[libvirt] [PATCH 03/10] conf: Add CMT capability to host

[Wang Huaqiang]

CMT capability for each cache bank, includes
-. Maximum CMT monitoring groups(sharing with MBM) could be created,
   which reflects the maximum hardware RMID count.
-. 'cache threshold'.
-. Statistical information of last level cache, the actual cache
   occupancy.

cache is splitted into 'bank's, each bank MAY have different cache
configuration, report cache monitoring capability in unit of cache bank.

cache monitor capability is shown as below:

    <cache>
      <bank id='0' level='3' type='both' size='15' unit='MiB' cpus='0-5'>
        <control granularity='768' unit='KiB' type='code' maxAllocs='8'/>
        <control granularity='768' unit='KiB' type='data' maxAllocs='8'/>
+       <monitor threshold='540672' unit='B' maxAllocs='176'/>
+         <feature name=llc_occupancy/>
+       </monitor>
      </bank>
      <bank id='1' level='3' type='both' size='15' unit='MiB' cpus='6-11'>
        <control granularity='768' unit='KiB' type='code' maxAllocs='8'/>
        <control granularity='768' unit='KiB' type='data' maxAllocs='8'/>
+       <monitor threshold='540672' unit='B' maxAllocs='176'/>
+         <feature name=llc_occupancy/>
+       </monitor>

      </bank>
    </cache>

Signed-off-by: Wang Huaqiang <huaqiang.wang at intel.com>
---
 docs/schemas/capability.rng | 28 ++++++++++++++++++++++++++++
 src/conf/capabilities.c     | 17 +++++++++++++++++
 2 files changed, 45 insertions(+)

diff --git a/docs/schemas/capability.rng b/docs/schemas/capability.rng
index d61515c..67498f1 100644
--- a/docs/schemas/capability.rng
+++ b/docs/schemas/capability.rng
@@ -314,6 +314,24 @@
               </attribute>
             </element>
           </zeroOrMore>
+          <zeroOrMore>
+            <element name='monitor'>
+              <attribute name='threshold'>
+                <ref name='unsignedInt'/>
+              </attribute>
+              <attribute name='unit'>
+                <ref name='unit'/>
+              </attribute>
+              <attribute name='maxAllocs'>
+                <ref name='unsignedInt'/>
+              </attribute>
+              <zeroOrMore>
+                <element name='feature'>
+                  <ref name='monitorFeature'/>
+                </element>
+              </zeroOrMore>
+            </element>
+          </zeroOrMore>
         </element>
       </oneOrMore>
     </element>
@@ -329,6 +347,16 @@
     </attribute>
   </define>
 
+  <define name='monitorFeature'>
+    <attribute name='name'>
+      <choice>
+        <value>llc_occupancy</value>
+        <value>mbm_total_bytes</value>
+        <value>mbm_local_bytes</value>
+      </choice>
+    </attribute>
+  </define>
+
   <define name='memory_bandwidth'>
     <element name='memory_bandwidth'>
       <oneOrMore>
diff --git a/src/conf/capabilities.c b/src/conf/capabilities.c
index 5280348..7932088 100644
--- a/src/conf/capabilities.c
+++ b/src/conf/capabilities.c
@@ -942,6 +942,23 @@ virCapabilitiesFormatCaches(virBufferPtr buf,
                               controls->max_allocation);
         }
 
+        if (bank->monitor &&
+            bank->monitor->nfeatures) {
+            virBufferAsprintf(&childrenBuf,
+                              "<monitor threshold='%u' unit='B' "
+                              "maxAllocs='%u'>\n",
+                              bank->monitor->cache_threshold,
+                              bank->monitor->max_allocation);
+            for (j = 0; j < bank->monitor->nfeatures; j++) {
+                virBufferAdjustIndent(&childrenBuf, 2);
+                virBufferAsprintf(&childrenBuf,
+                                  "<feature name='%s'/>\n",
+                                  bank->monitor->features[j]);
+                virBufferAdjustIndent(&childrenBuf, -2);
+            }
+            virBufferAddLit(&childrenBuf, "</monitor>\n");
+        }
+
         if (virBufferCheckError(&childrenBuf) < 0)
             return -1;
 
-- 
2.7.4