linux-kernel - Re: [PATCH v1 3/3] x86/tdx: Provide stub tdx_accept

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Message-ID: <20231123141113.l3kwputphhj3hxub@box.shutemov.name>
Date:   Thu, 23 Nov 2023 17:11:13 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Jeremi Piotrowski <jpiotrowski@...ux.microsoft.com>
Cc:     linux-kernel@...r.kernel.org, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Michael Kelley <mhkelley58@...il.com>,
        Nikolay Borisov <nik.borisov@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tom Lendacky <thomas.lendacky@....com>, x86@...nel.org,
        Dexuan Cui <decui@...rosoft.com>, linux-hyperv@...r.kernel.org,
        stefan.bader@...onical.com, tim.gardner@...onical.com,
        roxana.nicolescu@...onical.com, cascardo@...onical.com,
        kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
        sashal@...nel.org, stable@...r.kernel.org
Subject: Re: [PATCH v1 3/3] x86/tdx: Provide stub tdx_accept_memory() for
 non-TDX configs

On Wed, Nov 22, 2023 at 06:01:06PM +0100, Jeremi Piotrowski wrote:
> When CONFIG_INTEL_TDX_GUEST is not defined but CONFIG_UNACCEPTED_MEMORY=y is,
> the kernel fails to link with an undefined reference to tdx_accept_memory from
> arch_accept_memory. Provide a stub for tdx_accept_memory to fix the build for
> that configuration.
> 
> CONFIG_UNACCEPTED_MEMORY is also selected by CONFIG_AMD_MEM_ENCRYPT, and there
> are stubs for snp_accept_memory for when it is not defined. Previously this did
> not result in an error when CONFIG_INTEL_TDX_GUEST was not defined because the
> branch that references tdx_accept_memory() was being discarded due to
> DISABLE_TDX_GUEST being set.

And who unsets it now?

-- 
  Kiryl Shutsemau / Kirill A. Shutemov