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KVM: x86: fix lapic.timer_mode on restore 

lapic.timer_mode was not properly initialized after migration, which
broke few useful things, like login, by making every sleep eternal.

Fix this by calling apic_update_lvtt in kvm_apic_post_state_restore.

There are other slowpaths that update lvtt, so this patch makes sure
something similar doesn't happen again by calling apic_update_lvtt
after every modification.

Cc: stable@vger.kernel.org
Fixes: f30ebc312c ("KVM: x86: optimize some accesses to LVTT and SPIV")
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Radim Krčmář 2015-06-05 20:57:41 +02:00 committed by Marcelo Tosatti
parent d4a4f75cd8
commit b6ac069532
1 changed files with 16 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
arch/x86/kvm/lapic.c
View File

@ -1090,6 +1090,17 @@ static void update_divide_count(struct kvm_lapic *apic)
apic->divide_count);
}
static void apic_update_lvtt(struct kvm_lapic *apic)
{
u32 timer_mode = kvm_apic_get_reg(apic, APIC_LVTT) &
apic->lapic_timer.timer_mode_mask;
if (apic->lapic_timer.timer_mode != timer_mode) {
apic->lapic_timer.timer_mode = timer_mode;
hrtimer_cancel(&apic->lapic_timer.timer);
}
}
static void apic_timer_expired(struct kvm_lapic *apic)
{
struct kvm_vcpu *vcpu = apic->vcpu;
@ -1298,6 +1309,7 @@ static int apic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
apic_set_reg(apic, APIC_LVTT + 0x10 * i,
lvt_val | APIC_LVT_MASKED);
}
apic_update_lvtt(apic);
atomic_set(&apic->lapic_timer.pending, 0);
}
@ -1330,20 +1342,13 @@ static int apic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
break;
case APIC_LVTT: {
u32 timer_mode = val & apic->lapic_timer.timer_mode_mask;
if (apic->lapic_timer.timer_mode != timer_mode) {
apic->lapic_timer.timer_mode = timer_mode;
hrtimer_cancel(&apic->lapic_timer.timer);
}
case APIC_LVTT:
if (!kvm_apic_sw_enabled(apic))
val |= APIC_LVT_MASKED;
val &= (apic_lvt_mask[0] | apic->lapic_timer.timer_mode_mask);
apic_set_reg(apic, APIC_LVTT, val);
apic_update_lvtt(apic);
break;
}
case APIC_TMICT:
if (apic_lvtt_tscdeadline(apic))
@ -1576,7 +1581,7 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu)
for (i = 0; i < APIC_LVT_NUM; i++)
apic_set_reg(apic, APIC_LVTT + 0x10 * i, APIC_LVT_MASKED);
apic->lapic_timer.timer_mode = 0;
apic_update_lvtt(apic);
apic_set_reg(apic, APIC_LVT0,
SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT));
@ -1802,6 +1807,7 @@ void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu,
apic_update_ppr(apic);
hrtimer_cancel(&apic->lapic_timer.timer);
apic_update_lvtt(apic);
update_divide_count(apic);
start_apic_timer(apic);
apic->irr_pending = true;