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qemu: capabilities: Introduce QEMU_CAPS_BLOCKJOB_BACKING_MASK_PROTOCOL

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The capability is asserted when both block-stream and block-commit QMP
commands support the 'backing-mask-protocol' argument.

The argument causes qemu to record 'raw' as the backing file format in
case when a protocol node is used directly. This is needed to preserve
compatibility of images after a block-commit or block-pull libvirt
operation with older libvirt versions in case when we'll want to remove
the unneded 'raw' format drivers from the block graph.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa
2023-11-24 15:19:35 +01:00
parent 8c07850c18
commit c38b4e34c8
3 changed files with 11 additions and 0 deletions
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1
tests/qemucapabilitiesdata/caps_9.0.0_x86_64.xml
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@@ -201,6 +201,7 @@
<flag name='virtio-blk.iothread-mapping'/>
<flag name='smp-clusters'/>
<flag name='virtio-mem-pci.dynamic-memslots'/>
<flag name='blockjob.backing-mask-protocol'/>
<version>8002050</version>
<microcodeVersion>43100245</microcodeVersion>
<package>v8.2.0-952-g14639717bf</package>