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Tsirkin" Cc: Daniil Tatianin , Paolo Bonzini , Eric Blake , Markus Armbruster , qemu-devel@nongnu.org Subject: [PATCH v3] mc146818rtc: add a way to generate RTC interrupts via QMP Date: Mon, 6 May 2024 11:34:20 +0300 Message-Id: <20240506083420.557726-1-d-tatianin@yandex-team.ru> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=178.154.239.136; envelope-from=d-tatianin@yandex-team.ru; helo=forwardcorp1b.mail.yandex.net X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @yandex-team.ru) X-ZM-MESSAGEID: 1714984599502100003 Content-Type: text/plain; charset="utf-8" This can be used to force-synchronize the time in guest after a long stop-cont pause, which can be useful for serverless-type workload. Also add a comment to highlight the fact that this (and one other QMP command) only works for the MC146818 RTC controller. Signed-off-by: Daniil Tatianin Acked-by: Philippe Mathieu-Daud=C3=A9 --- Changes since v0: - Rename to rtc-inject-irq to match other similar API - Add a comment to highlight that this only works for the I386 RTC Changes since v1: - Added a description below the QMP command to explain how it can be used and what it does. Changes since v2: - Add a 'broadcast' suffix. - Change the comments to explain the flags we're setting. - Change the command description to fix styling & explain that it's a broad= cast command. --- hw/rtc/mc146818rtc.c | 20 ++++++++++++++++++++ include/hw/rtc/mc146818rtc.h | 1 + qapi/misc-target.json | 19 +++++++++++++++++++ 3 files changed, 40 insertions(+) diff --git a/hw/rtc/mc146818rtc.c b/hw/rtc/mc146818rtc.c index 3379f92748..2b3754f5c6 100644 --- a/hw/rtc/mc146818rtc.c +++ b/hw/rtc/mc146818rtc.c @@ -107,6 +107,11 @@ static void rtc_coalesced_timer_update(MC146818RtcStat= e *s) static QLIST_HEAD(, MC146818RtcState) rtc_devices =3D QLIST_HEAD_INITIALIZER(rtc_devices); =20 +/* + * NOTE: + * The two QMP functions below are _only_ implemented for the MC146818. + * All other RTC devices ignore this. + */ void qmp_rtc_reset_reinjection(Error **errp) { MC146818RtcState *s; @@ -116,6 +121,21 @@ void qmp_rtc_reset_reinjection(Error **errp) } } =20 +void qmp_rtc_inject_irq_broadcast(Error **errp) +{ + MC146818RtcState *s; + + QLIST_FOREACH(s, &rtc_devices, link) { + // Update-ended interrupt enable + s->cmos_data[RTC_REG_B] |=3D REG_B_UIE; + + // Interrupt request flag | update interrupt flag + s->cmos_data[RTC_REG_C] |=3D REG_C_IRQF | REG_C_UF; + + qemu_irq_raise(s->irq); + } +} + static bool rtc_policy_slew_deliver_irq(MC146818RtcState *s) { kvm_reset_irq_delivered(); diff --git a/include/hw/rtc/mc146818rtc.h b/include/hw/rtc/mc146818rtc.h index 97cec0b3e8..e9dd0f9c72 100644 --- a/include/hw/rtc/mc146818rtc.h +++ b/include/hw/rtc/mc146818rtc.h @@ -56,5 +56,6 @@ MC146818RtcState *mc146818_rtc_init(ISABus *bus, int base= _year, void mc146818rtc_set_cmos_data(MC146818RtcState *s, int addr, int val); int mc146818rtc_get_cmos_data(MC146818RtcState *s, int addr); void qmp_rtc_reset_reinjection(Error **errp); +void qmp_rtc_inject_irq_broadcast(Error **errp); =20 #endif /* HW_RTC_MC146818RTC_H */ diff --git a/qapi/misc-target.json b/qapi/misc-target.json index 4e0a6492a9..7d388a3753 100644 --- a/qapi/misc-target.json +++ b/qapi/misc-target.json @@ -19,6 +19,25 @@ { 'command': 'rtc-reset-reinjection', 'if': 'TARGET_I386' } =20 +## +# @rtc-inject-irq-broadcast: +# +# Inject an RTC interrupt for all existing RTCs on the system. +# The interrupt forces the guest to synchronize the time with RTC. +# This is useful after a long stop-cont pause, which is common for +# serverless-type workload. +# +# Since: 9.1 +# +# Example: +# +# -> { "execute": "rtc-inject-irq-broadcast" } +# <- { "return": {} } +# +## +{ 'command': 'rtc-inject-irq-broadcast', + 'if': 'TARGET_I386' } + ## # @SevState: # --=20 2.34.1