I forgot adding v2 in subject, sorry for my mistake. Moeko
On 4/29/25 00:09, Tomita Moeko wrote: > As proposed in a previous discussion [1], detect IGD devices based on > whether it has VFIO_REGION_SUBTYPE_INTEL_IGD_OPREGION exposed by kernel > and enables OpRegion access by default. This enables out-of-the-box > display output support for IGD passthrough without having to manually > set x-igd-opregion=on, which probably saves effort for libvirt users. > > This patchset also limits legacy mode to Gen6-9 devices, as Intel no > longer provides CSM support and VBIOS on newer IGD, and Seabios does not > support setting up the 64 bit BDSM register on Gen 11+ devices. Exposing > VGA ranges to guests by default on platforms without VGA mode support is > undesirable. > > Additionally, as we enables OpRegion on IGD devices by default, and > Intel removes the BDSM register from Meteor Lake [2]. There seems to be > no extra register quirks rather than OpRegion required on newer devices. > To support them (and probably future devices), the generation limit is > removed, with BDSM quirk only applied to known Gen 6-12 devices. > > Note: I have not been able to test this on Meteor Lake or newer > platforms due to lack of hardware. > > > [1] > https://lore.kernel.org/qemu-devel/20250325172239.27926-1-tomitamo...@gmail.com > [2] > https://edc.intel.com/content/www/us/en/design/publications/14th-generation-core-processors-cfg-and-mem-registers/d2-f0-processor-graphics-registers/ > > Changelog: > v2: > * Removed "Allow hotplugging with OpRegion enabled", hotplugging is > always forbidden. > * Test device is not hotplugged and get opregion in a single function. > * Update documentation along with code changes. > * Minor code style fixes. > Link: > https://lore.kernel.org/qemu-devel/20250421163112.21316-1-tomitamo...@gmail.coms > > Tomita Moeko (9): > vfio/igd: Restrict legacy mode to Gen6-9 devices > vfio/igd: Always emulate ASLS (OpRegion) register > vfio/igd: Detect IGD device by OpRegion > vfio/igd: Check vendor and device ID on GVT-g mdev > vfio/igd: Check OpRegion support on GVT-g mdev > vfio/igd: Enable OpRegion by default > vfio/igd: Allow overriding GMS with 0xf0 to 0xfe on Gen9+ > vfio/igd: Only emulate GGC register when x-igd-gms is set > vfio/igd: Remove generation limitation for IGD passthrough > > docs/igd-assign.txt | 11 ++- > hw/vfio/igd.c | 218 ++++++++++++++++++++++++++------------------ > hw/vfio/pci.c | 2 +- > 3 files changed, 137 insertions(+), 94 deletions(-) >
