qemu: Implement the IBS pSeries feature

This patch adds the implementation of the IBS pSeries feature,
using the QEMU_CAPS_MACHINE_PSERIES_CAP_IBS capability added
in the previous patch.

IBS can have the following values: "broken", "workaround",
"fixed-ibs", "fixed-ccd" and "fixed-na".

This is the XML format for the cap:

<features>
  <ibs value='fixed-ibs'/>
</features>
Signed-off-by: NDaniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NMichal Privoznik <mprivozn@redhat.com>

docs/formatdomain.html.in

@@ -2080,6 +2080,7 @@
   <msrs unknown='ignore'/>
   <cfpc value='workaround'/>
   <sbbc value='workaround'/>
+  <ibs value='fixed-na'/>
 </features>
 ...</pre>
 
@@ -2428,6 +2429,19 @@
           default will be used.
           <span class="since">Since 6.3.0</span> (QEMU/KVM only)
       </dd>
+      <dt><code>ibs</code></dt>
+      <dd>Configure ibs (Indirect Branch Speculation) availability for
+          pSeries guests.
+          Possible values for the <code>value</code> attribute
+          are <code>broken</code> (no protection), <code>workaround</code>
+          (count cache flush), <code>fixed-ibs</code> (fixed by
+          serializing indirect branches), <code>fixed-ccd</code> (fixed by
+          disabling the cache count) and <code>fixed-na (fixed in
+          hardware - no longer applicable)</code>.
+          If the attribute is not defined, the hypervisor
+          default will be used.
+          <span class="since">Since 6.3.0</span> (QEMU/KVM only)
+      </dd>
     </dl>
 
     <h3><a id="elementsTime">Time keeping</a></h3>

docs/schemas/domaincommon.rng

@@ -5440,6 +5440,9 @@
           <optional>
             <ref name="sbbc"/>
           </optional>
+          <optional>
+            <ref name="ibs"/>
+          </optional>
         </interleave>
       </element>
     </optional>
@@ -5723,6 +5726,20 @@
     </element>
   </define>
 
+  <define name="ibs">
+    <element name="ibs">
+      <attribute name="value">
+        <choice>
+          <value>broken</value>
+          <value>workaround</value>
+          <value>fixed-ibs</value>
+          <value>fixed-ccd</value>
+          <value>fixed-na</value>
+        </choice>
+      </attribute>
+    </element>
+  </define>
+
   <define name="address">
     <element name="address">
       <choice>

src/conf/domain_conf.c

@@ -176,6 +176,7 @@ VIR_ENUM_IMPL(virDomainFeature,
               "xen",
               "cfpc",
               "sbbc",
+              "ibs",
 );
 
 VIR_ENUM_IMPL(virDomainCapabilitiesPolicy,
@@ -1284,6 +1285,16 @@ VIR_ENUM_IMPL(virDomainSBBC,
               "fixed",
 );
 
+VIR_ENUM_IMPL(virDomainIBS,
+              VIR_DOMAIN_IBS_LAST,
+              "none",
+              "broken",
+              "workaround",
+              "fixed-ibs",
+              "fixed-ccd",
+              "fixed-na",
+);
+
 /* Internal mapping: subset of block job types that can be present in
  * <mirror> XML (remaining types are not two-phase). */
 VIR_ENUM_DECL(virDomainBlockJob);
@@ -19374,6 +19385,21 @@ virDomainFeaturesDefParse(virDomainDefPtr def,
             }
             break;
 
+        case VIR_DOMAIN_FEATURE_IBS:
+            tmp = virXMLPropString(nodes[i], "value");
+            if (tmp) {
+                int value = virDomainIBSTypeFromString(tmp);
+                if (value < 0 || value == VIR_DOMAIN_IBS_NONE) {
+                    virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                                   _("Unknown value: %s"),
+                                   tmp);
+                    goto error;
+                }
+                def->features[val] = value;
+                VIR_FREE(tmp);
+            }
+            break;
+
         case VIR_DOMAIN_FEATURE_HTM:
         case VIR_DOMAIN_FEATURE_NESTED_HV:
         case VIR_DOMAIN_FEATURE_CCF_ASSIST:
@@ -23449,6 +23475,18 @@ virDomainDefFeaturesCheckABIStability(virDomainDefPtr src,
             }
             break;
 
+        case VIR_DOMAIN_FEATURE_IBS:
+            if (src->features[i] != dst->features[i]) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                               _("State of feature '%s' differs: "
+                                 "source: '%s=%s', destination: '%s=%s'"),
+                               featureName,
+                               "value", virDomainIBSTypeToString(src->features[i]),
+                               "value", virDomainIBSTypeToString(dst->features[i]));
+                return false;
+            }
+            break;
+
         case VIR_DOMAIN_FEATURE_MSRS:
             break;
 
@@ -29299,6 +29337,14 @@ virDomainDefFormatFeatures(virBufferPtr buf,
                               virDomainSBBCTypeToString(def->features[i]));
             break;
 
+        case VIR_DOMAIN_FEATURE_IBS:
+            if (def->features[i] == VIR_DOMAIN_IBS_NONE)
+                break;
+
+            virBufferAsprintf(&childBuf, "<ibs value='%s'/>\n",
+                              virDomainIBSTypeToString(def->features[i]));
+            break;
+
         /* coverity[dead_error_begin] */
         case VIR_DOMAIN_FEATURE_LAST:
             break;

src/conf/domain_conf.h

@@ -1818,6 +1818,7 @@ typedef enum {
     VIR_DOMAIN_FEATURE_XEN,
     VIR_DOMAIN_FEATURE_CFPC,
     VIR_DOMAIN_FEATURE_SBBC,
+    VIR_DOMAIN_FEATURE_IBS,
 
     VIR_DOMAIN_FEATURE_LAST
 } virDomainFeature;
@@ -2011,6 +2012,19 @@ typedef enum {
 
 VIR_ENUM_DECL(virDomainSBBC);
 
+typedef enum {
+    VIR_DOMAIN_IBS_NONE = 0,
+    VIR_DOMAIN_IBS_BROKEN,
+    VIR_DOMAIN_IBS_WORKAROUND,
+    VIR_DOMAIN_IBS_FIXEDIBS,
+    VIR_DOMAIN_IBS_FIXEDCCD,
+    VIR_DOMAIN_IBS_FIXEDNA,
+
+    VIR_DOMAIN_IBS_LAST
+} virDomainIBS;
+
+VIR_ENUM_DECL(virDomainIBS);
+
 /* Operating system configuration data & machine / arch */
 struct _virDomainOSEnv {
     char *name;

src/libvirt_private.syms

@@ -456,6 +456,8 @@ virDomainHubTypeFromString;
 virDomainHubTypeToString;
 virDomainHypervTypeFromString;
 virDomainHypervTypeToString;
+virDomainIBSTypeFromString;
+virDomainIBSTypeToString;
 virDomainInputBusTypeToString;
 virDomainInputDefFind;
 virDomainInputDefFree;

src/qemu/qemu_command.c

@@ -7181,6 +7181,11 @@ qemuBuildMachineCommandLine(virCommandPtr cmd,
         virBufferAsprintf(&buf, ",cap-sbbc=%s", str);
     }
 
+    if (def->features[VIR_DOMAIN_FEATURE_IBS] != VIR_DOMAIN_IBS_NONE) {
+        const char *str = virDomainIBSTypeToString(def->features[VIR_DOMAIN_FEATURE_IBS]);
+        virBufferAsprintf(&buf, ",cap-ibs=%s", str);
+    }
+
     if (cpu && cpu->model &&
         cpu->mode == VIR_CPU_MODE_HOST_MODEL &&
         qemuDomainIsPSeries(def) &&

src/qemu/qemu_validate.c

@@ -156,6 +156,16 @@ qemuValidateDomainDefPSeriesFeature(const virDomainDef *def,
             return -1;
         }
 
+        break;
+
+    case VIR_DOMAIN_FEATURE_IBS:
+        if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_MACHINE_PSERIES_CAP_IBS)) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("ibs configuration is not supported by "
+                             "this QEMU binary"));
+            return -1;
+        }
+
         break;
     }
 
@@ -216,6 +226,7 @@ qemuValidateDomainDefFeatures(const virDomainDef *def,
         case VIR_DOMAIN_FEATURE_CCF_ASSIST:
         case VIR_DOMAIN_FEATURE_CFPC:
         case VIR_DOMAIN_FEATURE_SBBC:
+        case VIR_DOMAIN_FEATURE_IBS:
             if (qemuValidateDomainDefPSeriesFeature(def, qemuCaps, i) < 0)
                 return -1;
             break;

tests/qemuxml2argvdata/pseries-features.args

@@ -12,7 +12,7 @@ QEMU_AUDIO_DRV=none \
 -S \
 -machine pseries,accel=tcg,usb=off,dump-guest-core=off,resize-hpt=required,\
 cap-hpt-max-page-size=1048576k,cap-htm=on,cap-nested-hv=off,cap-ccf-assist=on,\
-cap-cfpc=fixed,cap-sbbc=broken \
+cap-cfpc=fixed,cap-sbbc=broken,cap-ibs=fixed-ccd \
 -m 512 \
 -realtime mlock=off \
 -smp 1,sockets=1,cores=1,threads=1 \

tests/qemuxml2argvdata/pseries-features.xml

@@ -15,6 +15,7 @@
     <ccf-assist state='on'/>
     <cfpc value='fixed'/>
     <sbbc value='broken'/>
+    <ibs value='fixed-ccd'/>
   </features>
   <devices>
     <emulator>/usr/bin/qemu-system-ppc64</emulator>

tests/qemuxml2argvtest.c

@@ -1966,6 +1966,7 @@ mymain(void)
             QEMU_CAPS_MACHINE_PSERIES_CAP_CCF_ASSIST,
             QEMU_CAPS_MACHINE_PSERIES_CAP_CFPC,
             QEMU_CAPS_MACHINE_PSERIES_CAP_SBBC,
+            QEMU_CAPS_MACHINE_PSERIES_CAP_IBS,
             QEMU_CAPS_MACHINE_PSERIES_RESIZE_HPT);
 
     /* parse error: no QEMU_CAPS_MACHINE_PSERIES_RESIZE_HPT */
@@ -1976,7 +1977,8 @@ mymain(void)
                         QEMU_CAPS_MACHINE_PSERIES_CAP_NESTED_HV,
                         QEMU_CAPS_MACHINE_PSERIES_CAP_CCF_ASSIST,
                         QEMU_CAPS_MACHINE_PSERIES_CAP_CFPC,
-                        QEMU_CAPS_MACHINE_PSERIES_CAP_SBBC);
+                        QEMU_CAPS_MACHINE_PSERIES_CAP_SBBC,
+                        QEMU_CAPS_MACHINE_PSERIES_CAP_IBS);
 
     /* parse error: no QEMU_CAPS_MACHINE_PSERIES_CAP_HPT_MAX_PAGE_SIZE */
     DO_TEST_PARSE_ERROR("pseries-features",
@@ -1986,6 +1988,7 @@ mymain(void)
                         QEMU_CAPS_MACHINE_PSERIES_CAP_CCF_ASSIST,
                         QEMU_CAPS_MACHINE_PSERIES_CAP_CFPC,
                         QEMU_CAPS_MACHINE_PSERIES_CAP_SBBC,
+                        QEMU_CAPS_MACHINE_PSERIES_CAP_IBS,
                         QEMU_CAPS_MACHINE_PSERIES_RESIZE_HPT);
 
     /* parse error: no QEMU_CAPS_MACHINE_PSERIES_CAP_HTM */
@@ -1996,6 +1999,7 @@ mymain(void)
                         QEMU_CAPS_MACHINE_PSERIES_CAP_CCF_ASSIST,
                         QEMU_CAPS_MACHINE_PSERIES_CAP_CFPC,
                         QEMU_CAPS_MACHINE_PSERIES_CAP_SBBC,
+                        QEMU_CAPS_MACHINE_PSERIES_CAP_IBS,
                         QEMU_CAPS_MACHINE_PSERIES_RESIZE_HPT);
 
     /* parse error: no QEMU_CAPS_MACHINE_PSERIES_CAP_NESTED_HV */
@@ -2006,6 +2010,7 @@ mymain(void)
                         QEMU_CAPS_MACHINE_PSERIES_CAP_CCF_ASSIST,
                         QEMU_CAPS_MACHINE_PSERIES_CAP_CFPC,
                         QEMU_CAPS_MACHINE_PSERIES_CAP_SBBC,
+                        QEMU_CAPS_MACHINE_PSERIES_CAP_IBS,
                         QEMU_CAPS_MACHINE_PSERIES_RESIZE_HPT);
 
     /* parse error: no QEMU_CAPS_MACHINE_PSERIES_CAP_CCF_ASSIST */
@@ -2016,6 +2021,7 @@ mymain(void)
                         QEMU_CAPS_MACHINE_PSERIES_CAP_NESTED_HV,
                         QEMU_CAPS_MACHINE_PSERIES_CAP_CFPC,
                         QEMU_CAPS_MACHINE_PSERIES_CAP_SBBC,
+                        QEMU_CAPS_MACHINE_PSERIES_CAP_IBS,
                         QEMU_CAPS_MACHINE_PSERIES_RESIZE_HPT);
 
     /* parse error: no QEMU_CAPS_MACHINE_PSERIES_CFPC */
@@ -2026,7 +2032,8 @@ mymain(void)
                         QEMU_CAPS_MACHINE_PSERIES_CAP_HTM,
                         QEMU_CAPS_MACHINE_PSERIES_CAP_NESTED_HV,
                         QEMU_CAPS_MACHINE_PSERIES_CAP_CCF_ASSIST,
-                        QEMU_CAPS_MACHINE_PSERIES_CAP_SBBC);
+                        QEMU_CAPS_MACHINE_PSERIES_CAP_SBBC,
+                        QEMU_CAPS_MACHINE_PSERIES_CAP_IBS);
 
     /* parse error: no QEMU_CAPS_MACHINE_PSERIES_SBBC */
     DO_TEST_PARSE_ERROR("pseries-features",
@@ -2036,7 +2043,19 @@ mymain(void)
                         QEMU_CAPS_MACHINE_PSERIES_CAP_HTM,
                         QEMU_CAPS_MACHINE_PSERIES_CAP_NESTED_HV,
                         QEMU_CAPS_MACHINE_PSERIES_CAP_CCF_ASSIST,
-                        QEMU_CAPS_MACHINE_PSERIES_CAP_CFPC);
+                        QEMU_CAPS_MACHINE_PSERIES_CAP_CFPC,
+                        QEMU_CAPS_MACHINE_PSERIES_CAP_IBS);
+
+    /* parse error: no QEMU_CAPS_MACHINE_PSERIES_IBS */
+    DO_TEST_PARSE_ERROR("pseries-features",
+                        QEMU_CAPS_DEVICE_SPAPR_PCI_HOST_BRIDGE,
+                        QEMU_CAPS_MACHINE_PSERIES_RESIZE_HPT,
+                        QEMU_CAPS_MACHINE_PSERIES_CAP_HPT_MAX_PAGE_SIZE,
+                        QEMU_CAPS_MACHINE_PSERIES_CAP_HTM,
+                        QEMU_CAPS_MACHINE_PSERIES_CAP_NESTED_HV,
+                        QEMU_CAPS_MACHINE_PSERIES_CAP_CCF_ASSIST,
+                        QEMU_CAPS_MACHINE_PSERIES_CAP_CFPC,
+                        QEMU_CAPS_MACHINE_PSERIES_CAP_SBBC);
 
     DO_TEST_PARSE_ERROR("pseries-features-invalid-machine", NONE);
 

tests/qemuxml2xmloutdata/pseries-features.xml

@@ -17,6 +17,7 @@
     <ccf-assist state='on'/>
     <cfpc value='fixed'/>
     <sbbc value='broken'/>
+    <ibs value='fixed-ccd'/>
   </features>
   <clock offset='utc'/>
   <on_poweroff>destroy</on_poweroff>

tests/qemuxml2xmltest.c

@@ -697,7 +697,8 @@ mymain(void)
             QEMU_CAPS_MACHINE_PSERIES_CAP_CCF_ASSIST,
             QEMU_CAPS_MACHINE_PSERIES_RESIZE_HPT,
             QEMU_CAPS_MACHINE_PSERIES_CAP_CFPC,
-            QEMU_CAPS_MACHINE_PSERIES_CAP_SBBC);
+            QEMU_CAPS_MACHINE_PSERIES_CAP_SBBC,
+            QEMU_CAPS_MACHINE_PSERIES_CAP_IBS);
 
     DO_TEST("pseries-serial-native",
             QEMU_CAPS_DEVICE_SPAPR_PCI_HOST_BRIDGE,