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kvm: x86: Inject pending MCE events on state writeback

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The current way of injecting MCE events without updating of and
synchronizing with the CPUState is broken and causes spurious
corruptions of the MCE-related parts of the CPUState.

As a first step towards a fix, enhance the state writeback code with
support for injecting events that are pending in the CPUState. A pending
exception will then be signaled via cpu_interrupt(CPU_INTERRUPT_MCE).
And, just like for TCG, we need to leave the halt state when
CPU_INTERRUPT_MCE is pending (left broken for the to-be-removed old KVM
code).

This will also allow to unify TCG and KVM injection code.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
CC: Huang Ying <ying.huang@intel.com>
CC: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
CC: Jin Dongming <jin.dongming@np.css.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Jan Kiszka 2011-03-02 08:56:14 +01:00 committed by Marcelo Tosatti
parent 990368650f
commit ab443475c9
1 changed files with 60 additions and 0 deletions
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60
target-i386/kvm.c
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@ -467,6 +467,38 @@ void kvm_inject_x86_mce(CPUState *cenv, int bank, uint64_t status,
#endif /* !KVM_CAP_MCE*/
}
static int kvm_inject_mce_oldstyle(CPUState *env)
{
#ifdef KVM_CAP_MCE
if (!kvm_has_vcpu_events() && env->exception_injected == EXCP12_MCHK) {
unsigned int bank, bank_num = env->mcg_cap & 0xff;
struct kvm_x86_mce mce;
env->exception_injected = -1;
/*
* There must be at least one bank in use if an MCE is pending.
* Find it and use its values for the event injection.
*/
for (bank = 0; bank < bank_num; bank++) {
if (env->mce_banks[bank * 4 + 1] & MCI_STATUS_VAL) {
break;
}
}
assert(bank < bank_num);
mce.bank = bank;
mce.status = env->mce_banks[bank * 4 + 1];
mce.mcg_status = env->mcg_status;
mce.addr = env->mce_banks[bank * 4 + 2];
mce.misc = env->mce_banks[bank * 4 + 3];
return kvm_vcpu_ioctl(env, KVM_X86_SET_MCE, &mce);
}
#endif /* KVM_CAP_MCE */
return 0;
}
static void cpu_update_state(void *opaque, int running, int reason)
{
CPUState *env = opaque;
@ -1539,6 +1571,11 @@ int kvm_arch_put_registers(CPUState *env, int level)
if (ret < 0) {
return ret;
}
/* must be before kvm_put_msrs */
ret = kvm_inject_mce_oldstyle(env);
if (ret < 0) {
return ret;
}
ret = kvm_put_msrs(env, level);
if (ret < 0) {
return ret;
@ -1677,6 +1714,29 @@ void kvm_arch_post_run(CPUState *env, struct kvm_run *run)
int kvm_arch_process_async_events(CPUState *env)
{
if (env->interrupt_request & CPU_INTERRUPT_MCE) {
/* We must not raise CPU_INTERRUPT_MCE if it's not supported. */
assert(env->mcg_cap);
env->interrupt_request &= ~CPU_INTERRUPT_MCE;
kvm_cpu_synchronize_state(env);
if (env->exception_injected == EXCP08_DBLE) {
/* this means triple fault */
qemu_system_reset_request();
env->exit_request = 1;
return 0;
}
env->exception_injected = EXCP12_MCHK;
env->has_error_code = 0;
env->halted = 0;
if (kvm_irqchip_in_kernel() && env->mp_state == KVM_MP_STATE_HALTED) {
env->mp_state = KVM_MP_STATE_RUNNABLE;
}
}
if (kvm_irqchip_in_kernel()) {
return 0;
}