[Qemu-devel] [PATCH][RESEND] Time drift again.

[Qemu-devel] [PATCH][RESEND] Time drift again.

[Gleb Natapov]

Hello,

 After my last patch to fix interrupt coalescing was rejected
on the basis that it is too intrusive we decided to make the
fix much more localized and only fix the problem for RTC time
source. Unfortunately it is impossible to fix the problem entirely
inside RTC code like Andrzej proposed since Windows reads RTC
register C more then once on each time interrupt so it is impossible
to count reliably how many interrupt windows actually handled.
Proposed solution is localized to I386 target and is disabled by
default. To enable it "-rtc-td-hack" flag should be used.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
diff --git a/hw/apic.c b/hw/apic.c
index bad137f..3052843 100644
--- a/hw/apic.c
+++ b/hw/apic.c
@@ -100,6 +100,8 @@ struct IOAPICState {
 static int apic_io_memory;
 static APICState *local_apics[MAX_APICS + 1];
 static int last_apic_id = 0;
+static int apic_irq_delivered;
+
 
 static void apic_init_ipi(APICState *s);
 static void apic_set_irq(APICState *s, int vector_num, int trigger_mode);
@@ -133,6 +135,14 @@ static inline void reset_bit(uint32_t *tab, int index)
     tab[i] &= ~mask;
 }
 
+static inline int get_bit(uint32_t *tab, int index)
+{
+    int i, mask;
+    i = index >> 5;
+    mask = 1 << (index & 0x1f);
+    return !!(tab[i] & mask);
+}
+
 static void apic_local_deliver(CPUState *env, int vector)
 {
     APICState *s = env->apic_state;
@@ -349,8 +359,20 @@ static void apic_update_irq(APICState *s)
     cpu_interrupt(s->cpu_env, CPU_INTERRUPT_HARD);
 }
 
+void apic_reset_irq_delivered(void)
+{
+    apic_irq_delivered = 0;
+}
+
+int apic_get_irq_delivered(void)
+{
+    return apic_irq_delivered;
+}
+
 static void apic_set_irq(APICState *s, int vector_num, int trigger_mode)
 {
+    apic_irq_delivered += !get_bit(s->irr, vector_num);
+
     set_bit(s->irr, vector_num);
     if (trigger_mode)
         set_bit(s->tmr, vector_num);
diff --git a/hw/mc146818rtc.c b/hw/mc146818rtc.c
index faf847d..1c71bda 100644
--- a/hw/mc146818rtc.c
+++ b/hw/mc146818rtc.c
@@ -66,6 +66,10 @@ struct RTCState {
     int64_t next_periodic_time;
     /* second update */
     int64_t next_second_time;
+#ifdef TARGET_I386
+    uint32_t irq_coalesced;
+    uint32_t period;
+#endif
     QEMUTimer *second_timer;
     QEMUTimer *second_timer2;
 };
@@ -103,12 +107,20 @@ static void rtc_timer_update(RTCState *s, int64_t current_time)
             period_code += 7;
         /* period in 32 Khz cycles */
         period = 1 << (period_code - 1);
+#ifdef TARGET_I386
+        if(period != s->period)
+            s->irq_coalesced = (s->irq_coalesced * s->period) / period;
+        s->period = period;
+#endif
         /* compute 32 khz clock */
         cur_clock = muldiv64(current_time, 32768, ticks_per_sec);
         next_irq_clock = (cur_clock & ~(period - 1)) + period;
         s->next_periodic_time = muldiv64(next_irq_clock, ticks_per_sec, 32768) + 1;
         qemu_mod_timer(s->periodic_timer, s->next_periodic_time);
     } else {
+#ifdef TARGET_I386
+        s->irq_coalesced = 0;
+#endif
         qemu_del_timer(s->periodic_timer);
     }
 }
@@ -118,6 +130,12 @@ static void rtc_periodic_timer(void *opaque)
     RTCState *s = opaque;
 
     rtc_timer_update(s, s->next_periodic_time);
+#ifdef TARGET_I386
+    if ((s->cmos_data[RTC_REG_C] & 0xc0) && rtc_td_hack) {
+        s->irq_coalesced++;
+        return;
+    }
+#endif
     s->cmos_data[RTC_REG_C] |= 0xc0;
     rtc_irq_raise(s->irq);
 }
@@ -378,6 +396,15 @@ static uint32_t cmos_ioport_read(void *opaque, uint32_t addr)
         case RTC_REG_C:
             ret = s->cmos_data[s->cmos_index];
             qemu_irq_lower(s->irq);
+#ifdef TARGET_I386
+            if(s->irq_coalesced) {
+                apic_reset_irq_delivered();
+                qemu_irq_raise(s->irq);
+                if (apic_get_irq_delivered())
+                    s->irq_coalesced--;
+                break;
+            }
+#endif
             s->cmos_data[RTC_REG_C] = 0x00;
             break;
         default:
@@ -472,6 +499,28 @@ static int rtc_load(QEMUFile *f, void *opaque, int version_id)
     return 0;
 }
 
+#ifdef TARGET_I386
+static void rtc_save_td(QEMUFile *f, void *opaque)
+{
+    RTCState *s = opaque;
+
+    qemu_put_be32(f, s->irq_coalesced);
+    qemu_put_be32(f, s->period);
+}
+
+static int rtc_load_td(QEMUFile *f, void *opaque, int version_id)
+{
+    RTCState *s = opaque;
+
+    if (version_id != 1)
+        return -EINVAL;
+
+    s->irq_coalesced = qemu_get_be32(f);
+    s->period = qemu_get_be32(f);
+    return 0;
+}
+#endif
+
 RTCState *rtc_init(int base, qemu_irq irq)
 {
     RTCState *s;
@@ -502,6 +551,10 @@ RTCState *rtc_init(int base, qemu_irq irq)
     register_ioport_read(base, 2, 1, cmos_ioport_read, s);
 
     register_savevm("mc146818rtc", base, 1, rtc_save, rtc_load, s);
+#ifdef TARGET_I386
+    if (rtc_td_hack)
+        register_savevm("mc146818rtc-td", base, 1, rtc_save_td, rtc_load_td, s);
+#endif
     return s;
 }
 
@@ -608,5 +661,9 @@ RTCState *rtc_mm_init(target_phys_addr_t base, int it_shift, qemu_irq irq)
     cpu_register_physical_memory(base, 2 << it_shift, io_memory);
 
     register_savevm("mc146818rtc", base, 1, rtc_save, rtc_load, s);
+#ifdef TARGET_I386
+    if (rtc_td_hack)
+        register_savevm("mc146818rtc-td", base, 1, rtc_save_td, rtc_load_td, s);
+#endif
     return s;
 }
diff --git a/hw/pc.h b/hw/pc.h
index a60bddf..5dc7709 100644
--- a/hw/pc.h
+++ b/hw/pc.h
@@ -46,6 +46,8 @@ void apic_deliver_pic_intr(CPUState *env, int level);
 int apic_get_interrupt(CPUState *env);
 IOAPICState *ioapic_init(void);
 void ioapic_set_irq(void *opaque, int vector, int level);
+void apic_reset_irq_delivered(void);
+int apic_get_irq_delivered(void);
 
 /* i8254.c */
 
diff --git a/qemu-doc.texi b/qemu-doc.texi
index 5a12dc9..f61ae34 100644
--- a/qemu-doc.texi
+++ b/qemu-doc.texi
@@ -420,6 +420,11 @@ Use it when installing Windows 2000 to avoid a disk full bug. After
 Windows 2000 is installed, you no longer need this option (this option
 slows down the IDE transfers).
 
+@item -rtc-td-hack
+Use it if you experience time drift problem in Windows with ACPI HAL.
+This option will try to figure out how many timer interrupts were not
+processed by the Windows guest and will re-inject them.
+
 @item -option-rom @var{file}
 Load the contents of @var{file} as an option ROM.
 This option is useful to load things like EtherBoot.
diff --git a/sysemu.h b/sysemu.h
index 47c1fea..a9e156c 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -90,6 +90,7 @@ extern int graphic_depth;
 extern int nographic;
 extern const char *keyboard_layout;
 extern int win2k_install_hack;
+extern int rtc_td_hack;
 extern int alt_grab;
 extern int usb_enabled;
 extern int smp_cpus;
diff --git a/vl.c b/vl.c
index e29072b..244d1c3 100644
--- a/vl.c
+++ b/vl.c
@@ -211,6 +211,7 @@ CharDriverState *serial_hds[MAX_SERIAL_PORTS];
 CharDriverState *parallel_hds[MAX_PARALLEL_PORTS];
 #ifdef TARGET_I386
 int win2k_install_hack = 0;
+int rtc_td_hack = 0;
 #endif
 int usb_enabled = 0;
 int smp_cpus = 1;
@@ -3877,6 +3878,7 @@ static void help(int exitcode)
            "-full-screen    start in full screen\n"
 #ifdef TARGET_I386
            "-win2k-hack     use it when installing Windows 2000 to avoid a disk full bug\n"
+           "-rtc-td-hack    use it to fix time drift in Windows ACPI HAL\n"
 #endif
            "-usb            enable the USB driver (will be the default soon)\n"
            "-usbdevice name add the host or guest USB device 'name'\n"
@@ -4072,6 +4074,7 @@ enum {
     QEMU_OPTION_kernel_kqemu,
     QEMU_OPTION_enable_kvm,
     QEMU_OPTION_win2k_hack,
+    QEMU_OPTION_rtc_td_hack,
     QEMU_OPTION_usb,
     QEMU_OPTION_usbdevice,
     QEMU_OPTION_smp,
@@ -4180,6 +4183,7 @@ static const QEMUOption qemu_options[] = {
 #endif
     { "pidfile", HAS_ARG, QEMU_OPTION_pidfile },
     { "win2k-hack", 0, QEMU_OPTION_win2k_hack },
+    { "rtc-td-hack", 0, QEMU_OPTION_rtc_td_hack },
     { "usbdevice", HAS_ARG, QEMU_OPTION_usbdevice },
     { "smp", HAS_ARG, QEMU_OPTION_smp },
     { "vnc", HAS_ARG, QEMU_OPTION_vnc },
@@ -4993,6 +4997,9 @@ int main(int argc, char **argv, char **envp)
             case QEMU_OPTION_win2k_hack:
                 win2k_install_hack = 1;
                 break;
+            case QEMU_OPTION_rtc_td_hack:
+                rtc_td_hack = 1;
+                break;
 #endif
 #ifdef USE_KQEMU
             case QEMU_OPTION_no_kqemu:
--
			Gleb.

Re: [Qemu-devel] [PATCH][RESEND] Time drift again.

[Jamie Lokier]

Gleb Natapov wrote:
>  After my last patch to fix interrupt coalescing was rejected
> on the basis that it is too intrusive we decided to make the
> fix much more localized and only fix the problem for RTC time
> source. Unfortunately it is impossible to fix the problem entirely
> inside RTC code like Andrzej proposed since Windows reads RTC
> register C more then once on each time interrupt so it is impossible
> to count reliably how many interrupt windows actually handled.
> Proposed solution is localized to I386 target and is disabled by
> default. To enable it "-rtc-td-hack" flag should be used.

I truly don't understand why the time correction is done by arcane
guest-specific details like counting register reads, making interrupts
behave different from real hardware, and only correcting guests which
use particular clock sources - instead of simply warping virtual time
(in all the places it's used) which might actually work on all targets
and all guest OSes.

I don't remember anybody responding to that suggestion.
Was it a silly one?

-- Jamie

Re: [Qemu-devel] [PATCH][RESEND] Time drift again.

[Avi Kivity]

Jamie Lokier wrote:
> Gleb Natapov wrote:
>   
>>  After my last patch to fix interrupt coalescing was rejected
>> on the basis that it is too intrusive we decided to make the
>> fix much more localized and only fix the problem for RTC time
>> source. Unfortunately it is impossible to fix the problem entirely
>> inside RTC code like Andrzej proposed since Windows reads RTC
>> register C more then once on each time interrupt so it is impossible
>> to count reliably how many interrupt windows actually handled.
>> Proposed solution is localized to I386 target and is disabled by
>> default. To enable it "-rtc-td-hack" flag should be used.
>>     
>
> I truly don't understand why the time correction is done by arcane
> guest-specific details like counting register reads, making interrupts
> behave different from real hardware, and only correcting guests which
> use particular clock sources - instead of simply warping virtual time
> (in all the places it's used) which might actually work on all targets
> and all guest OSes.
>
> I don't remember anybody responding to that suggestion.
> Was it a silly one?
>   

Maybe it's silly, but I don't even understand it.

What do you mean by "warping virtual time"?  I have a hard time with 
these words even when used singly.

-- 
error compiling committee.c: too many arguments to function

Re: [Qemu-devel] [PATCH][RESEND] Time drift again.

[Marcelo Tosatti]

On Wed, Jan 14, 2009 at 05:02:23PM +0000, Jamie Lokier wrote:
> Gleb Natapov wrote:
> >  After my last patch to fix interrupt coalescing was rejected
> > on the basis that it is too intrusive we decided to make the
> > fix much more localized and only fix the problem for RTC time
> > source. Unfortunately it is impossible to fix the problem entirely
> > inside RTC code like Andrzej proposed since Windows reads RTC
> > register C more then once on each time interrupt so it is impossible
> > to count reliably how many interrupt windows actually handled.
> > Proposed solution is localized to I386 target and is disabled by
> > default. To enable it "-rtc-td-hack" flag should be used.
> 
> I truly don't understand why the time correction is done by arcane
> guest-specific details like counting register reads, making interrupts
> behave different from real hardware, and only correcting guests which
> use particular clock sources - instead of simply warping virtual time
> (in all the places it's used) which might actually work on all targets
> and all guest OSes.
> 
> I don't remember anybody responding to that suggestion.
> Was it a silly one?

Not, it was not silly. The problem is every guest handles timekeeping
differently (even different clocks in the same guest behave
differently). Xen and ESX implement virtual time, but it can be
problematic in some scenarios.

http://lists.xensource.com/archives/html/xen-devel/2008-02/msg00036.html

Re: [Qemu-devel] [PATCH][RESEND] Time drift again.

[Anthony Liguori]

Gleb Natapov wrote:
> Hello,
>
>  After my last patch to fix interrupt coalescing was rejected
> on the basis that it is too intrusive we decided to make the
> fix much more localized and only fix the problem for RTC time
> source. Unfortunately it is impossible to fix the problem entirely
> inside RTC code like Andrzej proposed since Windows reads RTC
> register C more then once on each time interrupt so it is impossible
> to count reliably how many interrupt windows actually handled.
> Proposed solution is localized to I386 target and is disabled by
> default. To enable it "-rtc-td-hack" flag should be used.
>
> Signed-off-by: Gleb Natapov <gleb@redhat.com>
>   

Applied.  Thanks for all your work on this.  I know this has gone 
through a lot of iterations to come up with something that made everyone 
happy and the persistence is appreciated :-)

Regards,

Anthony Liguori

> diff --git a/hw/apic.c b/hw/apic.c
> index bad137f..3052843 100644
> --- a/hw/apic.c
> +++ b/hw/apic.c
> @@ -100,6 +100,8 @@ struct IOAPICState {
>  static int apic_io_memory;
>  static APICState *local_apics[MAX_APICS + 1];
>  static int last_apic_id = 0;
> +static int apic_irq_delivered;
> +
>  
>  static void apic_init_ipi(APICState *s);
>  static void apic_set_irq(APICState *s, int vector_num, int trigger_mode);
> @@ -133,6 +135,14 @@ static inline void reset_bit(uint32_t *tab, int index)
>      tab[i] &= ~mask;
>  }
>  
> +static inline int get_bit(uint32_t *tab, int index)
> +{
> +    int i, mask;
> +    i = index >> 5;
> +    mask = 1 << (index & 0x1f);
> +    return !!(tab[i] & mask);
> +}
> +
>  static void apic_local_deliver(CPUState *env, int vector)
>  {
>      APICState *s = env->apic_state;
> @@ -349,8 +359,20 @@ static void apic_update_irq(APICState *s)
>      cpu_interrupt(s->cpu_env, CPU_INTERRUPT_HARD);
>  }
>  
> +void apic_reset_irq_delivered(void)
> +{
> +    apic_irq_delivered = 0;
> +}
> +
> +int apic_get_irq_delivered(void)
> +{
> +    return apic_irq_delivered;
> +}
> +
>  static void apic_set_irq(APICState *s, int vector_num, int trigger_mode)
>  {
> +    apic_irq_delivered += !get_bit(s->irr, vector_num);
> +
>      set_bit(s->irr, vector_num);
>      if (trigger_mode)
>          set_bit(s->tmr, vector_num);
> diff --git a/hw/mc146818rtc.c b/hw/mc146818rtc.c
> index faf847d..1c71bda 100644
> --- a/hw/mc146818rtc.c
> +++ b/hw/mc146818rtc.c
> @@ -66,6 +66,10 @@ struct RTCState {
>      int64_t next_periodic_time;
>      /* second update */
>      int64_t next_second_time;
> +#ifdef TARGET_I386
> +    uint32_t irq_coalesced;
> +    uint32_t period;
> +#endif
>      QEMUTimer *second_timer;
>      QEMUTimer *second_timer2;
>  };
> @@ -103,12 +107,20 @@ static void rtc_timer_update(RTCState *s, int64_t current_time)
>              period_code += 7;
>          /* period in 32 Khz cycles */
>          period = 1 << (period_code - 1);
> +#ifdef TARGET_I386
> +        if(period != s->period)
> +            s->irq_coalesced = (s->irq_coalesced * s->period) / period;
> +        s->period = period;
> +#endif
>          /* compute 32 khz clock */
>          cur_clock = muldiv64(current_time, 32768, ticks_per_sec);
>          next_irq_clock = (cur_clock & ~(period - 1)) + period;
>          s->next_periodic_time = muldiv64(next_irq_clock, ticks_per_sec, 32768) + 1;
>          qemu_mod_timer(s->periodic_timer, s->next_periodic_time);
>      } else {
> +#ifdef TARGET_I386
> +        s->irq_coalesced = 0;
> +#endif
>          qemu_del_timer(s->periodic_timer);
>      }
>  }
> @@ -118,6 +130,12 @@ static void rtc_periodic_timer(void *opaque)
>      RTCState *s = opaque;
>  
>      rtc_timer_update(s, s->next_periodic_time);
> +#ifdef TARGET_I386
> +    if ((s->cmos_data[RTC_REG_C] & 0xc0) && rtc_td_hack) {
> +        s->irq_coalesced++;
> +        return;
> +    }
> +#endif
>      s->cmos_data[RTC_REG_C] |= 0xc0;
>      rtc_irq_raise(s->irq);
>  }
> @@ -378,6 +396,15 @@ static uint32_t cmos_ioport_read(void *opaque, uint32_t addr)
>          case RTC_REG_C:
>              ret = s->cmos_data[s->cmos_index];
>              qemu_irq_lower(s->irq);
> +#ifdef TARGET_I386
> +            if(s->irq_coalesced) {
> +                apic_reset_irq_delivered();
> +                qemu_irq_raise(s->irq);
> +                if (apic_get_irq_delivered())
> +                    s->irq_coalesced--;
> +                break;
> +            }
> +#endif
>              s->cmos_data[RTC_REG_C] = 0x00;
>              break;
>          default:
> @@ -472,6 +499,28 @@ static int rtc_load(QEMUFile *f, void *opaque, int version_id)
>      return 0;
>  }
>  
> +#ifdef TARGET_I386
> +static void rtc_save_td(QEMUFile *f, void *opaque)
> +{
> +    RTCState *s = opaque;
> +
> +    qemu_put_be32(f, s->irq_coalesced);
> +    qemu_put_be32(f, s->period);
> +}
> +
> +static int rtc_load_td(QEMUFile *f, void *opaque, int version_id)
> +{
> +    RTCState *s = opaque;
> +
> +    if (version_id != 1)
> +        return -EINVAL;
> +
> +    s->irq_coalesced = qemu_get_be32(f);
> +    s->period = qemu_get_be32(f);
> +    return 0;
> +}
> +#endif
> +
>  RTCState *rtc_init(int base, qemu_irq irq)
>  {
>      RTCState *s;
> @@ -502,6 +551,10 @@ RTCState *rtc_init(int base, qemu_irq irq)
>      register_ioport_read(base, 2, 1, cmos_ioport_read, s);
>  
>      register_savevm("mc146818rtc", base, 1, rtc_save, rtc_load, s);
> +#ifdef TARGET_I386
> +    if (rtc_td_hack)
> +        register_savevm("mc146818rtc-td", base, 1, rtc_save_td, rtc_load_td, s);
> +#endif
>      return s;
>  }
>  
> @@ -608,5 +661,9 @@ RTCState *rtc_mm_init(target_phys_addr_t base, int it_shift, qemu_irq irq)
>      cpu_register_physical_memory(base, 2 << it_shift, io_memory);
>  
>      register_savevm("mc146818rtc", base, 1, rtc_save, rtc_load, s);
> +#ifdef TARGET_I386
> +    if (rtc_td_hack)
> +        register_savevm("mc146818rtc-td", base, 1, rtc_save_td, rtc_load_td, s);
> +#endif
>      return s;
>  }
> diff --git a/hw/pc.h b/hw/pc.h
> index a60bddf..5dc7709 100644
> --- a/hw/pc.h
> +++ b/hw/pc.h
> @@ -46,6 +46,8 @@ void apic_deliver_pic_intr(CPUState *env, int level);
>  int apic_get_interrupt(CPUState *env);
>  IOAPICState *ioapic_init(void);
>  void ioapic_set_irq(void *opaque, int vector, int level);
> +void apic_reset_irq_delivered(void);
> +int apic_get_irq_delivered(void);
>  
>  /* i8254.c */
>  
> diff --git a/qemu-doc.texi b/qemu-doc.texi
> index 5a12dc9..f61ae34 100644
> --- a/qemu-doc.texi
> +++ b/qemu-doc.texi
> @@ -420,6 +420,11 @@ Use it when installing Windows 2000 to avoid a disk full bug. After
>  Windows 2000 is installed, you no longer need this option (this option
>  slows down the IDE transfers).
>  
> +@item -rtc-td-hack
> +Use it if you experience time drift problem in Windows with ACPI HAL.
> +This option will try to figure out how many timer interrupts were not
> +processed by the Windows guest and will re-inject them.
> +
>  @item -option-rom @var{file}
>  Load the contents of @var{file} as an option ROM.
>  This option is useful to load things like EtherBoot.
> diff --git a/sysemu.h b/sysemu.h
> index 47c1fea..a9e156c 100644
> --- a/sysemu.h
> +++ b/sysemu.h
> @@ -90,6 +90,7 @@ extern int graphic_depth;
>  extern int nographic;
>  extern const char *keyboard_layout;
>  extern int win2k_install_hack;
> +extern int rtc_td_hack;
>  extern int alt_grab;
>  extern int usb_enabled;
>  extern int smp_cpus;
> diff --git a/vl.c b/vl.c
> index e29072b..244d1c3 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -211,6 +211,7 @@ CharDriverState *serial_hds[MAX_SERIAL_PORTS];
>  CharDriverState *parallel_hds[MAX_PARALLEL_PORTS];
>  #ifdef TARGET_I386
>  int win2k_install_hack = 0;
> +int rtc_td_hack = 0;
>  #endif
>  int usb_enabled = 0;
>  int smp_cpus = 1;
> @@ -3877,6 +3878,7 @@ static void help(int exitcode)
>             "-full-screen    start in full screen\n"
>  #ifdef TARGET_I386
>             "-win2k-hack     use it when installing Windows 2000 to avoid a disk full bug\n"
> +           "-rtc-td-hack    use it to fix time drift in Windows ACPI HAL\n"
>  #endif
>             "-usb            enable the USB driver (will be the default soon)\n"
>             "-usbdevice name add the host or guest USB device 'name'\n"
> @@ -4072,6 +4074,7 @@ enum {
>      QEMU_OPTION_kernel_kqemu,
>      QEMU_OPTION_enable_kvm,
>      QEMU_OPTION_win2k_hack,
> +    QEMU_OPTION_rtc_td_hack,
>      QEMU_OPTION_usb,
>      QEMU_OPTION_usbdevice,
>      QEMU_OPTION_smp,
> @@ -4180,6 +4183,7 @@ static const QEMUOption qemu_options[] = {
>  #endif
>      { "pidfile", HAS_ARG, QEMU_OPTION_pidfile },
>      { "win2k-hack", 0, QEMU_OPTION_win2k_hack },
> +    { "rtc-td-hack", 0, QEMU_OPTION_rtc_td_hack },
>      { "usbdevice", HAS_ARG, QEMU_OPTION_usbdevice },
>      { "smp", HAS_ARG, QEMU_OPTION_smp },
>      { "vnc", HAS_ARG, QEMU_OPTION_vnc },
> @@ -4993,6 +4997,9 @@ int main(int argc, char **argv, char **envp)
>              case QEMU_OPTION_win2k_hack:
>                  win2k_install_hack = 1;
>                  break;
> +            case QEMU_OPTION_rtc_td_hack:
> +                rtc_td_hack = 1;
> +                break;
>  #endif
>  #ifdef USE_KQEMU
>              case QEMU_OPTION_no_kqemu:
> --
> 			Gleb.
>
>
>