SYM_FUNC_END(__tdx_module_call)
/*
- * __tdx_hypercall() - Make hypercalls to a TDX VMM using TDVMCALL leaf
- * of TDCALL instruction
+ * TDX_HYPERCALL - Make hypercalls to a TDX VMM using TDVMCALL leaf of TDCALL
+ * instruction
*
* Transforms values in function call argument struct tdx_hypercall_args @args
* into the TDCALL register ABI. After TDCALL operation, VMM output is saved
- * back in @args.
+ * back in @args, if \ret is 1.
*
*-------------------------------------------------------------------------
* TD VMCALL ABI:
* specification. Non zero value indicates vendor
* specific ABI.
* R11 - VMCALL sub function number
- * RBX, RBP, RDI, RSI - Used to pass VMCALL sub function specific arguments.
+ * RBX, RDX, RDI, RSI - Used to pass VMCALL sub function specific arguments.
* R8-R9, R12-R15 - Same as above.
*
* Output Registers:
*
* RAX - TDCALL instruction status (Not related to hypercall
* output).
- * R10 - Hypercall output error code.
- * R11-R15 - Hypercall sub function specific output values.
+ * RBX, RDX, RDI, RSI - Hypercall sub function specific output values.
+ * R8-R15 - Same as above.
*
- *-------------------------------------------------------------------------
- *
- * __tdx_hypercall() function ABI:
- *
- * @args (RDI) - struct tdx_hypercall_args for input and output
- * @flags (RSI) - TDX_HCALL_* flags
- *
- * On successful completion, return the hypercall error code.
*/
-SYM_FUNC_START(__tdx_hypercall)
+.macro TDX_HYPERCALL ret:req
FRAME_BEGIN
/* Save callee-saved GPRs as mandated by the x86_64 ABI */
push %r12
push %rbx
- /* Free RDI and RSI to be used as TDVMCALL arguments */
+ /* Free RDI to be used as TDVMCALL arguments */
movq %rdi, %rax
- push %rsi
/* Copy hypercall registers from arg struct: */
movq TDX_HYPERCALL_r8(%rax), %r8
* and are handled by callers.
*/
testq %rax, %rax
- jne .Lpanic
+ jne .Lpanic\@
pop %rax
- /* Copy hypercall result registers to arg struct if needed */
- testq $TDX_HCALL_HAS_OUTPUT, (%rsp)
- jz .Lout
-
+ .if \ret
movq %r8, TDX_HYPERCALL_r8(%rax)
movq %r9, TDX_HYPERCALL_r9(%rax)
movq %r10, TDX_HYPERCALL_r10(%rax)
movq %rsi, TDX_HYPERCALL_rsi(%rax)
movq %rbx, TDX_HYPERCALL_rbx(%rax)
movq %rdx, TDX_HYPERCALL_rdx(%rax)
-.Lout:
+ .endif
+
/* TDVMCALL leaf return code is in R10 */
movq %r10, %rax
xor %rdi, %rdi
xor %rdx, %rdx
- /* Remove TDX_HCALL_* flags from the stack */
- pop %rsi
-
/* Restore callee-saved GPRs as mandated by the x86_64 ABI */
pop %rbx
pop %r12
FRAME_END
RET
-.Lpanic:
+.Lpanic\@:
call __tdx_hypercall_failed
/* __tdx_hypercall_failed never returns */
REACHABLE
- jmp .Lpanic
+ jmp .Lpanic\@
+.endm
+
+/*
+ *
+ * __tdx_hypercall() function ABI:
+ *
+ * @args (RDI) - struct tdx_hypercall_args for input
+ *
+ * On successful completion, return the hypercall error code.
+ */
+SYM_FUNC_START(__tdx_hypercall)
+ TDX_HYPERCALL ret=0
SYM_FUNC_END(__tdx_hypercall)
+
+/*
+ *
+ * __tdx_hypercall_ret() function ABI:
+ *
+ * @args (RDI) - struct tdx_hypercall_args for input and output
+ *
+ * On successful completion, return the hypercall error code.
+ */
+SYM_FUNC_START(__tdx_hypercall_ret)
+ TDX_HYPERCALL ret=1
+SYM_FUNC_END(__tdx_hypercall_ret)
.r15 = r15,
};
- return __tdx_hypercall(&args, 0);
+ return __tdx_hypercall(&args);
}
/* Called from __tdx_hypercall() for unrecoverable failure */
.r14 = p4,
};
- return __tdx_hypercall(&args, 0);
+ return __tdx_hypercall(&args);
}
EXPORT_SYMBOL_GPL(tdx_kvm_hypercall);
#endif
* happens to return.
*/
while (1)
- __tdx_hypercall(&args, 0);
+ __tdx_hypercall(&args);
}
static void tdx_parse_tdinfo(u64 *cc_mask)
* can keep the vCPU in virtual HLT, even if an IRQ is
* pending, without hanging/breaking the guest.
*/
- return __tdx_hypercall(&args, 0);
+ return __tdx_hypercall(&args);
}
static int handle_halt(struct ve_info *ve)
* can be found in TDX Guest-Host-Communication Interface
* (GHCI), section titled "TDG.VP.VMCALL<Instruction.RDMSR>".
*/
- if (__tdx_hypercall(&args, TDX_HCALL_HAS_OUTPUT))
+ if (__tdx_hypercall_ret(&args))
return -EIO;
regs->ax = lower_32_bits(args.r11);
* can be found in TDX Guest-Host-Communication Interface
* (GHCI) section titled "TDG.VP.VMCALL<Instruction.WRMSR>".
*/
- if (__tdx_hypercall(&args, 0))
+ if (__tdx_hypercall(&args))
return -EIO;
return ve_instr_len(ve);
* ABI can be found in TDX Guest-Host-Communication Interface
* (GHCI), section titled "VP.VMCALL<Instruction.CPUID>".
*/
- if (__tdx_hypercall(&args, TDX_HCALL_HAS_OUTPUT))
+ if (__tdx_hypercall_ret(&args))
return -EIO;
/*
.r15 = *val,
};
- if (__tdx_hypercall(&args, TDX_HCALL_HAS_OUTPUT))
+ if (__tdx_hypercall_ret(&args))
return false;
*val = args.r11;
return true;
* in TDX Guest-Host-Communication Interface (GHCI) section titled
* "TDG.VP.VMCALL<Instruction.IO>".
*/
- success = !__tdx_hypercall(&args, TDX_HCALL_HAS_OUTPUT);
+ success = !__tdx_hypercall_ret(&args);
/* Update part of the register affected by the emulated instruction */
regs->ax &= ~mask;