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x86/lapic: Load LAPIC state at post_load 

Load the LAPIC state during post_load (rather than when the CPU
starts).

This allows an interrupt to be delivered from the ioapic to
the lapic prior to cpu loading, in particular the RTC that starts
ticking as soon as we load it's state.

Fixes a case where Windows hangs after migration due to RTC interrupts
disappearing.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2016-09-12 18:18:35 +01:00 committed by Paolo Bonzini
parent 0342454f8a
commit 78d6a05d2f
3 changed files with 25 additions and 20 deletions
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27
hw/i386/kvm/apic.c
View File

@ -28,9 +28,8 @@ static inline uint32_t kvm_apic_get_reg(struct kvm_lapic_state *kapic,
return *((uint32_t *)(kapic->regs + (reg_id << 4)));
}
void kvm_put_apic_state(DeviceState *dev, struct kvm_lapic_state *kapic)
static void kvm_put_apic_state(APICCommonState *s, struct kvm_lapic_state *kapic)
{
APICCommonState *s = APIC_COMMON(dev);
int i;
memset(kapic, 0, sizeof(*kapic));
@ -125,6 +124,27 @@ static void kvm_apic_vapic_base_update(APICCommonState *s)
}
}
static void kvm_apic_put(void *data)
{
APICCommonState *s = data;
struct kvm_lapic_state kapic;
int ret;
kvm_put_apic_state(s, &kapic);
ret = kvm_vcpu_ioctl(CPU(s->cpu), KVM_SET_LAPIC, &kapic);
if (ret < 0) {
fprintf(stderr, "KVM_SET_LAPIC failed: %s\n", strerror(ret));
abort();
}
}
static void kvm_apic_post_load(APICCommonState *s)
{
fprintf(stderr, "%s: Yeh\n", __func__);
run_on_cpu(CPU(s->cpu), kvm_apic_put, s);
}
static void do_inject_external_nmi(void *data)
{
APICCommonState *s = data;
@ -178,6 +198,8 @@ static void kvm_apic_reset(APICCommonState *s)
{
/* Not used by KVM, which uses the CPU mp_state instead. */
s->wait_for_sipi = 0;
run_on_cpu(CPU(s->cpu), kvm_apic_put, s);
}
static void kvm_apic_realize(DeviceState *dev, Error **errp)
@ -206,6 +228,7 @@ static void kvm_apic_class_init(ObjectClass *klass, void *data)
k->set_base = kvm_apic_set_base;
k->set_tpr = kvm_apic_set_tpr;
k->get_tpr = kvm_apic_get_tpr;
k->post_load = kvm_apic_post_load;
k->enable_tpr_reporting = kvm_apic_enable_tpr_reporting;
k->vapic_base_update = kvm_apic_vapic_base_update;
k->external_nmi = kvm_apic_external_nmi;

1
include/sysemu/kvm.h
View File

@ -371,7 +371,6 @@ int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg);
void kvm_irqchip_add_irq_route(KVMState *s, int gsi, int irqchip, int pin);
void kvm_put_apic_state(DeviceState *d, struct kvm_lapic_state *kapic);
void kvm_get_apic_state(DeviceState *d, struct kvm_lapic_state *kapic);
struct kvm_guest_debug;

17
target-i386/kvm.c
View File

@ -2416,19 +2416,6 @@ static int kvm_get_apic(X86CPU *cpu)
return 0;
}
static int kvm_put_apic(X86CPU *cpu)
{
DeviceState *apic = cpu->apic_state;
struct kvm_lapic_state kapic;
if (apic && kvm_irqchip_in_kernel()) {
kvm_put_apic_state(apic, &kapic);
return kvm_vcpu_ioctl(CPU(cpu), KVM_SET_LAPIC, &kapic);
}
return 0;
}
static int kvm_put_vcpu_events(X86CPU *cpu, int level)
{
CPUState *cs = CPU(cpu);
@ -2670,10 +2657,6 @@ int kvm_arch_put_registers(CPUState *cpu, int level)
if (ret < 0) {
return ret;
}
ret = kvm_put_apic(x86_cpu);
if (ret < 0) {
return ret;
}
}
ret = kvm_put_tscdeadline_msr(x86_cpu);