85d5f0ed1b
- kvm-QIOChannelSocket-Fix-zero-copy-flush-returning-code-.patch [bz#2107466] - kvm-Add-dirty-sync-missed-zero-copy-migration-stat.patch [bz#2107466] - kvm-migration-multifd-Report-to-user-when-zerocopy-not-w.patch [bz#2107466] - kvm-migration-Avoid-false-positive-on-non-supported-scen.patch [bz#2107466] - kvm-migration-add-remaining-params-has_-true-in-migratio.patch [bz#2107466] - kvm-QIOChannelSocket-Add-support-for-MSG_ZEROCOPY-IPV6.patch [bz#2107466] - kvm-pc-bios-s390-ccw-Fix-booting-with-logical-block-size.patch [bz#2112303] - kvm-vdpa-Fix-bad-index-calculus-at-vhost_vdpa_get_vring_.patch [bz#2116876] - kvm-vdpa-Fix-index-calculus-at-vhost_vdpa_svqs_start.patch [bz#2116876] - kvm-vdpa-Fix-memory-listener-deletions-of-iova-tree.patch [bz#2116876] - kvm-vdpa-Fix-file-descriptor-leak-on-get-features-error.patch [bz#2116876] - Resolves: bz#2107466 (zerocopy capability can be enabled when set migrate capabilities with multifd and compress/xbzrle together) - Resolves: bz#2112303 (virtio-blk: Can't boot fresh installation from used 512 cluster_size image under certain conditions) - Resolves: bz#2116876 (Fixes for vDPA control virtqueue support in Qemu)
66 lines
2.3 KiB
Diff
66 lines
2.3 KiB
Diff
From 678981c6bb7c964e1591f6f8aba49e9602f64852 Mon Sep 17 00:00:00 2001
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From: Leonardo Bras <leobras@redhat.com>
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Date: Mon, 11 Jul 2022 18:11:11 -0300
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Subject: [PATCH 01/11] QIOChannelSocket: Fix zero-copy flush returning code 1
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when nothing sent
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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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RH-Author: Leonardo Brás <leobras@redhat.com>
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RH-MergeRequest: 111: zero-copy-send fixes & improvements
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RH-Commit: [1/6] cebc887cb61de1572d8ae3232cde45e80c339404 (LeoBras/centos-qemu-kvm)
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RH-Bugzilla: 2107466
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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If flush is called when no buffer was sent with MSG_ZEROCOPY, it currently
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returns 1. This return code should be used only when Linux fails to use
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MSG_ZEROCOPY on a lot of sendmsg().
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Fix this by returning early from flush if no sendmsg(...,MSG_ZEROCOPY)
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was attempted.
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Fixes: 2bc58ffc2926 ("QIOChannelSocket: Implement io_writev zero copy flag & io_flush for CONFIG_LINUX")
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Signed-off-by: Leonardo Bras <leobras@redhat.com>
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Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
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Acked-by: Daniel P. Berrangé <berrange@redhat.com>
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Reviewed-by: Juan Quintela <quintela@redhat.com>
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Reviewed-by: Peter Xu <peterx@redhat.com>
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Message-Id: <20220711211112.18951-2-leobras@redhat.com>
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Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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(cherry picked from commit 927f93e099c4f9184e60a1bc61624ac2d04d0223)
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Signed-off-by: Leonardo Bras <leobras@redhat.com>
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---
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io/channel-socket.c | 8 +++++++-
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1 file changed, 7 insertions(+), 1 deletion(-)
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diff --git a/io/channel-socket.c b/io/channel-socket.c
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index 8ae8b212cf..eb7baa2184 100644
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--- a/io/channel-socket.c
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+++ b/io/channel-socket.c
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@@ -717,12 +717,18 @@ static int qio_channel_socket_flush(QIOChannel *ioc,
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struct cmsghdr *cm;
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char control[CMSG_SPACE(sizeof(*serr))];
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int received;
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- int ret = 1;
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+ int ret;
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+
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+ if (sioc->zero_copy_queued == sioc->zero_copy_sent) {
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+ return 0;
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+ }
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msg.msg_control = control;
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msg.msg_controllen = sizeof(control);
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memset(control, 0, sizeof(control));
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+ ret = 1;
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+
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while (sioc->zero_copy_sent < sioc->zero_copy_queued) {
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received = recvmsg(sioc->fd, &msg, MSG_ERRQUEUE);
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if (received < 0) {
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--
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2.31.1
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