From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56377) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WwvcP-0003Ji-0j for qemu-devel@nongnu.org; Tue, 17 Jun 2014 11:48:24 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WwvcI-0006jj-Si for qemu-devel@nongnu.org; Tue, 17 Jun 2014 11:48:16 -0400 Received: from mx1.redhat.com ([209.132.183.28]:9085) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WwvcI-0006jV-K2 for qemu-devel@nongnu.org; Tue, 17 Jun 2014 11:48:10 -0400 Date: Tue, 17 Jun 2014 12:47:51 -0300 From: Marcelo Tosatti Message-ID: <20140617154751.GA3947@amt.cnet> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Subject: [Qemu-devel] [PATCH v2] mc146818rtc: add rtc-reset-reinjection QMP command List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Michael S. Tsirkin" Cc: gleb@kernel.org, mprivozn@redhat.com, pbonzini@redhat.com, qemu-devel@nongnu.org, armbru@redhat.com 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 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" =20 #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; =20 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; } =20 +static QLIST_HEAD(, RTCState) rtc_devices =3D + 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 =3D 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; } =20 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: } }=A0] } =20 EQMP + +#if defined (TARGET_I386) + { + .name =3D "rtc-reset-reinjection", + .args_type =3D "", + .mhandler.cmd_new =3D 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