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