Re: [Qemu-devel] Re: [PATCH 04/21] wrap cache flushing functions into accel drivers

["Glauber Costa" <glommer@gmail.com>]

On Wed, Oct 15, 2008 at 6:23 PM, Anthony Liguori <aliguori@us.ibm.com> wrote:
> Glauber Costa wrote:
>>
>> From: Glauber Costa <gcosta@redhat.com>
>>
>> Yet another accel field: cache flushing functions
>> Signed-off-by: Glauber Costa <glommer@redhat.com>
>> ---
>>  accel.c |    2 ++
>>  accel.h |   11 +++++++++++
>>  exec.c  |   15 +++++++--------
>>  kqemu.c |   15 +++++++++------
>>  4 files changed, 29 insertions(+), 14 deletions(-)
>>
>> diff --git a/accel.c b/accel.c
>> index 3a17dc5..6776244 100644
>> --- a/accel.c
>> +++ b/accel.c
>> @@ -14,5 +14,7 @@ int _accel_nop(void)
>>  QEMUAccel noaccel = {
>>     .cpu_interrupt = accel_nop,
>>     .init_env = accel_nop,
>> +    .flush_cache = accel_nop,
>> +    .flush_page = accel_nop,
>>  };
>>
>> diff --git a/accel.h b/accel.h
>> index 0d916dc..935cfef 100644
>> --- a/accel.h
>> +++ b/accel.h
>> @@ -4,6 +4,8 @@
>>  typedef struct QEMUAccel {
>>     void (*cpu_interrupt)(CPUState *env);
>>     void (*init_env)(CPUState *env);
>> +    void (*flush_cache)(CPUState *env, int global);
>> +    void (*flush_page)(CPUState *env, target_ulong addr);
>>  } QEMUAccel;
>>
>>  extern QEMUAccel *current_accel;
>> @@ -24,4 +26,13 @@ static inline void accel_init_env(CPUState *env)
>>     current_accel->init_env(env);
>>  }
>>
>> +static inline void accel_flush_cache(CPUState *env, int global)
>> +{
>> +    current_accel->flush_cache(env, global);
>> +}
>> +
>> +static inline void accel_flush_page(CPUState *env, target_ulong addr)
>> +{
>> +    current_accel->flush_page(env, addr);
>> +}
>>  #endif
>> diff --git a/exec.c b/exec.c
>> index 21253cc..c761f4a 100644
>> --- a/exec.c
>> +++ b/exec.c
>> @@ -1684,10 +1684,10 @@ void tlb_flush(CPUState *env, int flush_global)
>>
>>     memset (env->tb_jmp_cache, 0, TB_JMP_CACHE_SIZE * sizeof (void *));
>>
>> -#ifdef USE_KQEMU
>> -    if (env->kqemu_enabled) {
>> -        kqemu_flush(env, flush_global);
>> -    }
>> +    accel_flush_cache(env, flush_global);
>> +
>> +#if !defined(CONFIG_SOFTMMU)
>> +    munmap((void *)MMAP_AREA_START, MMAP_AREA_END - MMAP_AREA_START);
>>
>
> Where did this come from??  I understand the rather simple conversion of
> kqemu_flush to accel_flush_cache but it's not at all clear where this munmap
> came from.

Ancient versions of the patch. This code was removed and I didn't notice it.

thanks

>
>>  #endif
>>     tlb_flush_count++;
>>  }
>> @@ -1730,10 +1730,9 @@ void tlb_flush_page(CPUState *env, target_ulong
>> addr)
>>
>>     tlb_flush_jmp_cache(env, addr);
>>
>> -#ifdef USE_KQEMU
>> -    if (env->kqemu_enabled) {
>> -        kqemu_flush_page(env, addr);
>> -    }
>> +    accel_flush_page(env, addr);
>> +#if !defined(CONFIG_SOFTMMU)
>> +    if (addr < MMAP_AREA_END)
>>
>
> And what is this if() being added for?
>
>
> Regards,
>
> Anthony Liguori
>
>
>



-- 
Glauber  Costa.
"Free as in Freedom"
http://glommer.net

"The less confident you are, the more serious you have to act."