[PATCH v18 016/121] KVM: TDX: Add helper functions to print TDX SEAMCALL error

[isaku . yamahata]

From: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>

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

Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
Reviewed-by: Binbin Wu <binbin.wu@xxxxxxxxxxxxxxx>
---
v18:
- Added Reviewed-by Binbin.
---
 arch/x86/kvm/Makefile        |  2 +-
 arch/x86/kvm/vmx/tdx_error.c | 21 +++++++++++++++++++++
 arch/x86/kvm/vmx/tdx_ops.h   |  5 +++++
 3 files changed, 27 insertions(+), 1 deletion(-)
 create mode 100644 arch/x86/kvm/vmx/tdx_error.c

diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index 5b85ef84b2e9..44b0594da877 100644
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -24,7 +24,7 @@ kvm-intel-y		+= vmx/vmx.o vmx/vmenter.o vmx/pmu_intel.o vmx/vmcs12.o \
 
 kvm-intel-$(CONFIG_X86_SGX_KVM)	+= vmx/sgx.o
 kvm-intel-$(CONFIG_KVM_HYPERV)	+= vmx/hyperv.o vmx/hyperv_evmcs.o
-kvm-intel-$(CONFIG_INTEL_TDX_HOST)	+= vmx/tdx.o
+kvm-intel-$(CONFIG_INTEL_TDX_HOST)	+= vmx/tdx.o vmx/tdx_error.o
 
 kvm-amd-y		+= svm/svm.o svm/vmenter.o svm/pmu.o svm/nested.o svm/avic.o \
 			   svm/sev.o
diff --git a/arch/x86/kvm/vmx/tdx_error.c b/arch/x86/kvm/vmx/tdx_error.c
new file mode 100644
index 000000000000..42fcabe1f6c7
--- /dev/null
+++ b/arch/x86/kvm/vmx/tdx_error.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0
+/* functions to record TDX SEAMCALL error */
+
+#include <linux/kernel.h>
+#include <linux/bug.h>
+
+#include "tdx_ops.h"
+
+void pr_tdx_error(u64 op, u64 error_code, const struct tdx_module_args *out)
+{
+	if (!out) {
+		pr_err_ratelimited("SEAMCALL (0x%016llx) failed: 0x%016llx\n",
+				   op, error_code);
+		return;
+	}
+
+#define MSG	\
+	"SEAMCALL (0x%016llx) failed: 0x%016llx RCX 0x%016llx RDX 0x%016llx R8 0x%016llx R9 0x%016llx R10 0x%016llx R11 0x%016llx\n"
+	pr_err_ratelimited(MSG, op, error_code, out->rcx, out->rdx, out->r8,
+			   out->r9, out->r10, out->r11);
+}
diff --git a/arch/x86/kvm/vmx/tdx_ops.h b/arch/x86/kvm/vmx/tdx_ops.h
index f4c16e5265f0..cd12e9c2a421 100644
--- a/arch/x86/kvm/vmx/tdx_ops.h
+++ b/arch/x86/kvm/vmx/tdx_ops.h
@@ -10,6 +10,7 @@
 #include <asm/cacheflush.h>
 #include <asm/asm.h>
 #include <asm/kvm_host.h>
+#include <asm/tdx.h>
 
 #include "tdx_errno.h"
 #include "tdx_arch.h"
@@ -47,6 +48,10 @@ static inline u64 tdx_seamcall(u64 op, struct tdx_module_args *in,
 	return ret;
 }
 
+#ifdef CONFIG_INTEL_TDX_HOST
+void pr_tdx_error(u64 op, u64 error_code, const struct tdx_module_args *out);
+#endif
+
 static inline u64 tdh_mng_addcx(hpa_t tdr, hpa_t addr)
 {
 	struct tdx_module_args in = {
-- 
2.25.1