Re: [PATCH v6] vfio: selftests: Find devices that have VFIO selftest drivers

[Sean Christopherson]

On Tue, Jun 02, 2026, Josh Hilke wrote:
> Add a new script, list_supported_devices.sh, which prints out the
> segment:bus:device.function (SBDF) numbers and names of devices on a
> machine that have a VFIO selftest driver. This makes it easier to
> determine if the system is capable of running VFIO selftests.
> 
> Includes a -q (quiet) argument which prints just the SBDFs so that the
> output can be passed to tools/testing/selftests/vfio/scripts/setup.sh
> (e.g. via xargs) to bind the devices to VFIO to use in VFIO selftests.
> 
> Examples:
> 
> $ ./list_supported_devices.sh
> 0000:6a:01.0 - Intel DSA SPR [8086:0b25]
> 0000:6f:01.0 - Intel DSA SPR [8086:0b25]
> 0000:74:01.0 - Intel DSA SPR [8086:0b25]
> 
> $ ./list_supported_devices.sh -q
> 0000:6a:01.0
> 0000:6f:01.0
> 0000:74:01.0
> 
> Suggested-by: Sean Christopherson <seanjc@xxxxxxxxxx>
> Signed-off-by: Josh Hilke <jrhilke@xxxxxxxxxx>

NAK, until this stuff is fixed and properly documented.

This script needs to (a) communicate that some of the devices may be on VFIO's
denylist, (b) NOT report them by default, (c) let the user report denylisted
devices, (d) make it *very* clear in the output that a device, and (e) ideally
provide the user with a hint of how that might be able to test a denied device,
e.g. by reloading vfio-pci with disable_denylist=1.

Nothing in here so much as mentions that these "supported" devices may be
disallowed by the kernel, including the devices that's USED AS THE EXAMPLE.

The DSA SPR devices has been on the naughty list since commit 95feb3160eef ("VFIO:
Add the SPR_DSA and SPR_IAX devices to the denylist") from 2024, so I have a
very hard time believing y'all weren't aware of this.  And if you really truly
weren't aware of this quirk, than what exactly are you even testing!?!?

C'mon.