[libvirt] [PATCH v2 2/3] qemu: Create hugepage path on per domain basis
Michal Privoznik
mprivozn at redhat.com
Tue Nov 29 09:31:12 UTC 2016
If you've ever tried running a huge page backed guest under
different user than root, you probably failed. Problem is even
though we have corresponding APIs in the security drivers,
there's no implementation and thus we don't relabel the huge page
path. But even if we did, so far all of the domains share the
same path:
/hugepageMount/libvirt/qemu
Our only option there would be to set 0777 mode on the qemu dir
which is totally unsafe. Therefore, we can create dir on
per-domain basis, i.e.:
/hugepageMount/libvirt/qemu/domainName
and chown domainName dir to the user that domain is configured to
run under.
Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
src/qemu/qemu_command.c | 4 +-
src/qemu/qemu_conf.c | 44 +++++++++----
src/qemu/qemu_conf.h | 16 +++--
src/qemu/qemu_driver.c | 19 ++----
src/qemu/qemu_process.c | 74 ++++++++++++++++------
.../qemuxml2argv-hugepages-numa.args | 6 +-
.../qemuxml2argv-hugepages-pages.args | 16 ++---
.../qemuxml2argv-hugepages-pages2.args | 2 +-
.../qemuxml2argv-hugepages-pages3.args | 2 +-
.../qemuxml2argv-hugepages-pages5.args | 2 +-
.../qemuxml2argv-hugepages-shared.args | 14 ++--
tests/qemuxml2argvdata/qemuxml2argv-hugepages.args | 2 +-
.../qemuxml2argv-memory-hotplug-dimm-addr.args | 4 +-
.../qemuxml2argv-memory-hotplug-dimm.args | 4 +-
14 files changed, 131 insertions(+), 78 deletions(-)
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 6c457dd..10b6d45 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -3303,7 +3303,7 @@ qemuBuildMemoryBackendStr(unsigned long long size,
return -1;
if (pagesize) {
- if (qemuGetHupageMemPath(cfg, pagesize, &mem_path) < 0)
+ if (qemuGetDomainHupageMemPath(def, cfg, pagesize, &mem_path) < 0)
goto cleanup;
*backendType = "memory-backend-file";
@@ -7257,7 +7257,7 @@ qemuBuildMemPathStr(virQEMUDriverConfigPtr cfg,
return -1;
}
- if (qemuGetHupageMemPath(cfg, def->mem.hugepages[0].size, &mem_path) < 0)
+ if (qemuGetDomainHupageMemPath(def, cfg, def->mem.hugepages[0].size, &mem_path) < 0)
return -1;
virCommandAddArgList(cmd, "-mem-prealloc", "-mem-path", mem_path, NULL);
diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c
index ccefbe8..ad85551 100644
--- a/src/qemu/qemu_conf.c
+++ b/src/qemu/qemu_conf.c
@@ -1456,7 +1456,7 @@ qemuTranslateSnapshotDiskSourcePool(virConnectPtr conn ATTRIBUTE_UNUSED,
}
char *
-qemuGetHugepagePath(virHugeTLBFSPtr hugepage)
+qemuGetBaseHugepagePath(virHugeTLBFSPtr hugepage)
{
char *ret;
@@ -1467,8 +1467,25 @@ qemuGetHugepagePath(virHugeTLBFSPtr hugepage)
}
+char *
+qemuGetDomainHugepagePath(const virDomainDef *def,
+ virHugeTLBFSPtr hugepage)
+{
+ char *base = qemuGetBaseHugepagePath(hugepage);
+ char *domPath = virDomainObjGetShortName(def);
+ char *ret;
+
+ if (base && domPath)
+ ignore_value(virAsprintf(&ret, "%s/%s", base, domPath));
+ VIR_FREE(domPath);
+ VIR_FREE(base);
+ return ret;
+}
+
+
/**
- * qemuGetDefaultHugepath:
+ * qemuGetDomainDefaultHugepath:
+ * @def: domain definition
* @hugetlbfs: array of configured hugepages
* @nhugetlbfs: number of item in the array
*
@@ -1477,8 +1494,9 @@ qemuGetHugepagePath(virHugeTLBFSPtr hugepage)
* Returns 0 on success, -1 otherwise.
* */
char *
-qemuGetDefaultHugepath(virHugeTLBFSPtr hugetlbfs,
- size_t nhugetlbfs)
+qemuGetDomainDefaultHugepath(const virDomainDef *def,
+ virHugeTLBFSPtr hugetlbfs,
+ size_t nhugetlbfs)
{
size_t i;
@@ -1489,12 +1507,12 @@ qemuGetDefaultHugepath(virHugeTLBFSPtr hugetlbfs,
if (i == nhugetlbfs)
i = 0;
- return qemuGetHugepagePath(&hugetlbfs[i]);
+ return qemuGetDomainHugepagePath(def, &hugetlbfs[i]);
}
/**
- * qemuGetHupageMemPath: Construct HP enabled memory backend path
+ * qemuGetDomainHupageMemPath: Construct HP enabled memory backend path
*
* If no specific hugepage size is requested (@pagesize is zero)
* the default hugepage size is used).
@@ -1504,9 +1522,10 @@ qemuGetDefaultHugepath(virHugeTLBFSPtr hugetlbfs,
* -1 otherwise.
*/
int
-qemuGetHupageMemPath(virQEMUDriverConfigPtr cfg,
- unsigned long long pagesize,
- char **memPath)
+qemuGetDomainHupageMemPath(const virDomainDef *def,
+ virQEMUDriverConfigPtr cfg,
+ unsigned long long pagesize,
+ char **memPath)
{
size_t i = 0;
@@ -1518,8 +1537,9 @@ qemuGetHupageMemPath(virQEMUDriverConfigPtr cfg,
}
if (!pagesize) {
- if (!(*memPath = qemuGetDefaultHugepath(cfg->hugetlbfs,
- cfg->nhugetlbfs)))
+ if (!(*memPath = qemuGetDomainDefaultHugepath(def,
+ cfg->hugetlbfs,
+ cfg->nhugetlbfs)))
return -1;
} else {
for (i = 0; i < cfg->nhugetlbfs; i++) {
@@ -1535,7 +1555,7 @@ qemuGetHupageMemPath(virQEMUDriverConfigPtr cfg,
return -1;
}
- if (!(*memPath = qemuGetHugepagePath(&cfg->hugetlbfs[i])))
+ if (!(*memPath = qemuGetDomainHugepagePath(def, &cfg->hugetlbfs[i])))
return -1;
}
diff --git a/src/qemu/qemu_conf.h b/src/qemu/qemu_conf.h
index f6e3257..d191e10 100644
--- a/src/qemu/qemu_conf.h
+++ b/src/qemu/qemu_conf.h
@@ -335,11 +335,15 @@ virDomainXMLOptionPtr virQEMUDriverCreateXMLConf(virQEMUDriverPtr driver);
int qemuTranslateSnapshotDiskSourcePool(virConnectPtr conn,
virDomainSnapshotDiskDefPtr def);
-char * qemuGetHugepagePath(virHugeTLBFSPtr hugepage);
-char * qemuGetDefaultHugepath(virHugeTLBFSPtr hugetlbfs,
- size_t nhugetlbfs);
+char * qemuGetBaseHugepagePath(virHugeTLBFSPtr hugepage);
+char * qemuGetDomainHugepagePath(const virDomainDef *def,
+ virHugeTLBFSPtr hugepage);
+char * qemuGetDomainDefaultHugepath(const virDomainDef *def,
+ virHugeTLBFSPtr hugetlbfs,
+ size_t nhugetlbfs);
-int qemuGetHupageMemPath(virQEMUDriverConfigPtr cfg,
- unsigned long long pagesize,
- char **memPath);
+int qemuGetDomainHupageMemPath(const virDomainDef *def,
+ virQEMUDriverConfigPtr cfg,
+ unsigned long long pagesize,
+ char **memPath);
#endif /* __QEMUD_CONF_H */
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 29ed16e..b0164e8 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -852,7 +852,7 @@ qemuStateInitialize(bool privileged,
* it, since we can't assume the root mount point has permissions that
* will let our spawned QEMU instances use it. */
for (i = 0; i < cfg->nhugetlbfs; i++) {
- hugepagePath = qemuGetHugepagePath(&cfg->hugetlbfs[i]);
+ hugepagePath = qemuGetBaseHugepagePath(&cfg->hugetlbfs[i]);
if (!hugepagePath)
goto error;
@@ -863,19 +863,10 @@ qemuStateInitialize(bool privileged,
hugepagePath);
goto error;
}
- if (privileged) {
- if (virFileUpdatePerm(cfg->hugetlbfs[i].mnt_dir,
- 0, S_IXGRP | S_IXOTH) < 0)
- goto error;
- if (chown(hugepagePath, cfg->user, cfg->group) < 0) {
- virReportSystemError(errno,
- _("unable to set ownership on %s to %d:%d"),
- hugepagePath,
- (int) cfg->user,
- (int) cfg->group);
- goto error;
- }
- }
+ if (privileged &&
+ virFileUpdatePerm(cfg->hugetlbfs[i].mnt_dir,
+ 0, S_IXGRP | S_IXOTH) < 0)
+ goto error;
VIR_FREE(hugepagePath);
}
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 4b82a97..5e179b9 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -3221,6 +3221,55 @@ qemuProcessReconnectCheckMemAliasOrderMismatch(virDomainObjPtr vm)
}
+static int
+qemuProcessBuildDestroydHugepagesPath(virQEMUDriverPtr driver,
+ virDomainObjPtr vm,
+ bool build)
+{
+ virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
+ char *hugepagePath = NULL;
+ size_t i;
+ int ret = -1;
+
+ if (vm->def->mem.nhugepages) {
+ for (i = 0; i < cfg->nhugetlbfs; i++) {
+ VIR_FREE(hugepagePath);
+ hugepagePath = qemuGetDomainHugepagePath(vm->def, &cfg->hugetlbfs[i]);
+
+ if (!hugepagePath)
+ goto cleanup;
+
+ if (build) {
+ if (virFileMakePathWithMode(hugepagePath, 0700) < 0) {
+ virReportSystemError(errno,
+ _("Unable to create %s"),
+ hugepagePath);
+ goto cleanup;
+ }
+
+ if (virSecurityManagerSetHugepages(driver->securityManager,
+ vm->def, hugepagePath) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ "%s", _("Unable to set huge path in security driver"));
+ VIR_FREE(hugepagePath);
+ goto cleanup;
+ }
+ } else {
+ if (rmdir(hugepagePath) < 0)
+ VIR_WARN("Unable to remove hugepage path: %s (errno=%d)",
+ hugepagePath, errno);
+ }
+ }
+ }
+
+ ret = 0;
+ cleanup:
+ VIR_FREE(hugepagePath);
+ virObjectUnref(cfg);
+ return ret;
+}
+
+
struct qemuProcessReconnectData {
virConnectPtr conn;
virQEMUDriverPtr driver;
@@ -3365,6 +3414,9 @@ qemuProcessReconnect(void *opaque)
goto cleanup;
}
+ if (qemuProcessBuildDestroydHugepagesPath(driver, obj, true) < 0)
+ goto error;
+
if ((qemuDomainAssignAddresses(obj->def, priv->qemuCaps, obj, false)) < 0)
goto error;
@@ -5227,7 +5279,6 @@ qemuProcessPrepareHost(virQEMUDriverPtr driver,
{
int ret = -1;
unsigned int hostdev_flags = 0;
- size_t i;
qemuDomainObjPrivatePtr priv = vm->privateData;
virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
@@ -5259,23 +5310,8 @@ qemuProcessPrepareHost(virQEMUDriverPtr driver,
NULL) < 0)
goto cleanup;
- if (vm->def->mem.nhugepages) {
- for (i = 0; i < cfg->nhugetlbfs; i++) {
- char *hugepagePath = qemuGetHugepagePath(&cfg->hugetlbfs[i]);
-
- if (!hugepagePath)
- goto cleanup;
-
- if (virSecurityManagerSetHugepages(driver->securityManager,
- vm->def, hugepagePath) < 0) {
- virReportError(VIR_ERR_INTERNAL_ERROR,
- "%s", _("Unable to set huge path in security driver"));
- VIR_FREE(hugepagePath);
- goto cleanup;
- }
- VIR_FREE(hugepagePath);
- }
- }
+ if (qemuProcessBuildDestroydHugepagesPath(driver, vm, true) < 0)
+ goto cleanup;
/* Ensure no historical cgroup for this VM is lying around bogus
* settings */
@@ -5953,6 +5989,8 @@ void qemuProcessStop(virQEMUDriverPtr driver,
goto endjob;
}
+ qemuProcessBuildDestroydHugepagesPath(driver, vm, false);
+
vm->def->id = -1;
if (virAtomicIntDecAndTest(&driver->nactive) && driver->inhibitCallback)
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-hugepages-numa.args b/tests/qemuxml2argvdata/qemuxml2argv-hugepages-numa.args
index 7b90784..26e9496 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-hugepages-numa.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-hugepages-numa.args
@@ -11,11 +11,11 @@ QEMU_AUDIO_DRV=spice \
-m size=1048576k,slots=16,maxmem=1099511627776k \
-smp 2,sockets=2,cores=1,threads=1 \
-mem-prealloc \
--mem-path /dev/hugepages2M/libvirt/qemu \
+-mem-path /dev/hugepages2M/libvirt/qemu/-1-fedora \
-numa node,nodeid=0,cpus=0-1,mem=1024 \
-object memory-backend-file,id=memdimm0,prealloc=yes,\
-mem-path=/dev/hugepages1G/libvirt/qemu,size=1073741824,host-nodes=1-3,\
-policy=bind \
+mem-path=/dev/hugepages1G/libvirt/qemu/-1-fedora,size=1073741824,\
+host-nodes=1-3,policy=bind \
-device pc-dimm,node=0,memdev=memdimm0,id=dimm0,slot=0 \
-uuid 63840878-0deb-4095-97e6-fc444d9bc9fa \
-nodefaults \
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages.args b/tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages.args
index 9f0e696..4c11bb7 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages.args
@@ -11,20 +11,20 @@ QEMU_AUDIO_DRV=none \
-m 4096 \
-smp 4,sockets=4,cores=1,threads=1 \
-object memory-backend-file,id=ram-node0,prealloc=yes,\
-mem-path=/dev/hugepages1G/libvirt/qemu,size=1073741824,host-nodes=0-3,\
-policy=bind \
+mem-path=/dev/hugepages1G/libvirt/qemu/-1-QEMUGuest1,size=1073741824,\
+host-nodes=0-3,policy=bind \
-numa node,nodeid=0,cpus=0,memdev=ram-node0 \
-object memory-backend-file,id=ram-node1,prealloc=yes,\
-mem-path=/dev/hugepages2M/libvirt/qemu,size=1073741824,host-nodes=0-3,\
-policy=bind \
+mem-path=/dev/hugepages2M/libvirt/qemu/-1-QEMUGuest1,size=1073741824,\
+host-nodes=0-3,policy=bind \
-numa node,nodeid=1,cpus=1,memdev=ram-node1 \
-object memory-backend-file,id=ram-node2,prealloc=yes,\
-mem-path=/dev/hugepages1G/libvirt/qemu,size=1073741824,host-nodes=0-3,\
-policy=bind \
+mem-path=/dev/hugepages1G/libvirt/qemu/-1-QEMUGuest1,size=1073741824,\
+host-nodes=0-3,policy=bind \
-numa node,nodeid=2,cpus=2,memdev=ram-node2 \
-object memory-backend-file,id=ram-node3,prealloc=yes,\
-mem-path=/dev/hugepages1G/libvirt/qemu,size=1073741824,host-nodes=3,\
-policy=bind \
+mem-path=/dev/hugepages1G/libvirt/qemu/-1-QEMUGuest1,size=1073741824,\
+host-nodes=3,policy=bind \
-numa node,nodeid=3,cpus=3,memdev=ram-node3 \
-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
-nographic \
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages2.args b/tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages2.args
index a37f03d..72a1d8c 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages2.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages2.args
@@ -11,7 +11,7 @@ QEMU_AUDIO_DRV=none \
-m 1024 \
-smp 2,sockets=2,cores=1,threads=1 \
-mem-prealloc \
--mem-path /dev/hugepages2M/libvirt/qemu \
+-mem-path /dev/hugepages2M/libvirt/qemu/-1-SomeDummyHugepagesGu \
-numa node,nodeid=0,cpus=0,mem=256 \
-numa node,nodeid=1,cpus=1,mem=768 \
-uuid ef1bdff4-27f3-4e85-a807-5fb4d58463cc \
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages3.args b/tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages3.args
index 57dd3fa..75cb1de 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages3.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages3.args
@@ -13,7 +13,7 @@ QEMU_AUDIO_DRV=none \
-object memory-backend-ram,id=ram-node0,size=268435456 \
-numa node,nodeid=0,cpus=0,memdev=ram-node0 \
-object memory-backend-file,id=ram-node1,prealloc=yes,\
-mem-path=/dev/hugepages1G/libvirt/qemu,size=805306368 \
+mem-path=/dev/hugepages1G/libvirt/qemu/-1-SomeDummyHugepagesGu,size=805306368 \
-numa node,nodeid=1,cpus=1,memdev=ram-node1 \
-uuid ef1bdff4-27f3-4e85-a807-5fb4d58463cc \
-nographic \
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages5.args b/tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages5.args
index a826149..fb9fa8a 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages5.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages5.args
@@ -10,7 +10,7 @@ QEMU_AUDIO_DRV=none \
-M pc \
-m 1024 \
-mem-prealloc \
--mem-path /dev/hugepages2M/libvirt/qemu \
+-mem-path /dev/hugepages2M/libvirt/qemu/-1-SomeDummyHugepagesGu \
-smp 2,sockets=2,cores=1,threads=1 \
-uuid ef1bdff4-27f3-4e85-a807-5fb4d58463cc \
-nographic \
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-hugepages-shared.args b/tests/qemuxml2argvdata/qemuxml2argv-hugepages-shared.args
index f9fc218..27a6d84 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-hugepages-shared.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-hugepages-shared.args
@@ -11,20 +11,20 @@ QEMU_AUDIO_DRV=none \
-m 4096 \
-smp 4,sockets=4,cores=1,threads=1 \
-object memory-backend-file,id=ram-node0,prealloc=yes,\
-mem-path=/dev/hugepages1G/libvirt/qemu,size=1073741824,host-nodes=0-3,\
-policy=bind \
+mem-path=/dev/hugepages1G/libvirt/qemu/-1-QEMUGuest1,size=1073741824,\
+host-nodes=0-3,policy=bind \
-numa node,nodeid=0,cpus=0,memdev=ram-node0 \
-object memory-backend-file,id=ram-node1,prealloc=yes,\
-mem-path=/dev/hugepages2M/libvirt/qemu,share=yes,size=1073741824,\
+mem-path=/dev/hugepages2M/libvirt/qemu/-1-QEMUGuest1,share=yes,size=1073741824,\
host-nodes=0-3,policy=bind \
-numa node,nodeid=1,cpus=1,memdev=ram-node1 \
-object memory-backend-file,id=ram-node2,prealloc=yes,\
-mem-path=/dev/hugepages1G/libvirt/qemu,share=no,size=1073741824,host-nodes=0-3,\
-policy=bind \
+mem-path=/dev/hugepages1G/libvirt/qemu/-1-QEMUGuest1,share=no,size=1073741824,\
+host-nodes=0-3,policy=bind \
-numa node,nodeid=2,cpus=2,memdev=ram-node2 \
-object memory-backend-file,id=ram-node3,prealloc=yes,\
-mem-path=/dev/hugepages1G/libvirt/qemu,size=1073741824,host-nodes=3,\
-policy=bind \
+mem-path=/dev/hugepages1G/libvirt/qemu/-1-QEMUGuest1,size=1073741824,\
+host-nodes=3,policy=bind \
-numa node,nodeid=3,cpus=3,memdev=ram-node3 \
-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
-nographic \
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-hugepages.args b/tests/qemuxml2argvdata/qemuxml2argv-hugepages.args
index 361c8e5..52d04cd 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-hugepages.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-hugepages.args
@@ -10,7 +10,7 @@ QEMU_AUDIO_DRV=none \
-M pc \
-m 214 \
-mem-prealloc \
--mem-path /dev/hugepages2M/libvirt/qemu \
+-mem-path /dev/hugepages2M/libvirt/qemu/-1-QEMUGuest1 \
-smp 1,sockets=1,cores=1,threads=1 \
-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
-nographic \
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-memory-hotplug-dimm-addr.args b/tests/qemuxml2argvdata/qemuxml2argv-memory-hotplug-dimm-addr.args
index fdbb4c3..6825fa5 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-memory-hotplug-dimm-addr.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-memory-hotplug-dimm-addr.args
@@ -12,8 +12,8 @@ QEMU_AUDIO_DRV=none \
-smp 2,sockets=2,cores=1,threads=1 \
-numa node,nodeid=0,cpus=0-1,mem=214 \
-object memory-backend-file,id=memdimm0,prealloc=yes,\
-mem-path=/dev/hugepages2M/libvirt/qemu,size=536870912,host-nodes=1-3,\
-policy=bind \
+mem-path=/dev/hugepages2M/libvirt/qemu/-1-QEMUGuest1,size=536870912,\
+host-nodes=1-3,policy=bind \
-device pc-dimm,node=0,memdev=memdimm0,id=dimm0,slot=0,addr=4294967296 \
-object memory-backend-ram,id=memdimm2,size=536870912 \
-device pc-dimm,node=0,memdev=memdimm2,id=dimm2,slot=2 \
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-memory-hotplug-dimm.args b/tests/qemuxml2argvdata/qemuxml2argv-memory-hotplug-dimm.args
index 1587aba..321e64e 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-memory-hotplug-dimm.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-memory-hotplug-dimm.args
@@ -14,8 +14,8 @@ QEMU_AUDIO_DRV=none \
-object memory-backend-ram,id=memdimm0,size=536870912 \
-device pc-dimm,node=0,memdev=memdimm0,id=dimm0,slot=0 \
-object memory-backend-file,id=memdimm1,prealloc=yes,\
-mem-path=/dev/hugepages2M/libvirt/qemu,size=536870912,host-nodes=1-3,\
-policy=bind \
+mem-path=/dev/hugepages2M/libvirt/qemu/-1-QEMUGuest1,size=536870912,\
+host-nodes=1-3,policy=bind \
-device pc-dimm,node=0,memdev=memdimm1,id=dimm1,slot=1 \
-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
-nographic \
--
2.8.4
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