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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2021-2022 Intel Corporation */
#ifndef _ASM_X86_TDX_H
#define _ASM_X86_TDX_H
#include <linux/init.h>
#include <linux/bits.h>
#include <asm/ptrace.h>
#include <asm/shared/tdx.h>
/*
* SW-defined error codes.
*
* Bits 47:40 == 0xFF indicate Reserved status code class that never used by
* TDX module.
*/
#define TDX_ERROR _BITUL(63)
#define TDX_SW_ERROR (TDX_ERROR | GENMASK_ULL(47, 40))
#define TDX_SEAMCALL_VMFAILINVALID (TDX_SW_ERROR | _UL(0xFFFF0000))
#ifndef __ASSEMBLY__
/*
* Used to gather the output registers values of the TDCALL and SEAMCALL
* instructions when requesting services from the TDX module.
*
* This is a software only structure and not part of the TDX module/VMM ABI.
*/
struct tdx_module_output {
u64 rcx;
u64 rdx;
u64 r8;
u64 r9;
u64 r10;
u64 r11;
};
/*
* Used by the #VE exception handler to gather the #VE exception
* info from the TDX module. This is a software only structure
* and not part of the TDX module/VMM ABI.
*/
struct ve_info {
u64 exit_reason;
u64 exit_qual;
/* Guest Linear (virtual) Address */
u64 gla;
/* Guest Physical Address */
u64 gpa;
u32 instr_len;
u32 instr_info;
};
#ifdef CONFIG_INTEL_TDX_GUEST
void __init tdx_early_init(void);
/* Used to communicate with the TDX module */
u64 __tdx_module_call(u64 fn, u64 rcx, u64 rdx, u64 r8, u64 r9,
struct tdx_module_output *out);
void tdx_get_ve_info(struct ve_info *ve);
bool tdx_handle_virt_exception(struct pt_regs *regs, struct ve_info *ve);
void tdx_safe_halt(void);
bool tdx_early_handle_ve(struct pt_regs *regs);
#else
static inline void tdx_early_init(void) { };
static inline void tdx_safe_halt(void) { };
static inline bool tdx_early_handle_ve(struct pt_regs *regs) { return false; }
#endif /* CONFIG_INTEL_TDX_GUEST */
#if defined(CONFIG_KVM_GUEST) && defined(CONFIG_INTEL_TDX_GUEST)
long tdx_kvm_hypercall(unsigned int nr, unsigned long p1, unsigned long p2,
unsigned long p3, unsigned long p4);
#else
static inline long tdx_kvm_hypercall(unsigned int nr, unsigned long p1,
unsigned long p2, unsigned long p3,
unsigned long p4)
{
return -ENODEV;
}
#endif /* CONFIG_INTEL_TDX_GUEST && CONFIG_KVM_GUEST */
#endif /* !__ASSEMBLY__ */
#endif /* _ASM_X86_TDX_H */
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