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[PATCH v8 28/55] i386/tdx: Handle KVM_SYSTEM_EVENT_TDX_FATAL

Xiaoyao Li posted 55 patches 10 months, 2 weeks ago
[PATCH v8 28/55] i386/tdx: Handle KVM_SYSTEM_EVENT_TDX_FATAL
Posted by Xiaoyao Li 10 months, 2 weeks ago 
TD guest can use TDG.VP.VMCALL<REPORT_FATAL_ERROR> to request
termination. KVM translates such request into KVM_EXIT_SYSTEM_EVENT with
type of KVM_SYSTEM_EVENT_TDX_FATAL.

Add hanlder for such exit. Parse and print the error message, and
terminate the TD guest in the handler.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
---
Changes in v8:
 - update to the new data ABI of KVM_SYSTEM_EVENT_TDX_FATAL;

Changes in v6:
 - replace the patch " i386/tdx: Handle TDG.VP.VMCALL<REPORT_FATAL_ERROR>"
   in v5;
---
 target/i386/kvm/kvm.c      | 10 +++++++++
 target/i386/kvm/tdx-stub.c |  5 +++++
 target/i386/kvm/tdx.c      | 45 ++++++++++++++++++++++++++++++++++++++
 target/i386/kvm/tdx.h      |  2 ++
 4 files changed, 62 insertions(+)

diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index 7de5014051eb..a76f34537908 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -6128,6 +6128,16 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
     case KVM_EXIT_HYPERCALL:
         ret = kvm_handle_hypercall(run);
         break;
+    case KVM_EXIT_SYSTEM_EVENT:
+        switch (run->system_event.type) {
+        case KVM_SYSTEM_EVENT_TDX_FATAL:
+            ret = tdx_handle_report_fatal_error(cpu, run);
+            break;
+        default:
+            ret = -1;
+            break;
+        }
+        break;
     default:
         fprintf(stderr, "KVM: unknown exit reason %d\n", run->exit_reason);
         ret = -1;
diff --git a/target/i386/kvm/tdx-stub.c b/target/i386/kvm/tdx-stub.c
index 7748b6d0a446..720a4ff046ee 100644
--- a/target/i386/kvm/tdx-stub.c
+++ b/target/i386/kvm/tdx-stub.c
@@ -13,3 +13,8 @@ int tdx_parse_tdvf(void *flash_ptr, int size)
 {
     return -EINVAL;
 }
+
+int tdx_handle_report_fatal_error(X86CPU *cpu, struct kvm_run *run)
+{
+    return -EINVAL;
+}
diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c
index f8953f598584..74b7e3ac85fe 100644
--- a/target/i386/kvm/tdx.c
+++ b/target/i386/kvm/tdx.c
@@ -607,6 +607,51 @@ int tdx_parse_tdvf(void *flash_ptr, int size)
     return tdvf_parse_metadata(&tdx_guest->tdvf, flash_ptr, size);
 }
 
+int tdx_handle_report_fatal_error(X86CPU *cpu, struct kvm_run *run)
+{
+    uint64_t error_code = run->system_event.data[R_R12];
+    uint64_t reg_mask = run->system_event.data[R_ECX];
+    char *message = NULL;
+    uint64_t *tmp;
+
+    if (error_code & 0xffff) {
+        error_report("TDX: REPORT_FATAL_ERROR: invalid error code: 0x%lx",
+                     error_code);
+        return -1;
+    }
+
+/*
+ * Only 8 registers can contain valid ASCII byte stream to form the fatal
+ * message, and their sequence is: R14, R15, RBX, RDI, RSI, R8, R9, RDX
+ */
+#define TDX_FATAL_MESSAGE_MAX        64
+    if (reg_mask) {
+        message = g_malloc0(TDX_FATAL_MESSAGE_MAX + 1);
+        tmp = (uint64_t *)message;
+
+#define COPY_REG(REG)                               \
+    do {                                            \
+        if (reg_mask & BIT_ULL(REG)) {              \
+            *(tmp++) = run->system_event.data[REG]; \
+        }                                           \
+    } while (0)
+
+        COPY_REG(R_R14);
+        COPY_REG(R_R15);
+        COPY_REG(R_EBX);
+        COPY_REG(R_EDI);
+        COPY_REG(R_ESI);
+        COPY_REG(R_R8);
+        COPY_REG(R_R9);
+        COPY_REG(R_EDX);
+        *((char *)tmp) = '\0';
+    }
+#undef COPY_REG
+
+    error_report("TD guest reports fatal error. %s", message ? : "");
+    return -1;
+}
+
 static bool tdx_guest_get_sept_ve_disable(Object *obj, Error **errp)
 {
     TdxGuest *tdx = TDX_GUEST(obj);
diff --git a/target/i386/kvm/tdx.h b/target/i386/kvm/tdx.h
index 36a7400e7480..04b5afe199f9 100644
--- a/target/i386/kvm/tdx.h
+++ b/target/i386/kvm/tdx.h
@@ -8,6 +8,7 @@
 #endif
 
 #include "confidential-guest.h"
+#include "cpu.h"
 #include "hw/i386/tdvf.h"
 
 #define TYPE_TDX_GUEST "tdx-guest"
@@ -59,5 +60,6 @@ bool is_tdx_vm(void);
 int tdx_pre_create_vcpu(CPUState *cpu, Error **errp);
 void tdx_set_tdvf_region(MemoryRegion *tdvf_mr);
 int tdx_parse_tdvf(void *flash_ptr, int size);
+int tdx_handle_report_fatal_error(X86CPU *cpu, struct kvm_run *run);
 
 #endif /* QEMU_I386_TDX_H */
-- 
2.34.1
Re: [PATCH v8 28/55] i386/tdx: Handle KVM_SYSTEM_EVENT_TDX_FATAL
Posted by Zhao Liu 9 months, 2 weeks ago 
On Tue, Apr 01, 2025 at 09:01:38AM -0400, Xiaoyao Li wrote:
> Date: Tue,  1 Apr 2025 09:01:38 -0400
> From: Xiaoyao Li <xiaoyao.li@intel.com>
> Subject: [PATCH v8 28/55] i386/tdx: Handle KVM_SYSTEM_EVENT_TDX_FATAL
> X-Mailer: git-send-email 2.34.1
> 
> TD guest can use TDG.VP.VMCALL<REPORT_FATAL_ERROR> to request
> termination. KVM translates such request into KVM_EXIT_SYSTEM_EVENT with
> type of KVM_SYSTEM_EVENT_TDX_FATAL.
> 
> Add hanlder for such exit. Parse and print the error message, and
> terminate the TD guest in the handler.
> 
> Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
> ---
> Changes in v8:
>  - update to the new data ABI of KVM_SYSTEM_EVENT_TDX_FATAL;
> 
> Changes in v6:
>  - replace the patch " i386/tdx: Handle TDG.VP.VMCALL<REPORT_FATAL_ERROR>"
>    in v5;
> ---
>  target/i386/kvm/kvm.c      | 10 +++++++++
>  target/i386/kvm/tdx-stub.c |  5 +++++
>  target/i386/kvm/tdx.c      | 45 ++++++++++++++++++++++++++++++++++++++
>  target/i386/kvm/tdx.h      |  2 ++
>  4 files changed, 62 insertions(+)
> 
> diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
> index 7de5014051eb..a76f34537908 100644
> --- a/target/i386/kvm/kvm.c
> +++ b/target/i386/kvm/kvm.c
> @@ -6128,6 +6128,16 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
>      case KVM_EXIT_HYPERCALL:
>          ret = kvm_handle_hypercall(run);
>          break;
> +    case KVM_EXIT_SYSTEM_EVENT:
> +        switch (run->system_event.type) {
> +        case KVM_SYSTEM_EVENT_TDX_FATAL:
> +            ret = tdx_handle_report_fatal_error(cpu, run);
> +            break;
> +        default:
> +            ret = -1;
> +            break;
> +        }
> +        break;
>      default:
>          fprintf(stderr, "KVM: unknown exit reason %d\n", run->exit_reason);
>          ret = -1;
> diff --git a/target/i386/kvm/tdx-stub.c b/target/i386/kvm/tdx-stub.c
> index 7748b6d0a446..720a4ff046ee 100644
> --- a/target/i386/kvm/tdx-stub.c
> +++ b/target/i386/kvm/tdx-stub.c
> @@ -13,3 +13,8 @@ int tdx_parse_tdvf(void *flash_ptr, int size)
>  {
>      return -EINVAL;
>  }
> +
> +int tdx_handle_report_fatal_error(X86CPU *cpu, struct kvm_run *run)
> +{
> +    return -EINVAL;
> +}
> diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c
> index f8953f598584..74b7e3ac85fe 100644
> --- a/target/i386/kvm/tdx.c
> +++ b/target/i386/kvm/tdx.c
> @@ -607,6 +607,51 @@ int tdx_parse_tdvf(void *flash_ptr, int size)
>      return tdvf_parse_metadata(&tdx_guest->tdvf, flash_ptr, size);
>  }
>  
> +int tdx_handle_report_fatal_error(X86CPU *cpu, struct kvm_run *run)
> +{
> +    uint64_t error_code = run->system_event.data[R_R12];
> +    uint64_t reg_mask = run->system_event.data[R_ECX];
> +    char *message = NULL;
> +    uint64_t *tmp;
> +
> +    if (error_code & 0xffff) {
> +        error_report("TDX: REPORT_FATAL_ERROR: invalid error code: 0x%lx",
> +                     error_code);
> +        return -1;
> +    }
> +
> +/*
> + * Only 8 registers can contain valid ASCII byte stream to form the fatal
> + * message, and their sequence is: R14, R15, RBX, RDI, RSI, R8, R9, RDX
> + */
> +#define TDX_FATAL_MESSAGE_MAX        64

At least, for this macro, and TDX_REPORT_FATAL_ERROR_GPA_VALID in later
patch, could we move these simple macro definitions out of the function?

This could improve the readability for this one function.

> +    if (reg_mask) {
> +        message = g_malloc0(TDX_FATAL_MESSAGE_MAX + 1);
> +        tmp = (uint64_t *)message;
> +
> +#define COPY_REG(REG)                               \
> +    do {                                            \
> +        if (reg_mask & BIT_ULL(REG)) {              \
> +            *(tmp++) = run->system_event.data[REG]; \
> +        }                                           \
> +    } while (0)
> +
> +        COPY_REG(R_R14);
> +        COPY_REG(R_R15);
> +        COPY_REG(R_EBX);
> +        COPY_REG(R_EDI);
> +        COPY_REG(R_ESI);
> +        COPY_REG(R_R8);
> +        COPY_REG(R_R9);
> +        COPY_REG(R_EDX);
> +        *((char *)tmp) = '\0';
> +    }
> +#undef COPY_REG
> +
> +    error_report("TD guest reports fatal error. %s", message ? : "");
> +    return -1;
> +}
> +

Otherwise,

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>

Patchew 2.1-devel-b67e4c2

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