From: Liu Yi L yi.l.liu@intel.com
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@w520.home/
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
Cc: Kevin Tian kevin.tian@intel.com CC: Jacob Pan jacob.jun.pan@linux.intel.com Cc: Alex Williamson alex.williamson@redhat.com Cc: Eric Auger eric.auger@redhat.com Cc: Jean-Philippe Brucker jean-philippe@linaro.org Cc: Joerg Roedel joro@8bytes.org Cc: Lu Baolu baolu.lu@linux.intel.com Signed-off-by: Liu Yi L yi.l.liu@intel.com Reviewed-by: Eric Auger eric.auger@redhat.com Signed-off-by: Kunkun Jiang jiangkunkun@huawei.com --- 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 d80a4d4aea43..333d74b8938a 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, /* not yet */ [PCI_EXT_CAP_ID_DVSEC] = 0xFF, };