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 "

​