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Wait to receive QMP greeting before sending any monitor commands

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Technically speaking we should wait until we receive the QMP
greeting message before attempting to send any QMP monitor
commands. Mostly we've got away with this, but there is a race
in some QEMU which cause it to SEGV if you sent it data too
soon after startup. Waiting for the QMP greeting avoids the
race

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange 2012-09-06 16:14:25 +01:00
parent d2fdeb3b1e
commit 985a321ac0
2 changed files with 18 additions and 3 deletions
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9
src/qemu/qemu_monitor.c
View File

@ -79,6 +79,7 @@ struct _qemuMonitor {
unsigned json: 1;
unsigned json_hmp: 1;
unsigned wait_greeting: 1;
};
static virClassPtr qemuMonitorClass;
@ -365,6 +366,9 @@ qemuMonitorIOProcess(qemuMonitorPtr mon)
if (len < 0)
return -1;
if (len && mon->wait_greeting)
mon->wait_greeting = 0;
if (len < mon->bufferOffset) {
memmove(mon->buffer, mon->buffer + len, mon->bufferOffset - len);
mon->bufferOffset -= len;
@ -538,7 +542,8 @@ static void qemuMonitorUpdateWatch(qemuMonitorPtr mon)
if (mon->lastError.code == VIR_ERR_OK) {
events |= VIR_EVENT_HANDLE_READABLE;
if (mon->msg && mon->msg->txOffset < mon->msg->txLength)
if ((mon->msg && mon->msg->txOffset < mon->msg->txLength) &&
!mon->wait_greeting)
events |= VIR_EVENT_HANDLE_WRITABLE;
}
@ -718,6 +723,8 @@ qemuMonitorOpenInternal(virDomainObjPtr vm,
mon->hasSendFD = hasSendFD;
mon->vm = vm;
mon->json = json;
if (json)
mon->wait_greeting = 1;
mon->cb = cb;
qemuMonitorLock(mon);

12
tests/qemumonitortestutils.c
View File

@ -418,6 +418,9 @@ static qemuMonitorCallbacks qemuCallbacks = {
.errorNotify = qemuMonitorTestErrorNotify,
};
#define QEMU_JSON_GREETING "{\"QMP\": {\"version\": {\"qemu\": {\"micro\": 1, \"minor\": 0, \"major\": 1}, \"package\": \" (qemu-kvm-1.0.1)\"}, \"capabilities\": []}}"
#define QEMU_TEXT_GREETING "QEMU 1.0,1 monitor - type 'help' for more information"
qemuMonitorTestPtr qemuMonitorTestNew(bool json, virCapsPtr caps)
{
qemuMonitorTestPtr test;
@ -458,7 +461,7 @@ qemuMonitorTestPtr qemuMonitorTestNew(bool json, virCapsPtr caps)
if (!(test->mon = qemuMonitorOpen(test->vm,
&src,
true,
json ? 1 : 0,
&qemuCallbacks)))
goto error;
qemuMonitorLock(test->mon);
@ -468,8 +471,13 @@ qemuMonitorTestPtr qemuMonitorTestNew(bool json, virCapsPtr caps)
if (!test->client)
goto error;
if (qemuMonitorTestAddReponse(test, json ?
QEMU_JSON_GREETING :
QEMU_TEXT_GREETING) < 0)
goto error;
if (virNetSocketAddIOCallback(test->client,
VIR_EVENT_HANDLE_READABLE,
VIR_EVENT_HANDLE_WRITABLE,
qemuMonitorTestIO,
test,
NULL) < 0)