[PATCH 3/8] qemuBuildMemoryBackendProps: Prealloc mem for memfd backend

[Michal Privoznik <mprivozn@xxxxxxxxxx>]

If a domain was using hugepages through memory-backend-file or
via -mem-path, we would turn prealloc on. But we are not doing
that for memory-backend-memfd. Fix this, because we need QEMU to
fully allocate hugepages.

Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
---
 src/qemu/qemu_command.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index e1c4be03e5..5b845ef903 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -3114,10 +3114,13 @@ qemuBuildMemoryBackendProps(virJSONValuePtr *backendProps,
     if (def->mem.source == VIR_DOMAIN_MEMORY_SOURCE_MEMFD) {
         backendType = "memory-backend-memfd";
 
-        if (useHugepage &&
-            (virJSONValueObjectAdd(props, "b:hugetlb", useHugepage, NULL) < 0 ||
-             virJSONValueObjectAdd(props, "U:hugetlbsize", pagesize << 10, NULL) < 0)) {
-            return -1;
+        if (useHugepage) {
+            if (virJSONValueObjectAdd(props, "b:hugetlb", useHugepage, NULL) < 0 ||
+                virJSONValueObjectAdd(props, "U:hugetlbsize", pagesize << 10, NULL) < 0) {
+                return -1;
+            }
+
+            prealloc = true;
         }
 
         if (qemuBuildMemoryBackendPropsShare(props, memAccess) < 0)
-- 
2.26.2