qemu-kvm/SOURCES/kvm-multifd-Protect-multifd_send_sync_main-calls.patch
2023-11-07 09:43:59 +00:00

79 lines
2.7 KiB
Diff

From c4bfb4900b95e13bef2d86b83c33786c7c4f6289 Mon Sep 17 00:00:00 2001
From: Juan Quintela <quintela@redhat.com>
Date: Tue, 21 Jun 2022 12:21:32 +0200
Subject: [PATCH 06/12] multifd: Protect multifd_send_sync_main() calls
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: quintela1 <quintela@redhat.com>
RH-MergeRequest: 186: Multifd flushes its channels 10 times per second
RH-Bugzilla: 2196295
RH-Acked-by: Peter Xu <peterx@redhat.com>
RH-Acked-by: Leonardo Brás <leobras@redhat.com>
RH-Commit: [2/3] a91adf59c6b2f39bf4a308f566b00e39cae6e0ae (juan.quintela/c9s-qemu-kvm)
We only need to do that on the ram_save_iterate() call on sending and
on destination when we get a RAM_SAVE_FLAG_EOS.
In setup() and complete() we need to synch in both new and old cases,
so don't add a check there.
Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Acked-by: Peter Xu <peterx@redhat.com>
---
Remove the wrappers that we take out on patch 5.
(cherry picked from commit b05292c237030343516d073b1a1e5f49ffc017a8)
---
migration/ram.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/migration/ram.c b/migration/ram.c
index 01356f60a4..1e2414d681 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -3394,9 +3394,11 @@ static int ram_save_iterate(QEMUFile *f, void *opaque)
out:
if (ret >= 0
&& migration_is_setup_or_active(migrate_get_current()->state)) {
- ret = multifd_send_sync_main(rs->pss[RAM_CHANNEL_PRECOPY].pss_channel);
- if (ret < 0) {
- return ret;
+ if (migrate_multifd_flush_after_each_section()) {
+ ret = multifd_send_sync_main(rs->pss[RAM_CHANNEL_PRECOPY].pss_channel);
+ if (ret < 0) {
+ return ret;
+ }
}
qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
@@ -4153,7 +4155,9 @@ int ram_load_postcopy(QEMUFile *f, int channel)
case RAM_SAVE_FLAG_EOS:
/* normal exit */
- multifd_recv_sync_main();
+ if (migrate_multifd_flush_after_each_section()) {
+ multifd_recv_sync_main();
+ }
break;
default:
error_report("Unknown combination of migration flags: 0x%x"
@@ -4424,7 +4428,9 @@ static int ram_load_precopy(QEMUFile *f)
break;
case RAM_SAVE_FLAG_EOS:
/* normal exit */
- multifd_recv_sync_main();
+ if (migrate_multifd_flush_after_each_section()) {
+ multifd_recv_sync_main();
+ }
break;
default:
if (flags & RAM_SAVE_FLAG_HOOK) {
--
2.39.3