Re: [PATCH v5 13/15] vfio/pci: Expose PCIe PASID capability to guest

Auger Eric
2020-07-20T12:35:49Z

Yi,

On 7/12/20 1:21 PM, Liu Yi L wrote:
> This patch exposes PCIe PASID capability to guest for assigned devices.
> Existing vfio_pci driver hides it from guest by setting the capability
> length as 0 in pci_ext_cap_length[].
>
> And this patch only exposes PASID capability for devices which has PCIe
> PASID extended struture in its configuration space. So VFs, will will
s/will//
> not see PASID capability on VFs as VF doesn't implement PASID extended
suggested rewording: VFs will not expose the PASID capability as they do
not implement the PASID extended structure in their config space?
> structure in its configuration space. For VF, it is a TODO in future.
> Related discussion can be found in below link:
>
> https://lkml.org/lkml/2020/4/7/693

>
> 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>
> ---
> 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 d98843f..07ff2e6 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,
> };
>
> /*
>
Reviewed-by: Eric Auger <eric.auger@redhat.com>

Thanks

Eric