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qtest: add clock management

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This patch combines qtest and -icount together to turn the vm_clock
into a source that can be fully managed by the client.  To this end new
commands clock_step and clock_set are added.  Hooking them with libqtest
is left as an exercise to the reader.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Paolo Bonzini 2012-03-28 15:42:04 +02:00 • committed by Anthony Liguori
parent 2028834574
commit 8156be5610
5 changed files with 69 additions and 1 deletions
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20
cpus.c
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@ -34,6 +34,7 @@
#include "qemu-thread.h"
#include "cpus.h"
#include "qtest.h"
#include "main-loop.h"
#ifndef _WIN32
@ -238,6 +239,20 @@ static void icount_warp_rt(void *opaque)
vm_clock_warp_start = -1;
}
void qtest_clock_warp(int64_t dest)
{
int64_t clock = qemu_get_clock_ns(vm_clock);
assert(qtest_enabled());
while (clock < dest) {
int64_t deadline = qemu_clock_deadline(vm_clock);
int64_t warp = MIN(dest - clock, deadline);
qemu_icount_bias += warp;
qemu_run_timers(vm_clock);
clock = qemu_get_clock_ns(vm_clock);
}
qemu_notify_event();
}
void qemu_clock_warp(QEMUClock *clock)
{
int64_t deadline;
@ -264,6 +279,11 @@ void qemu_clock_warp(QEMUClock *clock)
return;
}
if (qtest_enabled()) {
/* When testing, qtest commands advance icount. */
return;
}
vm_clock_warp_start = qemu_get_clock_ns(rt_clock);
deadline = qemu_clock_deadline(vm_clock);
if (deadline > 0) {