linux-kernel - Re: [PATCH Part2 RFC v4 30/40] KVM: X86: Define new RMP check related #NPF error bits

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Date:   Fri, 16 Jul 2021 20:22:59 +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 30/40] KVM: X86: Define new RMP check
 related #NPF error bits

Nit, please use "KVM: x86:" for the shortlogs.  And ubernit, the "new" part is
redundant and/or misleading, e.g. implies that more error code bits are being
added to existing SNP/RMP checks.  E.g.

  KVM: x86: Define RMP page fault error code bits for #NPT

On Wed, Jul 07, 2021, Brijesh Singh wrote:
> When SEV-SNP is enabled globally, the hardware places restrictions on all
> memory accesses based on the RMP entry, whether the hyperviso or a VM,

Another typo.

> performs the accesses. When hardware encounters an RMP access violation
> during a guest access, it will cause a #VMEXIT(NPF).