linux-kernel - Re: [PATCH Part2 RFC v4 08/40] x86/traps: Define RMP violation #PF error code

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Date:   Thu, 15 Jul 2021 12:16:56 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        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 08/40] x86/traps: Define RMP violation #PF
 error code

On 7/15/21 12:02 PM, Sean Christopherson wrote:
>>  #ifndef _ASM_X86_TRAP_PF_H
>>  #define _ASM_X86_TRAP_PF_H
>>  
>> +#include <vdso/bits.h>  /* BIT() macro */
> What are people's thoughts on using linux/bits.h instead of vdso.bits.h, even
> though the vDSO version is technically sufficient?  Seeing the "vdso" reference
> definitely made me blink slowly a few times.

Ugh, missed that.  Yes, that does look very weird.

I don't see any reason to use that vdso/ version instead of BIT_ULL().
I suspect I said to use BIT() when I commented on this in a previous
round.  If so, that was wrong.