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From 32ee75b7f4a31d6080e5659e2a0285a046ef1036 Mon Sep 17 00:00:00 2001
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From: Juan Quintela <quintela@redhat.com>
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Date: Tue, 3 Mar 2020 14:51:34 +0000
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Subject: [PATCH 02/18] migration/multifd: clean pages after filling packet
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RH-Author: Juan Quintela <quintela@redhat.com>
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Message-id: <20200303145143.149290-2-quintela@redhat.com>
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Patchwork-id: 94112
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O-Subject: [RHEL-AV-8.2.0 qemu-kvm PATCH v2 01/10] migration/multifd: clean pages after filling packet
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Bugzilla: 1738451
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Peter Xu <peterx@redhat.com>
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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From: Wei Yang <richardw.yang@linux.intel.com>
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This is a preparation for the next patch:
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not use multifd during postcopy.
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Without enabling postcopy, everything looks good. While after enabling
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postcopy, migration may fail even not use multifd during postcopy. The
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reason is the pages is not properly cleared and *old* target page will
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continue to be transferred.
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After clean pages, migration succeeds.
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Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
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Reviewed-by: Juan Quintela <quintela@redhat.com>
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Signed-off-by: Juan Quintela <quintela@redhat.com>
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(cherry picked from commit eab54aa78ffd9fb7895b20fc2761ee998479489b)
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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migration/ram.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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diff --git a/migration/ram.c b/migration/ram.c
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index 5078f94..65580e3 100644
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--- a/migration/ram.c
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+++ b/migration/ram.c
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@@ -944,10 +944,10 @@ static int multifd_send_pages(RAMState *rs)
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}
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qemu_mutex_unlock(&p->mutex);
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}
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- p->pages->used = 0;
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+ assert(!p->pages->used);
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+ assert(!p->pages->block);
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p->packet_num = multifd_send_state->packet_num++;
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- p->pages->block = NULL;
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multifd_send_state->pages = p->pages;
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p->pages = pages;
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transferred = ((uint64_t) pages->used) * TARGET_PAGE_SIZE + p->packet_len;
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@@ -1129,6 +1129,8 @@ static void *multifd_send_thread(void *opaque)
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p->flags = 0;
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p->num_packets++;
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p->num_pages += used;
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+ p->pages->used = 0;
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+ p->pages->block = NULL;
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qemu_mutex_unlock(&p->mutex);
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trace_multifd_send(p->id, packet_num, used, flags,
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--
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1.8.3.1
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