bhyve: implement domainShutdown

Bhyve supports ACPI shutdown by issuing SIGTERM signal to a bhyve
process.

Add the bhyveDomainShutdown() function and virBhyveProcessShutdown()
helper function that just sends SIGTERM to VM's bhyve process. If
a guest supports ACPI shutdown then process will be terminated and
this event will be noticed by the bhyve monitor code that will handle
setting proper status and clean up VM's resources by calling
virBhyveProcessStop().

src/bhyve/bhyve_driver.c

@@ -1017,6 +1017,32 @@ bhyveDomainDestroy(virDomainPtr dom)
     return ret;
 }
 
+static int
+bhyveDomainShutdown(virDomainPtr dom)
+{
+    virDomainObjPtr vm;
+    int ret = -1;
+
+    if (!(vm = bhyveDomObjFromDomain(dom)))
+        goto cleanup;
+
+    if (virDomainShutdownEnsureACL(dom->conn, vm->def) < 0)
+        goto cleanup;
+
+    if (!virDomainObjIsActive(vm)) {
+        virReportError(VIR_ERR_OPERATION_INVALID,
+                       "%s", _("Domain is not running"));
+        goto cleanup;
+    }
+
+    ret = virBhyveProcessShutdown(vm);
+
+ cleanup:
+    if (vm)
+        virObjectUnlock(vm);
+    return ret;
+}
+
 static int
 bhyveDomainOpenConsole(virDomainPtr dom,
                        const char *dev_name ATTRIBUTE_UNUSED,
@@ -1502,6 +1528,7 @@ static virHypervisorDriver bhyveHypervisorDriver = {
     .domainCreateWithFlags = bhyveDomainCreateWithFlags, /* 1.2.3 */
     .domainCreateXML = bhyveDomainCreateXML, /* 1.2.4 */
     .domainDestroy = bhyveDomainDestroy, /* 1.2.2 */
+    .domainShutdown = bhyveDomainShutdown, /* 1.3.3 */
     .domainLookupByUUID = bhyveDomainLookupByUUID, /* 1.2.2 */
     .domainLookupByName = bhyveDomainLookupByName, /* 1.2.2 */
     .domainLookupByID = bhyveDomainLookupByID, /* 1.2.3 */

src/bhyve/bhyve_process.c

@@ -308,6 +308,29 @@ virBhyveProcessStop(bhyveConnPtr driver,
     return ret;
 }
 
+int
+virBhyveProcessShutdown(virDomainObjPtr vm)
+{
+    if (vm->pid <= 0) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("Invalid PID %d for VM"),
+                       (int)vm->pid);
+        return -1;
+    }
+
+    /* Bhyve tries to perform ACPI shutdown when it receives
+     * SIGTERM signal. So we just issue SIGTERM here and rely
+     * on the bhyve monitor to clean things up if process disappears.
+     */
+    if (virProcessKill(vm->pid, SIGTERM) != 0) {
+        VIR_WARN("Failed to terminate bhyve process for VM '%s': %s",
+                 vm->def->name, virGetLastErrorMessage());
+        return -1;
+    }
+
+    return 0;
+}
+
 int
 virBhyveGetDomainTotalCpuStats(virDomainObjPtr vm,
                                unsigned long long *cpustats)

src/bhyve/bhyve_process.h

@@ -34,6 +34,8 @@ int virBhyveProcessStop(bhyveConnPtr driver,
                         virDomainObjPtr vm,
                         virDomainShutoffReason reason);
 
+int virBhyveProcessShutdown(virDomainObjPtr vm);
+
 int virBhyveGetDomainTotalCpuStats(virDomainObjPtr vm,
                                    unsigned long long *cpustats);