linux-kernel - Re: [RFC v2 14/32] x86/tdx: Handle port I/O

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Message-ID: <CAPcyv4iwaUmiL-qwxvTxyKatxD+uFza8fvkFQxokHBy=a9=p4A@mail.gmail.com>
Date:   Mon, 10 May 2021 17:21:16 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        Raj Ashok <ashok.raj@...el.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC v2 14/32] x86/tdx: Handle port I/O

On Mon, May 10, 2021 at 5:01 PM Andi Kleen <ak@lin
[..]
> > I.e. shouldn't port-io instruction escapes
> > that would cause #VE be precluded at build-time?
>
> You mean in objtool? That would seem like overkill for a more theoretical
> problem.

Oh, sorry, no, I was not implying objtool overkill, just that the
mainline kernel should not be surprised by spurious instruction usage.