qemu: Add support for S3/S4 state configuration

This patch adds support for running qemu guests with the required
parameters to forcefully enable or disable BIOS advertising of S3 and
S4 states.  The support for this is added to capabilities and there is
also a qemu command parameter parsing implemented.

src/qemu/qemu_capabilities.c

@@ -173,7 +173,9 @@ VIR_ENUM_IMPL(qemuCaps, QEMU_CAPS_LAST,
               "lsi",
               "virtio-scsi-pci",
               "iolimits",
+              "disable-s3",
 
+              "disable-s4", /* 105 */
     );
 
 struct qemu_feature_flags {
@@ -1404,6 +1406,7 @@ qemuCapsExtractDeviceStr(const char *qemu,
                          "-device", "virtio-blk-pci,?",
                          "-device", "virtio-net-pci,?",
                          "-device", "scsi-disk,?",
+                         "-device", "PIIX4_PM,?",
                          NULL);
     /* qemu -help goes to stdout, but qemu -device ? goes to stderr.  */
     virCommandSetErrorBuffer(cmd, &output);
@@ -1510,6 +1513,10 @@ qemuCapsParseDeviceStr(const char *str, virBitmapPtr flags)
     if (strstr(str, ".logical_block_size") &&
         strstr(str, ".physical_block_size"))
         qemuCapsSet(flags, QEMU_CAPS_IOLIMITS);
+    if (strstr(str, "PIIX4_PM.disable_s3="))
+        qemuCapsSet(flags, QEMU_CAPS_DISABLE_S3);
+    if (strstr(str, "PIIX4_PM.disable_s4="))
+        qemuCapsSet(flags, QEMU_CAPS_DISABLE_S4);
 
     return 0;
 }

src/qemu/qemu_capabilities.h

@@ -139,6 +139,8 @@ enum qemuCapsFlags {
     QEMU_CAPS_SCSI_LSI           = 101, /* -device lsi */
     QEMU_CAPS_VIRTIO_SCSI_PCI    = 102, /* -device virtio-scsi-pci */
     QEMU_CAPS_IOLIMITS           = 103, /* -device ...logical_block_size & co */
+    QEMU_CAPS_DISABLE_S3         = 104, /* S3 BIOS Advertisement on/off */
+    QEMU_CAPS_DISABLE_S4         = 105, /* S4 BIOS Advertisement on/off */
 
     QEMU_CAPS_LAST,                   /* this must always be the last item */
 };

src/qemu/qemu_command.c

@@ -4790,6 +4790,28 @@ qemuBuildCommandLine(virConnectPtr conn,
             virCommandAddArg(cmd, "-no-acpi");
     }
 
+    if (def->pm.s3) {
+        if (!qemuCapsGet(qemuCaps, QEMU_CAPS_DISABLE_S3)) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                           "%s", _("setting ACPI S3 not supported"));
+            goto error;
+        }
+        virCommandAddArg(cmd, "-global");
+        virCommandAddArgFormat(cmd, "PIIX4_PM.disable_s3=%d",
+                               def->pm.s3 == VIR_DOMAIN_PM_STATE_DISABLED);
+    }
+
+    if (def->pm.s4) {
+        if (!qemuCapsGet(qemuCaps, QEMU_CAPS_DISABLE_S4)) {
+         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                           "%s", _("setting ACPI S4 not supported"));
+            goto error;
+        }
+        virCommandAddArg(cmd, "-global");
+        virCommandAddArgFormat(cmd, "PIIX4_PM.disable_s4=%d",
+                               def->pm.s4 == VIR_DOMAIN_PM_STATE_DISABLED);
+    }
+
     if (!def->os.bootloader) {
         /*
          * We prefer using explicit bootindex=N parameters for predictable
@@ -8376,6 +8398,42 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr caps,
 
                 *monConfig = chr;
             }
+        } else if (STREQ(arg, "-global") &&
+                   STRPREFIX(progargv[i + 1], "PIIX4_PM.disable_s3=")) {
+            /* We want to parse only the known "-global" parameters,
+             * so the ones that we don't know are still added to the
+             * namespace */
+            WANT_VALUE();
+
+            val += strlen("PIIX4_PM.disable_s3=");
+            if (STREQ(val, "0"))
+                def->pm.s3 = VIR_DOMAIN_PM_STATE_ENABLED;
+            else if (STREQ(val, "1"))
+                def->pm.s3 = VIR_DOMAIN_PM_STATE_DISABLED;
+            else {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                               _("invalid value for disable_s3 parameter: "
+                                 "'%s'"), val);
+                goto error;
+            }
+
+        } else if (STREQ(arg, "-global") &&
+                   STRPREFIX(progargv[i + 1], "PIIX4_PM.disable_s4=")) {
+
+            WANT_VALUE();
+
+            val += strlen("PIIX4_PM.disable_s4=");
+            if (STREQ(val, "0"))
+                def->pm.s4 = VIR_DOMAIN_PM_STATE_ENABLED;
+            else if (STREQ(val, "1"))
+                def->pm.s4 = VIR_DOMAIN_PM_STATE_DISABLED;
+            else {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                               _("invalid value for disable_s4 parameter: "
+                                 "'%s'"), val);
+                goto error;
+            }
+
         } else if (STREQ(arg, "-S")) {
             /* ignore, always added by libvirt */
         } else {

src/qemu/qemu_driver.c

@@ -13722,6 +13722,23 @@ qemuDomainPMSuspendForDuration(virDomainPtr dom,
         goto cleanup;
     }
 
+    if (vm->def->pm.s3 || vm->def->pm.s4) {
+        if (vm->def->pm.s3 == VIR_DOMAIN_PM_STATE_DISABLED &&
+            (target == VIR_NODE_SUSPEND_TARGET_MEM ||
+             target == VIR_NODE_SUSPEND_TARGET_HYBRID)) {
+            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                           _("S3 state is disabled for this domain"));
+            goto cleanup;
+        }
+
+        if (vm->def->pm.s4 == VIR_DOMAIN_PM_STATE_DISABLED &&
+            target == VIR_NODE_SUSPEND_TARGET_DISK) {
+            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                           _("S4 state is disabled for this domain"));
+            goto cleanup;
+        }
+    }
+
     if (priv->agentError) {
         virReportError(VIR_ERR_AGENT_UNRESPONSIVE, "%s",
                        _("QEMU guest agent is not "