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Subject: Re: [PATCH Part2 RFC v4 08/40] x86/traps: Define RMP violation #PF
 error code
To:     Sean Christopherson <seanjc@google.com>,
        Brijesh Singh <brijesh.singh@amd.com>
Cc:     x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
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        linux-coco@lists.linux.dev, linux-mm@kvack.org,
        linux-crypto@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Joerg Roedel <jroedel@suse.de>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        "H. Peter Anvin" <hpa@zytor.com>, Ard Biesheuvel <ardb@kernel.org>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Jim Mattson <jmattson@google.com>,
        Andy Lutomirski <luto@kernel.org>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Sergio Lopez <slp@redhat.com>, Peter Gonda <pgonda@google.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
        David Rientjes <rientjes@google.com>,
        Dov Murik <dovmurik@linux.ibm.com>,
        Tobin Feldman-Fitzthum <tobin@ibm.com>,
        Borislav Petkov <bp@alien8.de>,
        Michael Roth <michael.roth@amd.com>,
        Vlastimil Babka <vbabka@suse.cz>, tony.luck@intel.com,
        npmccallum@redhat.com, brijesh.ksingh@gmail.com
References: <20210707183616.5620-1-brijesh.singh@amd.com>
 <20210707183616.5620-9-brijesh.singh@amd.com> <YPCGVKESqZFWwdyB@google.com>
From:   Dave Hansen <dave.hansen@intel.com>
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Message-ID: <801770da-f9b3-77a6-1aea-cb9a7796c386@intel.com>
Date:   Thu, 15 Jul 2021 12:16:56 -0700
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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.