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qemu: Assume QEMU_CAPS_OBJECT_MEMORY_FILE_DISCARD

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Introduced in QEMU's commit of v2.11.0-rc0~95^2~9 the .discard
attribute of memory-backend-file is always available for all QEMU
versions we support (4.2.0, currently). Therefore, we can assume
the capability is always set and thus doesn't need to be checked
for.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Michal Privoznik 2022-11-03 16:19:27 +01:00
parent 9d86ae4ca2
commit 8c0d43803b
3 changed files with 6 additions and 13 deletions
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13
src/qemu/qemu_command.c
View File

@ -3351,16 +3351,9 @@ qemuBuildMemoryBackendProps(virJSONValue **backendProps,
return -1;
if (!mem->nvdimmPath &&
discard == VIR_TRISTATE_BOOL_YES) {
if (!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_OBJECT_MEMORY_FILE_DISCARD)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("this QEMU doesn't support memory discard"));
return -1;
}
if (virJSONValueObjectAdd(&props,
"B:discard-data", true,
NULL) < 0)
virJSONValueObjectAdd(&props,
"T:discard-data", discard,
NULL) < 0) {
return -1;
}

2
tests/qemuxml2argvdata/pages-dimm-discard.x86_64-latest.args
View File

@ -29,7 +29,7 @@ XDG_CONFIG_HOME=/tmp/lib/domain--1-fedora/.config \
-no-acpi \
-boot strict=on \
-device '{"driver":"piix3-usb-uhci","id":"usb","bus":"pci.0","addr":"0x1.0x2"}' \
-object '{"qom-type":"memory-backend-file","id":"memdimm0","mem-path":"/dev/hugepages1G/libvirt/qemu/-1-fedora","prealloc":true,"size":1073741824,"host-nodes":[1,2,3],"policy":"bind"}' \
-object '{"qom-type":"memory-backend-file","id":"memdimm0","mem-path":"/dev/hugepages1G/libvirt/qemu/-1-fedora","discard-data":false,"prealloc":true,"size":1073741824,"host-nodes":[1,2,3],"policy":"bind"}' \
-device '{"driver":"pc-dimm","node":0,"memdev":"memdimm0","id":"dimm0","slot":0}' \
-object '{"qom-type":"memory-backend-file","id":"memdimm1","mem-path":"/var/lib/libvirt/qemu/ram/-1-fedora/dimm1","discard-data":true,"share":false,"size":536870912}' \
-device '{"driver":"pc-dimm","node":0,"memdev":"memdimm1","id":"dimm1","slot":1}' \

2
tests/qemuxml2argvdata/pages-discard-hugepages.x86_64-latest.args
View File

@ -16,7 +16,7 @@ XDG_CONFIG_HOME=/tmp/lib/domain--1-SomeDummyHugepagesGu/.config \
-m 1024 \
-overcommit mem-lock=off \
-smp 2,sockets=2,cores=1,threads=1 \
-object '{"qom-type":"memory-backend-file","id":"ram-node0","mem-path":"/dev/hugepages2M/libvirt/qemu/-1-SomeDummyHugepagesGu","prealloc":true,"size":268435456}' \
-object '{"qom-type":"memory-backend-file","id":"ram-node0","mem-path":"/dev/hugepages2M/libvirt/qemu/-1-SomeDummyHugepagesGu","discard-data":false,"prealloc":true,"size":268435456}' \
-numa node,nodeid=0,cpus=0,memdev=ram-node0 \
-object '{"qom-type":"memory-backend-file","id":"ram-node1","mem-path":"/dev/hugepages2M/libvirt/qemu/-1-SomeDummyHugepagesGu","discard-data":true,"prealloc":true,"size":805306368}' \
-numa node,nodeid=1,cpus=1,memdev=ram-node1 \