPS;
+ if (info.argsz < sizeof(info) + caps.size) {
+ info.argsz = sizeof(info) + caps.size;
+ } else {
+ vfio_info_cap_shift(&caps, sizeof(info));
+ if (copy_to_user((void __user *)arg +
+ sizeof(info), caps.buf,
+ caps.size)) {
+ kfree(caps.buf);
+ return -EFAULT;
+ }
+ info.cap_offset = sizeof(info);
+ }
+
+ kfree(caps.buf);
+ }
+
+ return copy_to_user((void __user *)arg, &info, minsz) ?
+ -EFAULT : 0;
+
+ } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
+ struct pci_dev *pdev = vdev->pdev;
+ struct vfio_region_info info;
+ struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
+ int i, ret;
+
+ minsz = offsetofend(struct vfio_region_info, offset);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ switch (info.index) {
+ case VFIO_PCI_CONFIG_REGION_INDEX:
+ info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
+ info.size = pdev->cfg_size;
+ info.flags = VFIO_REGION_INFO_FLAG_READ |
+ VFIO_REGION_INFO_FLAG_WRITE;
+ break;
+ case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
+ info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
+ info.size = pci_resource_len(pdev, info.index);
+ if (!info.size) {
+ info.flags = 0;
+ break;
+ }
+
+ info.flags = VFIO_REGION_INFO_FLAG_READ |
+ VFIO_REGION_INFO_FLAG_WRITE;
+ if (vdev->bar_mmap_supported[info.index]) {
+ info.flags |= VFIO_REGION_INFO_FLAG_MMAP;
+ if (info.index == vdev->msix_bar) {
+ ret = msix_mmappable_cap(vdev, &caps);
+ if (ret)
+ return ret;
+ }
+ }
+
+ break;
+ case VFIO_PCI_ROM_REGION_INDEX:
+ {
+ void __iomem *io;
+ size_t size;
+ u16 cmd;
+
+ info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
+ info.flags = 0;
+
+ /* Report the BAR size, not the ROM size */
+ info.size = pci_resource_len(pdev, info.index);
+ if (!info.size) {
+ /* Shadow ROMs appear as PCI option ROMs */
+ if (pdev->resource[PCI_ROM_RESOURCE].flags &
+ IORESOURCE_ROM_SHADOW)
+ info.size = 0x20000;
+ else
+ break;
+ }
+
+ /*
+ * Is it really there? Enable memory decode for
+ * implicit access in pci_map_rom().
+ */
+ cmd = vfio_pci_memory_lock_and_enable(vdev);
+ io = pci_map_rom(pdev, &size);
+ if (io) {
+ info.flags = VFIO_REGION_INFO_FLAG_READ;
+ pci_unmap_rom(pdev, io);
+ } else {
+ info.size = 0;
+ }
+ vfio_pci_memory_unlock_and_restore(vdev, cmd);
+
+ break;
+ }
+ case VFIO_PCI_VGA_REGION_INDEX:
+ if (!vdev->has_vga)
+ return -EINVAL;
+
+ info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
+ info.size = 0xc0000;
+ info.flags = VFIO_REGION_INFO_FLAG_READ |
+ VFIO_REGION_INFO_FLAG_WRITE;
+
+ break;
+ default:
+ {
+ struct vfio_region_info_cap_type cap_type = {
+ .header.id = VFIO_REGION_INFO_CAP_TYPE,
+ .header.version = 1 };
+
+ if (info.index >=
+ VFIO_PCI_NUM_REGIONS + vdev->num_regions)
+ return -EINVAL;
+ info.index = array_index_nospec(info.index,
+ VFIO_PCI_NUM_REGIONS +
+ vdev->num_regions);
+
+ i = info.index - VFIO_PCI_NUM_REGIONS;
+
+ info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
+ info.size = vdev->region[i].size;
+ info.flags = vdev->region[i].flags;
+
+ cap_type.type = vdev->region[i].type;
+ cap_type.subtype = vdev->region[i].subtype;
+
+ ret = vfio_info_add_capability(&caps, &cap_type.header,
+ sizeof(cap_type));
+ if (ret)
+ return ret;
+
+ if (vdev->region[i].ops->add_capability) {
+ ret = vdev->region[i].ops->add_capability(vdev,
+ &vdev->region[i], &caps);
+ if (ret)
+ return ret;
+ }
+ }
+ }
+
+ if (caps.size) {
+ info.flags |= VFIO_REGION_INFO_FLAG_CAPS;
+ if (info.argsz < sizeof(info) + caps.size) {
+ info.argsz = sizeof(info) + caps.size;
+ info.cap_offset = 0;
+ } else {
+ vfio_info_cap_shift(&caps, sizeof(info));
+ if (copy_to_user((void __user *)arg +
+ sizeof(info), caps.buf,
+ caps.size)) {
+ kfree(caps.buf);
+ return -EFAULT;
+ }
+ info.cap_offset = sizeof(info);
+ }
+
+ kfree(caps.buf);
+ }
+
+ return copy_to_user((void __user *)arg, &info, minsz) ?
+ -EFAULT : 0;
+
+ } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
+ struct vfio_irq_info info;
+
+ minsz = offsetofend(struct vfio_irq_info, count);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS)
+ return -EINVAL;
+
+ switch (info.index) {
+ case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX:
+ case VFIO_PCI_REQ_IRQ_INDEX:
+ break;
+ case VFIO_PCI_ERR_IRQ_INDEX:
+ if (pci_is_pcie(vdev->pdev))
+ break;
+ fallthrough;
+ default:
+ return -EINVAL;
+ }
+
+ info.flags = VFIO_IRQ_INFO_EVENTFD;
+
+ info.count = vfio_pci_get_irq_count(vdev, info.index);
+
+ if (info.index == VFIO_PCI_INTX_IRQ_INDEX)
+ info.flags |= (VFIO_IRQ_INFO_MASKABLE |
+ VFIO_IRQ_INFO_AUTOMASKED);
+ else
+ info.flags |= VFIO_IRQ_INFO_NORESIZE;
+
+ return copy_to_user((void __user *)arg, &info, minsz) ?
+ -EFAULT : 0;
+
+ } else if (cmd == VFIO_DEVICE_SET_IRQS) {
+ struct vfio_irq_set hdr;
+ u8 *data = NULL;
+ int max, ret = 0;
+ size_t data_size = 0;
+
+ minsz = offsetofend(struct vfio_irq_set, count);
+
+ if (copy_from_user(&hdr, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ max = vfio_pci_get_irq_count(vdev, hdr.index);
+
+ ret = vfio_set_irqs_validate_and_prepare(&hdr, max,
+ VFIO_PCI_NUM_IRQS, &data_size);
+ if (ret)
+ return ret;
+
+ if (data_size) {
+ data = memdup_user((void __user *)(arg + minsz),
+ data_size);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+ }
+
+ mutex_lock(&vdev->igate);
+
+ ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
+ hdr.start, hdr.count, data);
+
+ mutex_unlock(&vdev->igate);
+ kfree(data);
+
+ return ret;
+
+ } else if (cmd == VFIO_DEVICE_RESET) {
+ int ret;
+
+ if (!vdev->reset_works)
+ return -EINVAL;
+
+ vfio_pci_zap_and_down_write_memory_lock(vdev);
+ ret = pci_try_reset_function(vdev->pdev);
+ up_write(&vdev->memory_lock);
+
+ return ret;
+
+ } else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) {
+ struct vfio_pci_hot_reset_info hdr;
+ struct vfio_pci_fill_info fill = { 0 };
+ struct vfio_pci_dependent_device *devices = NULL;
+ bool slot = false;
+ int ret = 0;
+
+ minsz = offsetofend(struct vfio_pci_hot_reset_info, count);
+
+ if (copy_from_user(&hdr, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (hdr.argsz < minsz)
+ return -EINVAL;
+
+ hdr.flags = 0;
+
+ /* Can we do a slot or bus reset or neither? */
+ if (!pci_probe_reset_slot(vdev->pdev->slot))
+ slot = true;
+ else if (pci_probe_reset_bus(vdev->pdev->bus))
+ return -ENODEV;
+
+ /* How many devices are affected? */
+ ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
+ vfio_pci_count_devs,
+ &fill.max, slot);
+ if (ret)
+ return ret;
+
+ WARN_ON(!fill.max); /* Should always be at least one */
+
+ /*
+ * If there's enough space, fill it now, otherwise return
+ * -ENOSPC and the number of devices affected.
+ */
+ if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) {
+ ret = -ENOSPC;
+ hdr.count = fill.max;
+ goto reset_info_exit;
+ }
+
+ devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL);
+ if (!devices)
+ return -ENOMEM;
+
+ fill.devices = devices;
+
+ ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
+ vfio_pci_fill_devs,
+ &fill, slot);
+
+ /*
+ * If a device was removed between counting and filling,
+ * we may come up short of fill.max. If a device was
+ * added, we'll have a return of -EAGAIN above.
+ */
+ if (!ret)
+ hdr.count = fill.cur;
+
+reset_info_exit:
+ if (copy_to_user((void __user *)arg, &hdr, minsz))
+ ret = -EFAULT;
+
+ if (!ret) {
+ if (copy_to_user((void __user *)(arg + minsz), devices,
+ hdr.count * sizeof(*devices)))
+ ret = -EFAULT;
+ }
+
+ kfree(devices);
+ return ret;
+
+ } else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) {
+ struct vfio_pci_hot_reset hdr;
+ int32_t *group_fds;
+ struct vfio_group **groups;
+ struct vfio_pci_group_info info;
+ bool slot = false;
+ int group_idx, count = 0, ret = 0;
+
+ minsz = offsetofend(struct vfio_pci_hot_reset, count);
+
+ if (copy_from_user(&hdr, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (hdr.argsz < minsz || hdr.flags)
+ return -EINVAL;
+
+ /* Can we do a slot or bus reset or neither? */
+ if (!pci_probe_reset_slot(vdev->pdev->slot))
+ slot = true;
+ else if (pci_probe_reset_bus(vdev->pdev->bus))
+ return -ENODEV;
+
+ /*
+ * We can't let userspace give us an arbitrarily large
+ * buffer to copy, so verify how many we think there
+ * could be. Note groups can have multiple devices so
+ * one group per device is the max.
+ */
+ ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
+ vfio_pci_count_devs,
+ &count, slot);
+ if (ret)
+ return ret;
+
+ /* Somewhere between 1 and count is OK */
+ if (!hdr.count || hdr.count > count)
+ return -EINVAL;
+
+ group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL);
+ groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL);
+ if (!group_fds || !groups) {
+ kfree(group_fds);
+ kfree(groups);
+ return -ENOMEM;
+ }
+
+ if (copy_from_user(group_fds, (void __user *)(arg + minsz),
+ hdr.count * sizeof(*group_fds))) {
+ kfree(group_fds);
+ kfree(groups);
+ return -EFAULT;
+ }
+
+ /*
+ * For each group_fd, get the group through the vfio external
+ * user interface and store the group and iommu ID. This
+ * ensures the group is held across the reset.
+ */
+ for (group_idx = 0; group_idx < hdr.count; group_idx++) {
+ struct vfio_group *group;
+ struct fd f = fdget(group_fds[group_idx]);
+ if (!f.file) {
+ ret = -EBADF;
+ break;
+ }
+
+ group = vfio_group_get_external_user(f.file);
+ fdput(f);
+ if (IS_ERR(group)) {
+ ret = PTR_ERR(group);
+ break;
+ }
+
+ groups[group_idx] = group;
+ }
+
+ kfree(group_fds);
+
+ /* release reference to groups on error */
+ if (ret)
+ goto hot_reset_release;
+
+ info.count = hdr.count;
+ info.groups = groups;
+
+ ret = vfio_pci_dev_set_hot_reset(vdev->vdev.dev_set, &info);
+
+hot_reset_release:
+ for (group_idx--; group_idx >= 0; group_idx--)
+ vfio_group_put_external_user(groups[group_idx]);
+
+ kfree(groups);
+ return ret;
+ } else if (cmd == VFIO_DEVICE_IOEVENTFD) {
+ struct vfio_device_ioeventfd ioeventfd;
+ int count;
+
+ minsz = offsetofend(struct vfio_device_ioeventfd, fd);
+
+ if (copy_from_user(&ioeventfd, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (ioeventfd.argsz < minsz)
+ return -EINVAL;
+
+ if (ioeventfd.flags & ~VFIO_DEVICE_IOEVENTFD_SIZE_MASK)
+ return -EINVAL;
+
+ count = ioeventfd.flags & VFIO_DEVICE_IOEVENTFD_SIZE_MASK;
+
+ if (hweight8(count) != 1 || ioeventfd.fd < -1)
+ return -EINVAL;
+
+ return vfio_pci_ioeventfd(vdev, ioeventfd.offset,
+ ioeventfd.data, count, ioeventfd.fd);
+ } else if (cmd == VFIO_DEVICE_FEATURE) {
+ struct vfio_device_feature feature;
+ uuid_t uuid;
+
+ minsz = offsetofend(struct vfio_device_feature, flags);
+
+ if (copy_from_user(&feature, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (feature.argsz < minsz)
+ return -EINVAL;
+
+ /* Check unknown flags */
+ if (feature.flags & ~(VFIO_DEVICE_FEATURE_MASK |
+ VFIO_DEVICE_FEATURE_SET |
+ VFIO_DEVICE_FEATURE_GET |
+ VFIO_DEVICE_FEATURE_PROBE))
+ return -EINVAL;
+
+ /* GET & SET are mutually exclusive except with PROBE */
+ if (!(feature.flags & VFIO_DEVICE_FEATURE_PROBE) &&
+ (feature.flags & VFIO_DEVICE_FEATURE_SET) &&
+ (feature.flags & VFIO_DEVICE_FEATURE_GET))
+ return -EINVAL;
+
+ switch (feature.flags & VFIO_DEVICE_FEATURE_MASK) {
+ case VFIO_DEVICE_FEATURE_PCI_VF_TOKEN:
+ if (!vdev->vf_token)
+ return -ENOTTY;
+
+ /*
+ * We do not support GET of the VF Token UUID as this
+ * could expose the token of the previous device user.
+ */
+ if (feature.flags & VFIO_DEVICE_FEATURE_GET)
+ return -EINVAL;
+
+ if (feature.flags & VFIO_DEVICE_FEATURE_PROBE)
+ return 0;
+
+ /* Don't SET unless told to do so */
+ if (!(feature.flags & VFIO_DEVICE_FEATURE_SET))
+ return -EINVAL;
+
+ if (feature.argsz < minsz + sizeof(uuid))
+ return -EINVAL;
+
+ if (copy_from_user(&uuid, (void __user *)(arg + minsz),
+ sizeof(uuid)))
+ return -EFAULT;
+
+ mutex_lock(&vdev->vf_token->lock);
+ uuid_copy(&vdev->vf_token->uuid, &uuid);
+ mutex_unlock(&vdev->vf_token->lock);
+
+ return 0;
+ default:
+ return -ENOTTY;
+ }
+ }
+
+ return -ENOTTY;
+}
+
+static ssize_t vfio_pci_rw(struct vfio_pci_device *vdev, char __user *buf,
+ size_t count, loff_t *ppos, bool iswrite)
+{
+ unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
+
+ if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions)
+ return -EINVAL;
+
+ switch (index) {
+ case VFIO_PCI_CONFIG_REGION_INDEX:
+ return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite);
+
+ case VFIO_PCI_ROM_REGION_INDEX:
+ if (iswrite)
+ return -EINVAL;
+ return vfio_pci_bar_rw(vdev, buf, count, ppos, false);
+
+ case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
+ return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite);
+
+ case VFIO_PCI_VGA_REGION_INDEX:
+ return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite);
+ default:
+ index -= VFIO_PCI_NUM_REGIONS;
+ return vdev->region[index].ops->rw(vdev, buf,
+ count, ppos, iswrite);
+ }
+
+ return -EINVAL;
+}
+
+static ssize_t vfio_pci_read(struct vfio_device *core_vdev, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct vfio_pci_device *vdev =
+ container_of(core_vdev, struct vfio_pci_device, vdev);
+
+ if (!count)
+ return 0;
+
+ return vfio_pci_rw(vdev, buf, count, ppos, false);
+}
+
+static ssize_t vfio_pci_write(struct vfio_device *core_vdev, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct vfio_pci_device *vdev =
+ container_of(core_vdev, struct vfio_pci_device, vdev);
+
+ if (!count)
+ return 0;
+
+ return vfio_pci_rw(vdev, (char __user *)buf, count, ppos, true);
+}
+
+/* Return 1 on zap and vma_lock acquired, 0 on contention (only with @try) */
+static int vfio_pci_zap_and_vma_lock(struct vfio_pci_device *vdev, bool try)
+{
+ struct vfio_pci_mmap_vma *mmap_vma, *tmp;
+
+ /*
+ * Lock ordering:
+ * vma_lock is nested under mmap_lock for vm_ops callback paths.
+ * The memory_lock semaphore is used by both code paths calling
+ * into this function to zap vmas and the vm_ops.fault callback
+ * to protect the memory enable state of the device.
+ *
+ * When zapping vmas we need to maintain the mmap_lock => vma_lock
+ * ordering, which requires using vma_lock to walk vma_list to
+ * acquire an mm, then dropping vma_lock to get the mmap_lock and
+ * reacquiring vma_lock. This logic is derived from similar
+ * requirements in uverbs_user_mmap_disassociate().
+ *
+ * mmap_lock must always be the top-level lock when it is taken.
+ * Therefore we can only hold the memory_lock write lock when
+ * vma_list is empty, as we'd need to take mmap_lock to clear
+ * entries. vma_list can only be guaranteed empty when holding
+ * vma_lock, thus memory_lock is nested under vma_lock.
+ *
+ * This enables the vm_ops.fault callback to acquire vma_lock,
+ * followed by memory_lock read lock, while already holding
+ * mmap_lock without risk of deadlock.
+ */
+ while (1) {
+ struct mm_struct *mm = NULL;
+
+ if (try) {
+ if (!mutex_trylock(&vdev->vma_lock))
+ return 0;
+ } else {
+ mutex_lock(&vdev->vma_lock);
+ }
+ while (!list_empty(&vdev->vma_list)) {
+ mmap_vma = list_first_entry(&vdev->vma_list,
+ struct vfio_pci_mmap_vma,
+ vma_next);
+ mm = mmap_vma->vma->vm_mm;
+ if (mmget_not_zero(mm))
+ break;
+
+ list_del(&mmap_vma->vma_next);
+ kfree(mmap_vma);
+ mm = NULL;
+ }
+ if (!mm)
+ return 1;
+ mutex_unlock(&vdev->vma_lock);
+
+ if (try) {
+ if (!mmap_read_trylock(mm)) {
+ mmput(mm);
+ return 0;
+ }
+ } else {
+ mmap_read_lock(mm);
+ }
+ if (try) {
+ if (!mutex_trylock(&vdev->vma_lock)) {
+ mmap_read_unlock(mm);
+ mmput(mm);
+ return 0;
+ }
+ } else {
+ mutex_lock(&vdev->vma_lock);
+ }
+ list_for_each_entry_safe(mmap_vma, tmp,
+ &vdev->vma_list, vma_next) {
+ struct vm_area_struct *vma = mmap_vma->vma;
+
+ if (vma->vm_mm != mm)
+ continue;
+
+ list_del(&mmap_vma->vma_next);
+ kfree(mmap_vma);
+
+ zap_vma_ptes(vma, vma->vm_start,
+ vma->vm_end - vma->vm_start);
+ }
+ mutex_unlock(&vdev->vma_lock);
+ mmap_read_unlock(mm);
+ mmput(mm);
+ }
+}
+
+void vfio_pci_zap_and_down_write_memory_lock(struct vfio_pci_device *vdev)
+{
+ vfio_pci_zap_and_vma_lock(vdev, false);
+ down_write(&vdev->memory_lock);
+ mutex_unlock(&vdev->vma_lock);
+}
+
+u16 vfio_pci_memory_lock_and_enable(struct vfio_pci_device *vdev)
+{
+ u16 cmd;
+
+ down_write(&vdev->memory_lock);
+ pci_read_config_word(vdev->pdev, PCI_COMMAND, &cmd);
+ if (!(cmd & PCI_COMMAND_MEMORY))
+ pci_write_config_word(vdev->pdev, PCI_COMMAND,
+ cmd | PCI_COMMAND_MEMORY);
+
+ return cmd;
+}
+
+void vfio_pci_memory_unlock_and_restore(struct vfio_pci_device *vdev, u16 cmd)
+{
+ pci_write_config_word(vdev->pdev, PCI_COMMAND, cmd);
+ up_write(&vdev->memory_lock);
+}
+
+/* Caller holds vma_lock */
+static int __vfio_pci_add_vma(struct vfio_pci_device *vdev,
+ struct vm_area_struct *vma)
+{
+ struct vfio_pci_mmap_vma *mmap_vma;
+
+ mmap_vma = kmalloc(sizeof(*mmap_vma), GFP_KERNEL);
+ if (!mmap_vma)
+ return -ENOMEM;
+
+ mmap_vma->vma = vma;
+ list_add(&mmap_vma->vma_next, &vdev->vma_list);
+
+ return 0;
+}
+
+/*
+ * Zap mmaps on open so that we can fault them in on access and therefore
+ * our vma_list only tracks mappings accessed since last zap.
+ */
+static void vfio_pci_mmap_open(struct vm_area_struct *vma)
+{
+ zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
+}
+
+static void vfio_pci_mmap_close(struct vm_area_struct *vma)
+{
+ struct vfio_pci_device *vdev = vma->vm_private_data;
+ struct vfio_pci_mmap_vma *mmap_vma;
+
+ mutex_lock(&vdev->vma_lock);
+ list_for_each_entry(mmap_vma, &vdev->vma_list, vma_next) {
+ if (mmap_vma->vma == vma) {
+ list_del(&mmap_vma->vma_next);
+ kfree(mmap_vma);
+ break;
+ }
+ }
+ mutex_unlock(&vdev->vma_lock);
+}
+
+static vm_fault_t vfio_pci_mmap_fault(struct vm_fault *vmf)
+{
+ struct vm_area_struct *vma = vmf->vma;
+ struct vfio_pci_device *vdev = vma->vm_private_data;
+ struct vfio_pci_mmap_vma *mmap_vma;
+ vm_fault_t ret = VM_FAULT_NOPAGE;
+
+ mutex_lock(&vdev->vma_lock);
+ down_read(&vdev->memory_lock);
+
+ if (!__vfio_pci_memory_enabled(vdev)) {
+ ret = VM_FAULT_SIGBUS;
+ goto up_out;
+ }
+
+ /*
+ * We populate the whole vma on fault, so we need to test whether
+ * the vma has already been mapped, such as for concurrent faults
+ * to the same vma. io_remap_pfn_range() will trigger a BUG_ON if
+ * we ask it to fill the same range again.
+ */
+ list_for_each_entry(mmap_vma, &vdev->vma_list, vma_next) {
+ if (mmap_vma->vma == vma)
+ goto up_out;
+ }
+
+ if (io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+ vma->vm_end - vma->vm_start,
+ vma->vm_page_prot)) {
+ ret = VM_FAULT_SIGBUS;
+ zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
+ goto up_out;
+ }
+
+ if (__vfio_pci_add_vma(vdev, vma)) {
+ ret = VM_FAULT_OOM;
+ zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
+ }
+
+up_out:
+ up_read(&vdev->memory_lock);
+ mutex_unlock(&vdev->vma_lock);
+ return ret;
+}
+
+static const struct vm_operations_struct vfio_pci_mmap_ops = {
+ .open = vfio_pci_mmap_open,
+ .close = vfio_pci_mmap_close,
+ .fault = vfio_pci_mmap_fault,
+};
+
+static int vfio_pci_mmap(struct vfio_device *core_vdev, struct vm_area_struct *vma)
+{
+ struct vfio_pci_device *vdev =
+ container_of(core_vdev, struct vfio_pci_device, vdev);
+ struct pci_dev *pdev = vdev->pdev;
+ unsigned int index;
+ u64 phys_len, req_len, pgoff, req_start;
+ int ret;
+
+ index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
+
+ if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions)
+ return -EINVAL;
+ if (vma->vm_end < vma->vm_start)
+ return -EINVAL;
+ if ((vma->vm_flags & VM_SHARED) == 0)
+ return -EINVAL;
+ if (index >= VFIO_PCI_NUM_REGIONS) {
+ int regnum = index - VFIO_PCI_NUM_REGIONS;
+ struct vfio_pci_region *region = vdev->region + regnum;
+
+ if (region->ops && region->ops->mmap &&
+ (region->flags & VFIO_REGION_INFO_FLAG_MMAP))
+ return region->ops->mmap(vdev, region, vma);
+ return -EINVAL;
+ }
+ if (index >= VFIO_PCI_ROM_REGION_INDEX)
+ return -EINVAL;
+ if (!vdev->bar_mmap_supported[index])
+ return -EINVAL;
+
+ phys_len = PAGE_ALIGN(pci_resource_len(pdev, index));
+ req_len = vma->vm_end - vma->vm_start;
+ pgoff = vma->vm_pgoff &
+ ((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
+ req_start = pgoff << PAGE_SHIFT;
+
+ if (req_start + req_len > phys_len)
+ return -EINVAL;
+
+ /*
+ * Even though we don't make use of the barmap for the mmap,
+ * we need to request the region and the barmap tracks that.
+ */
+ if (!vdev->barmap[index]) {
+ ret = pci_request_selected_regions(pdev,
+ 1 << index, "vfio-pci");
+ if (ret)
+ return ret;
+
+ vdev->barmap[index] = pci_iomap(pdev, index, 0);
+ if (!vdev->barmap[index]) {
+ pci_release_selected_regions(pdev, 1 << index);
+ return -ENOMEM;
+ }
+ }
+
+ vma->vm_private_data = vdev;
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff;
+
+ /*
+ * See remap_pfn_range(), called from vfio_pci_fault() but we can't
+ * change vm_flags within the fault handler. Set them now.
+ */
+ vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
+ vma->vm_ops = &vfio_pci_mmap_ops;
+
+ return 0;
+}
+
+static void vfio_pci_request(struct vfio_device *core_vdev, unsigned int count)
+{
+ struct vfio_pci_device *vdev =
+ container_of(core_vdev, struct vfio_pci_device, vdev);
+ struct pci_dev *pdev = vdev->pdev;
+
+ mutex_lock(&vdev->igate);
+
+ if (vdev->req_trigger) {
+ if (!(count % 10))
+ pci_notice_ratelimited(pdev,
+ "Relaying device request to user (#%u)\n",
+ count);
+ eventfd_signal(vdev->req_trigger, 1);
+ } else if (count == 0) {
+ pci_warn(pdev,
+ "No device request channel registered, blocked until released by user\n");
+ }
+
+ mutex_unlock(&vdev->igate);
+}
+
+static int vfio_pci_validate_vf_token(struct vfio_pci_device *vdev,
+ bool vf_token, uuid_t *uuid)
+{
+ /*
+ * There's always some degree of trust or collaboration between SR-IOV
+ * PF and VFs, even if just that the PF hosts the SR-IOV capability and
+ * can disrupt VFs with a reset, but often the PF has more explicit
+ * access to deny service to the VF or access data passed through the
+ * VF. We therefore require an opt-in via a shared VF token (UUID) to
+ * represent this trust. This both prevents that a VF driver might
+ * assume the PF driver is a trusted, in-kernel driver, and also that
+ * a PF driver might be replaced with a rogue driver, unknown to in-use
+ * VF drivers.
+ *
+ * Therefore when presented with a VF, if the PF is a vfio device and
+ * it is bound to the vfio-pci driver, the user needs to provide a VF
+ * token to access the device, in the form of appending a vf_token to
+ * the device name, for example:
+ *
+ * "0000:04:10.0 vf_token=bd8d9d2b-5a5f-4f5a-a211-f591514ba1f3"
+ *
+ * When presented with a PF which has VFs in use, the user must also
+ * provide the current VF token to prove collaboration with existing
+ * VF users. If VFs are not in use, the VF token provided for the PF
+ * device will act to set the VF token.
+ *
+ * If the VF token is provided but unused, an error is generated.
+ */
+ if (!vdev->pdev->is_virtfn && !vdev->vf_token && !vf_token)
+ return 0; /* No VF token provided or required */
+
+ if (vdev->pdev->is_virtfn) {
+ struct vfio_pci_device *pf_vdev = get_pf_vdev(vdev);
+ bool match;
+
+ if (!pf_vdev) {
+ if (!vf_token)
+ return 0; /* PF is not vfio-pci, no VF token */
+
+ pci_info_ratelimited(vdev->pdev,
+ "VF token incorrectly provided, PF not bound to vfio-pci\n");
+ return -EINVAL;
+ }
+
+ if (!vf_token) {
+ vfio_device_put(&pf_vdev->vdev);
+ pci_info_ratelimited(vdev->pdev,
+ "VF token required to access device\n");
+ return -EACCES;
+ }
+
+ mutex_lock(&pf_vdev->vf_token->lock);
+ match = uuid_equal(uuid, &pf_vdev->vf_token->uuid);
+ mutex_unlock(&pf_vdev->vf_token->lock);
+
+ vfio_device_put(&pf_vdev->vdev);
+
+ if (!match) {
+ pci_info_ratelimited(vdev->pdev,
+ "Incorrect VF token provided for device\n");
+ return -EACCES;
+ }
+ } else if (vdev->vf_token) {
+ mutex_lock(&vdev->vf_token->lock);
+ if (vdev->vf_token->users) {
+ if (!vf_token) {
+ mutex_unlock(&vdev->vf_token->lock);
+ pci_info_ratelimited(vdev->pdev,
+ "VF token required to access device\n");
+ return -EACCES;
+ }
+
+ if (!uuid_equal(uuid, &vdev->vf_token->uuid)) {
+ mutex_unlock(&vdev->vf_token->lock);
+ pci_info_ratelimited(vdev->pdev,
+ "Incorrect VF token provided for device\n");
+ return -EACCES;
+ }
+ } else if (vf_token) {
+ uuid_copy(&vdev->vf_token->uuid, uuid);
+ }
+
+ mutex_unlock(&vdev->vf_token->lock);
+ } else if (vf_token) {
+ pci_info_ratelimited(vdev->pdev,
+ "VF token incorrectly provided, not a PF or VF\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+#define VF_TOKEN_ARG "vf_token="
+
+static int vfio_pci_match(struct vfio_device *core_vdev, char *buf)
+{
+ struct vfio_pci_device *vdev =
+ container_of(core_vdev, struct vfio_pci_device, vdev);
+ bool vf_token = false;
+ uuid_t uuid;
+ int ret;
+
+ if (strncmp(pci_name(vdev->pdev), buf, strlen(pci_name(vdev->pdev))))
+ return 0; /* No match */
+
+ if (strlen(buf) > strlen(pci_name(vdev->pdev))) {
+ buf += strlen(pci_name(vdev->pdev));
+
+ if (*buf != ' ')
+ return 0; /* No match: non-whitespace after name */
+
+ while (*buf) {
+ if (*buf == ' ') {
+ buf++;
+ continue;
+ }
+
+ if (!vf_token && !strncmp(buf, VF_TOKEN_ARG,
+ strlen(VF_TOKEN_ARG))) {
+ buf += strlen(VF_TOKEN_ARG);
+
+ if (strlen(buf) < UUID_STRING_LEN)
+ return -EINVAL;
+
+ ret = uuid_parse(buf, &uuid);
+ if (ret)
+ return ret;
+
+ vf_token = true;
+ buf += UUID_STRING_LEN;
+ } else {
+ /* Unknown/duplicate option */
+ return -EINVAL;
+ }
+ }
+ }
+
+ ret = vfio_pci_validate_vf_token(vdev, vf_token, &uuid);
+ if (ret)
+ return ret;
+
+ return 1; /* Match */
+}
+
+static const struct vfio_device_ops vfio_pci_ops = {
+ .name = "vfio-pci",
+ .open_device = vfio_pci_open_device,
+ .close_device = vfio_pci_close_device,
+ .ioctl = vfio_pci_ioctl,
+ .read = vfio_pci_read,
+ .write = vfio_pci_write,
+ .mmap = vfio_pci_mmap,
+ .request = vfio_pci_request,
+ .match = vfio_pci_match,
+};
+
+static int vfio_pci_bus_notifier(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct vfio_pci_device *vdev = container_of(nb,
+ struct vfio_pci_device, nb);
+ struct device *dev = data;
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct pci_dev *physfn = pci_physfn(pdev);
+
+ if (action == BUS_NOTIFY_ADD_DEVICE &&
+ pdev->is_virtfn && physfn == vdev->pdev) {
+ pci_info(vdev->pdev, "Captured SR-IOV VF %s driver_override\n",
+ pci_name(pdev));
+ pdev->driver_override = kasprintf(GFP_KERNEL, "%s",
+ vfio_pci_ops.name);
+ } else if (action == BUS_NOTIFY_BOUND_DRIVER &&
+ pdev->is_virtfn && physfn == vdev->pdev) {
+ struct pci_driver *drv = pci_dev_driver(pdev);
+
+ if (drv && drv != &vfio_pci_driver)
+ pci_warn(vdev->pdev,
+ "VF %s bound to driver %s while PF bound to vfio-pci\n",
+ pci_name(pdev), drv->name);
+ }
+
+ return 0;
+}
+
+static int vfio_pci_vf_init(struct vfio_pci_device *vdev)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ int ret;
+
+ if (!pdev->is_physfn)
+ return 0;
+
+ vdev->vf_token = kzalloc(sizeof(*vdev->vf_token), GFP_KERNEL);
+ if (!vdev->vf_token)
+ return -ENOMEM;
+
+ mutex_init(&vdev->vf_token->lock);
+ uuid_gen(&vdev->vf_token->uuid);
+
+ vdev->nb.notifier_call = vfio_pci_bus_notifier;
+ ret = bus_register_notifier(&pci_bus_type, &vdev->nb);
+ if (ret) {
+ kfree(vdev->vf_token);
+ return ret;
+ }
+ return 0;
+}
+
+static void vfio_pci_vf_uninit(struct vfio_pci_device *vdev)
+{
+ if (!vdev->vf_token)
+ return;
+
+ bus_unregister_notifier(&pci_bus_type, &vdev->nb);
+ WARN_ON(vdev->vf_token->users);
+ mutex_destroy(&vdev->vf_token->lock);
+ kfree(vdev->vf_token);
+}
+
+static int vfio_pci_vga_init(struct vfio_pci_device *vdev)
+{
+ struct pci_dev *pdev = vdev->pdev;
+ int ret;
+
+ if (!vfio_pci_is_vga(pdev))
+ return 0;
+
+ ret = vga_client_register(pdev, vfio_pci_set_decode);
+ if (ret)
+ return ret;
+ vga_set_legacy_decoding(pdev, vfio_pci_set_decode(pdev, false));
+ return 0;
+}
+
+static void vfio_pci_vga_uninit(struct vfio_pci_device *vdev)
+{
+ struct pci_dev *pdev = vdev->pdev;
+
+ if (!vfio_pci_is_vga(pdev))
+ return;
+ vga_client_register(pdev, NULL);
+ vga_set_legacy_decoding(pdev, VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
+ VGA_RSRC_LEGACY_IO |
+ VGA_RSRC_LEGACY_MEM);
+}
+
+static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ struct vfio_pci_device *vdev;
+ struct iommu_group *group;
+ int ret;
+
+ if (vfio_pci_is_denylisted(pdev))
+ return -EINVAL;
+
+ if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL)
+ return -EINVAL;
+
+ /*
+ * Prevent binding to PFs with VFs enabled, the VFs might be in use
+ * by the host or other users. We cannot capture the VFs if they
+ * already exist, nor can we track VF users. Disabling SR-IOV here
+ * would initiate removing the VFs, which would unbind the driver,
+ * which is prone to blocking if that VF is also in use by vfio-pci.
+ * Just reject these PFs and let the user sort it out.
+ */
+ if (pci_num_vf(pdev)) {
+ pci_warn(pdev, "Cannot bind to PF with SR-IOV enabled\n");
+ return -EBUSY;
+ }
+
+ group = vfio_iommu_group_get(&pdev->dev);
+ if (!group)
+ return -EINVAL;
+
+ vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
+ if (!vdev) {
+ ret = -ENOMEM;
+ goto out_group_put;
+ }
+
+ vfio_init_group_dev(&vdev->vdev, &pdev->dev, &vfio_pci_ops);
+ vdev->pdev = pdev;
+ vdev->irq_type = VFIO_PCI_NUM_IRQS;
+ mutex_init(&vdev->igate);
+ spin_lock_init(&vdev->irqlock);
+ mutex_init(&vdev->ioeventfds_lock);
+ INIT_LIST_HEAD(&vdev->dummy_resources_list);
+ INIT_LIST_HEAD(&vdev->ioeventfds_list);
+ mutex_init(&vdev->vma_lock);
+ INIT_LIST_HEAD(&vdev->vma_list);
+ init_rwsem(&vdev->memory_lock);
+
+ if (pci_is_root_bus(pdev->bus)) {
+ ret = vfio_assign_device_set(&vdev->vdev, vdev);
+ } else if (!pci_probe_reset_slot(pdev->slot)) {
+ ret = vfio_assign_device_set(&vdev->vdev, pdev->slot);
+ } else {
+ /*
+ * If there is no slot reset support for this device, the whole
+ * bus needs to be grouped together to support bus-wide resets.
+ */
+ ret = vfio_assign_device_set(&vdev->vdev, pdev->bus);
+ }
+
+ if (ret)
+ goto out_uninit;
+ ret = vfio_pci_vf_init(vdev);
+ if (ret)
+ goto out_uninit;
+ ret = vfio_pci_vga_init(vdev);
+ if (ret)
+ goto out_vf;
+
+ vfio_pci_probe_power_state(vdev);
+
+ if (!disable_idle_d3) {
+ /*
+ * pci-core sets the device power state to an unknown value at
+ * bootup and after being removed from a driver. The only
+ * transition it allows from this unknown state is to D0, which
+ * typically happens when a driver calls pci_enable_device().
+ * We're not ready to enable the device yet, but we do want to
+ * be able to get to D3. Therefore first do a D0 transition
+ * before going to D3.
+ */
+ vfio_pci_set_power_state(vdev, PCI_D0);
+ vfio_pci_set_power_state(vdev, PCI_D3hot);
+ }
+
+ ret = vfio_register_group_dev(&vdev->vdev);
+ if (ret)
+ goto out_power;
+ dev_set_drvdata(&pdev->dev, vdev);
+ return 0;
+
+out_power:
+ if (!disable_idle_d3)
+ vfio_pci_set_power_state(vdev, PCI_D0);
+out_vf:
+ vfio_pci_vf_uninit(vdev);
+out_uninit:
+ vfio_uninit_group_dev(&vdev->vdev);
+ kfree(vdev->pm_save);
+ kfree(vdev);
+out_group_put:
+ vfio_iommu_group_put(group, &pdev->dev);
+ return ret;
+}
+
+static void vfio_pci_remove(struct pci_dev *pdev)
+{
+ struct vfio_pci_device *vdev = dev_get_drvdata(&pdev->dev);
+
+ pci_disable_sriov(pdev);
+
+ vfio_unregister_group_dev(&vdev->vdev);
+
+ vfio_pci_vf_uninit(vdev);
+ vfio_uninit_group_dev(&vdev->vdev);
+ vfio_pci_vga_uninit(vdev);
+
+ vfio_iommu_group_put(pdev->dev.iommu_group, &pdev->dev);
+
+ if (!disable_idle_d3)
+ vfio_pci_set_power_state(vdev, PCI_D0);
+
+ mutex_destroy(&vdev->ioeventfds_lock);
+ kfree(vdev->region);
+ kfree(vdev->pm_save);
+ kfree(vdev);
+}
+
+static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev,
+ pci_channel_state_t state)
+{
+ struct vfio_pci_device *vdev;
+ struct vfio_device *device;
+
+ device = vfio_device_get_from_dev(&pdev->dev);
+ if (device == NULL)
+ return PCI_ERS_RESULT_DISCONNECT;
+
+ vdev = container_of(device, struct vfio_pci_device, vdev);
+
+ mutex_lock(&vdev->igate);
+
+ if (vdev->err_trigger)
+ eventfd_signal(vdev->err_trigger, 1);
+
+ mutex_unlock(&vdev->igate);
+
+ vfio_device_put(device);
+
+ return PCI_ERS_RESULT_CAN_RECOVER;
+}
+
+static int vfio_pci_sriov_configure(struct pci_dev *pdev, int nr_virtfn)
+{
+ struct vfio_device *device;
+ int ret = 0;
+
+ might_sleep();
+
+ if (!enable_sriov)
+ return -ENOENT;
+
+ device = vfio_device_get_from_dev(&pdev->dev);
+ if (!device)
+ return -ENODEV;
+
+ if (nr_virtfn == 0)
+ pci_disable_sriov(pdev);
+ else
+ ret = pci_enable_sriov(pdev, nr_virtfn);
+
+ vfio_device_put(device);
+
+ return ret < 0 ? ret : nr_virtfn;
+}
+
+static const struct pci_error_handlers vfio_err_handlers = {
+ .error_detected = vfio_pci_aer_err_detected,
+};
+
+static struct pci_driver vfio_pci_driver = {
+ .name = "vfio-pci",
+ .id_table = NULL, /* only dynamic ids */
+ .probe = vfio_pci_probe,
+ .remove = vfio_pci_remove,
+ .sriov_configure = vfio_pci_sriov_configure,
+ .err_handler = &vfio_err_handlers,
+};
+
+static bool vfio_dev_in_groups(struct vfio_pci_device *vdev,
+ struct vfio_pci_group_info *groups)
+{
+ unsigned int i;
+
+ for (i = 0; i < groups->count; i++)
+ if (groups->groups[i] == vdev->vdev.group)
+ return true;
+ return false;
+}
+
+static int vfio_pci_is_device_in_set(struct pci_dev *pdev, void *data)
+{
+ struct vfio_device_set *dev_set = data;
+ struct vfio_device *cur;
+
+ list_for_each_entry(cur, &dev_set->device_list, dev_set_list)
+ if (cur->dev == &pdev->dev)
+ return 0;
+ return -EBUSY;
+}
+
+/*
+ * vfio-core considers a group to be viable and will create a vfio_device even
+ * if some devices are bound to drivers like pci-stub or pcieport. Here we
+ * require all PCI devices to be inside our dev_set since that ensures they stay
+ * put and that every driver controlling the device can co-ordinate with the
+ * device reset.
+ *
+ * Returns the pci_dev to pass to pci_reset_bus() if every PCI device to be
+ * reset is inside the dev_set, and pci_reset_bus() can succeed. NULL otherwise.
+ */
+static struct pci_dev *
+vfio_pci_dev_set_resettable(struct vfio_device_set *dev_set)
+{
+ struct pci_dev *pdev;
+
+ lockdep_assert_held(&dev_set->lock);
+
+ /*
+ * By definition all PCI devices in the dev_set share the same PCI
+ * reset, so any pci_dev will have the same outcomes for
+ * pci_probe_reset_*() and pci_reset_bus().
+ */
+ pdev = list_first_entry(&dev_set->device_list, struct vfio_pci_device,
+ vdev.dev_set_list)->pdev;
+
+ /* pci_reset_bus() is supported */
+ if (pci_probe_reset_slot(pdev->slot) && pci_probe_reset_bus(pdev->bus))
+ return NULL;
+
+ if (vfio_pci_for_each_slot_or_bus(pdev, vfio_pci_is_device_in_set,
+ dev_set,
+ !pci_probe_reset_slot(pdev->slot)))
+ return NULL;
+ return pdev;
+}
+
+/*
+ * We need to get memory_lock for each device, but devices can share mmap_lock,
+ * therefore we need to zap and hold the vma_lock for each device, and only then
+ * get each memory_lock.
+ */
+static int vfio_pci_dev_set_hot_reset(struct vfio_device_set *dev_set,
+ struct vfio_pci_group_info *groups)
+{
+ struct vfio_pci_device *cur_mem;
+ struct vfio_pci_device *cur_vma;
+ struct vfio_pci_device *cur;
+ struct pci_dev *pdev;
+ bool is_mem = true;
+ int ret;
+
+ mutex_lock(&dev_set->lock);
+ cur_mem = list_first_entry(&dev_set->device_list,
+ struct vfio_pci_device, vdev.dev_set_list);
+
+ pdev = vfio_pci_dev_set_resettable(dev_set);
+ if (!pdev) {
+ ret = -EINVAL;
+ goto err_unlock;
+ }
+
+ list_for_each_entry(cur_vma, &dev_set->device_list, vdev.dev_set_list) {
+ /*
+ * Test whether all the affected devices are contained by the
+ * set of groups provided by the user.
+ */
+ if (!vfio_dev_in_groups(cur_vma, groups)) {
+ ret = -EINVAL;
+ goto err_undo;
+ }
+
+ /*
+ * Locking multiple devices is prone to deadlock, runaway and
+ * unwind if we hit contention.
+ */
+ if (!vfio_pci_zap_and_vma_lock(cur_vma, true)) {
+ ret = -EBUSY;
+ goto err_undo;
+ }
+ }
+ cur_vma = NULL;
+
+ list_for_each_entry(cur_mem, &dev_set->device_list, vdev.dev_set_list) {
+ if (!down_write_trylock(&cur_mem->memory_lock)) {
+ ret = -EBUSY;
+ goto err_undo;
+ }
+ mutex_unlock(&cur_mem->vma_lock);
+ }
+ cur_mem = NULL;
+
+ ret = pci_reset_bus(pdev);
+
+err_undo:
+ list_for_each_entry(cur, &dev_set->device_list, vdev.dev_set_list) {
+ if (cur == cur_mem)
+ is_mem = false;
+ if (cur == cur_vma)
+ break;
+ if (is_mem)
+ up_write(&cur->memory_lock);
+ else
+ mutex_unlock(&cur->vma_lock);
+ }
+err_unlock:
+ mutex_unlock(&dev_set->lock);
+ return ret;
+}
+
+static bool vfio_pci_dev_set_needs_reset(struct vfio_device_set *dev_set)
+{
+ struct vfio_pci_device *cur;
+ bool needs_reset = false;
+
+ list_for_each_entry(cur, &dev_set->device_list, vdev.dev_set_list) {
+ /* No VFIO device in the set can have an open device FD */
+ if (cur->vdev.open_count)
+ return false;
+ needs_reset |= cur->needs_reset;
+ }
+ return needs_reset;
+}
+
+/*
+ * If a bus or slot reset is available for the provided dev_set and:
+ * - All of the devices affected by that bus or slot reset are unused
+ * - At least one of the affected devices is marked dirty via
+ * needs_reset (such as by lack of FLR support)
+ * Then attempt to perform that bus or slot reset.
+ * Returns true if the dev_set was reset.
+ */
+static bool vfio_pci_dev_set_try_reset(struct vfio_device_set *dev_set)
+{
+ struct vfio_pci_device *cur;
+ struct pci_dev *pdev;
+ int ret;
+
+ if (!vfio_pci_dev_set_needs_reset(dev_set))
+ return false;
+
+ pdev = vfio_pci_dev_set_resettable(dev_set);
+ if (!pdev)
+ return false;
+
+ ret = pci_reset_bus(pdev);
+ if (ret)
+ return false;
+
+ list_for_each_entry(cur, &dev_set->device_list, vdev.dev_set_list) {
+ cur->needs_reset = false;
+ if (!disable_idle_d3)
+ vfio_pci_set_power_state(cur, PCI_D3hot);
+ }
+ return true;
+}
+
+static void __exit vfio_pci_cleanup(void)
+{
+ pci_unregister_driver(&vfio_pci_driver);
+ vfio_pci_uninit_perm_bits();
+}
+
+static void __init vfio_pci_fill_ids(void)
+{
+ char *p, *id;
+ int rc;
+
+ /* no ids passed actually */
+ if (ids[0] == '\0')
+ return;
+
+ /* add ids specified in the module parameter */
+ p = ids;
+ while ((id = strsep(&p, ","))) {
+ unsigned int vendor, device, subvendor = PCI_ANY_ID,
+ subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
+ int fields;
+
+ if (!strlen(id))
+ continue;
+
+ fields = sscanf(id, "%x:%x:%x:%x:%x:%x",
+ &vendor, &device, &subvendor, &subdevice,
+ &class, &class_mask);
+
+ if (fields < 2) {
+ pr_warn("invalid id string \"%s\"\n", id);
+ continue;
+ }
+
+ rc = pci_add_dynid(&vfio_pci_driver, vendor, device,
+ subvendor, subdevice, class, class_mask, 0);
+ if (rc)
+ pr_warn("failed to add dynamic id [%04x:%04x[%04x:%04x]] class %#08x/%08x (%d)\n",
+ vendor, device, subvendor, subdevice,
+ class, class_mask, rc);
+ else
+ pr_info("add [%04x:%04x[%04x:%04x]] class %#08x/%08x\n",
+ vendor, device, subvendor, subdevice,
+ class, class_mask);
+ }
+}
+
+static int __init vfio_pci_init(void)
+{
+ int ret;
+
+ /* Allocate shared config space permission data used by all devices */
+ ret = vfio_pci_init_perm_bits();
+ if (ret)
+ return ret;
+
+ /* Register and scan for devices */
+ ret = pci_register_driver(&vfio_pci_driver);
+ if (ret)
+ goto out_driver;
+
+ vfio_pci_fill_ids();
+
+ if (disable_denylist)
+ pr_warn("device denylist disabled.\n");
+
+ return 0;
+
+out_driver:
+ vfio_pci_uninit_perm_bits();
+ return ret;
+}
+
+module_init(vfio_pci_init);
+module_exit(vfio_pci_cleanup);
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);