[libvirt] [PATCH v1 7/7] qemu: Enable memory-backend-file.discard-data whenever possible

https://bugzilla.redhat.com/show_bug.cgi?id=1480668 Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- src/qemu/qemu_command.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index f864350bd5..67350719aa 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -3148,6 +3148,12 @@ qemuBuildMemoryBackendStr(virJSONValuePtr *backendProps, NULL) < 0) goto cleanup; + if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_OBJECT_MEMORY_FILE_DISCARD) && + virJSONValueObjectAdd(props, + "B:discard-data", true, + NULL) < 0) + goto cleanup; + switch (memAccess) { case VIR_DOMAIN_MEMORY_ACCESS_SHARED: if (virJSONValueObjectAdd(props, "b:share", true, NULL) < 0) -- 2.16.1