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| author | Tomita Moeko <tomitamoeko@gmail.com> | 2025-01-04 23:42:17 +0800 |
|---|---|---|
| committer | Cédric Le Goater <clg@redhat.com> | 2025-02-11 14:15:19 +0100 |
| commit | f36e7ba9750cbeffdc465c2d195a232d7cb67555 (patch) | |
| tree | 8ec6d8540522d615eaee6174b003cdabd56a5f2e | |
| parent | dee69a8ca6ebc325939dc0b6800becdb26cd9dbf (diff) | |
| download | qemu-f36e7ba9750cbeffdc465c2d195a232d7cb67555.zip qemu-f36e7ba9750cbeffdc465c2d195a232d7cb67555.tar.gz qemu-f36e7ba9750cbeffdc465c2d195a232d7cb67555.tar.bz2 | |
vfio/pci: introduce config_offset field in VFIOConfigMirrorQuirk
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>
| -rw-r--r-- | hw/vfio/pci-quirks.c | 2 | ||||
| -rw-r--r-- | hw/vfio/pci-quirks.h | 3 |
2 files changed, 4 insertions, 1 deletions
diff --git a/hw/vfio/pci-quirks.c b/hw/vfio/pci-quirks.c index 2258fdd..fbe43b0 100644 --- a/hw/vfio/pci-quirks.c +++ b/hw/vfio/pci-quirks.c @@ -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), diff --git a/hw/vfio/pci-quirks.h b/hw/vfio/pci-quirks.h index c0e96a0..d1532e3 100644 --- a/hw/vfio/pci-quirks.h +++ b/hw/vfio/pci-quirks.h @@ -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[]; |