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qemu: Check for drop-cache capability

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QEMU 4.0.0 and newer automatically drops caches at the end of migration.
Let's check for this capability so that we can allow migration when disk
cache is turned on.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Acked-By: Peter Krempa <pkrempa@redhat.com>
This commit is contained in:
Jiri Denemark 2019-08-13 15:17:36 +02:00
parent 4748f8df29
commit 598ec0db68
9 changed files with 10 additions and 0 deletions
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2
src/qemu/qemu_capabilities.c
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@ -536,6 +536,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
/* 335 */
"bochs-display",
"migration-file-drop-cache",
);
@ -1279,6 +1280,7 @@ static struct virQEMUCapsStringFlags virQEMUCapsQMPSchemaQueries[] = {
{ "query-iothreads/ret-type/poll-max-ns", QEMU_CAPS_IOTHREAD_POLLING },
{ "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 },
};
typedef struct _virQEMUCapsObjectTypeProps virQEMUCapsObjectTypeProps;

1
src/qemu/qemu_capabilities.h
View File

@ -517,6 +517,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
/* 335 */
QEMU_CAPS_DEVICE_BOCHS_DISPLAY, /* -device bochs-display */
QEMU_CAPS_MIGRATION_FILE_DROP_CACHE, /* migration with disk cache on is safe for type='file' disks */
QEMU_CAPS_LAST /* this must always be the last item */
} virQEMUCapsFlags;

1
tests/qemucapabilitiesdata/caps_4.0.0.aarch64.xml
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@ -164,6 +164,7 @@
<flag name='bitmap-merge'/>
<flag name='nbd-bitmap'/>
<flag name='bochs-display'/>
<flag name='migration-file-drop-cache'/>
<version>4000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>61700758</microcodeVersion>

1
tests/qemucapabilitiesdata/caps_4.0.0.ppc64.xml
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@ -169,6 +169,7 @@
<flag name='bitmap-merge'/>
<flag name='nbd-bitmap'/>
<flag name='bochs-display'/>
<flag name='migration-file-drop-cache'/>
<version>4000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>42900758</microcodeVersion>

1
tests/qemucapabilitiesdata/caps_4.0.0.riscv32.xml
View File

@ -167,6 +167,7 @@
<flag name='bitmap-merge'/>
<flag name='nbd-bitmap'/>
<flag name='bochs-display'/>
<flag name='migration-file-drop-cache'/>
<version>4000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>0</microcodeVersion>

1
tests/qemucapabilitiesdata/caps_4.0.0.riscv64.xml
View File

@ -167,6 +167,7 @@
<flag name='bitmap-merge'/>
<flag name='nbd-bitmap'/>
<flag name='bochs-display'/>
<flag name='migration-file-drop-cache'/>
<version>4000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>0</microcodeVersion>

1
tests/qemucapabilitiesdata/caps_4.0.0.s390x.xml
View File

@ -131,6 +131,7 @@
<flag name='query-current-machine'/>
<flag name='bitmap-merge'/>
<flag name='nbd-bitmap'/>
<flag name='migration-file-drop-cache'/>
<version>4000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>39100758</microcodeVersion>

1
tests/qemucapabilitiesdata/caps_4.0.0.x86_64.xml
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@ -206,6 +206,7 @@
<flag name='nbd-bitmap'/>
<flag name='x86-max-cpu'/>
<flag name='bochs-display'/>
<flag name='migration-file-drop-cache'/>
<version>4000000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100758</microcodeVersion>

1
tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml
View File

@ -208,6 +208,7 @@
<flag name='cpu-unavailable-features'/>
<flag name='canonical-cpu-features'/>
<flag name='bochs-display'/>
<flag name='migration-file-drop-cache'/>
<version>4000050</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100759</microcodeVersion>