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

[Yuan Yao]

On Mon, Jan 22, 2024 at 03:52:52PM -0800, isaku.yamahata@xxxxxxxxx wrote:
> 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>

Just not sure the reason of this #include here, compile fine w/o it.

Reviewed-by: Yuan Yao <yuan.yao@xxxxxxxxx>

>
>  #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
>
>