linux-kernel - Re: [PATCH v5 11/12] KVM: x86: introduce set_mmio_exit

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Date:	Sat, 11 Aug 2012 11:13:10 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
CC:	Avi Kivity <avi@...hat.com>, LKML <linux-kernel@...r.kernel.org>,
	KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH v5 11/12] KVM: x86: introduce set_mmio_exit_info

On 08/11/2012 02:03 AM, Marcelo Tosatti wrote:

>>  int emulator_read_write(struct x86_emulate_ctxt *ctxt, unsigned long addr,
>>  			void *val, unsigned int bytes,
>>  			struct x86_exception *exception,
>> @@ -3870,14 +3881,10 @@ int emulator_read_write(struct x86_emulate_ctxt *ctxt, unsigned long addr,
>>  		return rc;
>>
>>  	gpa = vcpu->mmio_fragments[0].gpa;
>> -
>>  	vcpu->mmio_needed = 1;
>>  	vcpu->mmio_cur_fragment = 0;
>>
>> -	vcpu->run->mmio.len = vcpu->mmio_fragments[0].len;
>> -	vcpu->run->mmio.is_write = vcpu->mmio_is_write = ops->write;
>> -	vcpu->run->exit_reason = KVM_EXIT_MMIO;
>> -	vcpu->run->mmio.phys_addr = gpa;
>> +	set_mmio_exit_info(vcpu, &vcpu->mmio_fragments[0], ops->write);
>>
>>  	return ops->read_write_exit_mmio(vcpu, gpa, val, bytes);
>>  }
>> @@ -5486,7 +5493,6 @@ static int __vcpu_run(struct kvm_vcpu *vcpu)
>>   */
>>  static int complete_mmio(struct kvm_vcpu *vcpu)
>>  {
>> -	struct kvm_run *run = vcpu->run;
>>  	struct kvm_mmio_fragment *frag;
>>  	int r;
>>
>> @@ -5497,7 +5503,7 @@ static int complete_mmio(struct kvm_vcpu *vcpu)
>>  		/* Complete previous fragment */
>>  		frag = &vcpu->mmio_fragments[vcpu->mmio_cur_fragment++];
>>  		if (!vcpu->mmio_is_write)
>> -			memcpy(frag->data, run->mmio.data, frag->len);
>> +			memcpy(frag->data, vcpu->run->mmio.data, frag->len);
>>  		if (vcpu->mmio_cur_fragment == vcpu->mmio_nr_fragments) {
>>  			vcpu->mmio_needed = 0;
>>  			if (vcpu->mmio_is_write)
>> @@ -5507,12 +5513,7 @@ static int complete_mmio(struct kvm_vcpu *vcpu)
>>  		}
>>  		/* Initiate next fragment */
>>  		++frag;
>> -		run->exit_reason = KVM_EXIT_MMIO;
>> -		run->mmio.phys_addr = frag->gpa;
>> -		if (vcpu->mmio_is_write)
>> -			memcpy(run->mmio.data, frag->data, frag->len);
>> -		run->mmio.len = frag->len;
>> -		run->mmio.is_write = vcpu->mmio_is_write;
>> +		set_mmio_exit_info(vcpu, frag, vcpu->mmio_is_write);
>>  		return 0;
>>
>>  	}
>> -- 
>> 1.7.7.6
> 
> IMO having a function is unnecessary (it makes it harder the code).

Okay, i will drop this patch.


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