[PATCH v2 3/3] qemuBuildNumaArgStr: Use modern -numa memdev= if old -numa mem= is unsupported

[Michal Privoznik <mprivozn@xxxxxxxxxx>]

In previous commit we started tracking whether QEMU supports
'-numa mem='. This is tied to the machine type because migration
from '-numa mem=' to '-numa memdev' is impossible (or vice
versa). But since it's tied to a machine type (where migration
from one to another is also unsupported) we can allow QEMU to get
rid of the deprecated command line.

Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
---
 src/qemu/qemu_command.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index cf6c48d233..19c45cb4e3 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -7038,6 +7038,11 @@ qemuBuildNumaArgStr(virQEMUDriverConfigPtr cfg,
     if (!virDomainNumatuneNodesetIsAvailable(def->numa, priv->autoNodeset))
         goto cleanup;
 
+    if (!virQEMUCapsGetMachineNumaMemSupported(qemuCaps,
+                                               def->virtType,
+                                               def->os.machine))
+        needBackend = true;
+
     if (VIR_ALLOC_N(nodeBackends, ncells) < 0)
         goto cleanup;
 
@@ -7055,6 +7060,10 @@ qemuBuildNumaArgStr(virQEMUDriverConfigPtr cfg,
             if (rc == 0)
                 needBackend = true;
         }
+    } else if (needBackend) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                       _("numa not supported"));
+        goto cleanup;
     }
 
     if (!needBackend &&
-- 
2.26.2