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i386/tdx: Wire TDX_REPORT_FATAL_ERROR with GuestPanic facility

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Integrate TDX's TDX_REPORT_FATAL_ERROR into QEMU GuestPanic facility

Originated-from: Isaku Yamahata <isaku.yamahata@intel.com>
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250508150002.689633-30-xiaoyao.li@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiaoyao Li 2025-05-08 10:59:35 -04:00 • committed by Paolo Bonzini
parent 98dbfd6849
commit 6e250463b0
3 changed files with 118 additions and 3 deletions
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65
system/runstate.c
View file

@ -590,6 +590,58 @@ static void qemu_system_wakeup(void)
}
}
static char *tdx_parse_panic_message(char *message)
{
bool printable = false;
char *buf = NULL;
int len = 0, i;
/*
* Although message is defined as a json string, we shouldn't
* unconditionally treat it as is because the guest generated it and
* it's not necessarily trustable.
*/
if (message) {
/* The caller guarantees the NULL-terminated string. */
len = strlen(message);
printable = len > 0;
for (i = 0; i < len; i++) {
if (!(0x20 <= message[i] && message[i] <= 0x7e)) {
printable = false;
break;
}
}
}
if (len == 0) {
buf = g_malloc(1);
buf[0] = '\0';
} else {
if (!printable) {
/* 3 = length of "%02x " */
buf = g_malloc(len * 3);
for (i = 0; i < len; i++) {
if (message[i] == '\0') {
break;
} else {
sprintf(buf + 3 * i, "%02x ", message[i]);
}
}
if (i > 0) {
/* replace the last ' '(space) to NULL */
buf[i * 3 - 1] = '\0';
} else {
buf[0] = '\0';
}
} else {
buf = g_strdup(message);
}
}
return buf;
}
void qemu_system_guest_panicked(GuestPanicInformation *info)
{
qemu_log_mask(LOG_GUEST_ERROR, "Guest crashed");
@ -631,7 +683,20 @@ void qemu_system_guest_panicked(GuestPanicInformation *info)
S390CrashReason_str(info->u.s390.reason),
info->u.s390.psw_mask,
info->u.s390.psw_addr);
} else if (info->type == GUEST_PANIC_INFORMATION_TYPE_TDX) {
char *message = tdx_parse_panic_message(info->u.tdx.message);
qemu_log_mask(LOG_GUEST_ERROR,
"\nTDX guest reports fatal error."
" error code: 0x%" PRIx32 " error message:\"%s\"\n",
info->u.tdx.error_code, message);
g_free(message);
if (info->u.tdx.gpa != -1ull) {
qemu_log_mask(LOG_GUEST_ERROR, "Additional error information "
"can be found at gpa page: 0x%" PRIx64 "\n",
info->u.tdx.gpa);
}
}
qapi_free_GuestPanicInformation(info);
}
}