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SubjectRE: [RFC PATCH 0/7] vfio/pci: SR-IOV support
> From: Alex Williamson <>
> Sent: Wednesday, February 5, 2020 7:18 AM
> To:
> Subject: Re: [RFC PATCH 0/7] vfio/pci: SR-IOV support
> Promised example QEMU test case...
> commit 3557c63bcb286c71f3f7242cad632edd9e297d26
> Author: Alex Williamson <>
> Date: Tue Feb 4 13:47:41 2020 -0700
> vfio-pci: QEMU support for vfio-pci VF tokens
> Example support for using a vf_token to gain access to a device as
> well as using the VFIO_DEVICE_FEATURE interface to set the VF token.
> Note that the kernel will disregard the additional option where it's
> not required, such as opening the PF with no VF users, so we can
> always provide it.
> NB. It's unclear whether there's value to this QEMU support without
> further exposure of SR-IOV within a VM. This is meant mostly as a
> test case where the real initial users will likely be DPDK drivers.
> Signed-off-by: Alex Williamson <>

Just curious how UUID is used across the test. Should the QEMU
which opens VFs add the vfio_token=UUID or the QEMU which
opens PF add the vfio_token=UUID? or both should add vfio_token=UUID.

Yi Liu

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