linux-kernel - Re: [PATCH v5 4/7] support user space to query RAS extension feature

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Message-ID: <1d75940a-dd1f-6349-a65a-adbbd221f41f@huawei.com>
Date:   Tue, 22 Aug 2017 09:20:20 +0800
From:   gengdongjiu <gengdongjiu@...wei.com>
To:     Christoffer Dall <cdall@...aro.org>
CC:     <christoffer.dall@...aro.org>, <marc.zyngier@....com>,
        <rkrcmar@...hat.com>, <linux@...linux.org.uk>,
        <catalin.marinas@....com>, <will.deacon@....com>,
        <lenb@...nel.org>, <robert.moore@...el.com>, <lv.zheng@...el.com>,
        <mark.rutland@....com>, <james.morse@....com>,
        <xiexiuqi@...wei.com>, <cov@...eaurora.org>,
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        <tbaicar@...eaurora.org>, <ard.biesheuvel@...aro.org>,
        <mingo@...nel.org>, <bp@...e.de>, <shiju.jose@...wei.com>,
        <zjzhang@...eaurora.org>, <linux-arm-kernel@...ts.infradead.org>,
        <kvmarm@...ts.cs.columbia.edu>, <kvm@...r.kernel.org>,
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        <shameerali.kolothum.thodi@...wei.com>, <huangdaode@...ilicon.com>,
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        <wuquanming@...wei.com>, <linuxarm@...wei.com>,
        <zhengqiang10@...wei.com>
Subject: Re: [PATCH v5 4/7] support user space to query RAS extension feature

Christoffer,
   Thanks for the review.

On 2017/8/22 5:08, Christoffer Dall wrote:
> On Fri, Aug 18, 2017 at 10:11:54PM +0800, Dongjiu Geng wrote:
> 
> You should put KVM and arm64 in the subject here.
I will update it in the next version.


> 
>> In armv8.2 RAS extension, it adds virtual SError exception
>> syndrome registeri(VSESR_EL2), user space will specify that
>> value. so user space will check whether CPU feature has RAS
>> extension. if has, it will specify the virtual SError syndrome
>> value. Otherwise, it will not set. This patch adds this support
>>
>> Signed-off-by: Dongjiu Geng <gengdongjiu@...wei.com>
>> ---
>>  arch/arm64/kvm/reset.c   | 3 +++
>>  include/uapi/linux/kvm.h | 1 +
>>  2 files changed, 4 insertions(+)
>>
>> diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
>> index 3256b9228e75..b7313ee028e9 100644
>> --- a/arch/arm64/kvm/reset.c
>> +++ b/arch/arm64/kvm/reset.c
>> @@ -77,6 +77,9 @@ int kvm_arch_dev_ioctl_check_extension(struct kvm *kvm, long ext)
>>  	case KVM_CAP_ARM_PMU_V3:
>>  		r = kvm_arm_support_pmu_v3();
>>  		break;
>> +	case KVM_CAP_ARM_RAS_EXTENSION:
>> +		r = cpus_have_const_cap(ARM64_HAS_RAS_EXTN);
>> +		break;
>>  	case KVM_CAP_SET_GUEST_DEBUG:
>>  	case KVM_CAP_VCPU_ATTRIBUTES:
>>  		r = 1;
>> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
>> index 6cd63c18708a..5a2a338cae57 100644
>> --- a/include/uapi/linux/kvm.h
>> +++ b/include/uapi/linux/kvm.h
>> @@ -929,6 +929,7 @@ struct kvm_ppc_resize_hpt {
>>  #define KVM_CAP_PPC_SMT_POSSIBLE 147
>>  #define KVM_CAP_HYPERV_SYNIC2 148
>>  #define KVM_CAP_HYPERV_VP_INDEX 149
>> +#define KVM_CAP_ARM_RAS_EXTENSION 150
>>  
>>  #ifdef KVM_CAP_IRQ_ROUTING
>>  
>> -- 
>> 2.14.0
>>
> 
> Thanks,
> -Christoffer
> 
> .
>