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To:     "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        mingo@redhat.com, bp@alien8.de, dave.hansen@intel.com,
        luto@kernel.org, peterz@infradead.org
Cc:     sathyanarayanan.kuppuswamy@linux.intel.com, aarcange@redhat.com,
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        linux-kernel@vger.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [PATCHv6 26/30] x86/mm/cpa: Add support for TDX shared memory
In-Reply-To: <20220316020856.24435-27-kirill.shutemov@linux.intel.com>
References: <20220316020856.24435-1-kirill.shutemov@linux.intel.com>
 <20220316020856.24435-27-kirill.shutemov@linux.intel.com>
Date:   Thu, 17 Mar 2022 15:56:52 +0100
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On Wed, Mar 16 2022 at 05:08, Kirill A. Shutemov wrote:

> Intel TDX protects guest memory from VMM access. Any memory that is
> required for communication with the VMM must be explicitly shared.
>
> It is a two-step process: the guest sets the shared bit in the page
> table entry and notifies VMM about the change. The notification happens
> using MapGPA hypercall.
>
> Conversion back to private memory requires clearing the shared bit,
> notifying VMM with MapGPA hypercall following with accepting the memory
> with AcceptPage hypercall.
>
> Provide a TDX version of x86_platform.guest.* callbacks. It makes
> __set_memory_enc_pgtable() work right in TDX guest.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>