From: Daniel Henrique Barboza <danielhb413@gmail.com>
Date: Mon, 27 Apr 2020 12:14:29 +0000 (-0300)
Subject: qemu: Implement the SBBC pSeries feature
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=104dadcff6023da676df3905d1ed8688aea15e86;p=libvirt.git

qemu: Implement the SBBC pSeries feature

This patch adds the implementation of the SBBC pSeries feature,
using the QEMU_CAPS_MACHINE_PSERIES_CAP_SBBC capability added
in the previous patch.

Like the previously added CFPC feature, SBBC can have the values
"broken", "workaround" or "fixed". Extra code is required to handle
it since it's not a regular tristate capability.

This is the XML format for the cap:

<features>
  <sbbc value='workaround'/>
</features>

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
---

diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index a99407675f..dd8172fff2 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -2079,6 +2079,7 @@
   &lt;ccf-assist state='on'/&gt;
   &lt;msrs unknown='ignore'/&gt;
   &lt;cfpc value='workaround'/&gt;
+  &lt;sbbc value='workaround'/&gt;
 &lt;/features&gt;
 ...</pre>
 
@@ -2417,6 +2418,16 @@
           default will be used.
           <span class="since">Since 6.3.0</span> (QEMU/KVM only)
       </dd>
+      <dt><code>sbbc</code></dt>
+      <dd>Configure sbbc (Speculation Barrier Bounds Checking) availability for
+          pSeries guests.
+          Possible values for the <code>value</code> attribute
+          are <code>broken</code> (no protection), <code>workaround</code>
+          (software workaround available) and <code>fixed</code> (fixed in
+          hardware). 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>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 6441e01717..2a7a433c03 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -5437,6 +5437,9 @@
           <optional>
             <ref name="cfpc"/>
           </optional>
+          <optional>
+            <ref name="sbbc"/>
+          </optional>
         </interleave>
       </element>
     </optional>
@@ -5708,6 +5711,18 @@
     </element>
   </define>
 
+  <define name="sbbc">
+    <element name="sbbc">
+      <attribute name="value">
+        <choice>
+          <value>broken</value>
+          <value>workaround</value>
+          <value>fixed</value>
+        </choice>
+      </attribute>
+    </element>
+  </define>
+
   <define name="address">
     <element name="address">
       <choice>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index e53586cdf2..226a0012fc 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -175,6 +175,7 @@ VIR_ENUM_IMPL(virDomainFeature,
               "ccf-assist",
               "xen",
               "cfpc",
+              "sbbc",
 );
 
 VIR_ENUM_IMPL(virDomainCapabilitiesPolicy,
@@ -1275,6 +1276,14 @@ VIR_ENUM_IMPL(virDomainCFPC,
               "fixed",
 );
 
+VIR_ENUM_IMPL(virDomainSBBC,
+              VIR_DOMAIN_SBBC_LAST,
+              "none",
+              "broken",
+              "workaround",
+              "fixed",
+);
+
 /* Internal mapping: subset of block job types that can be present in
  * <mirror> XML (remaining types are not two-phase). */
 VIR_ENUM_DECL(virDomainBlockJob);
@@ -19350,6 +19359,21 @@ virDomainFeaturesDefParse(virDomainDefPtr def,
             }
             break;
 
+        case VIR_DOMAIN_FEATURE_SBBC:
+            tmp = virXMLPropString(nodes[i], "value");
+            if (tmp) {
+                int value = virDomainSBBCTypeFromString(tmp);
+                if (value < 0 || value == VIR_DOMAIN_SBBC_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:
@@ -23413,6 +23437,18 @@ virDomainDefFeaturesCheckABIStability(virDomainDefPtr src,
             }
             break;
 
+        case VIR_DOMAIN_FEATURE_SBBC:
+            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", virDomainSBBCTypeToString(src->features[i]),
+                               "value", virDomainSBBCTypeToString(dst->features[i]));
+                return false;
+            }
+            break;
+
         case VIR_DOMAIN_FEATURE_MSRS:
             break;
 
@@ -29255,6 +29291,14 @@ virDomainDefFormatFeatures(virBufferPtr buf,
                               virDomainCFPCTypeToString(def->features[i]));
             break;
 
+        case VIR_DOMAIN_FEATURE_SBBC:
+            if (def->features[i] == VIR_DOMAIN_SBBC_NONE)
+                break;
+
+            virBufferAsprintf(&childBuf, "<sbbc value='%s'/>\n",
+                              virDomainSBBCTypeToString(def->features[i]));
+            break;
+
         /* coverity[dead_error_begin] */
         case VIR_DOMAIN_FEATURE_LAST:
             break;
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 8594049e52..ac84591b17 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -1817,6 +1817,7 @@ typedef enum {
     VIR_DOMAIN_FEATURE_CCF_ASSIST,
     VIR_DOMAIN_FEATURE_XEN,
     VIR_DOMAIN_FEATURE_CFPC,
+    VIR_DOMAIN_FEATURE_SBBC,
 
     VIR_DOMAIN_FEATURE_LAST
 } virDomainFeature;
@@ -1999,6 +2000,17 @@ typedef enum {
 
 VIR_ENUM_DECL(virDomainCFPC);
 
+typedef enum {
+    VIR_DOMAIN_SBBC_NONE = 0,
+    VIR_DOMAIN_SBBC_BROKEN,
+    VIR_DOMAIN_SBBC_WORKAROUND,
+    VIR_DOMAIN_SBBC_FIXED,
+
+    VIR_DOMAIN_SBBC_LAST
+} virDomainSBBC;
+
+VIR_ENUM_DECL(virDomainSBBC);
+
 /* Operating system configuration data & machine / arch */
 struct _virDomainOSEnv {
     char *name;
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 9c09f9ac63..6a4cc16ce6 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -583,6 +583,8 @@ virDomainRNGModelTypeToString;
 virDomainRNGRemove;
 virDomainRunningReasonTypeFromString;
 virDomainRunningReasonTypeToString;
+virDomainSBBCTypeFromString;
+virDomainSBBCTypeToString;
 virDomainSCSIDriveAddressIsUsed;
 virDomainSeclabelTypeFromString;
 virDomainSeclabelTypeToString;
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 4cb454769a..b7c6be0d50 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -7176,6 +7176,11 @@ qemuBuildMachineCommandLine(virCommandPtr cmd,
         virBufferAsprintf(&buf, ",cap-cfpc=%s", str);
     }
 
+    if (def->features[VIR_DOMAIN_FEATURE_SBBC] != VIR_DOMAIN_SBBC_NONE) {
+        const char *str = virDomainSBBCTypeToString(def->features[VIR_DOMAIN_FEATURE_SBBC]);
+        virBufferAsprintf(&buf, ",cap-sbbc=%s", str);
+    }
+
     if (cpu && cpu->model &&
         cpu->mode == VIR_CPU_MODE_HOST_MODEL &&
         qemuDomainIsPSeries(def) &&
diff --git a/src/qemu/qemu_validate.c b/src/qemu/qemu_validate.c
index 31d36e938b..0d5df6f426 100644
--- a/src/qemu/qemu_validate.c
+++ b/src/qemu/qemu_validate.c
@@ -146,6 +146,16 @@ qemuValidateDomainDefPSeriesFeature(const virDomainDef *def,
             return -1;
         }
 
+        break;
+
+    case VIR_DOMAIN_FEATURE_SBBC:
+        if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_MACHINE_PSERIES_CAP_SBBC)) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("sbbc configuration is not supported by "
+                             "this QEMU binary"));
+            return -1;
+        }
+
         break;
     }
 
@@ -205,6 +215,7 @@ qemuValidateDomainDefFeatures(const virDomainDef *def,
         case VIR_DOMAIN_FEATURE_NESTED_HV:
         case VIR_DOMAIN_FEATURE_CCF_ASSIST:
         case VIR_DOMAIN_FEATURE_CFPC:
+        case VIR_DOMAIN_FEATURE_SBBC:
             if (qemuValidateDomainDefPSeriesFeature(def, qemuCaps, i) < 0)
                 return -1;
             break;
diff --git a/tests/qemuxml2argvdata/pseries-features.args b/tests/qemuxml2argvdata/pseries-features.args
index 8540252c17..9a64df7593 100644
--- a/tests/qemuxml2argvdata/pseries-features.args
+++ b/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-cfpc=fixed,cap-sbbc=broken \
 -m 512 \
 -realtime mlock=off \
 -smp 1,sockets=1,cores=1,threads=1 \
diff --git a/tests/qemuxml2argvdata/pseries-features.xml b/tests/qemuxml2argvdata/pseries-features.xml
index f07a204cb7..ef431b0067 100644
--- a/tests/qemuxml2argvdata/pseries-features.xml
+++ b/tests/qemuxml2argvdata/pseries-features.xml
@@ -14,6 +14,7 @@
     <nested-hv state='off'/>
     <ccf-assist state='on'/>
     <cfpc value='fixed'/>
+    <sbbc value='broken'/>
   </features>
   <devices>
     <emulator>/usr/bin/qemu-system-ppc64</emulator>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 1bad60bfce..83f451f750 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -1965,6 +1965,7 @@ 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_RESIZE_HPT);
 
     /* parse error: no QEMU_CAPS_MACHINE_PSERIES_RESIZE_HPT */
@@ -1974,7 +1975,8 @@ 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_CFPC);
+                        QEMU_CAPS_MACHINE_PSERIES_CAP_CFPC,
+                        QEMU_CAPS_MACHINE_PSERIES_CAP_SBBC);
 
     /* parse error: no QEMU_CAPS_MACHINE_PSERIES_CAP_HPT_MAX_PAGE_SIZE */
     DO_TEST_PARSE_ERROR("pseries-features",
@@ -1983,6 +1985,7 @@ 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_RESIZE_HPT);
 
     /* parse error: no QEMU_CAPS_MACHINE_PSERIES_CAP_HTM */
@@ -1992,6 +1995,7 @@ 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_RESIZE_HPT);
 
     /* parse error: no QEMU_CAPS_MACHINE_PSERIES_CAP_NESTED_HV */
@@ -2001,6 +2005,7 @@ mymain(void)
                         QEMU_CAPS_MACHINE_PSERIES_CAP_HTM,
                         QEMU_CAPS_MACHINE_PSERIES_CAP_CCF_ASSIST,
                         QEMU_CAPS_MACHINE_PSERIES_CAP_CFPC,
+                        QEMU_CAPS_MACHINE_PSERIES_CAP_SBBC,
                         QEMU_CAPS_MACHINE_PSERIES_RESIZE_HPT);
 
     /* parse error: no QEMU_CAPS_MACHINE_PSERIES_CAP_CCF_ASSIST */
@@ -2010,6 +2015,7 @@ mymain(void)
                         QEMU_CAPS_MACHINE_PSERIES_CAP_HTM,
                         QEMU_CAPS_MACHINE_PSERIES_CAP_NESTED_HV,
                         QEMU_CAPS_MACHINE_PSERIES_CAP_CFPC,
+                        QEMU_CAPS_MACHINE_PSERIES_CAP_SBBC,
                         QEMU_CAPS_MACHINE_PSERIES_RESIZE_HPT);
 
     /* parse error: no QEMU_CAPS_MACHINE_PSERIES_CFPC */
@@ -2019,7 +2025,18 @@ mymain(void)
                         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_CCF_ASSIST,
+                        QEMU_CAPS_MACHINE_PSERIES_CAP_SBBC);
+
+    /* parse error: no QEMU_CAPS_MACHINE_PSERIES_SBBC */
+    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);
 
     DO_TEST_PARSE_ERROR("pseries-features-invalid-machine", NONE);
 
diff --git a/tests/qemuxml2xmloutdata/pseries-features.xml b/tests/qemuxml2xmloutdata/pseries-features.xml
index 1b5d78ce74..3700ffa195 100644
--- a/tests/qemuxml2xmloutdata/pseries-features.xml
+++ b/tests/qemuxml2xmloutdata/pseries-features.xml
@@ -16,6 +16,7 @@
     <nested-hv state='off'/>
     <ccf-assist state='on'/>
     <cfpc value='fixed'/>
+    <sbbc value='broken'/>
   </features>
   <clock offset='utc'/>
   <on_poweroff>destroy</on_poweroff>
diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
index 2a89c289a4..c2596161c3 100644
--- a/tests/qemuxml2xmltest.c
+++ b/tests/qemuxml2xmltest.c
@@ -696,7 +696,8 @@ mymain(void)
             QEMU_CAPS_MACHINE_PSERIES_CAP_NESTED_HV,
             QEMU_CAPS_MACHINE_PSERIES_CAP_CCF_ASSIST,
             QEMU_CAPS_MACHINE_PSERIES_RESIZE_HPT,
-            QEMU_CAPS_MACHINE_PSERIES_CAP_CFPC);
+            QEMU_CAPS_MACHINE_PSERIES_CAP_CFPC,
+            QEMU_CAPS_MACHINE_PSERIES_CAP_SBBC);
 
     DO_TEST("pseries-serial-native",
             QEMU_CAPS_DEVICE_SPAPR_PCI_HOST_BRIDGE,