From 8744beecb36600e773c8a8c4823db2bf4b3e262d Mon Sep 17 00:00:00 2001
From: Jiri Denemark <jdenemar@redhat.com>
Date: Wed, 22 Jun 2022 16:35:50 +0200
Subject: [PATCH] Add VIR_MIGRATE_ZEROCOPY flag
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The flag can be used to enable zero-copy mechanism for migrating memory
pages.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
---
 include/libvirt/libvirt-domain.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index 1ea3284e63..05344aaa95 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -1089,6 +1089,15 @@ typedef enum {
      * Since: 8.5.0
      */
     VIR_MIGRATE_POSTCOPY_RESUME = (1 << 19),
+
+    /* Use zero-copy mechanism for migrating memory pages. For QEMU/KVM this
+     * means QEMU will be temporarily allowed to lock all guest pages in host's
+     * memory, although only those that are queued for transfer will be locked
+     * at the same time.
+     *
+     * Since: 8.5.0
+     */
+    VIR_MIGRATE_ZEROCOPY = (1 << 20),
 } virDomainMigrateFlags;