linux-kernel - Re: [PATCH v17 013/116] KVM: TDX: Add helper functions to print TDX SEAMCALL error

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Date:   Wed, 6 Dec 2023 14:47:58 +0800
From:   Binbin Wu <binbin.wu@...ux.intel.com>
To:     isaku.yamahata@...el.com
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        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: Re: [PATCH v17 013/116] KVM: TDX: Add helper functions to print TDX
 SEAMCALL error



On 11/7/2023 10:55 PM, isaku.yamahata@...el.com wrote:
> From: Isaku Yamahata <isaku.yamahata@...el.com>
>
> Add helper functions to print out errors from the TDX module in a uniform
> manner.

Reviewed-by: Binbin Wu <binbin.wu@...ux.intel.com>
>
> 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..d083c79a2331
> --- /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_args *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 a55977626ae3..c9f74b2400a7 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"
> @@ -57,6 +58,10 @@ 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_args *out);
> +#endif
> +
>   static inline u64 tdh_mng_addcx(hpa_t tdr, hpa_t addr)
>   {
>   	clflush_cache_range(__va(addr), PAGE_SIZE);