From: Isaku Yamahata <isaku.yamahata@xxxxxxxxx> Add helper functions to print out errors from the TDX module in an uniform way. Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx> --- arch/x86/kvm/Makefile | 1 + arch/x86/kvm/vmx/seamcall.h | 3 ++ arch/x86/kvm/vmx/tdx_error.c | 53 ++++++++++++++++++++++++++++++++++++ 3 files changed, 57 insertions(+) create mode 100644 arch/x86/kvm/vmx/tdx_error.c diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile index 75dfd27b6e8a..c7eceff49e67 100644 --- a/arch/x86/kvm/Makefile +++ b/arch/x86/kvm/Makefile @@ -29,6 +29,7 @@ kvm-$(CONFIG_KVM_XEN) += xen.o kvm-intel-y += vmx/vmx.o vmx/vmenter.o vmx/pmu_intel.o vmx/vmcs12.o \ vmx/evmcs.o vmx/nested.o vmx/posted_intr.o kvm-intel-$(CONFIG_X86_SGX_KVM) += vmx/sgx.o +kvm-intel-$(CONFIG_INTEL_TDX_HOST) += 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/seamcall.h b/arch/x86/kvm/vmx/seamcall.h index f27e9d27137d..5fa948054be6 100644 --- a/arch/x86/kvm/vmx/seamcall.h +++ b/arch/x86/kvm/vmx/seamcall.h @@ -106,6 +106,9 @@ static inline u64 seamcall(u64 op, u64 rcx, u64 rdx, u64 r8, u64 r9, u64 r10, return ret; } +void pr_tdx_ex_ret_info(u64 op, u64 error_code, const struct tdx_ex_ret *ex_ret); +void pr_tdx_error(u64 op, u64 error_code, const struct tdx_ex_ret *ex_ret); + #endif /* !__ASSEMBLER__ */ #endif /* CONFIG_INTEL_TDX_HOST */ diff --git a/arch/x86/kvm/vmx/tdx_error.c b/arch/x86/kvm/vmx/tdx_error.c new file mode 100644 index 000000000000..1a4f91397758 --- /dev/null +++ b/arch/x86/kvm/vmx/tdx_error.c @@ -0,0 +1,53 @@ +// SPDX-License-Identifier: GPL-2.0 +/* functions to record TDX SEAMCALL error */ + +#include <linux/kernel.h> +#include <linux/bug.h> + +#include "tdx_errno.h" +#include "tdx_arch.h" +#include "tdx_ops.h" + +static const char * const TDX_SEPT_ENTRY_STATES[] = { + "SEPT_FREE", + "SEPT_BLOCKED", + "SEPT_PENDING", + "SEPT_PENDING_BLOCKED", + "SEPT_PRESENT" +}; + +void pr_tdx_ex_ret_info(u64 op, u64 error_code, const struct tdx_ex_ret *ex_ret) +{ + if (WARN_ON(!ex_ret)) + return; + + switch (error_code & TDX_SEAMCALL_STATUS_MASK) { + case TDX_EPT_WALK_FAILED: { + const char *state; + + if (ex_ret->sept_walk.state >= ARRAY_SIZE(TDX_SEPT_ENTRY_STATES)) + state = "Invalid"; + else + state = TDX_SEPT_ENTRY_STATES[ex_ret->sept_walk.state]; + + pr_err("Secure EPT walk error: SEPTE 0x%llx, level %d, %s\n", + ex_ret->sept_walk.septe, ex_ret->sept_walk.level, state); + break; + } + default: + /* TODO: print only meaningful registers depending on op */ + pr_err("RCX 0x%llx, RDX 0x%llx, R8 0x%llx, R9 0x%llx, " + "R10 0x%llx, R11 0x%llx\n", + ex_ret->regs.rcx, ex_ret->regs.rdx, ex_ret->regs.r8, + ex_ret->regs.r9, ex_ret->regs.r10, ex_ret->regs.r11); + break; + } +} + +void pr_tdx_error(u64 op, u64 error_code, const struct tdx_ex_ret *ex_ret) +{ + pr_err_ratelimited("SEAMCALL[0x%llx] failed: 0x%llx\n", + op, error_code); + if (ex_ret) + pr_tdx_ex_ret_info(op, error_code, ex_ret); +} -- 2.25.1