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qmp: add command "x-oob-test"

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This command is only used to test OOB functionality.  It should not be
used for any other purposes.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20180309090006.10018-22-peterx@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[eblake: grammar tweak]
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Peter Xu 2018-03-09 17:00:04 +08:00 committed by Eric Blake
parent 3fd2457d18
commit 469638f9cb
2 changed files with 34 additions and 0 deletions
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18
qapi/misc.json
View File

@ -3427,3 +3427,21 @@
##
{ 'event': 'COMMAND_DROPPED' ,
'data': { 'id': 'any', 'reason': 'CommandDropReason' } }
##
# @x-oob-test:
#
# Test OOB functionality. When sending this command with lock=true,
# it'll try to hang the dispatcher. When sending it with lock=false,
# it'll try to notify the locked thread to continue. Note: it should
# only be used by QMP test program rather than anything else.
#
# Since: 2.12
#
# Example:
#
# { "execute": "x-oob-test",
# "arguments": { "lock": true } }
##
{ 'command': 'x-oob-test', 'data' : { 'lock': 'bool' },
'allow-oob': true }

16
qmp.c
View File

@ -770,3 +770,19 @@ MemoryInfo *qmp_query_memory_size_summary(Error **errp)
return mem_info;
}
static QemuSemaphore x_oob_test_sem;
static void __attribute__((constructor)) x_oob_test_init(void)
{
qemu_sem_init(&x_oob_test_sem, 0);
}
void qmp_x_oob_test(bool lock, Error **errp)
{
if (lock) {
qemu_sem_wait(&x_oob_test_sem);
} else {
qemu_sem_post(&x_oob_test_sem);
}
}