On Wed, Apr 22, 2020 at 01:14:44PM -0400, Jon Derrick wrote: > The two patches (Linux & QEMU) add support for passthrough VMD devices > in QEMU/KVM. VMD device 28C0 already supports passthrough natively by > providing the Host Physical Address in a shadow register to the guest > for correct bridge programming. > > The QEMU patch emulates the 28C0 mode by creating a shadow register and > advertising its support by using QEMU's subsystem vendor/id. > The Linux patch matches the QEMU subsystem vendor/id to use the shadow > register. Please pick a different PCI ID for Qemu vs real hardware so that we can properly quirk them if they end up behaving differently due to hardware or software bugs.
