59bd54a84d
In preparation of extending cc_platform_has() API to support TDX guest, use CPUID instruction to detect support for TDX guests in the early boot code (via tdx_early_init()). Since copy_bootdata() is the first user of cc_platform_has() API, detect the TDX guest status before it. Define a synthetic feature flag (X86_FEATURE_TDX_GUEST) and set this bit in a valid TDX guest platform. Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Andi Kleen <ak@linux.intel.com> Reviewed-by: Tony Luck <tony.luck@intel.com> Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Borislav Petkov <bp@suse.de> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20220405232939.73860-2-kirill.shutemov@linux.intel.com
22 lines
409 B
C
22 lines
409 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (C) 2021-2022 Intel Corporation */
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#ifndef _ASM_X86_TDX_H
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#define _ASM_X86_TDX_H
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#include <linux/init.h>
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#define TDX_CPUID_LEAF_ID 0x21
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#define TDX_IDENT "IntelTDX "
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#ifdef CONFIG_INTEL_TDX_GUEST
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void __init tdx_early_init(void);
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#else
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static inline void tdx_early_init(void) { };
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#endif /* CONFIG_INTEL_TDX_GUEST */
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#endif /* _ASM_X86_TDX_H */
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