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authorPeter Xu <peterx@redhat.com>2018-04-10 12:49:42 +0800
committerEric Blake <eblake@redhat.com>2018-04-10 07:49:43 -0500
commit951702f39c7e31530ce4ea65b11fe25ea1ea9c37 (patch)
treefe6a55441ed858754657c876f9b8f904fd97a14c
parent15544349277f988ea22d7037d41488de819bc92a (diff)
downloadqemu-arm-951702f39c7e31530ce4ea65b11fe25ea1ea9c37.tar.gz
monitor: bind dispatch bh to iohandler context
Eric Auger reported the problem days ago that OOB broke ARM when running with libvirt: http://lists.gnu.org/archive/html/qemu-devel/2018-03/msg06231.html The problem was that the monitor dispatcher bottom half was bound to qemu_aio_context now, which could be polled unexpectedly in block code. We should keep the dispatchers run in iohandler_ctx just like what we did before the Out-Of-Band series (chardev uses qio, and qio binds everything with iohandler_ctx). If without this change, QMP dispatcher might be run even before reaching main loop in block IO path, for example, in a stack like (the ARM case, "cont" command handler run even during machine init phase): #0 qmp_cont () #1 0x00000000006bd210 in qmp_marshal_cont () #2 0x0000000000ac05c4 in do_qmp_dispatch () #3 0x0000000000ac07a0 in qmp_dispatch () #4 0x0000000000472d60 in monitor_qmp_dispatch_one () #5 0x000000000047302c in monitor_qmp_bh_dispatcher () #6 0x0000000000acf374 in aio_bh_call () #7 0x0000000000acf428 in aio_bh_poll () #8 0x0000000000ad5110 in aio_poll () #9 0x0000000000a08ab8 in blk_prw () #10 0x0000000000a091c4 in blk_pread () #11 0x0000000000734f94 in pflash_cfi01_realize () #12 0x000000000075a3a4 in device_set_realized () #13 0x00000000009a26cc in property_set_bool () #14 0x00000000009a0a40 in object_property_set () #15 0x00000000009a3a08 in object_property_set_qobject () #16 0x00000000009a0c8c in object_property_set_bool () #17 0x0000000000758f94 in qdev_init_nofail () #18 0x000000000058e190 in create_one_flash () #19 0x000000000058e2f4 in create_flash () #20 0x00000000005902f0 in machvirt_init () #21 0x00000000007635cc in machine_run_board_init () #22 0x00000000006b135c in main () Actually the problem is more severe than that. After we switched to the qemu AIO handler it means the monitor dispatcher code can even be called with nested aio_poll(), then it can be an explicit aio_poll() inside another main loop aio_poll() which could be racy too; breaking code like TPM and 9p that use nested event loops. Switch to use the iohandler_ctx for monitor dispatchers. My sincere thanks to Eric Auger who offered great help during both debugging and verifying the problem. The ARM test was carried out by applying this patch upon QEMU 2.12.0-rc0 and problem is gone after the patch. A quick test of mine shows that after this patch applied we can pass all raw iotests even with OOB on by default. CC: Eric Blake <eblake@redhat.com> CC: Markus Armbruster <armbru@redhat.com> CC: Stefan Hajnoczi <stefanha@redhat.com> CC: Fam Zheng <famz@redhat.com> Reported-by: Eric Auger <eric.auger@redhat.com> Tested-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <20180410044942.17059-1-peterx@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Eric Blake <eblake@redhat.com>
-rw-r--r--monitor.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/monitor.c b/monitor.c
index 51f4cf480f..39f8ee17ba 100644
--- a/monitor.c
+++ b/monitor.c
@@ -4467,7 +4467,7 @@ static void monitor_iothread_init(void)
* have assumption to be run on main loop thread. It would be
* nice that one day we can remove this assumption in the future.
*/
- mon_global.qmp_dispatcher_bh = aio_bh_new(qemu_get_aio_context(),
+ mon_global.qmp_dispatcher_bh = aio_bh_new(iohandler_get_aio_context(),
monitor_qmp_bh_dispatcher,
NULL);