From: Matthew Rosato <mjrosato@linux.ibm.com>
Date: Thu, 10 Sep 2020 10:59:55 -0400
Subject: PCI/IOV: Mark VFs as not implementing PCI_COMMAND_MEMORY
Git-commit: 12856e7acde4702b7c3238c15fcba86ff6aa507f
Patch-mainline: v5.10-rc1
References: bsc#1179612

For VFs, the Memory Space Enable bit in the Command Register is
hard-wired to 0.

Add a new bit to signify devices where the Command Register Memory
Space Enable bit does not control the device's response to MMIO
accesses.

Fixes: abafbc551fdd ("vfio-pci: Invalidate mmaps and block MMIO access on disabled memory")
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Joerg Roedel <jroedel@suse.de>
---
 drivers/pci/iov.c   |    1 +
 include/linux/pci.h |    1 +
 2 files changed, 2 insertions(+)

--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -134,6 +134,7 @@ int pci_iov_add_virtfn(struct pci_dev *d
 
 	virtfn->devfn = pci_iov_virtfn_devfn(dev, id);
 	virtfn->vendor = dev->vendor;
+	virtfn->no_command_memory = 1;
 	pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_DID, &virtfn->device);
 	rc = pci_setup_device(virtfn);
 	if (rc)
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -414,6 +414,7 @@ struct pci_dev {
 	unsigned int	has_secondary_link:1;
 	unsigned int	non_compliant_bars:1;	/* broken BARs; ignore them */
 	unsigned int	no_vf_scan:1;		/* Don't scan for VFs after IOV enablement */
+	unsigned int	no_command_memory:1;	/* No PCI_COMMAND_MEMORY */
 	pci_dev_flags_t dev_flags;
 	atomic_t	enable_cnt;	/* pci_enable_device has been called */