Hi Alex, Any comment on this series? Regards, Yi Liu > From: Liu, Yi L > Sent: Wednesday, January 29, 2020 8:19 PM > To: alex.williamson@xxxxxxxxxx; eric.auger@xxxxxxxxxx > Subject: [RFC v1 0/2] vfio/pci: expose device's PASID capability to VMs > > 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
