[libvirt] [PATCH 2/5] conf: Report TSC frequency in host CPU capabilities
This patch adds a new
<counter name='tsc' frequency='N' scaling='on|off'/>
element into the host CPU capabilities XML.
Signed-off-by: Jiri Denemark <jdenemar(a)redhat.com>
---
src/conf/cpu_conf.c | 48 +++++++++++++++++++++++++++++++++++++++++++++
src/conf/cpu_conf.h | 2 ++
2 files changed, 50 insertions(+)
diff --git a/src/conf/cpu_conf.c b/src/conf/cpu_conf.c
index bd2beab33e..dc46e7f57a 100644
--- a/src/conf/cpu_conf.c
+++ b/src/conf/cpu_conf.c
@@ -112,6 +112,7 @@ virCPUDefFree(virCPUDefPtr def)
virCPUDefFreeModel(def);
VIR_FREE(def->cache);
+ VIR_FREE(def->tsc);
VIR_FREE(def);
}
@@ -233,6 +234,13 @@ virCPUDefCopyWithoutModel(const virCPUDef *cpu)
*copy->cache = *cpu->cache;
}
+ if (cpu->tsc) {
+ if (VIR_ALLOC(copy->tsc) < 0)
+ goto error;
+
+ *copy->tsc = *cpu->tsc;
+ }
+
return copy;
error:
@@ -286,6 +294,8 @@ virCPUDefParseXML(xmlXPathContextPtr ctxt,
char *cpuMode;
char *fallback = NULL;
char *vendor_id = NULL;
+ char *tscScaling = NULL;
+ virHostCPUTscInfoPtr tsc = NULL;
int ret = -1;
*cpu = NULL;
@@ -402,6 +412,32 @@ virCPUDefParseXML(xmlXPathContextPtr ctxt,
_("invalid microcode version"));
goto cleanup;
}
+
+ if (virXPathBoolean("boolean(./counter[@name='tsc'])", ctxt)
> 0) {
+ if (VIR_ALLOC(tsc) < 0)
+ goto cleanup;
+
+ if (virXPathULongLong("./counter[@name='tsc']/@frequency",
ctxt,
+ &tsc->frequency) < 0) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("Invalid TSC frequency"));
+ goto cleanup;
+ }
+
+ tscScaling =
virXPathString("string(./counter[@name='tsc']/@scaling)",
+ ctxt);
+ if (tscScaling) {
+ int scaling = virTristateBoolTypeFromString(tscScaling);
+ if (scaling < 0) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("Invalid TSC scaling attribute"));
+ goto cleanup;
+ }
+ tsc->scaling = scaling;
+ }
+
+ VIR_STEAL_PTR(def->tsc, tsc);
+ }
}
if (!(def->model = virXPathString("string(./model[1])", ctxt))
&&
@@ -587,6 +623,8 @@ virCPUDefParseXML(xmlXPathContextPtr ctxt,
VIR_FREE(fallback);
VIR_FREE(vendor_id);
VIR_FREE(nodes);
+ VIR_FREE(tscScaling);
+ VIR_FREE(tsc);
virCPUDefFree(def);
return ret;
}
@@ -744,6 +782,16 @@ virCPUDefFormatBuf(virBufferPtr buf,
virBufferAsprintf(buf, "<microcode version='%u'/>\n",
def->microcodeVersion);
+ if (def->type == VIR_CPU_TYPE_HOST && def->tsc) {
+ virBufferAddLit(buf, "<counter name='tsc'");
+ virBufferAsprintf(buf, " frequency='%llu'",
def->tsc->frequency);
+ if (def->tsc->scaling) {
+ virBufferAsprintf(buf, " scaling='%s'",
+ virTristateBoolTypeToString(def->tsc->scaling));
+ }
+ virBufferAddLit(buf, "/>\n");
+ }
+
if (def->sockets && def->cores && def->threads) {
virBufferAddLit(buf, "<topology");
virBufferAsprintf(buf, " sockets='%u'", def->sockets);
diff --git a/src/conf/cpu_conf.h b/src/conf/cpu_conf.h
index c98db65693..51bf744fab 100644
--- a/src/conf/cpu_conf.h
+++ b/src/conf/cpu_conf.h
@@ -28,6 +28,7 @@
# include "virarch.h"
# include "numa_conf.h"
# include "virenum.h"
+# include "virhostcpu.h"
# define VIR_CPU_VENDOR_ID_LENGTH 12
@@ -139,6 +140,7 @@ struct _virCPUDef {
size_t nfeatures_max;
virCPUFeatureDefPtr features;
virCPUCacheDefPtr cache;
+ virHostCPUTscInfoPtr tsc;
};
--
2.21.0