Re: [PATCH 2/2] vfio: selftests: Automate setting up devices for testing

[David Matlack <dmatlack@google.com>]

On 2026-04-09 01:51 AM, Josh Hilke wrote:
> Update the VFIO selftest setup script to find a device that has a VFIO selftest
> driver on the system, and set it up (i.e unbind that device from its driver, and
> then bind that device to VFIO).
> 
> This makes the process of setting up a device to VFIO selftests much easier, as
> users don't have to manually figure out which device to use.  Though, users can
> still manually setup a device by passing the -d argument with a
> segment:bus:device.function number.
> 
> Example of automated device setup:
> 
> 	$  ./tools/testing/selftests/vfio/scripts/setup.sh./setup.sh

Script path here got garbled

> 	+ echo "0000:6a:01.0" > /sys/bus/pci/drivers/idxd/unbind
> 	+ echo "vfio-pci" > /sys/bus/pci/devices/0000:6a:01.0/driver_override
> 	+ echo "0000:6a:01.0" > /sys/bus/pci/drivers/vfio-pci/bind
> 	Successfully set up 0000:6a:01.0
> 
> Example of automated device setup where no compatible devices exist:
> 
> 	$ . ./tools/testing/selftests/vfio/scripts/setup.sh/setup.sh

Here too, also the extra '.' before the path looks like a mistake.

> 	No available supported devices found on the system.
> 
> Example of manual device setup:
> 
> 	$  ./tools/testing/selftests/vfio/scripts/setup.sh -d 0000:6a:01.0
> 	+ echo "0000:6a:01.0" > /sys/bus/pci/drivers/idxd/unbind
> 	+ echo "vfio-pci" > /sys/bus/pci/devices/0000:6a:01.0/driver_override
> 	+ echo "0000:6a:01.0" > /sys/bus/pci/drivers/vfio-pci/bind
> 	Successfully set up 0000:6a:01.0
> 
> Signed-off-by: Josh Hilke <jrhilke@google.com>

Please add Suggested-by tag for Sean and also Cc Sean on next version
of the series :)

> ---
>  tools/testing/selftests/vfio/scripts/setup.sh | 22 +++++++++++++++++--
>  1 file changed, 20 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/testing/selftests/vfio/scripts/setup.sh b/tools/testing/selftests/vfio/scripts/setup.sh
> index 2cde07eb9c8b..6d4492b211ea 100755
> --- a/tools/testing/selftests/vfio/scripts/setup.sh
> +++ b/tools/testing/selftests/vfio/scripts/setup.sh
> @@ -19,11 +19,30 @@ function print_supported_devices() {
>  	done
>  }
>  
> +function pick_device() {
> +	local bdf
> +
> +	while read -r bdf; do
> +		if [ -n "${bdf}" ]; then
> +			if [ -d "${DEVICES_DIR}/${bdf}" ]; then
> +				echo "${bdf} has already been set up, exiting." >&2
> +				exit 0
> +			fi
> +			echo "${bdf}"
> +			return 0
> +		fi
> +	done <<< "$(print_supported_devices)"
> +
> +	echo "No available supported devices found on the system." >&2

I think we should make it clear what "supported" means in this log. This
is about finding a device that has a VFIO selftests driver, which is
only required by some tests.

Same goes for the -l option in the previous commit actually and the
usage message below.

> +	exit 1
> +}
> +
>  function usage() {
>  	echo "usage: $0 [-l] [-d <segment:bus:device.function>]" >&2
>  	echo "" >&2
>  	echo "  -l  List segment:bus:device.function numbers of supported devices." >&2
>  	echo "  -d  segment:bus:device.function to set up." >&2
> +	echo "      If -d is not specified, a device will be automatically picked." >&2
>  }
>  
>  function main() {
> @@ -46,8 +65,7 @@ function main() {
>  	done
>  
>  	if [ ${#bdf_list[@]} -eq 0 ]; then
> -		usage
> -		exit 1
> +		bdf_list=($(pick_device))

Sashiko thinks this will ignore any errors from pick_device():

  https://sashiko.dev/#/patchset/20260409015139.2800185-1-jrhilke%40google.com?part=2

>  	fi
>  
>  	for device_bdf in "${bdf_list[@]}"; do
> -- 
> 2.53.0.1213.gd9a14994de-goog
>