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qmp: Move dispatcher to a coroutine

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This moves the QMP dispatcher to a coroutine and runs all QMP command
handlers that declare 'coroutine': true in coroutine context so they
can avoid blocking the main loop while doing I/O or waiting for other
events.

For commands that are not declared safe to run in a coroutine, the
dispatcher drops out of coroutine context by calling the QMP command
handler from a bottom half.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20201005155855.256490-10-kwolf@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Kevin Wolf 2020-10-05 17:58:50 +02:00 • committed by Markus Armbruster
parent 04f22362f1
commit 9ce44e2ce2
7 changed files with 213 additions and 45 deletions
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8
util/aio-posix.c
View file

@ -15,6 +15,7 @@
#include "qemu/osdep.h"
#include "block/block.h"
#include "qemu/main-loop.h"
#include "qemu/rcu.h"
#include "qemu/rcu_queue.h"
#include "qemu/sockets.h"
@ -558,8 +559,13 @@ bool aio_poll(AioContext *ctx, bool blocking)
* There cannot be two concurrent aio_poll calls for the same AioContext (or
* an aio_poll concurrent with a GSource prepare/check/dispatch callback).
* We rely on this below to avoid slow locked accesses to ctx->notify_me.
*
* aio_poll() may only be called in the AioContext's thread. iohandler_ctx
* is special in that it runs in the main thread, but that thread's context
* is qemu_aio_context.
*/
assert(in_aio_context_home_thread(ctx));
assert(in_aio_context_home_thread(ctx == iohandler_get_aio_context() ?
qemu_get_aio_context() : ctx));
qemu_lockcnt_inc(&ctx->list_lock);