linux-kernel - Re: [PATCH Part2 RFC v4 38/40] KVM: SVM: Provide support for SNP_GUEST

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Message-ID: <YPdJmKXhXKOZdlld@google.com>
Date:   Tue, 20 Jul 2021 22:09:28 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-efi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-coco@...ts.linux.dev, linux-mm@...ck.org,
        linux-crypto@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Joerg Roedel <jroedel@...e.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        "H. Peter Anvin" <hpa@...or.com>, Ard Biesheuvel <ardb@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Sergio Lopez <slp@...hat.com>, Peter Gonda <pgonda@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Dov Murik <dovmurik@...ux.ibm.com>,
        Tobin Feldman-Fitzthum <tobin@....com>,
        Borislav Petkov <bp@...en8.de>,
        Michael Roth <michael.roth@....com>,
        Vlastimil Babka <vbabka@...e.cz>, tony.luck@...el.com,
        npmccallum@...hat.com, brijesh.ksingh@...il.com
Subject: Re: [PATCH Part2 RFC v4 38/40] KVM: SVM: Provide support for
 SNP_GUEST_REQUEST NAE event

On Tue, Jul 20, 2021, Brijesh Singh wrote:
> 
> On 7/20/21 11:28 AM, Sean Christopherson wrote:
> > Out of curiosity, why 4 VMPCKs?  It seems completely arbitrary.
> > 
> 
> I believe the thought process was by providing 4 keys it can provide
> flexibility for each VMPL levels to use a different keys (if they wish). The
> firmware does not care about the vmpl level during the guest request
> handling, it just want to know which key is used for encrypting the payload
> so that he can decrypt and provide the  response for it.

Ah, I forgot about VMPLs.  That makes sense.

Thanks!