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[Qemu-devel] [PATCH v2] mc146818rtc: add rtc-reset-reinjection QMP comma
From: |
Marcelo Tosatti |
Subject: |
[Qemu-devel] [PATCH v2] mc146818rtc: add rtc-reset-reinjection QMP command |
Date: |
Tue, 17 Jun 2014 12:47:51 -0300 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
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 <address@hidden>
diff --git a/hw/timer/mc146818rtc.c b/hw/timer/mc146818rtc.c
index df54546..1782c4e 100644
--- a/hw/timer/mc146818rtc.c
+++ b/hw/timer/mc146818rtc.c
@@ -26,6 +26,7 @@
#include "sysemu/sysemu.h"
#include "hw/timer/mc146818rtc.h"
#include "qapi/visitor.h"
+#include "qmp-commands.h"
#ifdef TARGET_I386
#include "hw/i386/apic.h"
@@ -84,6 +85,7 @@ 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);
@@ -522,6 +524,20 @@ 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;
}
diff --git a/qapi-schema.json b/qapi-schema.json
index 7bc33ea..a4e2c21 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -4722,3 +4722,15 @@
'btn' : 'InputBtnEvent',
'rel' : 'InputMoveEvent',
'abs' : 'InputMoveEvent' } }
+
+##
+# @rtc-reset-reinjection
+#
+# This command will reset the RTC interrupt reinjection backlog.
+# Can be used if another mechanism to synchronize guest time
+# is in effect, for example QEMU guest agent's guest-set-time
+# command.
+#
+# Since: 2.1
+##
+{ 'command': 'rtc-reset-reinjection' }
diff --git a/qmp-commands.hx b/qmp-commands.hx
index d8aa4ed..dc43789 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -3572,3 +3572,26 @@ Example:
} } ] }
EQMP
+
+#if defined (TARGET_I386)
+ {
+ .name = "rtc-reset-reinjection",
+ .args_type = "",
+ .mhandler.cmd_new = qmp_marshal_input_rtc_reset_reinjection,
+ },
+#endif
+
+SQMP
+rtc-reset-reinjection
+---------------------
+
+Reset the RTC interrupt reinjection backlog.
+
+Arguments: None.
+
+Example:
+
+-> { "execute": "rtc-reset-reinjection" }
+<- { "return": {} }
+
+EQMP
- [Qemu-devel] [PATCH v2] mc146818rtc: add rtc-reset-reinjection QMP command,
Marcelo Tosatti <=