linux-kernel - Re: [PATCH v2 3/4] KVM: X86: Migration is supported

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Message-ID: <56443A67.4070208@huawei.com>
Date:	Thu, 12 Nov 2015 15:06:15 +0800
From:	Jian Zhou <jianjay.zhou@...wei.com>
To:	Paolo Bonzini <pbonzini@...hat.com>, <kvm@...r.kernel.org>,
	<gleb@...nel.org>, <tglx@...utronix.de>, <mingo@...hat.com>,
	<hpa@...or.com>, <x86@...nel.org>, <linux-kernel@...r.kernel.org>
CC:	<herongguang.he@...wei.com>, <zhang.zhanghailiang@...wei.com>,
	<weidong.huang@...wei.com>, <peter.huangpeng@...wei.com>
Subject: Re: [PATCH v2 3/4] KVM: X86: Migration is supported



On 2015/11/11 23:15, Paolo Bonzini wrote:
>
>
> On 23/10/2015 11:15, Jian Zhou wrote:
>> data *msr_info)
>>   		}
>>   		break;
>>   	case MSR_IA32_DEBUGCTLMSR:
>> -		if (!data) {
>> -			/* We support the non-activated case already */
>> -			break;
>> -		} else if (data & ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF)) {
>> -			/* Values other than LBR and BTF are vendor-specific,
>> -			   thus reserved and should throw a #GP */
>> +		supported = DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF |
>> +				DEBUGCTLMSR_FREEZE_LBRS_ON_PMI;
>> +
>> +		if (data & ~supported) {
>> +			/*
>> +			 * Values other than LBR/BTF/FREEZE_LBRS_ON_PMI
>> +			 * are not supported, thus reserved and should throw a #GP
>> +			 */
>> +			vcpu_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
>> +					__func__, data);
>>   			return 1;
>>   		}
>> -		vcpu_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
>> -			    __func__, data);
>> +		if (kvm_x86_ops->set_debugctlmsr) {
>> +			if (kvm_x86_ops->set_debugctlmsr(vcpu, data))
>> +				return 1;
>> +		}
>> +		else
>> +			return 1;
>> +
>>   		break;
>>   	case 0x200 ... 0x2ff:
>>   		return kvm_mtrr_set_msr(vcpu, msr, data);
>> @@ -2078,6 +2090,33 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
>>   			vcpu_unimpl(vcpu, "disabled perfctr wrmsr: "
>>   				    "0x%x data 0x%llx\n", msr, data);
>>   		break;
>> +	case MSR_LBR_STATUS:
>> +		if (kvm_x86_ops->set_debugctlmsr) {
>> +			vcpu->arch.lbr_status = (data == 0) ? 0 : 1;
>> +			if (data)
>> +				kvm_x86_ops->set_debugctlmsr(vcpu,
>> +						DEBUGCTLMSR_LBR | DEBUGCTLMSR_FREEZE_LBRS_ON_PMI);
>> +		} else
>> +			vcpu_unimpl(vcpu, "lbr is disabled, ignored wrmsr: "
>> +					"0x%x data 0x%llx\n", msr, data);
>> +		break;
>> +	case MSR_LBR_SELECT:
>> +	case MSR_LBR_TOS:
>> +	case MSR_PENTIUM4_LER_FROM_LIP:
>> +	case MSR_PENTIUM4_LER_TO_LIP:
>> +	case MSR_PENTIUM4_LBR_TOS:
>> +	case MSR_IA32_LASTINTFROMIP:
>> +	case MSR_IA32_LASTINTTOIP:
>> +	case MSR_LBR_CORE2_FROM ... MSR_LBR_CORE2_FROM + 0x7:
>> +	case MSR_LBR_CORE2_TO ... MSR_LBR_CORE2_TO + 0x7:
>> +	case MSR_LBR_NHM_FROM ... MSR_LBR_NHM_FROM + 0x1f:
>> +	case MSR_LBR_NHM_TO ... MSR_LBR_NHM_TO + 0x1f:
>> +		if (kvm_x86_ops->set_lbr_msr)
>> +			kvm_x86_ops->set_lbr_msr(vcpu, msr, data);
>> +		else
>> +			vcpu_unimpl(vcpu, "lbr is disabled, ignored wrmsr: "
>> +					"0x%x data 0x%llx\n", msr, data);
>
> I think you can just do this in kvm_x86_ops->set_msr.  The old
> implementation for DEBUGCTL MSR can be moved to svm.c.

   I think you mean "moved to vmx.c"?

   Thanks,
   Jian

> Paolo
>
> .
>

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