linux-kernel - Re: [RFC PATCH V3 10/16] x86/hyperv: Add smp support for sev-snp guest

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Date:   Fri, 3 Feb 2023 15:00:44 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     Tom Lendacky <thomas.lendacky@....com>, luto@...nel.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        seanjc@...gle.com, pbonzini@...hat.com, jgross@...e.com,
        tiala@...rosoft.com, kirill@...temov.name,
        jiangshan.ljs@...group.com, peterz@...radead.org,
        ashish.kalra@....com, srutherford@...gle.com,
        akpm@...ux-foundation.org, anshuman.khandual@....com,
        pawan.kumar.gupta@...ux.intel.com, adrian.hunter@...el.com,
        daniel.sneddon@...ux.intel.com, alexander.shishkin@...ux.intel.com,
        sandipan.das@....com, ray.huang@....com, brijesh.singh@....com,
        michael.roth@....com, venu.busireddy@...cle.com,
        sterritt@...gle.com, tony.luck@...el.com, samitolvanen@...gle.com,
        fenghua.yu@...el.com
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-hyperv@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [RFC PATCH V3 10/16] x86/hyperv: Add smp support for sev-snp
 guest

On 1/23/2023 11:30 PM, Tom Lendacky wrote:
> On 1/21/23 20:46, Tianyu Lan wrote:
>> From: Tianyu Lan <tiala@...rosoft.com>
>>
>> The wakeup_secondary_cpu callback was populated with wakeup_
>> cpu_via_vmgexit() which doesn't work for Hyper-V. Override it
> 
> An explanation as to why is doesn't work would be nice here.

Hi Thomas：
	Thanks for your review. Good idea. Will update.

>> diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
>> index cb1ee53ad3b1..f8b321a11ee4 100644
>> --- a/arch/x86/include/asm/svm.h
>> +++ b/arch/x86/include/asm/svm.h
>> @@ -336,6 +336,53 @@ struct vmcb_save_area {
> 
> Please don't update the vmcb_save_area, you should be using/updating the 
> sev_es_save_area structure for SNP.

OK. Will update in the next version.

>>             u64 sev_feature_restrict_injection    : 1;
>> +            u64 sev_feature_alternate_injection    : 1;
>> +            u64 sev_feature_full_debug        : 1;
>> +            u64 sev_feature_reserved1        : 1;
>> +            u64 sev_feature_snpbtb_isolation    : 1;
>> +            u64 sev_feature_resrved2        : 56;
> 
> For the bits definition, use:
> 
>              u64 sev_feature_snp            : 1,
>                  sev_feature_vtom            : 1,
>                  sev_feature_reflectvc        : 1,
>                  ...
> 

Good suggestion. Thanks.