linux-kernel - Re: [RFC Part1 PATCH 03/13] x86: add a helper routine for the PVALIDATE instruction

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Message-ID: <0c1037ce-cd40-0c22-0dae-29bcec488feb@amd.com>
Date:   Fri, 26 Mar 2021 15:04:35 -0500
From:   Brijesh Singh <brijesh.singh@....com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     brijesh.singh@....com, linux-kernel@...r.kernel.org,
        x86@...nel.org, kvm@...r.kernel.org, ak@...ux.intel.com,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Joerg Roedel <jroedel@...e.de>,
        "H. Peter Anvin" <hpa@...or.com>, Tony Luck <tony.luck@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        David Rientjes <rientjes@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>
Subject: Re: [RFC Part1 PATCH 03/13] x86: add a helper routine for the
 PVALIDATE instruction


On 3/26/21 2:12 PM, Borislav Petkov wrote:
> On Fri, Mar 26, 2021 at 01:22:24PM -0500, Brijesh Singh wrote:
>> Should I do the same for the sev-es.c ? Currently, I am keeping all the
>> SEV-SNP specific changes in sev-snp.{c,h}. After a rename of
>> sev-es.{c,h} from both the arch/x86/kernel and arch-x86/boot/compressed
>> I can add the SNP specific stuff to it.
>>
>> Thoughts ?
> SNP depends on the whole functionality in SEV-ES, right? Which means,
> SNP will need all the functionality of sev-es.c.

Yes, SEV-SNP needs the whole SEV-ES functionality.  I will work add
pre-patch to rename sev-es to sev, then add SNP changes in the sev.c.

thanks

>
> But sev-es.c is a lot more code than the header and snp is
>
>  arch/x86/kernel/sev-snp.c               | 269 ++++++++++++++++++++++++
>
> oh well, not so much.
>
> I guess a single
>
> arch/x86/kernel/sev.c
>
> is probably ok.
>
> We can always do arch/x86/kernel/sev/ later and split stuff then when it
> starts getting real fat and impacts complication times.
>
> Btw, there's also arch/x86/kernel/sev-es-shared.c and that can be
>
> arch/x86/kernel/sev-shared.c
>
> then.
>
> Thx.
>