[PATCH v1 4/4] qemu_driver: Implement qemuConnectGetHypervisorCPUNames

[Collin Walling <walling@xxxxxxxxxxxxx>]

This function is hooked into the virsh hypervisor-cpu-models command.
The CPU models are read directly from the QEMU capabilities file,
which contains a list of all models queried from the hypervisor.

Signed-off-by: Collin Walling <walling@xxxxxxxxxxxxx>
Reviewed-by: Boris Fiuczynski <fiuczy@xxxxxxxxxxxxx>
---
 src/qemu/qemu_driver.c | 62 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 09ae893daf..e101da4d21 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -12400,6 +12400,67 @@ qemuConnectBaselineHypervisorCPU(virConnectPtr conn,
 }
 
 
+static char *
+qemuConnectGetHypervisorCPUModelNames(virConnectPtr conn,
+                                      const char *emulator,
+                                      const char *archStr,
+                                      const char *machine,
+                                      const char *virttypeStr,
+                                      unsigned int flags)
+{
+    virQEMUDriver *driver = conn->privateData;
+    g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
+    g_autoptr(virDomainCapsCPUModels) cpuModels = NULL;
+    g_autoptr(virQEMUCaps) qemuCaps = NULL;
+    char *modelsstr = g_strdup("");
+    virDomainVirtType virttype;
+    virArch arch;
+    size_t i;
+
+    virCheckFlags(0, NULL);
+
+    if (virConnectGetHypervisorCPUModelNamesEnsureACL(conn) < 0)
+          return NULL;
+
+    qemuCaps = virQEMUCapsCacheLookupDefault(driver->qemuCapsCache,
+                                             emulator,
+                                             archStr,
+                                             virttypeStr,
+                                             machine,
+                                             &arch, &virttype, NULL);
+    if (!qemuCaps)
+        return NULL;
+
+    if (!(cpuModels = virQEMUCapsGetCPUModels(qemuCaps, virttype, NULL, NULL)) ||
+        cpuModels->nmodels == 0) {
+        virReportError(VIR_ERR_OPERATION_UNSUPPORTED,
+                       _("QEMU '%s' does not support any CPU models for "
+                         "virttype '%s'"),
+                       virQEMUCapsGetBinary(qemuCaps),
+                       virDomainVirtTypeToString(virttype));
+        return NULL;
+    }
+
+    for (i = 0; i < cpuModels->nmodels; i++) {
+        const char *name = cpuModels->models[i].name;
+        char *oldstr = modelsstr;
+        /*
+         * These models are not architecture-specific, but rather
+         * generic QEMU models, so let's filter them out
+         */
+        if (STREQ(name, "host") ||
+            STREQ(name, "qemu") ||
+            STREQ(name, "max"))
+            continue;
+
+        modelsstr = g_strdup_printf("%s\n%s", name, modelsstr);
+        g_free(oldstr);
+    }
+
+    return modelsstr;
+}
+
+
 static int
 qemuDomainGetJobInfoMigrationStats(virDomainObj *vm,
                                    virDomainJobData *jobData)
@@ -20814,6 +20875,7 @@ static virHypervisorDriver qemuHypervisorDriver = {
     .domainSetLifecycleAction = qemuDomainSetLifecycleAction, /* 3.9.0 */
     .connectCompareHypervisorCPU = qemuConnectCompareHypervisorCPU, /* 4.4.0 */
     .connectBaselineHypervisorCPU = qemuConnectBaselineHypervisorCPU, /* 4.4.0 */
+    .connectGetHypervisorCPUModelNames = qemuConnectGetHypervisorCPUModelNames, /* 9.2.0 */
     .nodeGetSEVInfo = qemuNodeGetSEVInfo, /* 4.5.0 */
     .domainGetLaunchSecurityInfo = qemuDomainGetLaunchSecurityInfo, /* 4.5.0 */
     .domainCheckpointCreateXML = qemuDomainCheckpointCreateXML, /* 5.6.0 */
-- 
2.39.0