RE: [RFC PATCH 0/7] vfio/pci: SR-IOV support

[Liu, Yi L]

> From: Alex Williamson <alex.williamson@xxxxxxxxxx>
> Sent: Wednesday, February 5, 2020 7:18 AM
> To: kvm@xxxxxxxxxxxxxxx
> Subject: Re: [RFC PATCH 0/7] vfio/pci: SR-IOV support
> 
> 
> Promised example QEMU test case...
> 
> commit 3557c63bcb286c71f3f7242cad632edd9e297d26
> Author: Alex Williamson <alex.williamson@xxxxxxxxxx>
> 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 <alex.williamson@xxxxxxxxxx>

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.

Regards,
Yi Liu