linux-kernel - Re: [PATCH Part2 RFC v4 31/40] KVM: X86: update page-fault trace to log the 64-bit error code

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Date:   Fri, 16 Jul 2021 20:25:58 +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 31/40] KVM: X86: update page-fault trace to
 log the 64-bit error code

On Wed, Jul 07, 2021, Brijesh Singh wrote:
> The page-fault error code is a 64-bit value, but the trace prints only

It's worth clarifying that #NPT has a 64-bit error code, and so KVM also passes
around a 64-bit PFEC.  E.g. the above statement is wrong for legacy #PF.

> the lower 32-bits. Some of the SEV-SNP RMP fault error codes are
> available in the upper 32-bits.

Can you send this separately with Cc: stable@?  And I guess tweak the changelog
to replace "SEV-SNP RMP" with a reference to e.g. PFERR_GUEST_FINAL_MASK.  KVM
already has error codes that can set the upper bits.