File 75a4e016-qemu-validate-prealloc-threads.patch of Package libvirt.25654

commit 75a4e0165ef199809974e97b507d3953e1de01d1
Author: Michal Prívozník <mprivozn@redhat.com>
Date:   Mon Mar 21 17:09:40 2022 +0100

    qemu_validate: Validate prealloc threads against qemuCpas
    
    Only fairly new QEMUs are capable of user provided number of
    preallocation threads. Validate this assumption.
    
    Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
    Reviewed-by: Martin Kletzander <mkletzan@redhat.com>

Index: libvirt-7.1.0/src/qemu/qemu_validate.c
===================================================================
--- libvirt-7.1.0.orig/src/qemu/qemu_validate.c
+++ libvirt-7.1.0/src/qemu/qemu_validate.c
@@ -771,6 +771,13 @@ qemuValidateDomainDefMemory(const virDom
         return -1;
     }
 
+    if (mem->allocation_threads > 0 &&
+        !virQEMUCapsGet(qemuCaps, QEMU_CAPS_MEMORY_BACKEND_PREALLOC_THREADS)) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                       _("preallocation threads are unsupported with this QEMU"));
+        return -1;
+    }
+
     if (mem->source == VIR_DOMAIN_MEMORY_SOURCE_ANONYMOUS) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
                        _("hugepages are not allowed with anonymous "