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virtio: Provide a command to list virtio devices

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U-Boot only supports a subset of the devices supported by QEMU. For
example, U-Boot does not currently support the vsock device.

It is helpful to see what devices are provided by QEMU and whether there
is a driver for it in U-Boot.

Add a new 'virtio list' command to provide this.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2025-07-06 06:35:08 +02:00
parent 7013d9f2f1
commit bbd1cc14c1
4 changed files with 76 additions and 0 deletions
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43
doc/usage/cmd/virtio.rst
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@@ -13,6 +13,7 @@ Synopsis
virtio scan
virtio info
virtio list
virtio device
virtio part
virtio read <addr> <blk#> <cnt>
@@ -48,6 +49,12 @@ virtio info
This lists the available block devices (only), including the name, type and
capacity.
virtio list
~~~~~~~~~~~
This shows a list of QEMU devices along with U-Boot each attached to each. Note
that QEMU devices that U-Boot doesn't support will not be assigned a driver.
virtio device
~~~~~~~~~~~~~
@@ -148,6 +155,42 @@ warning indicates that device 1 does not have a valid filesystem.
cpu 0 [ ] cpu_qemu `-- cpu@0
=>
This shows listing QEMU devices before and after scanning. Note that devices
which show '(none)' in the Driver column are not supported by U-Boot.
::
=> virtio list
Name Type Driver
-------------------- -------------- ---------------
virtio-pci.m#0 0: (unknown) (none)
virtio-pci.m#1 0: (unknown) (none)
virtio-pci.m#2 0: (unknown) (none)
virtio-pci.m#3 0: (unknown) (none)
virtio-pci.m#4 0: (unknown) (none)
virtio-pci.m#5 0: (unknown) (none)
virtio-pci.m#6 0: (unknown) (none)
virtio-pci.m#7 0: (unknown) (none)
virtio-pci.m#8 0: (unknown) (none)
virtio-pci.m#9 0: (unknown) (none)
virtio-pci.m#10 0: (unknown) (none)
=> virtio scan
=> virtio list
Name Type Driver
-------------------- -------------- ---------------
virtio-pci.m#0 5: balloon (none)
virtio-pci.m#1 4: rng (none)
virtio-pci.m#2 12: input-host (none)
virtio-pci.m#3 12: input-host (none)
virtio-pci.m#4 13: vsock (none)
virtio-pci.m#5 3: serial (none)
virtio-pci.m#6 8: scsi virtio-scsi#6
virtio-pci.m#7 9: 9p (none)
virtio-pci.m#8 1a: fs virtio-fs#8
virtio-pci.m#9 10: gpu (none)
virtio-pci.m#10 1: net virtio-net#a
=>
This shows reading and displaying the partition table for device 0::
=> virtio part 0