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. Jon Derrick (1): pci: vmd: Use Shadow MEMBAR registers for QEMU/KVM guests drivers/pci/controller/vmd.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) -- 2.18.1
