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 | 5 +++++
src/qemu/qemu_capabilities.h | 1 +
tests/qemucapabilitiesdata/caps_8.2.0_x86_64.xml | 1 +
3 files changed, 7 insertions(+)
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 83119e871a..ac07d3eb22 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -698,6 +698,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
/* 450 */
"run-with.async-teardown", /* QEMU_CAPS_RUN_WITH_ASYNC_TEARDOWN */
"virtio-blk-vhost-vdpa", /* QEMU_CAPS_DEVICE_VIRTIO_BLK_VHOST_VDPA */
+ "blockjob.backing-mask-protocol", /* QEMU_CAPS_BLOCKJOB_BACKING_MASK_PROTOCOL */
);
@@ -5467,6 +5468,10 @@ 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 3c4f7f625b..60b37c772c 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -677,6 +677,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
/* 450 */
QEMU_CAPS_RUN_WITH_ASYNC_TEARDOWN, /* asynchronous teardown -run-with async-teardown=on|off */
QEMU_CAPS_DEVICE_VIRTIO_BLK_VHOST_VDPA, /* virtio-blk-vhost-vdpa block driver */
+ 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_8.2.0_x86_64.xml b/tests/qemucapabilitiesdata/caps_8.2.0_x86_64.xml
index 6318b407c9..fb8e643040 100644
--- a/tests/qemucapabilitiesdata/caps_8.2.0_x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_8.2.0_x86_64.xml
@@ -199,6 +199,7 @@
<flag name='qcow2-discard-no-unref'/>
<flag name='run-with.async-teardown'/>
<flag name='virtio-blk-vhost-vdpa'/>
+ <flag name='blockjob.backing-mask-protocol'/>
<version>8001092</version>
<microcodeVersion>43100246</microcodeVersion>
<package>v8.2.0-rc2-49-g65ad44546c</package>
--
2.43.0
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