qemu-kvm/kvm-QIOChannelSocket-Introduce-assert-and-reduce-ifdefs-.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

83 lines
2.8 KiB
Diff

From 60bf942a58db12c821f2a6a49e2e0b04b99bec30 Mon Sep 17 00:00:00 2001
From: Leonardo Bras <leobras@redhat.com>
Date: Mon, 20 Jun 2022 02:39:42 -0300
Subject: [PATCH 15/18] QIOChannelSocket: Introduce assert and reduce ifdefs to
improve readability
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: [9/11] eaa02d68301852ccc98bdacc7387d8d03be1cb05 (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>
During implementation of MSG_ZEROCOPY feature, a lot of #ifdefs were
introduced, particularly at qio_channel_socket_writev().
Rewrite some of those changes so it's easier to read.
Also, introduce an assert to help detect incorrect zero-copy usage is when
it's disabled on build.
Signed-off-by: Leonardo Bras <leobras@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
dgilbert: Fixed up thinko'd g_assert_unreachable->g_assert_not_reached
(cherry picked from commit 803ca43e4c7fcf32f9f68c118301ccd0c83ece3f)
Signed-off-by: Leonardo Bras <leobras@redhat.com>
---
io/channel-socket.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/io/channel-socket.c b/io/channel-socket.c
index fbd2214d20..7490e5943d 100644
--- a/io/channel-socket.c
+++ b/io/channel-socket.c
@@ -579,11 +579,17 @@ static ssize_t qio_channel_socket_writev(QIOChannel *ioc,
memcpy(CMSG_DATA(cmsg), fds, fdsize);
}
-#ifdef QEMU_MSG_ZEROCOPY
if (flags & QIO_CHANNEL_WRITE_FLAG_ZERO_COPY) {
+#ifdef QEMU_MSG_ZEROCOPY
sflags = MSG_ZEROCOPY;
- }
+#else
+ /*
+ * We expect QIOChannel class entry point to have
+ * blocked this code path already
+ */
+ g_assert_not_reached();
#endif
+ }
retry:
ret = sendmsg(sioc->fd, &msg, sflags);
@@ -593,15 +599,13 @@ static ssize_t qio_channel_socket_writev(QIOChannel *ioc,
return QIO_CHANNEL_ERR_BLOCK;
case EINTR:
goto retry;
-#ifdef QEMU_MSG_ZEROCOPY
case ENOBUFS:
- if (sflags & MSG_ZEROCOPY) {
+ if (flags & QIO_CHANNEL_WRITE_FLAG_ZERO_COPY) {
error_setg_errno(errp, errno,
"Process can't lock enough memory for using MSG_ZEROCOPY");
return -1;
}
break;
-#endif
}
error_setg_errno(errp, errno,
--
2.35.3