qemu: domain: Add support for modifying qemu capability list via qemu namespace

For testing purposes it's sometimes desired to be able to control the
presence of capabilities of qemu. This adds the possibility to do this
via the qemu namespace.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/qemu/qemu_domain.c

@@ -8320,6 +8320,7 @@ void qemuDomainObjCheckTaint(virQEMUDriverPtr driver,
     size_t i;
     virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
     qemuDomainObjPrivatePtr priv = obj->privateData;
+    bool custom_hypervisor_feat = false;
 
     if (virQEMUDriverIsPrivileged(driver) &&
         (!cfg->clearEmulatorCapabilities ||
@@ -8334,6 +8335,13 @@ void qemuDomainObjCheckTaint(virQEMUDriverPtr driver,
         qemuDomainXmlNsDefPtr qemuxmlns = obj->def->namespaceData;
         if (qemuxmlns->num_args || qemuxmlns->num_env)
             qemuDomainObjTaint(driver, obj, VIR_DOMAIN_TAINT_CUSTOM_ARGV, logCtxt);
+        if (qemuxmlns->ncapsadd > 0 || qemuxmlns->ncapsdel > 0)
+            custom_hypervisor_feat = true;
+    }
+
+    if (custom_hypervisor_feat) {
+        qemuDomainObjTaint(driver, obj,
+                           VIR_DOMAIN_TAINT_CUSTOM_HYPERVISOR_FEATURE, logCtxt);
     }
 
     if (obj->def->cpu && obj->def->cpu->mode == VIR_CPU_MODE_HOST_PASSTHROUGH)

src/qemu/qemu_process.c

@@ -5448,6 +5448,42 @@ qemuProcessStartValidate(virQEMUDriverPtr driver,
 }
 
 
+static int
+qemuProcessStartUpdateCustomCaps(virDomainObjPtr vm)
+{
+    qemuDomainObjPrivatePtr priv = vm->privateData;
+    qemuDomainXmlNsDefPtr nsdef = vm->def->namespaceData;
+    int tmp;
+    size_t i;
+
+    if (nsdef) {
+        for (i = 0; i < nsdef->ncapsadd; i++) {
+            if ((tmp = virQEMUCapsTypeFromString(nsdef->capsadd[i])) < 0) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("invalid qemu namespace capability '%s'"),
+                               nsdef->capsadd[i]);
+                return -1;
+            }
+
+            virQEMUCapsSet(priv->qemuCaps, tmp);
+        }
+
+        for (i = 0; i < nsdef->ncapsdel; i++) {
+            if ((tmp = virQEMUCapsTypeFromString(nsdef->capsdel[i])) < 0) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("invalid qemu namespace capability '%s'"),
+                               nsdef->capsdel[i]);
+                return -1;
+            }
+
+            virQEMUCapsClear(priv->qemuCaps, tmp);
+        }
+    }
+
+    return 0;
+}
+
+
 /**
  * qemuProcessInit:
  *
@@ -5518,6 +5554,10 @@ qemuProcessInit(virQEMUDriverPtr driver,
     if (virDomainObjSetDefTransient(caps, driver->xmlopt, vm) < 0)
         goto cleanup;
 
+    /* Update qemu capabilities according to lists passed in via namespace */
+    if (qemuProcessStartUpdateCustomCaps(vm) < 0)
+        goto cleanup;
+
     if (flags & VIR_QEMU_PROCESS_START_PRETEND) {
         if (qemuDomainSetPrivatePaths(driver, vm) < 0) {
             virDomainObjRemoveTransientDef(vm);