The QEMU_CAPS_DEVICE_VIRTIO_MEM_PCI_DYNAMIC_MEMSLOTS reflects
whether QEMU is capable of .dynamic-memslots for virtio-mem.
Use it when validating domain configuration.

Signed-off-by: Michal Privoznik <mpriv...@redhat.com>
---
 src/qemu/qemu_validate.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/qemu/qemu_validate.c b/src/qemu/qemu_validate.c
index 9e50c2f45b..3b0dfec2b4 100644
--- a/src/qemu/qemu_validate.c
+++ b/src/qemu/qemu_validate.c
@@ -4971,6 +4971,13 @@ qemuValidateDomainDeviceDefMemory(virDomainMemoryDef 
*mem,
                            _("virtio-mem isn't supported by this QEMU 
binary"));
             return -1;
         }
+
+        if (mem->target.virtio_mem.dynamicMemslots == VIR_TRISTATE_BOOL_YES &&
+            !virQEMUCapsGet(qemuCaps, 
QEMU_CAPS_DEVICE_VIRTIO_MEM_PCI_DYNAMIC_MEMSLOTS)) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("virtio-mem does not support dynamicMemslots"));
+            return -1;
+        }
         break;
 
     case VIR_DOMAIN_MEMORY_MODEL_SGX_EPC:
-- 
2.41.0
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