linux-kernel - Re: [Qemu-devel] [PATCH 0/7] KVM: MMU: fast write protect

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Date:   Tue, 6 Jun 2017 10:56:55 +0800
From:   Xiao Guangrong <guangrong.xiao@...il.com>
To:     Jay Zhou <jianjay.zhou@...wei.com>, pbonzini@...hat.com,
        mtosatti@...hat.com, avi.kivity@...il.com, rkrcmar@...hat.com
Cc:     Xiao Guangrong <xiaoguangrong@...cent.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        qemu-devel@...gnu.org
Subject: Re: [Qemu-devel] [PATCH 0/7] KVM: MMU: fast write protect



On 06/05/2017 03:36 PM, Jay Zhou wrote:

>>   /* enable ucontrol for s390 */
>>   struct kvm_s390_ucas_mapping {
>> diff --git a/memory.c b/memory.c
>> index 4c95aaf..b836675 100644
>> --- a/memory.c
>> +++ b/memory.c
>> @@ -809,6 +809,13 @@ static void address_space_update_ioeventfds(AddressSpace *as)
>>       flatview_unref(view);
>>   }
>>
>> +static write_protect_all_fn write_func;
> 
> I think there should be a declaration in memory.h,
> 
> diff --git a/include/exec/memory.h b/include/exec/memory.h
> index 7fc3f48..31f3098 100644
> --- a/include/exec/memory.h
> +++ b/include/exec/memory.h
> @@ -1152,6 +1152,9 @@ void memory_global_dirty_log_start(void);
>    */
>   void memory_global_dirty_log_stop(void);
> 
> +typedef void (*write_protect_all_fn)(bool write);
> +void memory_register_write_protect_all(write_protect_all_fn func);
> +
>   void mtree_info(fprintf_function mon_printf, void *f);
> 

Thanks for your suggestion, Jay!

This code just demonstrates how to enable this feature in QEMU, i will
carefully consider it and merger your suggestion when the formal patch
is posted out.