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vfio/pci: introduce config_offset field in VFIOConfigMirrorQuirk

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Device may only expose a specific portion of PCI config space through a
region in a BAR, such behavior is seen in igd GGC and BDSM mirrors in
BAR0. To handle these, config_offset is introduced to allow mirroring
arbitrary region in PCI config space.

Signed-off-by: Tomita Moeko <tomitamoeko@gmail.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Link: https://lore.kernel.org/r/20250104154219.7209-3-tomitamoeko@gmail.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Tomita Moeko 2025-01-04 23:42:17 +08:00 • committed by Cédric Le Goater
parent dee69a8ca6
commit f36e7ba975
2 changed files with 4 additions and 1 deletions
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2
hw/vfio/pci-quirks.c
View file

@ -162,6 +162,7 @@ static uint64_t vfio_generic_quirk_mirror_read(void *opaque,
(void)vfio_region_read(&vdev->bars[mirror->bar].region,
addr + mirror->offset, size);
addr += mirror->config_offset;
data = vfio_pci_read_config(&vdev->pdev, addr, size);
trace_vfio_quirk_generic_mirror_read(vdev->vbasedev.name,
memory_region_name(mirror->mem),
@ -175,6 +176,7 @@ static void vfio_generic_quirk_mirror_write(void *opaque, hwaddr addr,
VFIOConfigMirrorQuirk *mirror = opaque;
VFIOPCIDevice *vdev = mirror->vdev;
addr += mirror->config_offset;
vfio_pci_write_config(&vdev->pdev, addr, data, size);
trace_vfio_quirk_generic_mirror_write(vdev->vbasedev.name,
memory_region_name(mirror->mem),

3
hw/vfio/pci-quirks.h
View file

@ -60,7 +60,8 @@ extern const MemoryRegionOps vfio_generic_window_data_quirk;
*/
typedef struct VFIOConfigMirrorQuirk {
struct VFIOPCIDevice *vdev;
uint32_t offset;
uint32_t offset; /* Offset in BAR */
uint32_t config_offset; /* Offset in PCI config space */
uint8_t bar;
MemoryRegion *mem;
uint8_t data[];