linux-kernel - Re: [PATCH v2 3/4] x86: Expose SERIALIZE for supported cpuid

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Date:   Wed, 15 Jul 2020 06:42:08 +0800
From:   "Zhang, Cathy" <cathy.zhang@...el.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org, x86@...nel.org,
        pbonzini@...hat.com, vkuznets@...hat.com, wanpengli@...cent.com,
        jmattson@...gle.com, joro@...tes.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        ricardo.neri-calderon@...ux.intel.com, kyung.min.park@...el.com,
        jpoimboe@...hat.com, gregkh@...uxfoundation.org,
        ak@...ux.intel.com, dave.hansen@...el.com, tony.luck@...el.com,
        ravi.v.shankar@...el.com
Subject: Re: [PATCH v2 3/4] x86: Expose SERIALIZE for supported cpuid

On 7/14/2020 11:00 AM, Sean Christopherson wrote:
> On Tue, Jul 07, 2020 at 10:16:22AM +0800, Cathy Zhang wrote:
>> SERIALIZE instruction is supported by intel processors,
>> like Sapphire Rapids. Expose it in KVM supported cpuid.
> Providing at least a rough overview of the instruction, e.g. its enumeration,
> usage, fault rules, controls, etc... would be nice.  In isolation, the
> changelog isn't remotely helpful in understanding the correctness of the
> patch.
Thanks Sean! Add it in the next version.
>
>> Signed-off-by: Cathy Zhang <cathy.zhang@...el.com>
>> ---
>>   arch/x86/kvm/cpuid.c | 3 ++-
>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
>> index 8a294f9..e603aeb 100644
>> --- a/arch/x86/kvm/cpuid.c
>> +++ b/arch/x86/kvm/cpuid.c
>> @@ -341,7 +341,8 @@ void kvm_set_cpu_caps(void)
>>   	kvm_cpu_cap_mask(CPUID_7_EDX,
>>   		F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) |
>>   		F(SPEC_CTRL_SSBD) | F(ARCH_CAPABILITIES) | F(INTEL_STIBP) |
>> -		F(MD_CLEAR) | F(AVX512_VP2INTERSECT) | F(FSRM)
>> +		F(MD_CLEAR) | F(AVX512_VP2INTERSECT) | F(FSRM) |
>> +		F(SERIALIZE)
>>   	);
>>   
>>   	/* TSC_ADJUST and ARCH_CAPABILITIES are emulated in software. */
>> -- 
>> 1.8.3.1
>>