137 lines
3.4 KiB
C
137 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_SHARED_TDX_H
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#define _ASM_X86_SHARED_TDX_H
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#include <linux/bits.h>
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#include <linux/types.h>
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#define TDX_HYPERCALL_STANDARD 0
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#define TDX_CPUID_LEAF_ID 0x21
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#define TDX_IDENT "IntelTDX "
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/* TDX module Call Leaf IDs */
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#define TDG_VP_VMCALL 0
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#define TDG_VP_INFO 1
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#define TDG_VP_VEINFO_GET 3
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#define TDG_MR_REPORT 4
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#define TDG_MEM_PAGE_ACCEPT 6
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#define TDG_VM_WR 8
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/* TDCS fields. To be used by TDG.VM.WR and TDG.VM.RD module calls */
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#define TDCS_NOTIFY_ENABLES 0x9100000000000010
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/* TDX hypercall Leaf IDs */
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#define TDVMCALL_MAP_GPA 0x10001
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#define TDVMCALL_GET_QUOTE 0x10002
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#define TDVMCALL_REPORT_FATAL_ERROR 0x10003
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#define TDVMCALL_STATUS_RETRY 1
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/*
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* Bitmasks of exposed registers (with VMM).
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*/
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#define TDX_RDX BIT(2)
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#define TDX_RBX BIT(3)
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#define TDX_RSI BIT(6)
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#define TDX_RDI BIT(7)
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#define TDX_R8 BIT(8)
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#define TDX_R9 BIT(9)
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#define TDX_R10 BIT(10)
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#define TDX_R11 BIT(11)
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#define TDX_R12 BIT(12)
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#define TDX_R13 BIT(13)
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#define TDX_R14 BIT(14)
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#define TDX_R15 BIT(15)
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/*
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* These registers are clobbered to hold arguments for each
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* TDVMCALL. They are safe to expose to the VMM.
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* Each bit in this mask represents a register ID. Bit field
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* details can be found in TDX GHCI specification, section
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* titled "TDCALL [TDG.VP.VMCALL] leaf".
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*/
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#define TDVMCALL_EXPOSE_REGS_MASK \
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(TDX_RDX | TDX_RBX | TDX_RSI | TDX_RDI | TDX_R8 | TDX_R9 | \
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TDX_R10 | TDX_R11 | TDX_R12 | TDX_R13 | TDX_R14 | TDX_R15)
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/* TDX supported page sizes from the TDX module ABI. */
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#define TDX_PS_4K 0
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#define TDX_PS_2M 1
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#define TDX_PS_1G 2
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#define TDX_PS_NR (TDX_PS_1G + 1)
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#ifndef __ASSEMBLY__
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#include <linux/compiler_attributes.h>
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/*
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* Used in __tdcall*() to gather the input/output registers' values of the
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* TDCALL instruction when requesting services from the TDX module. This is a
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* software only structure and not part of the TDX module/VMM ABI
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*/
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struct tdx_module_args {
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/* callee-clobbered */
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u64 rcx;
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u64 rdx;
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u64 r8;
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u64 r9;
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/* extra callee-clobbered */
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u64 r10;
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u64 r11;
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/* callee-saved + rdi/rsi */
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u64 r12;
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u64 r13;
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u64 r14;
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u64 r15;
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u64 rbx;
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u64 rdi;
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u64 rsi;
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};
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/* Used to communicate with the TDX module */
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u64 __tdcall(u64 fn, struct tdx_module_args *args);
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u64 __tdcall_ret(u64 fn, struct tdx_module_args *args);
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u64 __tdcall_saved_ret(u64 fn, struct tdx_module_args *args);
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/* Used to request services from the VMM */
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u64 __tdx_hypercall(struct tdx_module_args *args);
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/*
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* Wrapper for standard use of __tdx_hypercall with no output aside from
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* return code.
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*/
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static inline u64 _tdx_hypercall(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15)
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{
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struct tdx_module_args args = {
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.r10 = TDX_HYPERCALL_STANDARD,
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.r11 = fn,
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.r12 = r12,
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.r13 = r13,
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.r14 = r14,
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.r15 = r15,
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};
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return __tdx_hypercall(&args);
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}
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/* Called from __tdx_hypercall() for unrecoverable failure */
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void __noreturn __tdx_hypercall_failed(void);
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bool tdx_accept_memory(phys_addr_t start, phys_addr_t end);
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/*
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* The TDG.VP.VMCALL-Instruction-execution sub-functions are defined
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* independently from but are currently matched 1:1 with VMX EXIT_REASONs.
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* Reusing the KVM EXIT_REASON macros makes it easier to connect the host and
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* guest sides of these calls.
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*/
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static __always_inline u64 hcall_func(u64 exit_reason)
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{
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return exit_reason;
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}
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_X86_SHARED_TDX_H */
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