linux-kernel - Re: [PATCH v2 02/12] mm: Introduce a function to check for virtualization protection features

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Date:   Sat, 14 Aug 2021 13:49:20 -0500
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        iommu@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-efi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-graphics-maintainer@...are.com,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        kexec@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
        Brijesh Singh <brijesh.singh@....com>,
        Joerg Roedel <joro@...tes.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH v2 02/12] mm: Introduce a function to check for
 virtualization protection features

On 8/14/21 1:32 PM, Borislav Petkov wrote:
> On Fri, Aug 13, 2021 at 11:59:21AM -0500, Tom Lendacky wrote:
>> diff --git a/include/linux/protected_guest.h b/include/linux/protected_guest.h
>> new file mode 100644
>> index 000000000000..43d4dde94793
>> --- /dev/null
>> +++ b/include/linux/protected_guest.h
>> @@ -0,0 +1,35 @@
>> +/* SPDX-License-Identifier: GPL-2.0-only */
>> +/*
>> + * Protected Guest (and Host) Capability checks
>> + *
>> + * Copyright (C) 2021 Advanced Micro Devices, Inc.
>> + *
>> + * Author: Tom Lendacky <thomas.lendacky@....com>
>> + */
>> +
>> +#ifndef _PROTECTED_GUEST_H
>> +#define _PROTECTED_GUEST_H
>> +
>> +#ifndef __ASSEMBLY__
> 	   ^^^^^^^^^^^^^
> 
> Do you really need that guard? It builds fine without it too. Or
> something coming later does need it...?

No, I probably did it out of habit. I can remove it in the next version.

Thanks,
Tom

>