4c5b9aac6c
Port I/O instructions trigger #VE in the TDX environment. In response to the exception, kernel emulates these instructions using hypercalls. But during early boot, on the decompression stage, it is cumbersome to deal with #VE. It is cleaner to go to hypercalls directly, bypassing #VE handling. Hook up TDX-specific port I/O helpers if booting in TDX environment. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com> Link: https://lkml.kernel.org/r/20220405232939.73860-17-kirill.shutemov@linux.intel.com
40 lines
945 B
C
40 lines
945 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_SHARED_TDX_H
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#define _ASM_X86_SHARED_TDX_H
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#include <linux/bits.h>
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#include <linux/types.h>
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#define TDX_HYPERCALL_STANDARD 0
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#define TDX_HCALL_HAS_OUTPUT BIT(0)
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#define TDX_HCALL_ISSUE_STI BIT(1)
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#define TDX_CPUID_LEAF_ID 0x21
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#define TDX_IDENT "IntelTDX "
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#ifndef __ASSEMBLY__
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/*
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* Used in __tdx_hypercall() to pass down and get back registers' values of
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* the TDCALL instruction when requesting services from the VMM.
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*
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* This is a software only structure and not part of the TDX module/VMM ABI.
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*/
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struct tdx_hypercall_args {
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u64 r10;
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u64 r11;
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u64 r12;
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u64 r13;
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u64 r14;
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u64 r15;
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};
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/* Used to request services from the VMM */
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u64 __tdx_hypercall(struct tdx_hypercall_args *args, unsigned long flags);
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/* Called from __tdx_hypercall() for unrecoverable failure */
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void __tdx_hypercall_failed(void);
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_X86_SHARED_TDX_H */
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