1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_SHARED_TDX_H
3 #define _ASM_X86_SHARED_TDX_H
5 #include <linux/bits.h>
6 #include <linux/types.h>
8 #define TDX_HYPERCALL_STANDARD 0
10 #define TDX_CPUID_LEAF_ID 0x21
11 #define TDX_IDENT "IntelTDX "
13 /* TDX module Call Leaf IDs */
14 #define TDG_VP_VMCALL 0
16 #define TDG_VP_VEINFO_GET 3
17 #define TDG_MR_REPORT 4
18 #define TDG_MEM_PAGE_ACCEPT 6
21 /* TDCS fields. To be used by TDG.VM.WR and TDG.VM.RD module calls */
22 #define TDCS_NOTIFY_ENABLES 0x9100000000000010
24 /* TDX hypercall Leaf IDs */
25 #define TDVMCALL_MAP_GPA 0x10001
26 #define TDVMCALL_GET_QUOTE 0x10002
27 #define TDVMCALL_REPORT_FATAL_ERROR 0x10003
29 #define TDVMCALL_STATUS_RETRY 1
32 * Bitmasks of exposed registers (with VMM).
34 #define TDX_RDX BIT(2)
35 #define TDX_RBX BIT(3)
36 #define TDX_RSI BIT(6)
37 #define TDX_RDI BIT(7)
40 #define TDX_R10 BIT(10)
41 #define TDX_R11 BIT(11)
42 #define TDX_R12 BIT(12)
43 #define TDX_R13 BIT(13)
44 #define TDX_R14 BIT(14)
45 #define TDX_R15 BIT(15)
48 * These registers are clobbered to hold arguments for each
49 * TDVMCALL. They are safe to expose to the VMM.
50 * Each bit in this mask represents a register ID. Bit field
51 * details can be found in TDX GHCI specification, section
52 * titled "TDCALL [TDG.VP.VMCALL] leaf".
54 #define TDVMCALL_EXPOSE_REGS_MASK \
55 (TDX_RDX | TDX_RBX | TDX_RSI | TDX_RDI | TDX_R8 | TDX_R9 | \
56 TDX_R10 | TDX_R11 | TDX_R12 | TDX_R13 | TDX_R14 | TDX_R15)
60 #include <linux/compiler_attributes.h>
63 * Used in __tdcall*() to gather the input/output registers' values of the
64 * TDCALL instruction when requesting services from the TDX module. This is a
65 * software only structure and not part of the TDX module/VMM ABI
67 struct tdx_module_args {
68 /* callee-clobbered */
73 /* extra callee-clobbered */
76 /* callee-saved + rdi/rsi */
86 /* Used to communicate with the TDX module */
87 u64 __tdcall(u64 fn, struct tdx_module_args *args);
88 u64 __tdcall_ret(u64 fn, struct tdx_module_args *args);
89 u64 __tdcall_saved_ret(u64 fn, struct tdx_module_args *args);
91 /* Used to request services from the VMM */
92 u64 __tdx_hypercall(struct tdx_module_args *args);
95 * Wrapper for standard use of __tdx_hypercall with no output aside from
98 static inline u64 _tdx_hypercall(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15)
100 struct tdx_module_args args = {
101 .r10 = TDX_HYPERCALL_STANDARD,
109 return __tdx_hypercall(&args);
113 /* Called from __tdx_hypercall() for unrecoverable failure */
114 void __noreturn __tdx_hypercall_failed(void);
116 bool tdx_accept_memory(phys_addr_t start, phys_addr_t end);
119 * The TDG.VP.VMCALL-Instruction-execution sub-functions are defined
120 * independently from but are currently matched 1:1 with VMX EXIT_REASONs.
121 * Reusing the KVM EXIT_REASON macros makes it easier to connect the host and
122 * guest sides of these calls.
124 static __always_inline u64 hcall_func(u64 exit_reason)
129 #endif /* !__ASSEMBLY__ */
130 #endif /* _ASM_X86_SHARED_TDX_H */