linux-kernel - Re: [PATCH 07/12] KVM: x86: SEV: Treat C-bit as legal GPA bit regardless of vCPU mode

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Message-ID: <5fa85e81a54800737a1417be368f0061324e0aec.camel@intel.com>
Date:   Thu, 4 Feb 2021 02:03:16 +0000
From:   "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To:     "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "seanjc@...gle.com" <seanjc@...gle.com>
CC:     "jmattson@...gle.com" <jmattson@...gle.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "vkuznets@...hat.com" <vkuznets@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "thomas.lendacky@....com" <thomas.lendacky@....com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "brijesh.singh@....com" <brijesh.singh@....com>,
        "wanpengli@...cent.com" <wanpengli@...cent.com>
Subject: Re: [PATCH 07/12] KVM: x86: SEV: Treat C-bit as legal GPA bit
 regardless of vCPU mode

On Wed, 2021-02-03 at 16:01 -0800, Sean Christopherson wrote:
>  
> -       unsigned long cr3_lm_rsvd_bits;
> +       u64 reserved_gpa_bits;

LAM defines bits above the GFN in CR3:
https://software.intel.com/content/www/us/en/develop/download/intel-architecture-instruction-set-extensions-programming-reference.html

KVM doesn't support this today of course, but it might be confusing to
try to combine the two concepts.