arch/x86/include/asm/shared/tdx.h

   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 TDX_GET_INFO                    1
  15 #define TDX_GET_VEINFO                  3
  16 #define TDX_GET_REPORT                  4
  17 #define TDX_ACCEPT_PAGE                 6
  18 #define TDX_WR                          8
  19
  20 /* TDCS fields. To be used by TDG.VM.WR and TDG.VM.RD module calls */
  21 #define TDCS_NOTIFY_ENABLES             0x9100000000000010
  22
  23 /* TDX hypercall Leaf IDs */
  24 #define TDVMCALL_MAP_GPA                0x10001
  25 #define TDVMCALL_GET_QUOTE              0x10002
  26 #define TDVMCALL_REPORT_FATAL_ERROR     0x10003
  27
  28 #ifndef __ASSEMBLY__
  29
  30 /*
  31  * Used in __tdx_hypercall() to pass down and get back registers' values of
  32  * the TDCALL instruction when requesting services from the VMM.
  33  *
  34  * This is a software only structure and not part of the TDX module/VMM ABI.
  35  */
  36 struct tdx_hypercall_args {
  37         u64 r8;
  38         u64 r9;
  39         u64 r10;
  40         u64 r11;
  41         u64 r12;
  42         u64 r13;
  43         u64 r14;
  44         u64 r15;
  45         u64 rdi;
  46         u64 rsi;
  47         u64 rbx;
  48         u64 rdx;
  49 };
  50
  51 /* Used to request services from the VMM */
  52 u64 __tdx_hypercall(struct tdx_hypercall_args *args);
  53 u64 __tdx_hypercall_ret(struct tdx_hypercall_args *args);
  54
  55 /*
  56  * Wrapper for standard use of __tdx_hypercall with no output aside from
  57  * return code.
  58  */
  59 static inline u64 _tdx_hypercall(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15)
  60 {
  61         struct tdx_hypercall_args args = {
  62                 .r10 = TDX_HYPERCALL_STANDARD,
  63                 .r11 = fn,
  64                 .r12 = r12,
  65                 .r13 = r13,
  66                 .r14 = r14,
  67                 .r15 = r15,
  68         };
  69
  70         return __tdx_hypercall(&args);
  71 }
  72
  73
  74 /* Called from __tdx_hypercall() for unrecoverable failure */
  75 void __tdx_hypercall_failed(void);
  76
  77 /*
  78  * Used in __tdx_module_call() to gather the output registers' values of the
  79  * TDCALL instruction when requesting services from the TDX module. This is a
  80  * software only structure and not part of the TDX module/VMM ABI
  81  */
  82 struct tdx_module_output {
  83         u64 rcx;
  84         u64 rdx;
  85         u64 r8;
  86         u64 r9;
  87         u64 r10;
  88         u64 r11;
  89 };
  90
  91 /* Used to communicate with the TDX module */
  92 u64 __tdx_module_call(u64 fn, u64 rcx, u64 rdx, u64 r8, u64 r9,
  93                       struct tdx_module_output *out);
  94
  95 bool tdx_accept_memory(phys_addr_t start, phys_addr_t end);
  96
  97 /*
  98  * The TDG.VP.VMCALL-Instruction-execution sub-functions are defined
  99  * independently from but are currently matched 1:1 with VMX EXIT_REASONs.
 100  * Reusing the KVM EXIT_REASON macros makes it easier to connect the host and
 101  * guest sides of these calls.
 102  */
 103 static __always_inline u64 hcall_func(u64 exit_reason)
 104 {
 105         return exit_reason;
 106 }
 107
 108 #endif /* !__ASSEMBLY__ */
 109 #endif /* _ASM_X86_SHARED_TDX_H */