KVM: TDX: Add helper functions to print TDX SEAMCALL error

Add helper functions to print out errors from the TDX module in a uniform
manner.

Signed-off-by: Isaku Yamahata <[email protected]>
Co-developed-by: Tony Lindgren <[email protected]>
Signed-off-by: Tony Lindgren <[email protected]>
Signed-off-by: Rick Edgecombe <[email protected]>
Reviewed-by: Binbin Wu <[email protected]>
Reviewed-by: Yuan Yao <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

Author: yamahata

arch/x86/kvm/vmx/tdx.c

@@ -10,6 +10,21 @@
 #undef pr_fmt
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#define pr_tdx_error(__fn, __err)	\
+	pr_err_ratelimited("SEAMCALL %s failed: 0x%llx\n", #__fn, __err)
+
+#define __pr_tdx_error_N(__fn_str, __err, __fmt, ...)		\
+	pr_err_ratelimited("SEAMCALL " __fn_str " failed: 0x%llx, " __fmt,  __err,  __VA_ARGS__)
+
+#define pr_tdx_error_1(__fn, __err, __rcx)		\
+	__pr_tdx_error_N(#__fn, __err, "rcx 0x%llx\n", __rcx)
+
+#define pr_tdx_error_2(__fn, __err, __rcx, __rdx)	\
+	__pr_tdx_error_N(#__fn, __err, "rcx 0x%llx, rdx 0x%llx\n", __rcx, __rdx)
+
+#define pr_tdx_error_3(__fn, __err, __rcx, __rdx, __r8)	\
+	__pr_tdx_error_N(#__fn, __err, "rcx 0x%llx, rdx 0x%llx, r8 0x%llx\n", __rcx, __rdx, __r8)
+
 bool enable_tdx __ro_after_init;
 module_param_named(tdx, enable_tdx, bool, 0444);