linux-kernel - Re: [RFC v2 27/32] x86/tdx: Exclude Shared bit from __PHYSICAL

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Message-ID: <YKbDtt2K4Z5gtYRc@google.com>
Date:   Thu, 20 May 2021 20:16:54 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        Raj Ashok <ashok.raj@...el.com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC v2 27/32] x86/tdx: Exclude Shared bit from __PHYSICAL_MASK

On Thu, May 20, 2021, Kuppuswamy, Sathyanarayanan wrote:
> So what is your proposal? "tdx_guest_" / "tdx_host_" ?

  1. Abstract things where appropriate, e.g. I'm guessing there is a clever way
     to deal with the shared vs. private inversion and avoid tdg_shared_mask
     altogether.

  2. Steal what SEV-ES did for the #VC handlers and use ve_ as the prefix for
     handlers.

  3. Use tdx_ everywhere else and handle the conflicts on a case-by-case basis
     with a healthy dose of common sense.  E.g. there should be no need to worry
     about "static __cpuidle void tdg_safe_halt(void)" colliding because neither
     the guest nor KVM should be exposing tdx_safe_halt() outside of its
     compilation unit.