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qemu: capabilities: Introduce QEMU_CAPS_QCOW2_DISCARD_NO_UNREF

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The qcow2 driver allows passing discards to the storage while keeping
the reference of the block, and just marking it as zeroed. This can
decrease the levels of fragmentation of the qcow2 metadata when
discards are enabled.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2023-06-23 14:12:52 +02:00
parent 91856be29b
commit 1092a88e13
3 changed files with 4 additions and 0 deletions
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2
src/qemu/qemu_capabilities.c
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@ -693,6 +693,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
"virtio-gpu.blob", /* QEMU_CAPS_VIRTIO_GPU_BLOB */ "virtio-gpu.blob", /* QEMU_CAPS_VIRTIO_GPU_BLOB */
"rbd-encryption-layering", /* QEMU_CAPS_RBD_ENCRYPTION_LAYERING */ "rbd-encryption-layering", /* QEMU_CAPS_RBD_ENCRYPTION_LAYERING */
"rbd-encryption-luks-any", /* QEMU_CAPS_RBD_ENCRYPTION_LUKS_ANY */ "rbd-encryption-luks-any", /* QEMU_CAPS_RBD_ENCRYPTION_LUKS_ANY */
"qcow2-discard-no-unref", /* QEMU_CAPS_QCOW2_DISCARD_NO_UNREF */
); );
@ -1536,6 +1537,7 @@ static struct virQEMUCapsStringFlags virQEMUCapsQMPSchemaQueries[] = {
{ "blockdev-add/arg-type/+rbd/encrypt/parent", QEMU_CAPS_RBD_ENCRYPTION_LAYERING }, { "blockdev-add/arg-type/+rbd/encrypt/parent", QEMU_CAPS_RBD_ENCRYPTION_LAYERING },
{ "blockdev-add/arg-type/+rbd/encrypt/format/^luks-any", QEMU_CAPS_RBD_ENCRYPTION_LUKS_ANY }, { "blockdev-add/arg-type/+rbd/encrypt/format/^luks-any", QEMU_CAPS_RBD_ENCRYPTION_LUKS_ANY },
{ "blockdev-add/arg-type/+nbd/tls-hostname", QEMU_CAPS_BLOCKDEV_NBD_TLS_HOSTNAME }, { "blockdev-add/arg-type/+nbd/tls-hostname", QEMU_CAPS_BLOCKDEV_NBD_TLS_HOSTNAME },
{ "blockdev-add/arg-type/+qcow2/discard-no-unref", QEMU_CAPS_QCOW2_DISCARD_NO_UNREF },
{ "blockdev-snapshot/$allow-write-only-overlay", QEMU_CAPS_BLOCKDEV_SNAPSHOT_ALLOW_WRITE_ONLY }, { "blockdev-snapshot/$allow-write-only-overlay", QEMU_CAPS_BLOCKDEV_SNAPSHOT_ALLOW_WRITE_ONLY },
{ "chardev-add/arg-type/backend/+socket/data/reconnect", QEMU_CAPS_CHARDEV_RECONNECT }, { "chardev-add/arg-type/backend/+socket/data/reconnect", QEMU_CAPS_CHARDEV_RECONNECT },
{ "device_add/$json-cli-hotplug", QEMU_CAPS_DEVICE_JSON }, { "device_add/$json-cli-hotplug", QEMU_CAPS_DEVICE_JSON },

1
src/qemu/qemu_capabilities.h
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@ -672,6 +672,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
QEMU_CAPS_VIRTIO_GPU_BLOB, /* -device virtio-gpu-*.blob= */ QEMU_CAPS_VIRTIO_GPU_BLOB, /* -device virtio-gpu-*.blob= */
QEMU_CAPS_RBD_ENCRYPTION_LAYERING, /* layered encryption support for Ceph RBD */ QEMU_CAPS_RBD_ENCRYPTION_LAYERING, /* layered encryption support for Ceph RBD */
QEMU_CAPS_RBD_ENCRYPTION_LUKS_ANY, /* luks-any (LUKS and LUKS2) encryption format for Ceph RBD */ QEMU_CAPS_RBD_ENCRYPTION_LUKS_ANY, /* luks-any (LUKS and LUKS2) encryption format for Ceph RBD */
QEMU_CAPS_QCOW2_DISCARD_NO_UNREF, /* qcow2 block driver allows discards without unrefing the sector */
QEMU_CAPS_LAST /* this must always be the last item */ QEMU_CAPS_LAST /* this must always be the last item */
} virQEMUCapsFlags; } virQEMUCapsFlags;

1
tests/qemucapabilitiesdata/caps_8.1.0_x86_64.xml
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@ -206,6 +206,7 @@
<flag name='virtio-gpu.blob'/> <flag name='virtio-gpu.blob'/>
<flag name='rbd-encryption-layering'/> <flag name='rbd-encryption-layering'/>
<flag name='rbd-encryption-luks-any'/> <flag name='rbd-encryption-luks-any'/>
<flag name='qcow2-discard-no-unref'/>
<version>8000050</version> <version>8000050</version>
<microcodeVersion>43100245</microcodeVersion> <microcodeVersion>43100245</microcodeVersion>
<package>v8.0.0-1619-g369081c455</package> <package>v8.0.0-1619-g369081c455</package>