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vfio queue:

Browse source 
* Preparatory changes for the introduction of CPR support
 * Automatic enablement of OpRegion for IGD device passthrough
 * Linux headers update
 * Preparatory changes for the introduction of vfio-user
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Merge tag 'pull-vfio-20250509' of https://github.com/legoater/qemu into staging

vfio queue:

* Preparatory changes for the introduction of CPR support
* Automatic enablement of OpRegion for IGD device passthrough
* Linux headers update
* Preparatory changes for the introduction of vfio-user

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* tag 'pull-vfio-20250509' of https://github.com/legoater/qemu: (28 commits)
  vfio/container: pass listener_begin/commit callbacks
  vfio: add vfio-pci-base class
  vfio: add read/write to device IO ops vector
  vfio: add region info cache
  vfio: add device IO ops vector
  vfio: implement unmap all for DMA unmap callbacks
  vfio: add unmap_all flag to DMA unmap callback
  vfio: add vfio_pci_config_space_read/write()
  vfio: add strread/writeerror()
  vfio: consistently handle return value for helpers
  vfio: add vfio_device_get_irq_info() helper
  vfio: add vfio_attach_device_by_iommu_type()
  vfio: add vfio_device_unprepare()
  vfio: add vfio_device_prepare()
  linux-headers: Update to Linux v6.15-rc3
  linux-header: update-linux-header script changes
  vfio/igd: Remove generation limitation for IGD passthrough
  vfio/igd: Only emulate GGC register when x-igd-gms is set
  vfio/igd: Allow overriding GMS with 0xf0 to 0xfe on Gen9+
  vfio/igd: Enable OpRegion by default
  ...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2025-05-09 12:04:34 -04:00
commit 7be29f2f1a
50 changed files with 1083 additions and 405 deletions
Download patch file Download diff file Expand all files Collapse all files

11
docs/igd-assign.txt
View file

@ -47,6 +47,7 @@ Intel document [1] shows how to dump VBIOS to file. For UEFI Option ROM, see
QEMU also provides a "Legacy" mode that implicitly enables full functionality
on IGD, it is automatically enabled when
* IGD generation is 6 to 9 (Sandy Bridge to Comet Lake)
* Machine type is i440fx
* IGD is assigned to guest BDF 00:02.0
* ROM BAR or romfile is present
@ -101,7 +102,7 @@ digital formats work well.
Options
=======
* x-igd-opregion=[on|*off*]
* x-igd-opregion=[*on*|off]
Copy host IGD OpRegion and expose it to guest with fw_cfg
* x-igd-lpc=[on|*off*]
@ -123,7 +124,7 @@ Examples
* Adding IGD with OpRegion and LPC ID hack, but without VGA ranges
(For UEFI guests)
-device vfio-pci,host=00:02.0,id=hostdev0,addr=2.0,x-igd-legacy-mode=off,x-igd-opregion=on,x-igd-lpc=on,romfile=efi_oprom.rom
-device vfio-pci,host=00:02.0,id=hostdev0,addr=2.0,x-igd-legacy-mode=off,x-igd-lpc=on,romfile=efi_oprom.rom
Guest firmware
@ -156,6 +157,12 @@ fw_cfg requirements on the VM firmware:
it's expected that this fw_cfg file is only relevant to a single PCI
class VGA device with Intel vendor ID, appearing at PCI bus address 00:02.0.
Starting from Meteor Lake, IGD devices access stolen memory via its MMIO
BAR2 (LMEMBAR) and removed the BDSM register in config space. There is
no need for guest firmware to allocate data stolen memory in guest address
space and write it to BDSM register. Value of this fw_cfg file is 0 in
such case.
Upstream Seabios has OpRegion and BDSM (pre-Gen11 device only) support.
However, the support is not accepted by upstream EDK2/OVMF. A recommended
solution is to create a virtual OpRom with following DXE drivers: