From nobody Thu Nov 6 06:26:53 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=gmail.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 15392610306921006.8315658949689; Thu, 11 Oct 2018 05:30:30 -0700 (PDT) Received: from localhost ([::1]:34143 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gAa6n-0000dN-EC for importer@patchew.org; Thu, 11 Oct 2018 08:30:29 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41382) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gAa3l-0006bg-Q9 for qemu-devel@nongnu.org; Thu, 11 Oct 2018 08:27:24 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gAa3k-0007e3-RM for qemu-devel@nongnu.org; Thu, 11 Oct 2018 08:27:21 -0400 Received: from mail-lj1-x243.google.com ([2a00:1450:4864:20::243]:44771) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1gAa3k-0007d7-JI for qemu-devel@nongnu.org; Thu, 11 Oct 2018 08:27:20 -0400 Received: by mail-lj1-x243.google.com with SMTP id v6-v6so8008899ljc.11 for ; Thu, 11 Oct 2018 05:27:20 -0700 (PDT) Received: from localhost.localdomain ([77.221.221.49]) by smtp.gmail.com with ESMTPSA id 33-v6sm5713890lfu.64.2018.10.11.05.27.17 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 11 Oct 2018 05:27:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=iTpvEwhCW3Qu2a9KnBZWV1Ybe4KijxMSs52g6aOUgXo=; b=mHTB06mI8zqAqyqmicAGzj+WGonTXr1eXm01/OndPndCXOMubMNVAI69M7LrnpRlaU UDVcz6U1i1zTb62Ak2wwCXCcZdrwRZwObDm4H/oHNJMsMmhpJnlRQ1I9F9dQhHfZLU3Y sUBKn6AOThu/kv4OedMpI9pGqhhqdmUjWeZ7FvjNHS8JovrpJHIiOGNT1yDkRzHVHQ5I HEUQeNgxaF/g4tknIw2h+do/+UgXLKhUn4/u7mP+E8nm4Yae5iXT854h1pRKrYhEU2BU db6Rb8mE19kbvzV1eAmwNVR1lS7chURBIPmuffZEn1G2+5brSg6XsBIUK7KIOWzjlOVd /8Tw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=iTpvEwhCW3Qu2a9KnBZWV1Ybe4KijxMSs52g6aOUgXo=; b=r3kSI7q8NR2Hnwnxz00pToVSXbsV/Zi+6Ac/lfnz8UsO+NiOkunpqiwFM/JxLGaWdm +kbGl56d8aslDyUoZO8I6xYJJ7Pt0X8Pg8kZAPz2FB91gDAQiZRI++HOo3HLTuDF1L3M AmXZuoSs1jDHmU/WRvCBY0GuqYCBxqPaHegUD29o0sAaGpo8gCq7rGgAK9exWOKHm6a/ Af3bMTIFYRYOy+y4vT2RThtVrqk7UFpRtAFMpGdrZoFNibL5jMCPFkeM9nlIXffT5z8q na2TY3qKGAPxEHCbbTYVTwZ4otHN6c7uC1k5p/Dw5Dl2g6gzdq34jIdTjDy5QpG57mxU LC6w== X-Gm-Message-State: ABuFfoh9WQPb/+hBxXE7YwVpdtfdMhBjUoalBtjmfhVxzz6Iztc1eipG m5l1rnS7jGDPfXJmZROwglZsDq/j X-Google-Smtp-Source: ACcGV60Hvn5Qo984nmmEMfmtgUINfBiBIiaWJZj5z/vrvTfM80VxpkyeN5UvcGpkyXkTvliKnfvS1Q== X-Received: by 2002:a2e:21d2:: with SMTP id h79-v6mr1094087lji.46.1539260838474; Thu, 11 Oct 2018 05:27:18 -0700 (PDT) From: Artem Pisarenko To: qemu-devel@nongnu.org Date: Thu, 11 Oct 2018 18:23:18 +0600 Message-Id: <5299b9caab102ac99411cfb51e48f9ac5bb8027b.1539259394.git.artem.k.pisarenko@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: References: In-Reply-To: References: X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2a00:1450:4864:20::243 Subject: [Qemu-devel] [PATCH 3/4] Fixes RTC bug with base datetime shifts in clock=vm X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , Artem Pisarenko Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDMRC_1 RDKM_2 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" This makes all current "-rtc" option parameters combinations produce fixed/= unambiguous RTC timedate reference for hardware emulation frontends. It restores determinism of guest execution when used with clock=3Dvm and sp= ecified base value. Buglink: https://bugs.launchpad.net/qemu/+bug/1797033 Signed-off-by: Artem Pisarenko --- vl.c | 54 +++++++++++++++++++++++++++++++++--------------------- 1 file changed, 33 insertions(+), 21 deletions(-) diff --git a/vl.c b/vl.c index 3a1346f..d60018f 100644 --- a/vl.c +++ b/vl.c @@ -152,8 +152,10 @@ static enum { RTC_BASE_LOCALTIME, RTC_BASE_DATETIME, } rtc_base_type =3D RTC_BASE_UTC; -static int rtc_host_datetime_offset =3D -1; /* valid only for host rtc_clo= ck and - rtc_base_type=3DRTC_BASE_DATE= TIME */ +static time_t rtc_ref_start_datetime; +static int rtc_realtime_clock_offset; /* used only with QEMU_CLOCK_REALTIM= E */ +static int rtc_host_datetime_offset =3D -1; /* valid & used only with + RTC_BASE_DATETIME */ QEMUClockType rtc_clock; int vga_interface_type =3D VGA_NONE; static DisplayOptions dpy; @@ -785,32 +787,42 @@ void qemu_system_vmstop_request(RunState state) } =20 /***********************************************************/ -/* real time host monotonic timer */ - -static time_t qemu_timedate(void) +/* RTC reference time/date access */ +static time_t qemu_ref_timedate(void) { - return qemu_clock_get_ms(QEMU_CLOCK_HOST) / 1000; + time_t value =3D qemu_clock_get_ms(rtc_clock) / 1000; + switch (rtc_clock) { + case QEMU_CLOCK_REALTIME: + value -=3D rtc_realtime_clock_offset; + /* no break */ + case QEMU_CLOCK_VIRTUAL: + value +=3D rtc_ref_start_datetime; + break; + case QEMU_CLOCK_HOST: + if (rtc_base_type =3D=3D RTC_BASE_DATETIME) { + value -=3D rtc_host_datetime_offset; + } + break; + default: + assert(0); + } + return value; } =20 -/***********************************************************/ -/* RTC reference time/date access */ void qemu_get_timedate(struct tm *tm, int offset) { - time_t ti =3D qemu_timedate(); + time_t ti =3D qemu_ref_timedate(); =20 ti +=3D offset; =20 switch (rtc_base_type) { + case RTC_BASE_DATETIME: case RTC_BASE_UTC: gmtime_r(&ti, tm); break; case RTC_BASE_LOCALTIME: localtime_r(&ti, tm); break; - case RTC_BASE_DATETIME: - ti -=3D rtc_host_datetime_offset; - gmtime_r(&ti, tm); - break; } } =20 @@ -819,6 +831,7 @@ int qemu_timedate_diff(struct tm *tm) time_t seconds; =20 switch (rtc_base_type) { + case RTC_BASE_DATETIME: case RTC_BASE_UTC: seconds =3D mktimegm(tm); break; @@ -829,15 +842,12 @@ int qemu_timedate_diff(struct tm *tm) seconds =3D mktime(&tmp); break; } - case RTC_BASE_DATETIME: - seconds =3D mktimegm(tm) + rtc_host_datetime_offset; - break; } =20 - return seconds - qemu_timedate(); + return seconds - qemu_ref_timedate(); } =20 -static void configure_rtc_host_datetime_offset(const char *startdate) +static void configure_rtc_base_datetime(const char *startdate) { time_t rtc_start_datetime; struct tm tm; @@ -863,8 +873,8 @@ static void configure_rtc_host_datetime_offset(const ch= ar *startdate) "'2006-06-17T16:01:21' or '2006-06-17'\n"); exit(1); } - rtc_host_datetime_offset =3D (qemu_clock_get_ms(QEMU_CLOCK_HOST) / 100= 0) - - rtc_start_datetime; + rtc_host_datetime_offset =3D rtc_ref_start_datetime - rtc_start_dateti= me; + rtc_ref_start_datetime =3D rtc_start_datetime; } =20 static void configure_rtc(QemuOpts *opts) @@ -883,7 +893,7 @@ static void configure_rtc(QemuOpts *opts) replay_add_blocker(blocker); } else { rtc_base_type =3D RTC_BASE_DATETIME; - configure_rtc_host_datetime_offset(value); + configure_rtc_base_datetime(value); } } value =3D qemu_opt_get(opts, "clock"); @@ -3034,6 +3044,8 @@ int main(int argc, char **argv, char **envp) exit(1); } rtc_clock =3D QEMU_CLOCK_HOST; + rtc_ref_start_datetime =3D qemu_clock_get_ms(QEMU_CLOCK_HOST) / 1000; + rtc_realtime_clock_offset =3D qemu_clock_get_ms(QEMU_CLOCK_REALTIME) /= 1000; =20 QLIST_INIT (&vm_change_state_head); os_setup_early_signal_handling(); --=20 2.7.4