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From 9c2fd182a02d64004e30900c52e3fcdb550de0bd Mon Sep 17 00:00:00 2001
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Message-Id: <9c2fd182a02d64004e30900c52e3fcdb550de0bd@dist-git>
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From: Jiri Denemark <jdenemar@redhat.com>
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Date: Wed, 22 Jun 2022 16:35:50 +0200
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Subject: [PATCH] Add VIR_MIGRATE_ZEROCOPY flag
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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The flag can be used to enable zero-copy mechanism for migrating memory
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pages.
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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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(cherry picked from commit 8744beecb36600e773c8a8c4823db2bf4b3e262d)
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https://bugzilla.redhat.com/show_bug.cgi?id=2089433
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Conflicts:
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include/libvirt/libvirt-domain.h
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- post-copy recovery not backported
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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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---
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include/libvirt/libvirt-domain.h | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
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index 5f0a9b7572..792973ce2d 100644
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--- a/include/libvirt/libvirt-domain.h
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+++ b/include/libvirt/libvirt-domain.h
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@@ -860,6 +860,14 @@ typedef enum {
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*/
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VIR_MIGRATE_NON_SHARED_SYNCHRONOUS_WRITES = (1 << 18),
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+ /* Use zero-copy mechanism for migrating memory pages. For QEMU/KVM this
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+ * means QEMU will be temporarily allowed to lock all guest pages in host's
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+ * memory, although only those that are queued for transfer will be locked
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+ * at the same time.
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+ *
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+ * Since: 8.5.0
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+ */
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+ VIR_MIGRATE_ZEROCOPY = (1 << 20),
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} virDomainMigrateFlags;
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--
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2.35.1
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