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

Source file repositories/reference/linux-study-clean/arch/x86/include/asm/shared/tdx.h

File Facts

System
Linux kernel
Corpus path
arch/x86/include/asm/shared/tdx.h
Extension
.h
Size
5877 bytes
Lines
193
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

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 /* !__ASSEMBLER__ */
#endif /* _ASM_X86_SHARED_TDX_H */

Annotation

Implementation Notes