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docs: drvqemu: Give example how to query device properties for overriding

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Add an example of invoking qemu with '-device TYPE,?' to query
properties of a given type.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2022-11-21 13:46:29 +01:00
parent 9228ebbf98
commit f28232d1a4
1 changed files with 5 additions and 0 deletions
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docs/drvqemu.rst
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@ -722,6 +722,11 @@ attribute are:
The overrides are applied only to initial device configuration passed to QEMU The overrides are applied only to initial device configuration passed to QEMU
via the commandline. Later hotplug operations will not apply any modifications. via the commandline. Later hotplug operations will not apply any modifications.
The properties of a device can be queried directly in qemu (e.g. for the
``virtio-blk-pci`` device) via ::
# qemu-system-x86_64 -device virtio-blk-pci,?
Configuring override for a device alias which is not used or attempting to Configuring override for a device alias which is not used or attempting to
remove a device property which is not formatted by libvirt will cause failure remove a device property which is not formatted by libvirt will cause failure
to startup the VM. to startup the VM.