[libvirt] [RFC PATCH 01/17] qemu: setup shared memory without explicit numa configuration
marcandre.lureau at redhat.com
marcandre.lureau at redhat.com
Fri Jul 13 13:28:08 UTC 2018
From: Marc-André Lureau <marcandre.lureau at redhat.com>
When a domain is configured with 'shared' memory backing:
<memoryBacking>
<access mode='shared'/>
</memoryBacking>
But no explicit NUMA configuration, let's configure a shared memory
backend associated with default -numa.
Signed-off-by: Marc-André Lureau <marcandre.lureau at redhat.com>
---
src/qemu/qemu_command.c | 100 ++++++++++++------
.../fd-memory-no-numa-topology.args | 4 +
2 files changed, 73 insertions(+), 31 deletions(-)
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 44ae8dcef7..f1235099b2 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -3254,26 +3254,21 @@ qemuBuildMemoryBackendProps(virJSONValuePtr *backendProps,
static int
-qemuBuildMemoryCellBackendStr(virDomainDefPtr def,
- virQEMUDriverConfigPtr cfg,
- size_t cell,
- qemuDomainObjPrivatePtr priv,
- virBufferPtr buf)
+qemuBuildMemoryBackendStr(virDomainDefPtr def,
+ virQEMUDriverConfigPtr cfg,
+ const char *alias,
+ int targetNode,
+ unsigned long long memsize,
+ qemuDomainObjPrivatePtr priv,
+ virBufferPtr buf)
{
virJSONValuePtr props = NULL;
- char *alias = NULL;
- int ret = -1;
- int rc;
virDomainMemoryDef mem = { 0 };
- unsigned long long memsize = virDomainNumaGetNodeMemorySize(def->numa,
- cell);
-
- if (virAsprintf(&alias, "ram-node%zu", cell) < 0)
- goto cleanup;
+ int rc, ret = -1;
mem.size = memsize;
- mem.targetNode = cell;
- mem.info.alias = alias;
+ mem.targetNode = targetNode;
+ mem.info.alias = (char *)alias;
if ((rc = qemuBuildMemoryBackendProps(&props, alias, cfg, priv->qemuCaps,
def, &mem, priv->autoNodeset, false)) < 0)
@@ -3284,9 +3279,30 @@ qemuBuildMemoryCellBackendStr(virDomainDefPtr def,
ret = rc;
+cleanup:
+ virJSONValueFree(props);
+ return ret;
+}
+
+
+static int
+qemuBuildMemoryCellBackendStr(virDomainDefPtr def,
+ virQEMUDriverConfigPtr cfg,
+ size_t cell,
+ qemuDomainObjPrivatePtr priv,
+ virBufferPtr buf)
+{
+ char *alias = NULL;
+ int ret = -1;
+ unsigned long long memsize = virDomainNumaGetNodeMemorySize(def->numa, cell);
+
+ if (virAsprintf(&alias, "ram-node%zu", cell) < 0)
+ goto cleanup;
+
+ ret = qemuBuildMemoryBackendStr(def, cfg, alias, cell, memsize, priv, buf);
+
cleanup:
VIR_FREE(alias);
- virJSONValueFree(props);
return ret;
}
@@ -7590,6 +7606,17 @@ qemuBuildNumaArgStr(virQEMUDriverConfigPtr cfg,
size_t ncells = virDomainNumaGetNodeCount(def->numa);
const long system_page_size = virGetSystemPageSizeKB();
bool numa_distances = false;
+ bool implicit = false;
+
+ if (ncells == 0) {
+ if (def->mem.access == VIR_DOMAIN_MEMORY_ACCESS_SHARED) {
+ ncells = 1;
+ implicit = true;
+ } else {
+ ret = 0;
+ goto cleanup;
+ }
+ }
if (virDomainNumatuneHasPerNodeBinding(def->numa) &&
!(virQEMUCapsGet(qemuCaps, QEMU_CAPS_OBJECT_MEMORY_RAM) ||
@@ -7645,14 +7672,22 @@ qemuBuildNumaArgStr(virQEMUDriverConfigPtr cfg,
if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_OBJECT_MEMORY_RAM) ||
virQEMUCapsGet(qemuCaps, QEMU_CAPS_OBJECT_MEMORY_FILE)) {
- if ((rc = qemuBuildMemoryCellBackendStr(def, cfg, i, priv,
- &nodeBackends[i])) < 0)
+
+ if (implicit)
+ rc = qemuBuildMemoryBackendStr(def, cfg, "ram-node", -1,
+ def->mem.total_memory,
+ priv, &nodeBackends[i]);
+ else
+ rc = qemuBuildMemoryCellBackendStr(def, cfg, i,
+ priv, &nodeBackends[i]);
+ if (rc < 0)
goto cleanup;
if (rc == 0)
needBackend = true;
} else {
- if (virDomainNumaGetNodeMemoryAccessMode(def->numa, i)) {
+ if (implicit ||
+ virDomainNumaGetNodeMemoryAccessMode(def->numa, i)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("Shared memory mapping is not supported "
"with this QEMU"));
@@ -7667,15 +7702,18 @@ qemuBuildNumaArgStr(virQEMUDriverConfigPtr cfg,
for (i = 0; i < ncells; i++) {
VIR_FREE(cpumask);
- if (!(cpumask = virBitmapFormat(virDomainNumaGetNodeCpumask(def->numa, i))))
- goto cleanup;
- if (strchr(cpumask, ',') &&
- !virQEMUCapsGet(qemuCaps, QEMU_CAPS_NUMA)) {
- virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
- _("disjoint NUMA cpu ranges are not supported "
- "with this QEMU"));
- goto cleanup;
+ if (!implicit) {
+ if (!(cpumask = virBitmapFormat(virDomainNumaGetNodeCpumask(def->numa, i))))
+ goto cleanup;
+
+ if (strchr(cpumask, ',') &&
+ !virQEMUCapsGet(qemuCaps, QEMU_CAPS_NUMA)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("disjoint NUMA cpu ranges are not supported "
+ "with this QEMU"));
+ goto cleanup;
+ }
}
if (needBackend) {
@@ -7694,7 +7732,8 @@ qemuBuildNumaArgStr(virQEMUDriverConfigPtr cfg,
}
if (needBackend)
- virBufferAsprintf(&buf, ",memdev=ram-node%zu", i);
+ virBufferAsprintf(&buf, implicit ?
+ ",memdev=ram-node" : ",memdev=ram-node%zu", i);
else
virBufferAsprintf(&buf, ",mem=%llu",
virDomainNumaGetNodeMemorySize(def->numa, i) / 1024);
@@ -7717,7 +7756,7 @@ qemuBuildNumaArgStr(virQEMUDriverConfigPtr cfg,
break;
}
- if (numa_distances) {
+ if (!implicit && numa_distances) {
if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_NUMA_DIST)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("setting NUMA distances is not "
@@ -10303,8 +10342,7 @@ qemuBuildCommandLine(virQEMUDriverPtr driver,
if (qemuBuildIOThreadCommandLine(cmd, def) < 0)
goto error;
- if (virDomainNumaGetNodeCount(def->numa) &&
- qemuBuildNumaArgStr(cfg, def, cmd, priv) < 0)
+ if (qemuBuildNumaArgStr(cfg, def, cmd, priv) < 0)
goto error;
if (qemuBuildMemoryDeviceCommandLine(cmd, cfg, def, priv) < 0)
diff --git a/tests/qemuxml2argvdata/fd-memory-no-numa-topology.args b/tests/qemuxml2argvdata/fd-memory-no-numa-topology.args
index bd88daaa3b..400fb39cc6 100644
--- a/tests/qemuxml2argvdata/fd-memory-no-numa-topology.args
+++ b/tests/qemuxml2argvdata/fd-memory-no-numa-topology.args
@@ -11,6 +11,10 @@ QEMU_AUDIO_DRV=none \
-m 14336 \
-mem-prealloc \
-smp 8,sockets=8,cores=1,threads=1 \
+-object memory-backend-file,id=ram-node,\
+mem-path=/var/lib/libvirt/qemu/ram/libvirt/qemu/-1-instance-00000092/ram-node,\
+share=yes,size=15032385536 \
+-numa node,nodeid=0,memdev=ram-node \
-uuid 126f2720-6f8e-45ab-a886-ec9277079a67 \
-display none \
-no-user-config \
--
2.18.0.129.ge3331758f1
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