From 2f3e89c97c7babc1d4da579eadf34979c8fc1725 Mon Sep 17 00:00:00 2001 Message-Id: <2f3e89c97c7babc1d4da579eadf34979c8fc1725@dist-git> From: Jiri Denemark Date: Wed, 22 Jun 2022 16:35:50 +0200 Subject: [PATCH] Add VIR_MIGRATE_ZEROCOPY flag MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The flag can be used to enable zero-copy mechanism for migrating memory pages. Signed-off-by: Jiri Denemark Reviewed-by: Ján Tomko (cherry picked from commit 8744beecb36600e773c8a8c4823db2bf4b3e262d) https://bugzilla.redhat.com/show_bug.cgi?id=2117272 Conflicts: include/libvirt/libvirt-domain.h - post-copy recovery not backported Signed-off-by: Jiri Denemark --- include/libvirt/libvirt-domain.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h index 5f0a9b7572..792973ce2d 100644 --- a/include/libvirt/libvirt-domain.h +++ b/include/libvirt/libvirt-domain.h @@ -860,6 +860,14 @@ typedef enum { */ VIR_MIGRATE_NON_SHARED_SYNCHRONOUS_WRITES = (1 << 18), + /* 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; -- 2.35.1