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kvm: Improve reporting of fatal errors

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Report KVM_EXIT_UNKNOWN, KVM_EXIT_FAIL_ENTRY, and KVM_EXIT_EXCEPTION
with more details to stderr. The latter two are so far x86-only, so move
them into the arch-specific handler. Integrate the Intel real mode
warning on KVM_EXIT_FAIL_ENTRY that qemu-kvm carries, but actually
restrict it to Intel CPUs. Moreover, always dump the CPU state in case
we fail.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Jan Kiszka 2011-01-21 21:48:07 +01:00 committed by Marcelo Tosatti
parent 73aaec4a39
commit bb44e0d12d
4 changed files with 45 additions and 17 deletions
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22
kvm-all.c
View File

@ -817,22 +817,22 @@ static int kvm_handle_io(uint16_t port, void *data, int direction, int size,
#ifdef KVM_CAP_INTERNAL_ERROR_DATA
static int kvm_handle_internal_error(CPUState *env, struct kvm_run *run)
{
fprintf(stderr, "KVM internal error.");
if (kvm_check_extension(kvm_state, KVM_CAP_INTERNAL_ERROR_DATA)) {
int i;
fprintf(stderr, "KVM internal error. Suberror: %d\n",
run->internal.suberror);
fprintf(stderr, " Suberror: %d\n", run->internal.suberror);
for (i = 0; i < run->internal.ndata; ++i) {
fprintf(stderr, "extra data[%d]: %"PRIx64"\n",
i, (uint64_t)run->internal.data[i]);
}
} else {
fprintf(stderr, "\n");
}
cpu_dump_state(env, stderr, fprintf, 0);
if (run->internal.suberror == KVM_INTERNAL_ERROR_EMULATION) {
fprintf(stderr, "emulation failure\n");
if (!kvm_arch_stop_on_emulation_error(env)) {
cpu_dump_state(env, stderr, fprintf, 0);
return 0;
}
}
@ -966,15 +966,8 @@ int kvm_cpu_exec(CPUState *env)
ret = 1;
break;
case KVM_EXIT_UNKNOWN:
DPRINTF("kvm_exit_unknown\n");
ret = -1;
break;
case KVM_EXIT_FAIL_ENTRY:
DPRINTF("kvm_exit_fail_entry\n");
ret = -1;
break;
case KVM_EXIT_EXCEPTION:
DPRINTF("kvm_exit_exception\n");
fprintf(stderr, "KVM: unknown exit, hardware reason %" PRIx64 "\n",
(uint64_t)run->hw.hardware_exit_reason);
ret = -1;
break;
#ifdef KVM_CAP_INTERNAL_ERROR_DATA
@ -1001,6 +994,7 @@ int kvm_cpu_exec(CPUState *env)
} while (ret > 0);
if (ret < 0) {
cpu_dump_state(env, stderr, fprintf, 0);
vm_stop(0);
env->exit_request = 1;
}

2
target-i386/cpu.h
View File

@ -874,6 +874,8 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
uint32_t *ecx, uint32_t *edx);
int cpu_x86_register (CPUX86State *env, const char *cpu_model);
void cpu_clear_apic_feature(CPUX86State *env);
void host_cpuid(uint32_t function, uint32_t count,
uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx);
/* helper.c */
int cpu_x86_handle_mmu_fault(CPUX86State *env, target_ulong addr,

5
target-i386/cpuid.c
View File

@ -103,9 +103,8 @@ typedef struct model_features_t {
int check_cpuid = 0;
int enforce_cpuid = 0;
static void host_cpuid(uint32_t function, uint32_t count,
uint32_t *eax, uint32_t *ebx,
uint32_t *ecx, uint32_t *edx)
void host_cpuid(uint32_t function, uint32_t count,
uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx)
{
#if defined(CONFIG_KVM)
uint32_t vec[4];

33
target-i386/kvm.c
View File

@ -1525,8 +1525,19 @@ static int kvm_handle_halt(CPUState *env)
return 1;
}
static bool host_supports_vmx(void)
{
uint32_t ecx, unused;
host_cpuid(1, 0, &unused, &unused, &ecx, &unused);
return ecx & CPUID_EXT_VMX;
}
#define VMX_INVALID_GUEST_STATE 0x80000021
int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run)
{
uint64_t code;
int ret = 0;
switch (run->exit_reason) {
@ -1537,6 +1548,28 @@ int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run)
case KVM_EXIT_SET_TPR:
ret = 1;
break;
case KVM_EXIT_FAIL_ENTRY:
code = run->fail_entry.hardware_entry_failure_reason;
fprintf(stderr, "KVM: entry failed, hardware error 0x%" PRIx64 "\n",
code);
if (host_supports_vmx() && code == VMX_INVALID_GUEST_STATE) {
fprintf(stderr,
"\nIf you're runnning a guest on an Intel machine without "
"unrestricted mode\n"
"support, the failure can be most likely due to the guest "
"entering an invalid\n"
"state for Intel VT. For example, the guest maybe running "
"in big real mode\n"
"which is not supported on less recent Intel processors."
"\n\n");
}
ret = -1;
break;
case KVM_EXIT_EXCEPTION:
fprintf(stderr, "KVM: exception %d exit (error code 0x%x)\n",
run->ex.exception, run->ex.error_code);
ret = -1;
break;
default:
fprintf(stderr, "KVM: unknown exit reason %d\n", run->exit_reason);
ret = -1;