This patch exposes PCIe PASID capability to userspace and where to emulate this capability if wants to further expose it to VM. And this patch only exposes PASID capability for devices which has PCIe PASID extended struture in its configuration space. While for VFs, user space still unable to see this capability as SR-IOV spec forbides VF to implement PASID capability extended structure. It is a TODO in future. Related discussion can be found in below link: https://lore.kernel.org/kvm/20200407095801.648b1371@xxxxxxxxx/ Cc: Kevin Tian <kevin.tian@xxxxxxxxx> CC: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx> Cc: Alex Williamson <alex.williamson@xxxxxxxxxx> Cc: Eric Auger <eric.auger@xxxxxxxxxx> Cc: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx> Cc: Joerg Roedel <joro@xxxxxxxxxx> Cc: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx> Signed-off-by: Liu Yi L <yi.l.liu@xxxxxxxxx> Reviewed-by: Eric Auger <eric.auger@xxxxxxxxxx> --- v7 -> v8: *) refine the commit message and the subject. v5 -> v6: *) add review-by from Eric Auger. v1 -> v2: *) added in v2, but it was sent in a separate patchseries before --- drivers/vfio/pci/vfio_pci_config.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c index a402adee8a21..95b5478f51ac 100644 --- a/drivers/vfio/pci/vfio_pci_config.c +++ b/drivers/vfio/pci/vfio_pci_config.c @@ -95,7 +95,7 @@ static const u16 pci_ext_cap_length[PCI_EXT_CAP_ID_MAX + 1] = { [PCI_EXT_CAP_ID_LTR] = PCI_EXT_CAP_LTR_SIZEOF, [PCI_EXT_CAP_ID_SECPCI] = 0, /* not yet */ [PCI_EXT_CAP_ID_PMUX] = 0, /* not yet */ - [PCI_EXT_CAP_ID_PASID] = 0, /* not yet */ + [PCI_EXT_CAP_ID_PASID] = PCI_EXT_CAP_PASID_SIZEOF, }; /* -- 2.25.1
