Message-ID: <ce9b4a79-b877-211d-aee8-bbc02e6805b5@gmail.com>
Date:   Fri, 3 Feb 2023 15:00:44 +0800
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101
 Thunderbird/102.6.1
Subject: Re: [RFC PATCH V3 10/16] x86/hyperv: Add smp support for sev-snp
 guest
To:     Tom Lendacky <thomas.lendacky@amd.com>, luto@kernel.org,
        tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
        dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com,
        seanjc@google.com, pbonzini@redhat.com, jgross@suse.com,
        tiala@microsoft.com, kirill@shutemov.name,
        jiangshan.ljs@antgroup.com, peterz@infradead.org,
        ashish.kalra@amd.com, srutherford@google.com,
        akpm@linux-foundation.org, anshuman.khandual@arm.com,
        pawan.kumar.gupta@linux.intel.com, adrian.hunter@intel.com,
        daniel.sneddon@linux.intel.com, alexander.shishkin@linux.intel.com,
        sandipan.das@amd.com, ray.huang@amd.com, brijesh.singh@amd.com,
        michael.roth@amd.com, venu.busireddy@oracle.com,
        sterritt@google.com, tony.luck@intel.com, samitolvanen@google.com,
        fenghua.yu@intel.com
Cc:     linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        linux-hyperv@vger.kernel.org, linux-arch@vger.kernel.org
References: <20230122024607.788454-1-ltykernel@gmail.com>
 <20230122024607.788454-11-ltykernel@gmail.com>
 <62ffd8b2-3d88-499e-ba13-1da26f664c6f@amd.com>
From:   Tianyu Lan <ltykernel@gmail.com>
In-Reply-To: <62ffd8b2-3d88-499e-ba13-1da26f664c6f@amd.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
Precedence: bulk

On 1/23/2023 11:30 PM, Tom Lendacky wrote:
> On 1/21/23 20:46, Tianyu Lan wrote:
>> From: Tianyu Lan <tiala@microsoft.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.