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mc146818rtc: add rtc-reset-reinjection QMP command

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It is necessary to reset RTC interrupt reinjection backlog if
guest time is synchronized via a different mechanism, such as
QGA's guest-set-time command.

Failing to do so causes both corrections to be applied (summed),
resulting in an incorrect guest time.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Marcelo Tosatti 2014-06-24 18:55:11 -03:00 • committed by Michael S. Tsirkin
parent fa118d1f8b
commit f2ae8abf1f
4 changed files with 60 additions and 0 deletions
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18
hw/timer/mc146818rtc.c
View file

@ -27,6 +27,7 @@
#include "hw/timer/mc146818rtc.h"
#include "qapi/visitor.h"
#include "qapi-event.h"
#include "qmp-commands.h"
#ifdef TARGET_I386
#include "hw/i386/apic.h"
@ -85,6 +86,7 @@ typedef struct RTCState {
Notifier clock_reset_notifier;
LostTickPolicy lost_tick_policy;
Notifier suspend_notifier;
QLIST_ENTRY(RTCState) link;
} RTCState;
static void rtc_set_time(RTCState *s);
@ -523,6 +525,20 @@ static void rtc_get_time(RTCState *s, struct tm *tm)
rtc_from_bcd(s, s->cmos_data[RTC_CENTURY]) * 100 - 1900;
}
static QLIST_HEAD(, RTCState) rtc_devices =
QLIST_HEAD_INITIALIZER(rtc_devices);
#ifdef TARGET_I386
void qmp_rtc_reset_reinjection(Error **errp)
{
RTCState *s;
QLIST_FOREACH(s, &rtc_devices, link) {
s->irq_coalesced = 0;
}
}
#endif
static void rtc_set_time(RTCState *s)
{
struct tm tm;
@ -911,6 +927,8 @@ ISADevice *rtc_init(ISABus *bus, int base_year, qemu_irq intercept_irq)
} else {
isa_init_irq(isadev, &s->irq, RTC_ISA_IRQ);
}
QLIST_INSERT_HEAD(&rtc_devices, s, link);
return isadev;
}