1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_SHARED_TDX_H
3#define _ASM_X86_SHARED_TDX_H
4
5#include <linux/bits.h>
6#include <linux/types.h>
7
8#define TDX_HYPERCALL_STANDARD 0
9
10#define TDX_CPUID_LEAF_ID 0x21
11#define TDX_IDENT "IntelTDX "
12
13/* TDX module Call Leaf IDs */
14#define TDG_VP_VMCALL 0
15#define TDG_VP_INFO 1
16#define TDG_MR_RTMR_EXTEND 2
17#define TDG_VP_VEINFO_GET 3
18#define TDG_MR_REPORT 4
19#define TDG_MEM_PAGE_ACCEPT 6
20#define TDG_VM_RD 7
21#define TDG_VM_WR 8
22
23/* TDX attributes */
24#define TDX_ATTR_DEBUG_BIT 0
25#define TDX_ATTR_DEBUG BIT_ULL(TDX_ATTR_DEBUG_BIT)
26#define TDX_ATTR_HGS_PLUS_PROF_BIT 4
27#define TDX_ATTR_HGS_PLUS_PROF BIT_ULL(TDX_ATTR_HGS_PLUS_PROF_BIT)
28#define TDX_ATTR_PERF_PROF_BIT 5
29#define TDX_ATTR_PERF_PROF BIT_ULL(TDX_ATTR_PERF_PROF_BIT)
30#define TDX_ATTR_PMT_PROF_BIT 6
31#define TDX_ATTR_PMT_PROF BIT_ULL(TDX_ATTR_PMT_PROF_BIT)
32#define TDX_ATTR_ICSSD_BIT 16
33#define TDX_ATTR_ICSSD BIT_ULL(TDX_ATTR_ICSSD_BIT)
34#define TDX_ATTR_LASS_BIT 27
35#define TDX_ATTR_LASS BIT_ULL(TDX_ATTR_LASS_BIT)
36#define TDX_ATTR_SEPT_VE_DISABLE_BIT 28
37#define TDX_ATTR_SEPT_VE_DISABLE BIT_ULL(TDX_ATTR_SEPT_VE_DISABLE_BIT)
38#define TDX_ATTR_MIGRTABLE_BIT 29
39#define TDX_ATTR_MIGRTABLE BIT_ULL(TDX_ATTR_MIGRTABLE_BIT)
40#define TDX_ATTR_PKS_BIT 30
41#define TDX_ATTR_PKS BIT_ULL(TDX_ATTR_PKS_BIT)
42#define TDX_ATTR_KL_BIT 31
43#define TDX_ATTR_KL BIT_ULL(TDX_ATTR_KL_BIT)
44#define TDX_ATTR_TPA_BIT 62
45#define TDX_ATTR_TPA BIT_ULL(TDX_ATTR_TPA_BIT)
46#define TDX_ATTR_PERFMON_BIT 63
47#define TDX_ATTR_PERFMON BIT_ULL(TDX_ATTR_PERFMON_BIT)
48
49/* TDX TD-Scope Metadata. To be used by TDG.VM.WR and TDG.VM.RD */
50#define TDCS_CONFIG_FLAGS 0x1110000300000016
51#define TDCS_TD_CTLS 0x1110000300000017
52#define TDCS_NOTIFY_ENABLES 0x9100000000000010
53#define TDCS_TOPOLOGY_ENUM_CONFIGURED 0x9100000000000019
54
55/* TDCS_CONFIG_FLAGS bits */
56#define TDCS_CONFIG_FLEXIBLE_PENDING_VE BIT_ULL(1)
57
58/* TDCS_TD_CTLS bits */
59#define TD_CTLS_PENDING_VE_DISABLE_BIT 0
60#define TD_CTLS_PENDING_VE_DISABLE BIT_ULL(TD_CTLS_PENDING_VE_DISABLE_BIT)
61#define TD_CTLS_ENUM_TOPOLOGY_BIT 1
62#define TD_CTLS_ENUM_TOPOLOGY BIT_ULL(TD_CTLS_ENUM_TOPOLOGY_BIT)
63#define TD_CTLS_VIRT_CPUID2_BIT 2
64#define TD_CTLS_VIRT_CPUID2 BIT_ULL(TD_CTLS_VIRT_CPUID2_BIT)
65#define TD_CTLS_REDUCE_VE_BIT 3
66#define TD_CTLS_REDUCE_VE BIT_ULL(TD_CTLS_REDUCE_VE_BIT)
67#define TD_CTLS_LOCK_BIT 63
68#define TD_CTLS_LOCK BIT_ULL(TD_CTLS_LOCK_BIT)
69
70/* TDX hypercall Leaf IDs */
71#define TDVMCALL_GET_TD_VM_CALL_INFO 0x10000
72#define TDVMCALL_MAP_GPA 0x10001
73#define TDVMCALL_GET_QUOTE 0x10002
74#define TDVMCALL_REPORT_FATAL_ERROR 0x10003
75
76/*
77 * TDG.VP.VMCALL Status Codes (returned in R10)
78 */
79#define TDVMCALL_STATUS_SUCCESS 0x0000000000000000ULL
80#define TDVMCALL_STATUS_RETRY 0x0000000000000001ULL
81#define TDVMCALL_STATUS_INVALID_OPERAND 0x8000000000000000ULL
82#define TDVMCALL_STATUS_ALIGN_ERROR 0x8000000000000002ULL
83
84/*
85 * Bitmasks of exposed registers (with VMM).
86 */
87#define TDX_RDX BIT(2)
88#define TDX_RBX BIT(3)
89#define TDX_RSI BIT(6)
90#define TDX_RDI BIT(7)
91#define TDX_R8 BIT(8)
92#define TDX_R9 BIT(9)
93#define TDX_R10 BIT(10)
94#define TDX_R11 BIT(11)
95#define TDX_R12 BIT(12)
96#define TDX_R13 BIT(13)
97#define TDX_R14 BIT(14)
98#define TDX_R15 BIT(15)
99
100/*
101 * These registers are clobbered to hold arguments for each
102 * TDVMCALL. They are safe to expose to the VMM.
103 * Each bit in this mask represents a register ID. Bit field
104 * details can be found in TDX GHCI specification, section
105 * titled "TDCALL [TDG.VP.VMCALL] leaf".
106 */
107#define TDVMCALL_EXPOSE_REGS_MASK \
108 (TDX_RDX | TDX_RBX | TDX_RSI | TDX_RDI | TDX_R8 | TDX_R9 | \
109 TDX_R10 | TDX_R11 | TDX_R12 | TDX_R13 | TDX_R14 | TDX_R15)
110
111/* TDX supported page sizes from the TDX module ABI. */
112#define TDX_PS_4K 0
113#define TDX_PS_2M 1
114#define TDX_PS_1G 2
115#define TDX_PS_NR (TDX_PS_1G + 1)
116
117#ifndef __ASSEMBLER__
118
119#include <linux/compiler_attributes.h>
120
121/*
122 * Used in __tdcall*() to gather the input/output registers' values of the
123 * TDCALL instruction when requesting services from the TDX module. This is a
124 * software only structure and not part of the TDX module/VMM ABI
125 */
126struct tdx_module_args {
127 /* callee-clobbered */
128 u64 rcx;
129 u64 rdx;
130 u64 r8;
131 u64 r9;
132 /* extra callee-clobbered */
133 u64 r10;
134 u64 r11;
135 /* callee-saved + rdi/rsi */
136 u64 r12;
137 u64 r13;
138 u64 r14;
139 u64 r15;
140 u64 rbx;
141 u64 rdi;
142 u64 rsi;
143};
144
145/* Used to communicate with the TDX module */
146u64 __tdcall(u64 fn, struct tdx_module_args *args);
147u64 __tdcall_ret(u64 fn, struct tdx_module_args *args);
148u64 __tdcall_saved_ret(u64 fn, struct tdx_module_args *args);
149
150/* Used to request services from the VMM */
151u64 __tdx_hypercall(struct tdx_module_args *args);
152
153/*
154 * Wrapper for standard use of __tdx_hypercall with no output aside from
155 * return code.
156 */
157static inline u64 _tdx_hypercall(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15)
158{
159 struct tdx_module_args args = {
160 .r10 = TDX_HYPERCALL_STANDARD,
161 .r11 = fn,
162 .r12 = r12,
163 .r13 = r13,
164 .r14 = r14,
165 .r15 = r15,
166 };
167
168 return __tdx_hypercall(args: &args);
169}
170
171
172/* Called from __tdx_hypercall() for unrecoverable failure */
173void __noreturn __tdx_hypercall_failed(void);
174
175bool tdx_accept_memory(phys_addr_t start, phys_addr_t end);
176
177/*
178 * The TDG.VP.VMCALL-Instruction-execution sub-functions are defined
179 * independently from but are currently matched 1:1 with VMX EXIT_REASONs.
180 * Reusing the KVM EXIT_REASON macros makes it easier to connect the host and
181 * guest sides of these calls.
182 */
183static __always_inline u64 hcall_func(u64 exit_reason)
184{
185 return exit_reason;
186}
187
188#endif /* !__ASSEMBLER__ */
189#endif /* _ASM_X86_SHARED_TDX_H */
190

source code of linux/arch/x86/include/asm/shared/tdx.h