[PATCH v3 2/3] qemu: Implement the HTM pSeries feature

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https://bugzilla.redhat.com/show_bug.cgi?id=1525599
Signed-off-by: Andrea Bolognani <abologna@xxxxxxxxxx>
---
 docs/formatdomain.html.in                     |  8 ++++++++
 docs/schemas/domaincommon.rng                 |  5 +++++
 src/conf/domain_conf.c                        | 19 ++++++++++++++++++
 src/conf/domain_conf.h                        |  1 +
 src/qemu/qemu_command.c                       | 20 +++++++++++++++++++
 src/qemu/qemu_domain.c                        | 13 ++++++++++++
 tests/qemuxml2argvdata/pseries-features.args  |  2 +-
 tests/qemuxml2argvdata/pseries-features.xml   |  1 +
 tests/qemuxml2argvtest.c                      |  1 +
 tests/qemuxml2xmloutdata/pseries-features.xml |  1 +
 tests/qemuxml2xmltest.c                       |  1 +
 11 files changed, 71 insertions(+), 1 deletion(-)

diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 0d68596991..73db315c4f 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1929,6 +1929,7 @@
   &lt;smm state='on'&gt;
     &lt;tseg unit='MiB'&gt;48&lt;/tseg&gt;
   &lt;/smm&gt;
+  &lt;htm state='on'/&gt;
 &lt;/features&gt;
 ...</pre>
 
@@ -2162,6 +2163,13 @@
       <dd>Enable QEMU vmcoreinfo device to let the guest kernel save debug
           details. <span class="since">Since 4.4.0</span> (QEMU only)
       </dd>
+      <dt><code>htm</code></dt>
+      <dd>Configure HTM (Hardware Transational Memory) availability for
+          pSeries guests. Possible values for the <code>state</code> attribute
+          are <code>on</code> and <code>off</code>. If the attribute is not
+          defined, the hypervisor default will be used.
+          <span class="since">Since 4.5.0</span> (QEMU/KVM only)
+      </dd>
     </dl>
 
     <h3><a id="elementsTime">Time keeping</a></h3>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 450e8ac77b..3dd1bd7974 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -4906,6 +4906,11 @@
           <optional>
             <ref name="vmcoreinfo"/>
           </optional>
+          <optional>
+            <element name="htm">
+              <ref name="featurestate"/>
+            </element>
+          </optional>
         </interleave>
       </element>
     </optional>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index d8cb7f37f3..ea01d08a3c 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -152,6 +152,7 @@ VIR_ENUM_IMPL(virDomainFeature, VIR_DOMAIN_FEATURE_LAST,
               "ioapic",
               "hpt",
               "vmcoreinfo",
+              "htm",
 );
 
 VIR_ENUM_IMPL(virDomainCapabilitiesPolicy, VIR_DOMAIN_CAPABILITIES_POLICY_LAST,
@@ -19827,6 +19828,22 @@ virDomainDefParseXML(xmlDocPtr xml,
             }
             break;
 
+        case VIR_DOMAIN_FEATURE_HTM:
+            if (!(tmp = virXMLPropString(nodes[i], "state"))) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                               _("missing state attribute '%s' of feature '%s'"),
+                               tmp, virDomainFeatureTypeToString(val));
+                goto error;
+            }
+            if ((def->features[val] = virTristateSwitchTypeFromString(tmp)) < 0) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                               _("unknown state attribute '%s' of feature '%s'"),
+                               tmp, virDomainFeatureTypeToString(val));
+                goto error;
+            }
+            VIR_FREE(tmp);
+            break;
+
         /* coverity[dead_error_begin] */
         case VIR_DOMAIN_FEATURE_LAST:
             break;
@@ -21961,6 +21978,7 @@ virDomainDefFeaturesCheckABIStability(virDomainDefPtr src,
         case VIR_DOMAIN_FEATURE_VMPORT:
         case VIR_DOMAIN_FEATURE_SMM:
         case VIR_DOMAIN_FEATURE_VMCOREINFO:
+        case VIR_DOMAIN_FEATURE_HTM:
             if (src->features[i] != dst->features[i]) {
                 virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                                _("State of feature '%s' differs: "
@@ -27626,6 +27644,7 @@ virDomainDefFormatInternal(virDomainDefPtr def,
             case VIR_DOMAIN_FEATURE_PMU:
             case VIR_DOMAIN_FEATURE_PVSPINLOCK:
             case VIR_DOMAIN_FEATURE_VMPORT:
+            case VIR_DOMAIN_FEATURE_HTM:
                 switch ((virTristateSwitch) def->features[i]) {
                 case VIR_TRISTATE_SWITCH_LAST:
                 case VIR_TRISTATE_SWITCH_ABSENT:
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 0924fc4f3c..a41431ccf9 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -1771,6 +1771,7 @@ typedef enum {
     VIR_DOMAIN_FEATURE_IOAPIC,
     VIR_DOMAIN_FEATURE_HPT,
     VIR_DOMAIN_FEATURE_VMCOREINFO,
+    VIR_DOMAIN_FEATURE_HTM,
 
     VIR_DOMAIN_FEATURE_LAST
 } virDomainFeature;
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index a357d2199c..5342c08f19 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -7291,6 +7291,26 @@ qemuBuildMachineCommandLine(virCommandPtr cmd,
         }
     }
 
+    if (def->features[VIR_DOMAIN_FEATURE_HTM] != VIR_TRISTATE_SWITCH_ABSENT) {
+        const char *str;
+
+        if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_MACHINE_PSERIES_CAP_HTM)) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("HTM configuration is not supported by this "
+                             "QEMU binary"));
+            goto cleanup;
+        }
+
+        str = virTristateSwitchTypeToString(def->features[VIR_DOMAIN_FEATURE_HTM]);
+        if (!str) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("Invalid setting for HTM state"));
+            goto cleanup;
+        }
+
+        virBufferAsprintf(&buf, ",cap-htm=%s", str);
+    }
+
     if (cpu && cpu->model &&
         cpu->mode == VIR_CPU_MODE_HOST_MODEL &&
         qemuDomainIsPSeries(def) &&
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 6d203e1f2e..baf11b4532 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -3846,6 +3846,19 @@ qemuDomainDefValidateFeatures(const virDomainDef *def,
             }
             break;
 
+        case VIR_DOMAIN_FEATURE_HTM:
+            if (def->features[i] != VIR_TRISTATE_SWITCH_ABSENT &&
+                !qemuDomainIsPSeries(def)) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                               _("The '%s' feature is not supported for "
+                                 "architecture '%s' or machine type '%s'"),
+                               featureName,
+                               virArchToString(def->os.arch),
+                               def->os.machine);
+                return -1;
+            }
+            break;
+
         case VIR_DOMAIN_FEATURE_ACPI:
         case VIR_DOMAIN_FEATURE_APIC:
         case VIR_DOMAIN_FEATURE_PAE:
diff --git a/tests/qemuxml2argvdata/pseries-features.args b/tests/qemuxml2argvdata/pseries-features.args
index 12c14715c6..226d43df44 100644
--- a/tests/qemuxml2argvdata/pseries-features.args
+++ b/tests/qemuxml2argvdata/pseries-features.args
@@ -8,7 +8,7 @@ QEMU_AUDIO_DRV=none \
 -name guest \
 -S \
 -machine pseries,accel=tcg,usb=off,dump-guest-core=off,resize-hpt=required,\
-cap-hpt-max-page-size=1048576k \
+cap-hpt-max-page-size=1048576k,cap-htm=on \
 -m 512 \
 -smp 1,sockets=1,cores=1,threads=1 \
 -uuid 1ccfd97d-5eb4-478a-bbe6-88d254c16db7 \
diff --git a/tests/qemuxml2argvdata/pseries-features.xml b/tests/qemuxml2argvdata/pseries-features.xml
index 30cee5b81c..5c842fe87b 100644
--- a/tests/qemuxml2argvdata/pseries-features.xml
+++ b/tests/qemuxml2argvdata/pseries-features.xml
@@ -10,6 +10,7 @@
     <hpt resizing='required'>
       <maxpagesize unit='GiB'>1</maxpagesize>
     </hpt>
+    <htm state='on'/>
   </features>
   <devices>
     <emulator>/usr/bin/qemu-system-ppc64</emulator>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index ac9593acbe..e64813e430 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -1850,6 +1850,7 @@ mymain(void)
     DO_TEST("pseries-features",
             QEMU_CAPS_DEVICE_SPAPR_PCI_HOST_BRIDGE,
             QEMU_CAPS_MACHINE_PSERIES_CAP_HPT_MAX_PAGE_SIZE,
+            QEMU_CAPS_MACHINE_PSERIES_CAP_HTM,
             QEMU_CAPS_MACHINE_PSERIES_RESIZE_HPT);
     DO_TEST_FAILURE("pseries-features",
                     QEMU_CAPS_DEVICE_SPAPR_PCI_HOST_BRIDGE);
diff --git a/tests/qemuxml2xmloutdata/pseries-features.xml b/tests/qemuxml2xmloutdata/pseries-features.xml
index f36705f011..55a44c75a0 100644
--- a/tests/qemuxml2xmloutdata/pseries-features.xml
+++ b/tests/qemuxml2xmloutdata/pseries-features.xml
@@ -12,6 +12,7 @@
     <hpt resizing='required'>
       <maxpagesize unit='KiB'>1048576</maxpagesize>
     </hpt>
+    <htm state='on'/>
   </features>
   <clock offset='utc'/>
   <on_poweroff>destroy</on_poweroff>
diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
index eac6d5b073..bbb995656e 100644
--- a/tests/qemuxml2xmltest.c
+++ b/tests/qemuxml2xmltest.c
@@ -620,6 +620,7 @@ mymain(void)
     DO_TEST("pseries-features",
             QEMU_CAPS_DEVICE_SPAPR_PCI_HOST_BRIDGE,
             QEMU_CAPS_MACHINE_PSERIES_CAP_HPT_MAX_PAGE_SIZE,
+            QEMU_CAPS_MACHINE_PSERIES_CAP_HTM,
             QEMU_CAPS_MACHINE_PSERIES_RESIZE_HPT);
 
     DO_TEST("pseries-serial-native",
-- 
2.17.1

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