From: Alex Williamson <alex.williamson@redhat.com>
Date: Tue, 12 Dec 2017 12:59:39 -0700
Subject: vfio: Simplify capability helper
Git-commit: dda01f787df9f9e46f1c0bf8aa11f246e300750d
Patch-mainline: v4.16-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
The vfio_info_add_capability() helper requires the caller to pass a
capability ID, which it then uses to fill in header fields, assuming
hard coded versions. This makes for an awkward and rigid interface.
The only thing we want this helper to do is allocate sufficient
space in the caps buffer and chain this capability into the list.
Reduce it to that simple task.
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Acked-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Reviewed-by: Kirti Wankhede <kwankhede@nvidia.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/i915/gvt/kvmgt.c | 15 +++++++----
drivers/vfio/pci/vfio_pci.c | 14 ++++++----
drivers/vfio/vfio.c | 52 +++------------------------------------
include/linux/vfio.h | 3 +-
4 files changed, 24 insertions(+), 60 deletions(-)
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -1012,6 +1012,8 @@ static long intel_vgpu_ioctl(struct mdev
if (!sparse)
return -ENOMEM;
+ sparse->header.id = VFIO_REGION_INFO_CAP_SPARSE_MMAP;
+ sparse->header.version = 1;
sparse->nr_areas = nr_areas;
cap_type_id = VFIO_REGION_INFO_CAP_SPARSE_MMAP;
sparse->areas[0].offset =
@@ -1033,7 +1035,9 @@ static long intel_vgpu_ioctl(struct mdev
break;
default:
{
- struct vfio_region_info_cap_type cap_type;
+ 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 +
vgpu->vdev.num_regions)
@@ -1050,8 +1054,8 @@ static long intel_vgpu_ioctl(struct mdev
cap_type.subtype = vgpu->vdev.region[i].subtype;
ret = vfio_info_add_capability(&caps,
- VFIO_REGION_INFO_CAP_TYPE,
- &cap_type);
+ &cap_type.header,
+ sizeof(cap_type));
if (ret)
return ret;
}
@@ -1061,8 +1065,9 @@ static long intel_vgpu_ioctl(struct mdev
switch (cap_type_id) {
case VFIO_REGION_INFO_CAP_SPARSE_MMAP:
ret = vfio_info_add_capability(&caps,
- VFIO_REGION_INFO_CAP_SPARSE_MMAP,
- sparse);
+ &sparse->header, sizeof(*sparse) +
+ (sparse->nr_areas *
+ sizeof(*sparse->areas)));
kfree(sparse);
if (ret)
return ret;
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -575,6 +575,8 @@ static int msix_sparse_mmap_cap(struct v
if (!sparse)
return -ENOMEM;
+ sparse->header.id = VFIO_REGION_INFO_CAP_SPARSE_MMAP;
+ sparse->header.version = 1;
sparse->nr_areas = nr_areas;
if (vdev->msix_offset & PAGE_MASK) {
@@ -590,8 +592,7 @@ static int msix_sparse_mmap_cap(struct v
i++;
}
- ret = vfio_info_add_capability(caps, VFIO_REGION_INFO_CAP_SPARSE_MMAP,
- sparse);
+ ret = vfio_info_add_capability(caps, &sparse->header, size);
kfree(sparse);
return ret;
@@ -734,7 +735,9 @@ static long vfio_pci_ioctl(void *device_
break;
default:
{
- struct vfio_region_info_cap_type cap_type;
+ 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)
@@ -749,9 +752,8 @@ static long vfio_pci_ioctl(void *device_
cap_type.type = vdev->region[i].type;
cap_type.subtype = vdev->region[i].subtype;
- ret = vfio_info_add_capability(&caps,
- VFIO_REGION_INFO_CAP_TYPE,
- &cap_type);
+ ret = vfio_info_add_capability(&caps, &cap_type.header,
+ sizeof(cap_type));
if (ret)
return ret;
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -1836,63 +1836,19 @@ void vfio_info_cap_shift(struct vfio_inf
}
EXPORT_SYMBOL(vfio_info_cap_shift);
-static int sparse_mmap_cap(struct vfio_info_cap *caps, void *cap_type)
+int vfio_info_add_capability(struct vfio_info_cap *caps,
+ struct vfio_info_cap_header *cap, size_t size)
{
struct vfio_info_cap_header *header;
- struct vfio_region_info_cap_sparse_mmap *sparse_cap, *sparse = cap_type;
- size_t size;
- size = sizeof(*sparse) + sparse->nr_areas * sizeof(*sparse->areas);
- header = vfio_info_cap_add(caps, size,
- VFIO_REGION_INFO_CAP_SPARSE_MMAP, 1);
+ header = vfio_info_cap_add(caps, size, cap->id, cap->version);
if (IS_ERR(header))
return PTR_ERR(header);
- sparse_cap = container_of(header,
- struct vfio_region_info_cap_sparse_mmap, header);
- sparse_cap->nr_areas = sparse->nr_areas;
- memcpy(sparse_cap->areas, sparse->areas,
- sparse->nr_areas * sizeof(*sparse->areas));
- return 0;
-}
-
-static int region_type_cap(struct vfio_info_cap *caps, void *cap_type)
-{
- struct vfio_info_cap_header *header;
- struct vfio_region_info_cap_type *type_cap, *cap = cap_type;
-
- header = vfio_info_cap_add(caps, sizeof(*cap),
- VFIO_REGION_INFO_CAP_TYPE, 1);
- if (IS_ERR(header))
- return PTR_ERR(header);
+ memcpy(header + 1, cap + 1, size - sizeof(*header));
- type_cap = container_of(header, struct vfio_region_info_cap_type,
- header);
- type_cap->type = cap->type;
- type_cap->subtype = cap->subtype;
return 0;
}
-
-int vfio_info_add_capability(struct vfio_info_cap *caps, int cap_type_id,
- void *cap_type)
-{
- int ret = -EINVAL;
-
- if (!cap_type)
- return 0;
-
- switch (cap_type_id) {
- case VFIO_REGION_INFO_CAP_SPARSE_MMAP:
- ret = sparse_mmap_cap(caps, cap_type);
- break;
-
- case VFIO_REGION_INFO_CAP_TYPE:
- ret = region_type_cap(caps, cap_type);
- break;
- }
-
- return ret;
-}
EXPORT_SYMBOL(vfio_info_add_capability);
int vfio_set_irqs_validate_and_prepare(struct vfio_irq_set *hdr, int num_irqs,
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -145,7 +145,8 @@ extern struct vfio_info_cap_header *vfio
extern void vfio_info_cap_shift(struct vfio_info_cap *caps, size_t offset);
extern int vfio_info_add_capability(struct vfio_info_cap *caps,
- int cap_type_id, void *cap_type);
+ struct vfio_info_cap_header *cap,
+ size_t size);
extern int vfio_set_irqs_validate_and_prepare(struct vfio_irq_set *hdr,
int num_irqs, int max_irq_type,