Shared Virtual Addressing (SVA), a.k.a, Shared Virtual Memory (SVM) on Intel platforms allows address space sharing between device DMA and applications. SVA can reduce programming complexity and enhance security. To enable SVA, device needs to have PASID capability, which is a key capability for SVA. This patchset exposes the device's PASID capability to guest instead of hiding it from guest. The second patch emulates PASID capability for VFs (Virtual Function) since VFs don't implement such capability per PCIe spec. This patch emulates such capability and expose to VM if the capability is enabled in PF (Physical Function). However, there is an open for PASID emulation. If PF driver disables PASID capability at runtime, then it may be an issue. e.g. PF should not disable PASID capability if there is guest using this capability on any VF related to this PF. To solve it, may need to introduce a generic communication framework between vfio-pci driver and PF drivers. Please feel free to give your suggestions on it. Liu Yi L (2): vfio/pci: Expose PCIe PASID capability to guest vfio/pci: Emulate PASID/PRI capability for VFs drivers/vfio/pci/vfio_pci_config.c | 321 ++++++++++++++++++++++++++++++++++++- 1 file changed, 318 insertions(+), 3 deletions(-) -- 2.7.4
