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X-Received-From: 2a00:1450:4864:20::32f Subject: [Qemu-devel] [PULL 18/48] 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: 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" From: Artem Pisarenko 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 specified base value. Buglink: https://bugs.launchpad.net/qemu/+bug/1797033 Signed-off-by: Artem Pisarenko Message-Id: <1d963c3e013dfedafa1f6edb9fb219b7e49e39da.1539846575.git.artem.= k.pisarenko@gmail.com> Signed-off-by: Paolo Bonzini --- vl.c | 62 +++++++++++++++++++++++++++++++++++++++----------------------- 1 file changed, 39 insertions(+), 23 deletions(-) diff --git a/vl.c b/vl.c index d15e086..5bb53f7 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; @@ -247,6 +249,7 @@ static struct { static QemuOptsList qemu_rtc_opts =3D { .name =3D "rtc", .head =3D QTAILQ_HEAD_INITIALIZER(qemu_rtc_opts.head), + .merge_lists =3D true, .desc =3D { { .name =3D "base", @@ -785,32 +788,42 @@ 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 +832,7 @@ 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; @@ -829,17 +843,14 @@ 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; default: abort(); } =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; @@ -865,14 +876,19 @@ static void configure_rtc_host_datetime_offset(const = char *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) { const char *value; =20 + /* Set defaults */ + 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; + value =3D qemu_opt_get(opts, "base"); if (value) { if (!strcmp(value, "utc")) { @@ -885,7 +901,7 @@ 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"); @@ -3035,7 +3051,6 @@ int main(int argc, char **argv, char **envp) error_reportf_err(err, "cannot initialize crypto: "); exit(1); } - rtc_clock =3D QEMU_CLOCK_HOST; =20 QLIST_INIT (&vm_change_state_head); os_setup_early_signal_handling(); @@ -3755,7 +3770,6 @@ int main(int argc, char **argv, char **envp) if (!opts) { exit(1); } - configure_rtc(opts); break; case QEMU_OPTION_tb_size: #ifndef CONFIG_TCG @@ -3973,6 +3987,8 @@ int main(int argc, char **argv, char **envp) exit(EXIT_FAILURE); } =20 + configure_rtc(qemu_find_opts_singleton("rtc")); + machine_class =3D select_machine(); =20 set_memory_options(&ram_slots, &maxram_size, machine_class); --=20 1.8.3.1