Introduce a set of macros that allow to generate wrappers for TDVMCALL leafs. The macros uses tdvmcall_trmapoline() and provides SYSV-complaint ABI on top of it.
There are three macros differentiated by number of return parameters. Signed-off-by: Kirill A. Shutemov <[email protected]> --- arch/x86/include/asm/shared/tdx.h | 54 +++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/arch/x86/include/asm/shared/tdx.h b/arch/x86/include/asm/shared/tdx.h index 89f7fcade8ae..ddf2cc4a45da 100644 --- a/arch/x86/include/asm/shared/tdx.h +++ b/arch/x86/include/asm/shared/tdx.h @@ -76,6 +76,60 @@ #include <linux/compiler_attributes.h> +#define TDVMCALL_0(reason, in_r12, in_r13, in_r14, in_r15) \ +({ \ + long __ret; \ + \ + asm( \ + "call tdvmcall_trampoline\n\t" \ + "movq %%r10, %[r10_out]\n\t" \ + : [r10_out] "=r" (__ret), ASM_CALL_CONSTRAINT \ + : "a" (TDX_HYPERCALL_STANDARD), "b" (reason), \ + "D" (in_r12), "S"(in_r13), "d"(in_r14), "c" (in_r15) \ + : "r12", "r13", "r14", "r15" \ + ); \ + __ret; \ +}) + +#define TDVMCALL_1(reason, in_r12, in_r13, in_r14, in_r15, out_r11) \ +({ \ + long __ret; \ + \ + asm( \ + "call tdvmcall_trampoline\n\t" \ + "movq %%r10, %[r10_out]\n\t" \ + "movq %%r11, %[r11_out]\n\t" \ + : [r10_out] "=r" (__ret), [r11_out] "=r" (out_r11), \ + ASM_CALL_CONSTRAINT \ + : "a" (TDX_HYPERCALL_STANDARD), "b" (reason), \ + "D" (in_r12), "S"(in_r13), "d"(in_r14), "c" (in_r15) \ + : "r10", "r11", "r12", "r13", "r14", "r15" \ + ); \ + __ret; \ +}) + +#define TDVMCALL_4(reason, in_r12, in_r13, in_r14, in_r15, \ + out_r12, out_r13, out_r14, out_r15) \ +({ \ + long __ret; \ + \ + asm( \ + "call tdvmcall_trampoline\n\t" \ + "movq %%r10, %[r10_out]\n\t" \ + "movq %%r12, %[r12_out]\n\t" \ + "movq %%r13, %[r13_out]\n\t" \ + "movq %%r14, %[r14_out]\n\t" \ + "movq %%r15, %[r15_out]\n\t" \ + : [r10_out] "=r" (__ret), ASM_CALL_CONSTRAINT, \ + [r12_out] "=r" (out_r12), [r13_out] "=r" (out_r13), \ + [r14_out] "=r" (out_r14), [r15_out] "=r" (out_r15) \ + : "a" (TDX_HYPERCALL_STANDARD), "b" (reason), \ + "D" (in_r12), "S"(in_r13), "d"(in_r14), "c" (in_r15) \ + : "r10", "r12", "r13", "r14", "r15" \ + ); \ + __ret; \ +}) + /* * Used in __tdcall*() to gather the input/output registers' values of the * TDCALL instruction when requesting services from the TDX module. This is a -- 2.43.0
