qemu-kvm/kvm-QIOChannelSocket-Fix-zero-copy-send-so-socket-flush-.patch
Camilla Conte da38d5c28e * Tue Jul 05 2022 Camilla Conte <cconte@redhat.com> - 7.0.0-8
- kvm-tests-avocado-update-aarch64_virt-test-to-exercise-c.patch [bz#2060839]
- kvm-RHEL-only-tests-avocado-Switch-aarch64-tests-from-a5.patch [bz#2060839]
- kvm-RHEL-only-AArch64-Drop-unsupported-CPU-types.patch [bz#2060839]
- kvm-target-i386-deprecate-CPUs-older-than-x86_64-v2-ABI.patch [bz#2060839]
- kvm-target-s390x-deprecate-CPUs-older-than-z14.patch [bz#2060839]
- kvm-target-arm-deprecate-named-CPU-models.patch [bz#2060839]
- kvm-meson.build-Fix-docker-test-build-alpine-when-includ.patch [bz#1968509]
- kvm-QIOChannel-Add-flags-on-io_writev-and-introduce-io_f.patch [bz#1968509]
- kvm-QIOChannelSocket-Implement-io_writev-zero-copy-flag-.patch [bz#1968509]
- kvm-migration-Add-zero-copy-send-parameter-for-QMP-HMP-f.patch [bz#1968509]
- kvm-migration-Add-migrate_use_tls-helper.patch [bz#1968509]
- kvm-multifd-multifd_send_sync_main-now-returns-negative-.patch [bz#1968509]
- kvm-multifd-Send-header-packet-without-flags-if-zero-cop.patch [bz#1968509]
- kvm-multifd-Implement-zero-copy-write-in-multifd-migrati.patch [bz#1968509]
- kvm-QIOChannelSocket-Introduce-assert-and-reduce-ifdefs-.patch [bz#1968509]
- kvm-QIOChannelSocket-Fix-zero-copy-send-so-socket-flush-.patch [bz#1968509]
- kvm-migration-Change-zero_copy_send-from-migration-param.patch [bz#1968509]
- kvm-migration-Allow-migrate-recover-to-run-multiple-time.patch [bz#2096143]
- Resolves: bz#2060839
  (Consider deprecating CPU models like "kvm64" / "qemu64" on RHEL 9)
- Resolves: bz#1968509
  (Use MSG_ZEROCOPY on QEMU Live Migration)
- Resolves: bz#2096143
  (The migration port is not released if use it again for recovering postcopy migration)
2022-07-05 10:49:23 +00:00

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From e70f01749addd7d0b7aa7fa4fdedb664f98e6b9b Mon Sep 17 00:00:00 2001
From: Leonardo Bras <leobras@redhat.com>
Date: Mon, 20 Jun 2022 02:39:43 -0300
Subject: [PATCH 16/18] QIOChannelSocket: Fix zero-copy send so socket flush
works
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Leonardo Brás <leobras@redhat.com>
RH-MergeRequest: 95: MSG_ZEROCOPY + Multifd
RH-Commit: [10/11] a2dfac987e24026b1a78e90b86234ca206b6401f (LeoBras/centos-qemu-kvm)
RH-Bugzilla: 1968509
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
RH-Acked-by: Peter Xu <peterx@redhat.com>
Somewhere between v6 and v7 the of the zero-copy-send patchset a crucial
part of the flushing mechanism got missing: incrementing zero_copy_queued.
Without that, the flushing interface becomes a no-op, and there is no
guarantee the buffer is really sent.
This can go as bad as causing a corruption in RAM during migration.
Fixes: 2bc58ffc2926 ("QIOChannelSocket: Implement io_writev zero copy flag & io_flush for CONFIG_LINUX")
Reported-by: 徐闯 <xuchuangxclwt@bytedance.com>
Signed-off-by: Leonardo Bras <leobras@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
(cherry picked from commit 4f5a09714c983a3471fd12e3c7f3196e95c650c1)
Signed-off-by: Leonardo Bras <leobras@redhat.com>
---
io/channel-socket.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/io/channel-socket.c b/io/channel-socket.c
index 7490e5943d..8ae8b212cf 100644
--- a/io/channel-socket.c
+++ b/io/channel-socket.c
@@ -612,6 +612,11 @@ static ssize_t qio_channel_socket_writev(QIOChannel *ioc,
"Unable to write to socket");
return -1;
}
+
+ if (flags & QIO_CHANNEL_WRITE_FLAG_ZERO_COPY) {
+ sioc->zero_copy_queued++;
+ }
+
return ret;
}
#else /* WIN32 */
--
2.35.3