linux-kernel - [PATCH v15 013/115] KVM: TDX: Add helper functions to print TDX SEAMCALL error

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Message-Id: <c8588857397ef1f4c265bda57cab5cb70b31b267.1690322424.git.isaku.yamahata@intel.com>
Date:   Tue, 25 Jul 2023 15:13:24 -0700
From:   isaku.yamahata@...el.com
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     isaku.yamahata@...el.com, isaku.yamahata@...il.com,
        Paolo Bonzini <pbonzini@...hat.com>, erdemaktas@...gle.com,
        Sean Christopherson <seanjc@...gle.com>,
        Sagi Shahar <sagis@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Kai Huang <kai.huang@...el.com>,
        Zhi Wang <zhi.wang.linux@...il.com>, chen.bo@...el.com,
        hang.yuan@...el.com, tina.zhang@...el.com
Subject: [PATCH v15 013/115] KVM: TDX: Add helper functions to print TDX SEAMCALL error

From: Isaku Yamahata <isaku.yamahata@...el.com>

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

Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 arch/x86/kvm/Makefile        |  2 +-
 arch/x86/kvm/vmx/tdx_error.c | 20 ++++++++++++++++++++
 arch/x86/kvm/vmx/tdx_ops.h   |  5 +++++
 3 files changed, 26 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 4b01ab842ab7..e3354b784e10 100644
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -25,7 +25,7 @@ kvm-$(CONFIG_KVM_SMM)	+= smm.o
 kvm-intel-y		+= vmx/vmx.o vmx/vmenter.o vmx/pmu_intel.o vmx/vmcs12.o \
 			   vmx/hyperv.o vmx/nested.o vmx/posted_intr.o vmx/main.o
 kvm-intel-$(CONFIG_X86_SGX_KVM)	+= vmx/sgx.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 svm/hyperv.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..6459cbada713
--- /dev/null
+++ b/arch/x86/kvm/vmx/tdx_error.c
@@ -0,0 +1,20 @@
+// 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_output *out)
+{
+	if (!out) {
+		pr_err_ratelimited("SEAMCALL[%lld] failed: 0x%llx\n",
+				   op, error_code);
+		return;
+	}
+
+#define MSG	"SEAMCALL[%lld] failed: 0x%llx RCX 0x%llx RDX 0x%llx R8 0x%llx R9 0x%llx R10 0x%llx R11 0x%llx\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 d588a5507f5a..9db19c0711a9 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"
@@ -41,6 +42,10 @@ static inline u64 tdx_seamcall(u64 op, u64 rcx, u64 rdx, u64 r8, u64 r9,
 	return ret;
 }
 
+#ifdef CONFIG_INTEL_TDX_HOST
+void pr_tdx_error(u64 op, u64 error_code, const struct tdx_module_output *out);
+#endif
+
 static inline u64 tdh_mng_addcx(hpa_t tdr, hpa_t addr)
 {
 	clflush_cache_range(__va(addr), PAGE_SIZE);
-- 
2.25.1