mc146818rtc: add rtc-reset-reinjection QMP command

PATCH Superseded Marcelo Tosatti 2 participants 4 messages Jun 17, 2014 – Jun 22, 2014

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Marcelo Tosatti

author

2014-06-17 15:48 UTC #0 lore raw

PATCH v2 1/1 mc146818rtc: add rtc-reset-reinjection QMP command

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 <[email protected]>

hw/timer/mc146818rtc.c +18 -0

index df54546..1782c4e 100644
@@ -26,6 +26,7 @@
 #include "sysemu/sysemu.h"
 #include "hw/timer/mc146818rtc.h"
 #include "qapi/visitor.h"
+#include "qmp-commands.h"
 
 #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;
 
 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;
 }
 
+static QLIST_HEAD(, RTCState) rtc_devices =
+    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 = 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;
 }

qapi-schema.json +12 -0

index 7bc33ea..a4e2c21 100644
@@ -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' }

qmp-commands.hx +23 -0

index d8aa4ed..dc43789 100644
@@ -3572,3 +3572,26 @@ Example:
                    } } ] }
 
 EQMP
+
+#if defined (TARGET_I386)
+    {
+        .name       = "rtc-reset-reinjection",
+        .args_type  = "",
+        .mhandler.cmd_new = 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

Michael S. Tsirkin

2014-06-17 16:32 UTC #1 lore raw

Quoted 9 lines · Marcelo Tosatti

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 <[email protected]>

Thanks, I'll apply this on my tree, though I don't want to redo the pull request so it'll be in the next one. Seems small enough to be ok after soft freeze.

Quoted 75 lines

hw/timer/mc146818rtc.c +18 -0

index df54546..1782c4e 100644
@@ -26,6 +26,7 @@
 #include "sysemu/sysemu.h"
 #include "hw/timer/mc146818rtc.h"
 #include "qapi/visitor.h"
+#include "qmp-commands.h"
 
 #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;
 
 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;
 }
 
+static QLIST_HEAD(, RTCState) rtc_devices =
+    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 = 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;
 }

qapi-schema.json +12 -0

index 7bc33ea..a4e2c21 100644
@@ -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' }

qmp-commands.hx +0 -0

index d8aa4ed..dc43789 100644

qmp-commands.hx Example: · line 3576

Quoted 5 lines

qmp-commands.hx +2 -0

@@ -3572,3 +3572,26 @@ Example:
                    } } ] }
 
 EQMP
+
+#if defined (TARGET_I386)

Pls don't put space before (). I fixed it up.

Quoted 21 lines

qmp-commands.hx +21 -0

+    {
+        .name       = "rtc-reset-reinjection",
+        .args_type  = "",
+        .mhandler.cmd_new = 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

Michael S. Tsirkin

2014-06-17 16:48 UTC #2 lore raw

In reply to Marcelo Tosatti

Quoted 9 lines · Marcelo Tosatti

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 <[email protected]>

Fails build for non x86 target:

LINK arm-softmmu/qemu-system-arm
../qmp-marshal.o: In function `qmp_marshal_input_rtc_reset_reinjection':
/scm/qemu/qmp-marshal.c:5059: undefined reference to `qmp_rtc_reset_reinjection'
collect2: error: ld returned 1 exit status
make[1]: *** [qemu-system-arm] Error 1
make: *** [subdir-arm-softmmu] Error 2

Quoted 101 lines

hw/timer/mc146818rtc.c +18 -0

index df54546..1782c4e 100644
@@ -26,6 +26,7 @@
 #include "sysemu/sysemu.h"
 #include "hw/timer/mc146818rtc.h"
 #include "qapi/visitor.h"
+#include "qmp-commands.h"
 
 #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;
 
 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;
 }
 
+static QLIST_HEAD(, RTCState) rtc_devices =
+    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 = 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;
 }

qapi-schema.json +12 -0

index 7bc33ea..a4e2c21 100644
@@ -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' }

qmp-commands.hx +23 -0

index d8aa4ed..dc43789 100644
@@ -3572,3 +3572,26 @@ Example:
                    } } ] }
 
 EQMP
+
+#if defined (TARGET_I386)
+    {
+        .name       = "rtc-reset-reinjection",
+        .args_type  = "",
+        .mhandler.cmd_new = 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

Michael S. Tsirkin

2014-06-22 10:54 UTC #3 lore raw

Quoted 13 lines · Michael S. Tsirkin

Quoted 9 lines · Marcelo Tosatti
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 <[email protected]>
Fails build for non x86 target:

Quoted 7 lines

LINK arm-softmmu/qemu-system-arm
../qmp-marshal.o: In function `qmp_marshal_input_rtc_reset_reinjection':
/scm/qemu/qmp-marshal.c:5059: undefined reference to `qmp_rtc_reset_reinjection'
collect2: error: ld returned 1 exit status
make[1]: *** [qemu-system-arm] Error 1
make: *** [subdir-arm-softmmu] Error 2

Ping.
Do you plan to fix and re-post the patch?

Quoted 102 lines

hw/timer/mc146818rtc.c +18 -0

index df54546..1782c4e 100644
@@ -26,6 +26,7 @@
 #include "sysemu/sysemu.h"
 #include "hw/timer/mc146818rtc.h"
 #include "qapi/visitor.h"
+#include "qmp-commands.h"
 
 #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;
 
 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;
 }
 
+static QLIST_HEAD(, RTCState) rtc_devices =
+    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 = 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;
 }

qapi-schema.json +12 -0

index 7bc33ea..a4e2c21 100644
@@ -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' }

qmp-commands.hx +23 -0

index d8aa4ed..dc43789 100644
@@ -3572,3 +3572,26 @@ Example:
                    } } ] }
 
 EQMP
+
+#if defined (TARGET_I386)
+    {
+        .name       = "rtc-reset-reinjection",
+        .args_type  = "",
+        .mhandler.cmd_new = 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