[Qemu-devel] [PATCH] cpu: init vmstate for ticks and clock offset

[Qemu-devel] [PATCH] cpu: init vmstate for ticks and clock offset

[Pavel Dovgalyuk]

Ticks and clock offset used by CPU timers have to be saved in vmstate.
But vmstate for these fields registered only in icount mode.
Missing registration leads to breaking the continuity when vmstate is loaded.
This patch introduces new initialization function which fixes this.

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
---
 cpus.c                |    8 ++++++--
 include/qemu-common.h |    2 ++
 vl.c                  |    1 +
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/cpus.c b/cpus.c
index 2b5c0bd..c07826d 100644
--- a/cpus.c
+++ b/cpus.c
@@ -492,13 +492,17 @@ static const VMStateDescription vmstate_timers = {
     }
 };
 
+void cpu_ticks_init(void)
+{
+    seqlock_init(&timers_state.vm_clock_seqlock, NULL);
+    vmstate_register(NULL, 0, &vmstate_timers, &timers_state);
+}
+
 void configure_icount(QemuOpts *opts, Error **errp)
 {
     const char *option;
     char *rem_str = NULL;
 
-    seqlock_init(&timers_state.vm_clock_seqlock, NULL);
-    vmstate_register(NULL, 0, &vmstate_timers, &timers_state);
     option = qemu_opt_get(opts, "shift");
     if (!option) {
         if (qemu_opt_get(opts, "align") != NULL) {
diff --git a/include/qemu-common.h b/include/qemu-common.h
index bcf7a6a..dcb57ab 100644
--- a/include/qemu-common.h
+++ b/include/qemu-common.h
@@ -105,6 +105,8 @@ static inline char *realpath(const char *path, char *resolved_path)
 }
 #endif
 
+void cpu_ticks_init(void);
+
 /* icount */
 void configure_icount(QemuOpts *opts, Error **errp);
 extern int use_icount;
diff --git a/vl.c b/vl.c
index b796c67..9241e2d 100644
--- a/vl.c
+++ b/vl.c
@@ -4330,6 +4330,7 @@ int main(int argc, char **argv, char **envp)
     qemu_spice_init();
 #endif
 
+    cpu_ticks_init();
     if (icount_opts) {
         if (kvm_enabled() || xen_enabled()) {
             fprintf(stderr, "-icount is not allowed with kvm or xen\n");

Re: [Qemu-devel] [PATCH] cpu: init vmstate for ticks and clock offset

[Paolo Bonzini]

Il 01/09/2014 07:34, Pavel Dovgalyuk ha scritto:
> Ticks and clock offset used by CPU timers have to be saved in vmstate.
> But vmstate for these fields registered only in icount mode.
> Missing registration leads to breaking the continuity when vmstate is loaded.
> This patch introduces new initialization function which fixes this.
> 
> Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
> ---
>  cpus.c                |    8 ++++++--
>  include/qemu-common.h |    2 ++
>  vl.c                  |    1 +
>  3 files changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/cpus.c b/cpus.c
> index 2b5c0bd..c07826d 100644
> --- a/cpus.c
> +++ b/cpus.c
> @@ -492,13 +492,17 @@ static const VMStateDescription vmstate_timers = {
>      }
>  };
>  
> +void cpu_ticks_init(void)
> +{
> +    seqlock_init(&timers_state.vm_clock_seqlock, NULL);
> +    vmstate_register(NULL, 0, &vmstate_timers, &timers_state);
> +}
> +
>  void configure_icount(QemuOpts *opts, Error **errp)
>  {
>      const char *option;
>      char *rem_str = NULL;
>  
> -    seqlock_init(&timers_state.vm_clock_seqlock, NULL);
> -    vmstate_register(NULL, 0, &vmstate_timers, &timers_state);
>      option = qemu_opt_get(opts, "shift");
>      if (!option) {
>          if (qemu_opt_get(opts, "align") != NULL) {
> diff --git a/include/qemu-common.h b/include/qemu-common.h
> index bcf7a6a..dcb57ab 100644
> --- a/include/qemu-common.h
> +++ b/include/qemu-common.h
> @@ -105,6 +105,8 @@ static inline char *realpath(const char *path, char *resolved_path)
>  }
>  #endif
>  
> +void cpu_ticks_init(void);
> +
>  /* icount */
>  void configure_icount(QemuOpts *opts, Error **errp);
>  extern int use_icount;
> diff --git a/vl.c b/vl.c
> index b796c67..9241e2d 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -4330,6 +4330,7 @@ int main(int argc, char **argv, char **envp)
>      qemu_spice_init();
>  #endif
>  
> +    cpu_ticks_init();
>      if (icount_opts) {
>          if (kvm_enabled() || xen_enabled()) {
>              fprintf(stderr, "-icount is not allowed with kvm or xen\n");
> 
> 
> 

Thanks, will send a pull request for this ASAP.

Paolo