diff options
| author | Tomita Moeko <tomitamoeko@gmail.com> | 2025-07-24 00:09:05 +0800 |
|---|---|---|
| committer | Cédric Le Goater <clg@redhat.com> | 2025-07-28 17:52:34 +0200 |
| commit | e0b33efe2acc3c6c651bb761394ef597e763e349 (patch) | |
| tree | 0ef26c26d27baabb2ace6de1fdfb82b744be636a /docs | |
| parent | 9751377c3a9445f597c5d0bf134a79c8cb58e45d (diff) | |
| download | qemu-e0b33efe2acc3c6c651bb761394ef597e763e349.zip qemu-e0b33efe2acc3c6c651bb761394ef597e763e349.tar.gz qemu-e0b33efe2acc3c6c651bb761394ef597e763e349.tar.bz2 | |
vfio/igd: Require host VGA decode for legacy mode
Commit a59d06305fff ("vfio/pci: Introduce x-pci-class-code option")
allows user to expose non-VGA IGD device as VGA controller to the
guest. However, legacy mode requires host VGA range access. Check
that GGC.IVD == 0 before enabling legacy mode to ensure IGD is a real
VGA device claiming host VGA ranges.
Signed-off-by: Tomita Moeko <tomitamoeko@gmail.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250723160906.44941-2-tomitamoeko@gmail.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/igd-assign.txt | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/docs/igd-assign.txt b/docs/igd-assign.txt index af4e839..e540403 100644 --- a/docs/igd-assign.txt +++ b/docs/igd-assign.txt @@ -48,6 +48,7 @@ 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) +* IGD claims VGA cycles on host (IGD is VGA controller on host) * Machine type is i440fx * IGD is assigned to guest BDF 00:02.0 * ROM BAR or romfile is present |