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@xxxxxxxxxx>
---
src/qemu/qemu_capabilities.c | 7 +++++++
src/qemu/qemu_capabilities.h | 3 +++
tests/qemucapabilitiesdata/caps_9.0.0_x86_64.xml | 1 +
3 files changed, 11 insertions(+)
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index f4b4f05479..e383d85920 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -701,6 +701,9 @@ VIR_ENUM_IMPL(virQEMUCaps,
"virtio-blk.iothread-mapping", /* QEMU_CAPS_VIRTIO_BLK_IOTHREAD_MAPPING */
"smp-clusters", /* QEMU_CAPS_SMP_CLUSTERS */
"virtio-mem-pci.dynamic-memslots", /* QEMU_CAPS_DEVICE_VIRTIO_MEM_PCI_DYNAMIC_MEMSLOTS */
+
+ /* 455 */
+ "blockjob.backing-mask-protocol", /* QEMU_CAPS_BLOCKJOB_BACKING_MASK_PROTOCOL */
);
@@ -5425,6 +5428,10 @@ virQEMUCapsProbeQMPSchemaCapabilities(virQEMUCaps *qemuCaps,
virQEMUCapsSet(qemuCaps, cmd->flag);
}
+ if (virQEMUQAPISchemaPathExists("block-commit/arg-type/backing-mask-protocol", schema) &&
+ virQEMUQAPISchemaPathExists("block-stream/arg-type/backing-mask-protocol", schema))
+ virQEMUCapsSet(qemuCaps, QEMU_CAPS_BLOCKJOB_BACKING_MASK_PROTOCOL);
+
return 0;
}
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index 1b5130a1d3..486a4a6f63 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -681,6 +681,9 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
QEMU_CAPS_SMP_CLUSTERS, /* -smp clusters= */
QEMU_CAPS_DEVICE_VIRTIO_MEM_PCI_DYNAMIC_MEMSLOTS, /* -device virtio-mem-pci.dynamic-memslots= */
+ /* 455 */
+ QEMU_CAPS_BLOCKJOB_BACKING_MASK_PROTOCOL, /* backing-mask-protocol of block-commit/block-stream */
+
QEMU_CAPS_LAST /* this must always be the last item */
} virQEMUCapsFlags;
diff --git a/tests/qemucapabilitiesdata/caps_9.0.0_x86_64.xml b/tests/qemucapabilitiesdata/caps_9.0.0_x86_64.xml
index a1859fbf6d..7bf13da1db 100644
--- a/tests/qemucapabilitiesdata/caps_9.0.0_x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_9.0.0_x86_64.xml
@@ -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>
--
2.43.0
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