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SubjectRe: [PATCH v3 5/7] vfio/pci: Add sriov_configure support
On Wed, 11 Mar 2020 15:59:12 -0600
Alex Williamson <> wrote:

> With the VF Token interface we can now expect that a vfio userspace
> driver must be in collaboration with the PF driver, an unwitting
> userspace driver will not be able to get past the GET_DEVICE_FD step
> in accessing the device. We can now move on to actually allowing
> SR-IOV to be enabled by vfio-pci on the PF. Support for this is not
> enabled by default in this commit, but it does provide a module option
> for this to be enabled (enable_sriov=1). Enabling VFs is rather
> straightforward, except we don't want to risk that a VF might get
> autoprobed and bound to other drivers, so a bus notifier is used to
> "capture" VFs to vfio-pci using the driver_override support. We
> assume any later action to bind the device to other drivers is
> condoned by the system admin and allow it with a log warning.
> vfio-pci will disable SR-IOV on a PF before releasing the device,
> allowing a VF driver to be assured other drivers cannot take over the
> PF and that any other userspace driver must know the shared VF token.
> This support also does not provide a mechanism for the PF userspace
> driver itself to manipulate SR-IOV through the vfio API. With this
> patch SR-IOV can only be enabled via the host sysfs interface and the
> PF driver user cannot create or remove VFs.
> Signed-off-by: Alex Williamson <>
> ---
> drivers/vfio/pci/vfio_pci.c | 106 +++++++++++++++++++++++++++++++----
> drivers/vfio/pci/vfio_pci_private.h | 2 +
> 2 files changed, 97 insertions(+), 11 deletions(-)

Reviewed-by: Cornelia Huck <>

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