[PATCH 9/9] perf: add emulation_faults software perf event support

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This patch adds support and documentation
for the emulation_faults perf event.

Signed-off-by: Nitesh Konkar <nitkon12@xxxxxxxxxxxxxxxxxx>
---
 docs/formatdomain.html.in                   |  7 +++++++
 docs/news.xml                               |  5 +++--
 docs/schemas/domaincommon.rng               |  1 +
 include/libvirt/libvirt-domain.h            | 10 ++++++++++
 src/libvirt-domain.c                        |  3 +++
 src/qemu/qemu_driver.c                      |  1 +
 src/util/virperf.c                          |  5 ++++-
 src/util/virperf.h                          |  1 +
 tests/genericxml2xmlindata/generic-perf.xml |  1 +
 tools/virsh.pod                             |  5 +++++
 10 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 249cfe4..6a83a96 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1945,6 +1945,7 @@
   &lt;event name='page_faults_min' enabled='no'/&gt;
   &lt;event name='page_faults_maj' enabled='no'/&gt;
   &lt;event name='alignment_faults' enabled='no'/&gt;
+  &lt;event name='emulation_faults' enabled='no'/&gt;
 &lt;/perf&gt;
 ...
 </pre>
@@ -2066,6 +2067,12 @@
           platform</td>
       <td><code>perf.alignment_faults</code></td>
     </tr>
+    <tr>
+      <td><code>emulation_faults</code></td>
+      <td>the count of emulation faults by applications running on the
+          platform</td>
+      <td><code>perf.emulation_faults</code></td>
+    </tr>
   </table>
 
     <h3><a name="elementsDevices">Devices</a></h3>
diff --git a/docs/news.xml b/docs/news.xml
index b148b38..e0e1c50 100644
--- a/docs/news.xml
+++ b/docs/news.xml
@@ -138,8 +138,9 @@
           executed, branch misses, bus cycles, stalled frontend
           cpu cycles, stalled backend cpu cycles, ref cpu cycles,
           cpu clock, task clock, page faults, context switches,
-          cpu migrations, page faults min, page faults maj and
-          alignment faults by applications running on the platform.
+          cpu migrations, page faults min, page faults maj,
+          alignment faults and emulation faults by applications
+          running on the platform.
         </description>
       </change>
       <change>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 6782bf5..3781618 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -441,6 +441,7 @@
               <value>page_faults_min</value>
               <value>page_faults_maj</value>
               <value>alignment_faults</value>
+              <value>emulation_faults</value>
             </choice>
           </attribute>
           <attribute name="enabled">
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index 7523872..73974d9 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -2268,6 +2268,16 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
  */
 # define VIR_PERF_PARAM_ALIGNMENT_FAULTS  "alignment_faults"
 
+/**
+ * VIR_PERF_PARAM_EMULATION_FAULTS:
+ *
+ * Macro for typed parameter name that represents emulation_faults
+ * perf event which can be used to measure the count of emulation
+ * faults by applications running on the platform. It corresponds
+ * to the "perf.emulation_faults" field in the *Stats APIs.
+ */
+# define VIR_PERF_PARAM_EMULATION_FAULTS  "emulation_faults"
+
 int virDomainGetPerfEvents(virDomainPtr dom,
                            virTypedParameterPtr *params,
                            int *nparams,
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index bad9fea..36b7baa 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -11271,6 +11271,9 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
  *     "perf.alignment_faults" - The count of alignment faults as unsigned long
  *                              long. It is produced by the alignment_faults
  *                              perf event
+ *     "perf.emulation_faults" - The count of emulation faults as unsigned long
+ *                              long. It is produced by the emulation_faults
+ *                              perf event
  *
  * Note that entire stats groups or individual stat fields may be missing from
  * the output in case they are not supported by the given hypervisor, are not
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 89394be..f47ae92 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9557,6 +9557,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
                                VIR_PERF_PARAM_PAGE_FAULTS_MIN, VIR_TYPED_PARAM_BOOLEAN,
                                VIR_PERF_PARAM_PAGE_FAULTS_MAJ, VIR_TYPED_PARAM_BOOLEAN,
                                VIR_PERF_PARAM_ALIGNMENT_FAULTS, VIR_TYPED_PARAM_BOOLEAN,
+                               VIR_PERF_PARAM_EMULATION_FAULTS, VIR_TYPED_PARAM_BOOLEAN,
                                NULL) < 0)
         return -1;
 
diff --git a/src/util/virperf.c b/src/util/virperf.c
index c25c57a..9a8f211 100644
--- a/src/util/virperf.c
+++ b/src/util/virperf.c
@@ -47,7 +47,7 @@ VIR_ENUM_IMPL(virPerfEvent, VIR_PERF_EVENT_LAST,
               "cpu_clock", "task_clock", "page_faults",
               "context_switches", "cpu_migrations",
               "page_faults_min", "page_faults_maj",
-              "alignment_faults");
+              "alignment_faults", "emulation_faults");
 
 struct virPerfEvent {
     int type;
@@ -140,6 +140,9 @@ static struct virPerfEventAttr attrs[] = {
     {.type = VIR_PERF_EVENT_ALIGNMENT_FAULTS,
      .attrType = PERF_TYPE_SOFTWARE,
      .attrConfig = PERF_COUNT_SW_ALIGNMENT_FAULTS},
+    {.type = VIR_PERF_EVENT_EMULATION_FAULTS,
+     .attrType = PERF_TYPE_SOFTWARE,
+     .attrConfig = PERF_COUNT_SW_EMULATION_FAULTS},
 };
 typedef struct virPerfEventAttr *virPerfEventAttrPtr;
 
diff --git a/src/util/virperf.h b/src/util/virperf.h
index 1c51e50..0ef0d67 100644
--- a/src/util/virperf.h
+++ b/src/util/virperf.h
@@ -55,6 +55,7 @@ typedef enum {
     VIR_PERF_EVENT_PAGE_FAULTS_MIN,   /* Count of minor page faults */
     VIR_PERF_EVENT_PAGE_FAULTS_MAJ,   /* Count of major page faults */
     VIR_PERF_EVENT_ALIGNMENT_FAULTS,   /* Count of alignment faults */
+    VIR_PERF_EVENT_EMULATION_FAULTS,   /* Count of emulation faults */
 
     VIR_PERF_EVENT_LAST
 } virPerfEventType;
diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml
index b48f96c..457aea0 100644
--- a/tests/genericxml2xmlindata/generic-perf.xml
+++ b/tests/genericxml2xmlindata/generic-perf.xml
@@ -34,6 +34,7 @@
     <event name='page_faults_min' enabled='yes'/>
     <event name='page_faults_maj' enabled='yes'/>
     <event name='alignment_faults' enabled='yes'/>
+    <event name='emulation_faults' enabled='yes'/>
   </perf>
   <devices>
   </devices>
diff --git a/tools/virsh.pod b/tools/virsh.pod
index 1f1b9c9..19d02a5 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -954,6 +954,7 @@ I<--perf> returns the statistics of all enabled perf events:
 "perf.page_faults_min" - the count of minor page faults
 "perf.page_faults_maj" - the count of major page faults
 "perf.alignment_faults" - the count of alignment faults
+"perf.emulation_faults" - the count of emulation faults
 
 See the B<perf> command for more details about each event.
 
@@ -2340,6 +2341,10 @@ B<Valid perf event names>
   alignment_faults - Provides the count of alignment faults, that is when
                      the load or store is not aligned properly, by applications
                      running on the platform
+  emulation_faults - Provides the count of emulation faults, that is when
+                     the kernel traps on unimplemented instrucions and
+                     emulates them for user space, for applications running
+                     on the platform
 
 B<Note>: The statistics can be retrieved using the B<domstats> command using
 the I<--perf> flag.
-- 
1.9.3

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