From: Jiri Denemark <jdenemar@redhat.com>
Date: Wed, 22 Jun 2022 14:35:50 +0000 (+0200)
Subject: Add VIR_MIGRATE_ZEROCOPY flag
X-Git-Tag: v8.5.0-rc1~6
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8744beecb36600e773c8a8c4823db2bf4b3e262d;p=thirdparty%2Flibvirt.git

Add VIR_MIGRATE_ZEROCOPY flag

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>
---

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;