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

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Message-ID: <3e6af3c5-4063-9b63-e80b-05d78f653ab2@linux.intel.com>
Date:   Tue, 18 May 2021 22:00:11 -0700
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Tony Luck <tony.luck@...el.com>
Cc:     Andi Kleen <ak@...ux.intel.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@...r.kernel.org
Subject: Re: [RFC v2 27/32] x86/tdx: Exclude Shared bit from __PHYSICAL_MASK

Hi Dave,

On 4/26/21 11:01 AM, Kuppuswamy Sathyanarayanan wrote:
> From: "Kirill A. Shutemov"<kirill.shutemov@...ux.intel.com>
> 
> tdx_shared_mask() returns the mask that has to be set in a page
> table entry to make page shared with VMM.
> 
> Also, note that we cannot club shared mapping configuration between
> AMD SME and Intel TDX Guest platforms in common function. SME has
> to do it very early in __startup_64() as it sets the bit on all
> memory, except what is used for communication. TDX can postpone as
> we don't need any shared mapping in very early boot.
> 
> Signed-off-by: Kirill A. Shutemov<kirill.shutemov@...ux.intel.com>
> Reviewed-by: Andi Kleen<ak@...ux.intel.com>
> Signed-off-by: Kuppuswamy Sathyanarayanan<sathyanarayanan.kuppuswamy@...ux.intel.com>

Any comments on this patch?

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer