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qemu: caps: Add capability for dynamic 'auto-read-only' support for files

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Initial implementation of 'auto-read-only' didn't reopen the backing
files when needed. For '-blockdev' to work we need to be able to tel
qemu to open a file read-only and change it during blockjobs as we label
backing chains with a sVirt label which does not allow writing. The
dynamic auto-read-only supports this as it reopens files when writing
is demanded.

Add a capability to detect that the posix file based backends support
the dynamic part.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Peter Krempa 2019-04-08 17:10:37 +02:00
parent 73445e49e0
commit 3460fef5a0
7 changed files with 8 additions and 0 deletions
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2
src/qemu/qemu_capabilities.c
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@ -550,6 +550,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
/* 345 */
"arm-max-cpu",
"blockdev-file-dynamic-auto-read-only",
);
@ -1395,6 +1396,7 @@ static struct virQEMUCapsStringFlags virQEMUCapsQMPSchemaQueries[] = {
{ "query-display-options/ret-type/+egl-headless/rendernode", QEMU_CAPS_EGL_HEADLESS_RENDERNODE },
{ "nbd-server-add/arg-type/bitmap", QEMU_CAPS_NBD_BITMAP },
{ "blockdev-add/arg-type/+file/drop-cache", QEMU_CAPS_MIGRATION_FILE_DROP_CACHE },
{ "blockdev-add/arg-type/+file/$dynamic-auto-read-only", QEMU_CAPS_BLOCK_FILE_AUTO_READONLY_DYNAMIC },
};
typedef struct _virQEMUCapsObjectTypeProps virQEMUCapsObjectTypeProps;

1
src/qemu/qemu_capabilities.h
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@ -531,6 +531,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
/* 345 */
QEMU_CAPS_ARM_MAX_CPU, /* max-arm-cpu type exists */
QEMU_CAPS_BLOCK_FILE_AUTO_READONLY_DYNAMIC, /* the auto-read-only property of block backends for files is dynamic */
QEMU_CAPS_LAST /* this must always be the last item */
} virQEMUCapsFlags;

1
tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml
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@ -212,6 +212,7 @@
<flag name='vhost-user-gpu'/>
<flag name='vhost-user-vga'/>
<flag name='ramfb'/>
<flag name='blockdev-file-dynamic-auto-read-only'/>
<version>4001000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100241</microcodeVersion>

1
tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml
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@ -170,6 +170,7 @@
<flag name='vhost-user-gpu'/>
<flag name='ramfb'/>
<flag name='arm-max-cpu'/>
<flag name='blockdev-file-dynamic-auto-read-only'/>
<version>4001050</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>61700242</microcodeVersion>

1
tests/qemucapabilitiesdata/caps_4.2.0.ppc64.xml
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@ -173,6 +173,7 @@
<flag name='vhost-user-gpu'/>
<flag name='vhost-user-vga'/>
<flag name='machine.pseries.cap-ccf-assist'/>
<flag name='blockdev-file-dynamic-auto-read-only'/>
<version>4001050</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>42900242</microcodeVersion>

1
tests/qemucapabilitiesdata/caps_4.2.0.s390x.xml
View File

@ -132,6 +132,7 @@
<flag name='vhost-user-gpu'/>
<flag name='query-cpu-model-baseline'/>
<flag name='query-cpu-model-comparison'/>
<flag name='blockdev-file-dynamic-auto-read-only'/>
<version>4001050</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>39100242</microcodeVersion>

1
tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
View File

@ -213,6 +213,7 @@
<flag name='vhost-user-gpu'/>
<flag name='vhost-user-vga'/>
<flag name='ramfb'/>
<flag name='blockdev-file-dynamic-auto-read-only'/>
<version>4001092</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100242</microcodeVersion>