[PATCH] qemu: Don't use memory-backend-memfd for NVDIMMs
If guest is configured to use memfd then the function that build
memory-backend-* part of command line will put
memory-backend-memfd, always. Even for NVDIMMs. This is not
correct, because NVDIMMs need a backing path (usually to a real
host NVDIMM device). Therefore, regardless of memfd being
requested, we have to stick with memory-backend-file.
Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com>
---
src/qemu/qemu_command.c | 3 ++-
.../memfd-memory-numa.x86_64-latest.args | 6 ++++--
tests/qemuxml2argvdata/memfd-memory-numa.xml | 11 +++++++++++
tests/qemuxml2xmltest.c | 3 ++-
4 files changed, 19 insertions(+), 4 deletions(-)
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index ea513693f7..0473e7deaa 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -3052,7 +3052,8 @@ qemuBuildMemoryBackendProps(virJSONValue **backendProps,
props = virJSONValueNewObject();
- if (def->mem.source == VIR_DOMAIN_MEMORY_SOURCE_MEMFD) {
+ if (!mem->nvdimmPath &&
+ def->mem.source == VIR_DOMAIN_MEMORY_SOURCE_MEMFD) {
backendType = "memory-backend-memfd";
if (useHugepage) {
diff --git a/tests/qemuxml2argvdata/memfd-memory-numa.x86_64-latest.args
b/tests/qemuxml2argvdata/memfd-memory-numa.x86_64-latest.args
index 5e54908666..3b33db3c55 100644
--- a/tests/qemuxml2argvdata/memfd-memory-numa.x86_64-latest.args
+++ b/tests/qemuxml2argvdata/memfd-memory-numa.x86_64-latest.args
@@ -10,13 +10,15 @@ XDG_CONFIG_HOME=/tmp/lib/domain--1-instance-00000092/.config \
-name guest=instance-00000092,debug-threads=on \
-S \
-object
'{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/tmp/lib/domain--1-instance-00000092/master-key.aes"}'
\
--machine pc-i440fx-2.3,accel=kvm,usb=off,dump-guest-core=off \
+-machine pc-i440fx-2.3,accel=kvm,usb=off,dump-guest-core=off,nvdimm=on \
-cpu qemu64 \
--m 14336 \
+-m size=14680064k,slots=16,maxmem=1099511627776k \
-overcommit mem-lock=off \
-smp 8,sockets=1,dies=1,cores=8,threads=1 \
-object
'{"qom-type":"memory-backend-memfd","id":"ram-node0","hugetlb":true,"hugetlbsize":2097152,"share":true,"prealloc":true,"size":15032385536,"host-nodes":[3],"policy":"preferred"}'
\
-numa node,nodeid=0,cpus=0-7,memdev=ram-node0 \
+-object
'{"qom-type":"memory-backend-file","id":"memnvdimm0","mem-path":"/tmp/nvdimm","share":true,"prealloc":true,"size":536870912,"host-nodes":[3],"policy":"preferred"}'
\
+-device nvdimm,node=0,memdev=memnvdimm0,id=nvdimm0,slot=0 \
-uuid 126f2720-6f8e-45ab-a886-ec9277079a67 \
-display none \
-no-user-config \
diff --git a/tests/qemuxml2argvdata/memfd-memory-numa.xml
b/tests/qemuxml2argvdata/memfd-memory-numa.xml
index 3f448790a6..d9e1a9f564 100644
--- a/tests/qemuxml2argvdata/memfd-memory-numa.xml
+++ b/tests/qemuxml2argvdata/memfd-memory-numa.xml
@@ -1,6 +1,7 @@
<domain type='kvm'>
<name>instance-00000092</name>
<uuid>126f2720-6f8e-45ab-a886-ec9277079a67</uuid>
+ <maxMemory slots='16' unit='KiB'>1099511627776</maxMemory>
<memory unit='KiB'>14680064</memory>
<currentMemory unit='KiB'>14680064</currentMemory>
<memoryBacking>
@@ -41,5 +42,15 @@
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x03' function='0x0'/>
</memballoon>
+ <memory model='nvdimm'>
+ <source>
+ <path>/tmp/nvdimm</path>
+ </source>
+ <target>
+ <size unit='KiB'>523264</size>
+ <node>0</node>
+ </target>
+ <address type='dimm' slot='0'/>
+ </memory>
</devices>
</domain>
diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
index 40e027aaa4..c5005d41a0 100644
--- a/tests/qemuxml2xmltest.c
+++ b/tests/qemuxml2xmltest.c
@@ -1305,7 +1305,8 @@ mymain(void)
DO_TEST("memfd-memory-numa",
QEMU_CAPS_OBJECT_MEMORY_MEMFD,
QEMU_CAPS_OBJECT_MEMORY_MEMFD_HUGETLB,
- QEMU_CAPS_OBJECT_MEMORY_FILE);
+ QEMU_CAPS_OBJECT_MEMORY_FILE,
+ QEMU_CAPS_DEVICE_NVDIMM);
DO_TEST("memfd-memory-default-hugepage",
QEMU_CAPS_OBJECT_MEMORY_MEMFD,
QEMU_CAPS_OBJECT_MEMORY_MEMFD_HUGETLB,
--
2.31.1