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@xxxxxxxxxx>
Reviewed-by: Jiri Denemark <jdenemar@xxxxxxxxxx>
---
src/qemu/qemu_capabilities.c | 2 ++
src/qemu/qemu_capabilities.h | 1 +
tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml | 1 +
tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml | 1 +
tests/qemucapabilitiesdata/caps_4.2.0.ppc64.xml | 1 +
tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml | 1 +
6 files changed, 7 insertions(+)
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index a057318432..2c1f7c834b 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -550,6 +550,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
/* 345 */
"arm-max-cpu",
+ "blockdev-file-dynamic-auto-read-only",
);
@@ -1292,6 +1293,7 @@ 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;
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index aa593396ce..2667b77ff8 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -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;
diff --git a/tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml
index 36b07579b2..def36e2f73 100644
--- a/tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml
@@ -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>
diff --git a/tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml b/tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml
index 17960460fb..bb34b35209 100644
--- a/tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml
@@ -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>
diff --git a/tests/qemucapabilitiesdata/caps_4.2.0.ppc64.xml b/tests/qemucapabilitiesdata/caps_4.2.0.ppc64.xml
index 561d955247..f8d1c62c11 100644
--- a/tests/qemucapabilitiesdata/caps_4.2.0.ppc64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.2.0.ppc64.xml
@@ -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>
diff --git a/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
index 534a8f744c..26fd37141c 100644
--- a/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
@@ -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>4001090</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100242</microcodeVersion>
--
2.23.0
--
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