linux-kernel - Re: [PATCH 01/11] mm: Introduce a function to check for virtualization protection features

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Date:   Wed, 11 Aug 2021 07:53:37 -0700
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Tom Lendacky <thomas.lendacky@....com>,
        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
Cc:     Borislav Petkov <bp@...en8.de>,
        Brijesh Singh <brijesh.singh@....com>,
        Joerg Roedel <joro@...tes.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>
Subject: Re: [PATCH 01/11] mm: Introduce a function to check for
 virtualization protection features



On 7/27/21 3:26 PM, Tom Lendacky wrote:
> diff --git a/include/linux/protected_guest.h b/include/linux/protected_guest.h
> new file mode 100644
> index 000000000000..f8ed7b72967b
> --- /dev/null
> +++ b/include/linux/protected_guest.h
> @@ -0,0 +1,32 @@
> +/* 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__

Can you include headers for bool type and false definition?

--- a/include/linux/protected_guest.h
+++ b/include/linux/protected_guest.h
@@ -12,6 +12,9 @@

  #ifndef __ASSEMBLY__

+#include <linux/types.h>
+#include <linux/stddef.h>

Otherwise, I see following errors in multi-config auto testing.

include/linux/protected_guest.h:40:15: error: unknown type name 'bool'
include/linux/protected_guest.h:40:63: error: 'false' undeclared (first use in this functi


> +
> +#define PATTR_MEM_ENCRYPT		0	/* Encrypted memory */
> +#define PATTR_HOST_MEM_ENCRYPT		1	/* Host encrypted memory */
> +#define PATTR_GUEST_MEM_ENCRYPT		2	/* Guest encrypted memory */
> +#define PATTR_GUEST_PROT_STATE		3	/* Guest encrypted state */
> +
> +#ifdef CONFIG_ARCH_HAS_PROTECTED_GUEST
> +
> +#include <asm/protected_guest.h>
> +
> +#else	/* !CONFIG_ARCH_HAS_PROTECTED_GUEST */
> +
> +static inline bool prot_guest_has(unsigned int attr) { return false; }
> +
> +#endif	/* CONFIG_ARCH_HAS_PROTECTED_GUEST */
> +
> +#endif	/* __ASSEMBLY__ */
> +
> +#endif	/* _PROTECTED_GUEST_H */

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer