From: Jiri Denemark <jdenemar@redhat.com>
Date: Mon, 23 Jun 2025 13:46:37 +0000 (+0200)
Subject: qemu: Implement VIR_CONNECT_BASELINE_CPU_IGNORE_HOST
X-Git-Tag: v11.6.0-rc1~88
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f9f2003762fa9dbdea5ca57f3ced315244ca0177;p=thirdparty%2Flibvirt.git

qemu: Implement VIR_CONNECT_BASELINE_CPU_IGNORE_HOST

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
---

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 6982a7a828..7c203e32fe 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -11964,13 +11964,20 @@ qemuConnectBaselineHypervisorCPU(virConnectPtr conn,
     size_t i;
 
     virCheckFlags(VIR_CONNECT_BASELINE_CPU_EXPAND_FEATURES |
-                  VIR_CONNECT_BASELINE_CPU_MIGRATABLE, NULL);
+                  VIR_CONNECT_BASELINE_CPU_MIGRATABLE |
+                  VIR_CONNECT_BASELINE_CPU_IGNORE_HOST, NULL);
 
     if (virConnectBaselineHypervisorCPUEnsureACL(conn) < 0)
         goto cleanup;
 
     migratable = !!(flags & VIR_CONNECT_BASELINE_CPU_MIGRATABLE);
 
+    if ((flags & VIR_CONNECT_BASELINE_CPU_IGNORE_HOST) && ncpus < 2) {
+        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+                       _("ignoring host is only allowed when computing baseline from multiple CPUs"));
+        goto cleanup;
+    }
+
     if (!(cpus = virCPUDefListParse(xmlCPUs, ncpus, VIR_CPU_TYPE_AUTO)))
         goto cleanup;
 
@@ -11993,14 +12000,19 @@ qemuConnectBaselineHypervisorCPU(virConnectPtr conn,
     }
 
     if (ARCH_IS_X86(arch)) {
-        int rc = virQEMUCapsGetCPUFeatures(qemuCaps, virttype,
-                                           migratable, &features);
-        if (rc < 0)
-            goto cleanup;
-        if (features && rc == 0) {
-            /* We got only migratable features from QEMU if we asked for them,
-             * no further filtering in virCPUBaseline is desired. */
-            migratable = false;
+        if (flags & VIR_CONNECT_BASELINE_CPU_IGNORE_HOST) {
+            VIR_DEBUG("Not adding host's features as VIR_CONNECT_BASELINE_CPU_IGNORE_HOST was set");
+            g_clear_pointer(&cpuModels, virObjectUnref);
+        } else {
+            int rc = virQEMUCapsGetCPUFeatures(qemuCaps, virttype,
+                                               migratable, &features);
+            if (rc < 0)
+                goto cleanup;
+            if (features && rc == 0) {
+                /* We got only migratable features from QEMU if we asked for them,
+                 * no further filtering in virCPUBaseline is desired. */
+                migratable = false;
+            }
         }
 
         if (!(cpu = virCPUBaseline(arch, cpus, ncpus, cpuModels,