1/* SPDX-License-Identifier: GPL-2.0 */
  2/* Copyright (C) 2021-2022 Intel Corporation */
  3#ifndef _ASM_X86_TDX_H
  4#define _ASM_X86_TDX_H
  5
  6#include <linux/init.h>
  7#include <linux/bits.h>
  8
  9#include <asm/errno.h>
 10#include <asm/ptrace.h>
 11#include <asm/trapnr.h>
 12#include <asm/shared/tdx.h>
 13
 14/*
 15 * SW-defined error codes.
 16 *
 17 * Bits 47:40 == 0xFF indicate Reserved status code class that never used by
 18 * TDX module.
 19 */
 20#define TDX_ERROR			_BITUL(63)
 21#define TDX_SW_ERROR			(TDX_ERROR | GENMASK_ULL(47, 40))
 22#define TDX_SEAMCALL_VMFAILINVALID	(TDX_SW_ERROR | _UL(0xFFFF0000))
 23
 24#define TDX_SEAMCALL_GP			(TDX_SW_ERROR | X86_TRAP_GP)
 25#define TDX_SEAMCALL_UD			(TDX_SW_ERROR | X86_TRAP_UD)
 26
 27/*
 28 * TDX module SEAMCALL leaf function error codes
 29 */
 30#define TDX_SUCCESS		0ULL
 31#define TDX_RND_NO_ENTROPY	0x8000020300000000ULL
 32
 33#ifndef __ASSEMBLY__
 34
 35#include <uapi/asm/mce.h>
 36
 37/*
 38 * Used by the #VE exception handler to gather the #VE exception
 39 * info from the TDX module. This is a software only structure
 40 * and not part of the TDX module/VMM ABI.
 41 */
 42struct ve_info {
 43	u64 exit_reason;
 44	u64 exit_qual;
 45	/* Guest Linear (virtual) Address */
 46	u64 gla;
 47	/* Guest Physical Address */
 48	u64 gpa;
 49	u32 instr_len;
 50	u32 instr_info;
 51};
 52
 53#ifdef CONFIG_INTEL_TDX_GUEST
 54
 55void __init tdx_early_init(void);
 56
 57void tdx_get_ve_info(struct ve_info *ve);
 58
 59bool tdx_handle_virt_exception(struct pt_regs *regs, struct ve_info *ve);
 60
 61void tdx_safe_halt(void);
 62
 63bool tdx_early_handle_ve(struct pt_regs *regs);
 64
 65int tdx_mcall_get_report0(u8 *reportdata, u8 *tdreport);
 66
 67u64 tdx_hcall_get_quote(u8 *buf, size_t size);
 68
 69#else
 70
 71static inline void tdx_early_init(void) { };
 72static inline void tdx_safe_halt(void) { };
 73
 74static inline bool tdx_early_handle_ve(struct pt_regs *regs) { return false; }
 75
 76#endif /* CONFIG_INTEL_TDX_GUEST */
 77
 78#if defined(CONFIG_KVM_GUEST) && defined(CONFIG_INTEL_TDX_GUEST)
 79long tdx_kvm_hypercall(unsigned int nr, unsigned long p1, unsigned long p2,
 80		       unsigned long p3, unsigned long p4);
 81#else
 82static inline long tdx_kvm_hypercall(unsigned int nr, unsigned long p1,
 83				     unsigned long p2, unsigned long p3,
 84				     unsigned long p4)
 85{
 86	return -ENODEV;
 87}
 88#endif /* CONFIG_INTEL_TDX_GUEST && CONFIG_KVM_GUEST */
 89
 90#ifdef CONFIG_INTEL_TDX_HOST
 91u64 __seamcall(u64 fn, struct tdx_module_args *args);
 92u64 __seamcall_ret(u64 fn, struct tdx_module_args *args);
 93u64 __seamcall_saved_ret(u64 fn, struct tdx_module_args *args);
 94void tdx_init(void);
 95
 96#include <asm/archrandom.h>
 97
 98typedef u64 (*sc_func_t)(u64 fn, struct tdx_module_args *args);
 99
100static inline u64 sc_retry(sc_func_t func, u64 fn,
101			   struct tdx_module_args *args)
102{
103	int retry = RDRAND_RETRY_LOOPS;
104	u64 ret;
105
106	do {
107		ret = func(fn, args);
108	} while (ret == TDX_RND_NO_ENTROPY && --retry);
109
110	return ret;
111}
112
113#define seamcall(_fn, _args)		sc_retry(__seamcall, (_fn), (_args))
114#define seamcall_ret(_fn, _args)	sc_retry(__seamcall_ret, (_fn), (_args))
115#define seamcall_saved_ret(_fn, _args)	sc_retry(__seamcall_saved_ret, (_fn), (_args))
116int tdx_cpu_enable(void);
117int tdx_enable(void);
118const char *tdx_dump_mce_info(struct mce *m);
119#else
120static inline void tdx_init(void) { }
121static inline int tdx_cpu_enable(void) { return -ENODEV; }
122static inline int tdx_enable(void)  { return -ENODEV; }
123static inline const char *tdx_dump_mce_info(struct mce *m) { return NULL; }
124#endif	/* CONFIG_INTEL_TDX_HOST */
125
126#endif /* !__ASSEMBLY__ */
127#endif /* _ASM_X86_TDX_H */