linux-kernel - Re: [PATCH V6 5/8] x86/hyperv: Add Write/Read MSR registers via ghcb page

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Date:   Fri, 1 Oct 2021 21:31:55 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, decui@...rosoft.com, tglx@...utronix.de,
        mingo@...hat.com, x86@...nel.org, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        davem@...emloft.net, kuba@...nel.org, gregkh@...uxfoundation.org,
        arnd@...db.de, brijesh.singh@....com, jroedel@...e.de,
        Tianyu.Lan@...rosoft.com, thomas.lendacky@....com,
        pgonda@...gle.com, akpm@...ux-foundation.org, rppt@...nel.org,
        kirill.shutemov@...ux.intel.com, saravanand@...com,
        aneesh.kumar@...ux.ibm.com, rientjes@...gle.com, tj@...nel.org,
        michael.h.kelley@...rosoft.com, linux-arch@...r.kernel.org,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, vkuznets@...hat.com,
        konrad.wilk@...cle.com, hch@....de, robin.murphy@....com,
        joro@...tes.org, parri.andrea@...il.com, dave.hansen@...el.com
Subject: Re: [PATCH V6 5/8] x86/hyperv: Add Write/Read MSR registers via ghcb
 page



On 10/1/2021 2:20 AM, Borislav Petkov wrote:
> On Thu, Sep 30, 2021 at 09:05:41AM -0400, Tianyu Lan wrote:
>> diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c
>> index 9f90f460a28c..dd7f37de640b 100644
>> --- a/arch/x86/kernel/sev-shared.c
>> +++ b/arch/x86/kernel/sev-shared.c
>> @@ -94,10 +94,9 @@ static void vc_finish_insn(struct es_em_ctxt *ctxt)
>>   	ctxt->regs->ip += ctxt->insn.length;
>>   }
>>   
>> -static enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb,
>> -					  struct es_em_ctxt *ctxt,
>> -					  u64 exit_code, u64 exit_info_1,
>> -					  u64 exit_info_2)
>> +enum es_result sev_es_ghcb_hv_call_simple(struct ghcb *ghcb,
>> +				   u64 exit_code, u64 exit_info_1,
>> +				   u64 exit_info_2)
> Align arguments on the opening brace.
> 
> Also, there's nothing "simple" about it - what you've carved out does
> the actual HV call and the trailing part is verifying the HV info. So
> that function should be called
> 
> __sev_es_ghcb_hv_call()
> 
> and the outer one without the "__".
> 

Good suggestion. Will fix it in the next version.

Thanks.