This set contains 2 patches for Linux and 1 for QEMU. VMD device 8086:28C0 contains information in registers to assist with direct assignment passthrough. Several other VMD devices don't have this information, but hypervisors can easily provide the guest with this information through various means. The QEMU patch provides the information in an emulated vendor-specific PCI capability. Existing VMD devices don't conflict with the offset chosen for the capability. The Linux patch allows guest kernels to use the passthrough information emulated by the QEMU patch, by matching against the vendor-specific PCI capability if it exists. V2 Ref: https://lore.kernel.org/linux-pci/20200511190129.9313-1-jonathan.derrick@xxxxxxxxx/ Changes from v2: Uses vendor-specific PCI capability rather than emulating the 28C0 MEMBAR/VMLOCK modes. Changes from v1: v1 changed the VMD Subsystem ID to QEMU's so that the guest driver could match against it. This was unnecessary as the VMLOCK register and shadow membar registers could be safely emulated. Future VMDs will be aligned on these register bits. Jon Derrick (2): PCI: vmd: Filter resource type bits from shadow register PCI: vmd: Use Shadow MEMBAR registers for QEMU/KVM guests drivers/pci/controller/vmd.c | 50 +++++++++++++++++++++++++++++++++++++------- 1 file changed, 42 insertions(+), 8 deletions(-) -- 1.8.3.1
