qemu-kvm/SOURCES/kvm-qio-Inherit-follow_coroutine_ctx-across-TLS.patch

130 lines
4.7 KiB
Diff

From fef17d3466deba9b4d581604de1c64c210d1a454 Mon Sep 17 00:00:00 2001
From: Eric Blake <eblake@redhat.com>
Date: Fri, 17 May 2024 21:50:14 -0500
Subject: [PATCH 1/4] qio: Inherit follow_coroutine_ctx across TLS
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RH-Author: Eric Blake <eblake@redhat.com>
RH-MergeRequest: 244: qio: Inherit follow_coroutine_ctx across TLS
RH-Jira: RHEL-33440
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Commit: [1/2] 447b144638a1f032fa036838f5f1839628389fe5 (ebblake/centos-qemu-kvm)
Since qemu 8.2, the combination of NBD + TLS + iothread crashes on an
assertion failure:
qemu-kvm: ../io/channel.c:534: void qio_channel_restart_read(void *): Assertion `qemu_get_current_aio_context() == qemu_coroutine_get_aio_context(co)' failed.
It turns out that when we removed AioContext locking, we did so by
having NBD tell its qio channels that it wanted to opt in to
qio_channel_set_follow_coroutine_ctx(); but while we opted in on the
main channel, we did not opt in on the TLS wrapper channel.
qemu-iotests has coverage of NBD+iothread and NBD+TLS, but apparently
no coverage of NBD+TLS+iothread, or we would have noticed this
regression sooner. (I'll add that in the next patch)
But while we could manually opt in to the TLS channel in nbd/server.c
(a one-line change), it is more generic if all qio channels that wrap
other channels inherit the follow status, in the same way that they
inherit feature bits.
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Daniel P. Berrangé <berrange@redhat.com>
CC: qemu-stable@nongnu.org
Fixes: https://issues.redhat.com/browse/RHEL-34786
Fixes: 06e0f098 ("io: follow coroutine AioContext in qio_channel_yield()", v8.2.0)
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-ID: <20240518025246.791593-5-eblake@redhat.com>
(cherry picked from commit 199e84de1c903ba5aa1f7256310bbc4a20dd930b)
Jira: https://issues.redhat.com/browse/RHEL-33440
Signed-off-by: Eric Blake <eblake@redhat.com>
---
io/channel-tls.c | 26 +++++++++++++++-----------
io/channel-websock.c | 1 +
2 files changed, 16 insertions(+), 11 deletions(-)
diff --git a/io/channel-tls.c b/io/channel-tls.c
index 1d9c9c72bf..67b9700006 100644
--- a/io/channel-tls.c
+++ b/io/channel-tls.c
@@ -69,37 +69,40 @@ qio_channel_tls_new_server(QIOChannel *master,
const char *aclname,
Error **errp)
{
- QIOChannelTLS *ioc;
+ QIOChannelTLS *tioc;
+ QIOChannel *ioc;
- ioc = QIO_CHANNEL_TLS(object_new(TYPE_QIO_CHANNEL_TLS));
+ tioc = QIO_CHANNEL_TLS(object_new(TYPE_QIO_CHANNEL_TLS));
+ ioc = QIO_CHANNEL(tioc);
- ioc->master = master;
+ tioc->master = master;
+ ioc->follow_coroutine_ctx = master->follow_coroutine_ctx;
if (qio_channel_has_feature(master, QIO_CHANNEL_FEATURE_SHUTDOWN)) {
- qio_channel_set_feature(QIO_CHANNEL(ioc), QIO_CHANNEL_FEATURE_SHUTDOWN);
+ qio_channel_set_feature(ioc, QIO_CHANNEL_FEATURE_SHUTDOWN);
}
object_ref(OBJECT(master));
- ioc->session = qcrypto_tls_session_new(
+ tioc->session = qcrypto_tls_session_new(
creds,
NULL,
aclname,
QCRYPTO_TLS_CREDS_ENDPOINT_SERVER,
errp);
- if (!ioc->session) {
+ if (!tioc->session) {
goto error;
}
qcrypto_tls_session_set_callbacks(
- ioc->session,
+ tioc->session,
qio_channel_tls_write_handler,
qio_channel_tls_read_handler,
- ioc);
+ tioc);
- trace_qio_channel_tls_new_server(ioc, master, creds, aclname);
- return ioc;
+ trace_qio_channel_tls_new_server(tioc, master, creds, aclname);
+ return tioc;
error:
- object_unref(OBJECT(ioc));
+ object_unref(OBJECT(tioc));
return NULL;
}
@@ -116,6 +119,7 @@ qio_channel_tls_new_client(QIOChannel *master,
ioc = QIO_CHANNEL(tioc);
tioc->master = master;
+ ioc->follow_coroutine_ctx = master->follow_coroutine_ctx;
if (qio_channel_has_feature(master, QIO_CHANNEL_FEATURE_SHUTDOWN)) {
qio_channel_set_feature(ioc, QIO_CHANNEL_FEATURE_SHUTDOWN);
}
diff --git a/io/channel-websock.c b/io/channel-websock.c
index a12acc27cf..de39f0d182 100644
--- a/io/channel-websock.c
+++ b/io/channel-websock.c
@@ -883,6 +883,7 @@ qio_channel_websock_new_server(QIOChannel *master)
ioc = QIO_CHANNEL(wioc);
wioc->master = master;
+ ioc->follow_coroutine_ctx = master->follow_coroutine_ctx;
if (qio_channel_has_feature(master, QIO_CHANNEL_FEATURE_SHUTDOWN)) {
qio_channel_set_feature(ioc, QIO_CHANNEL_FEATURE_SHUTDOWN);
}
--
2.39.3