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 */
42 struct 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
55 void __init tdx_early_init(void);
56
57 void tdx_get_ve_info(struct ve_info *ve);
58
59 bool tdx_handle_virt_exception(struct pt_regs *regs, struct ve_info *ve);
60
61 void tdx_safe_halt(void);
62
63 bool tdx_early_handle_ve(struct pt_regs *regs);
64
65 int tdx_mcall_get_report0(u8 *reportdata, u8 *tdreport);
66
67 u64 tdx_hcall_get_quote(u8 *buf, size_t size);
68
69 #else
70
tdx_early_init(void)71 static inline void tdx_early_init(void) { };
tdx_safe_halt(void)72 static inline void tdx_safe_halt(void) { };
73
tdx_early_handle_ve(struct pt_regs * regs)74 static 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)
79 long tdx_kvm_hypercall(unsigned int nr, unsigned long p1, unsigned long p2,
80 unsigned long p3, unsigned long p4);
81 #else
tdx_kvm_hypercall(unsigned int nr,unsigned long p1,unsigned long p2,unsigned long p3,unsigned long p4)82 static 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
91 u64 __seamcall(u64 fn, struct tdx_module_args *args);
92 u64 __seamcall_ret(u64 fn, struct tdx_module_args *args);
93 u64 __seamcall_saved_ret(u64 fn, struct tdx_module_args *args);
94 void tdx_init(void);
95
96 #include <asm/archrandom.h>
97
98 typedef u64 (*sc_func_t)(u64 fn, struct tdx_module_args *args);
99
sc_retry(sc_func_t func,u64 fn,struct tdx_module_args * args)100 static 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))
116 int tdx_cpu_enable(void);
117 int tdx_enable(void);
118 const char *tdx_dump_mce_info(struct mce *m);
119 #else
tdx_init(void)120 static inline void tdx_init(void) { }
tdx_cpu_enable(void)121 static inline int tdx_cpu_enable(void) { return -ENODEV; }
tdx_enable(void)122 static inline int tdx_enable(void) { return -ENODEV; }
tdx_dump_mce_info(struct mce * m)123 static 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 */
128