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KVM: in-kernel LAPIC save and restore support

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This patch adds a new vcpu-based IOCTL to save and restore the local
apic registers for a single vcpu. The kernel only copies the apic page as
a whole, extraction of registers is left to userspace side. On restore, the
APIC timer is restarted from the initial count, this introduces a little
delay, but works fine.

Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Qing He <qing.he@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Eddie Dong
2007-09-06 12:22:56 +03:00
committed by Avi Kivity
parent 6bf9e962d1
commit 96ad2cc613
4 changed files with 68 additions and 0 deletions
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13
drivers/kvm/lapic.c
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@@ -931,3 +931,16 @@ int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
apic_clear_irr(vector, apic);
return vector;
}
void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic = vcpu->apic;
apic->base_address = vcpu->apic_base &
MSR_IA32_APICBASE_BASE;
apic_set_reg(apic, APIC_LVR, APIC_VERSION);
apic_update_ppr(apic);
hrtimer_cancel(&apic->timer.dev);
update_divide_count(apic);
start_apic_timer(apic);
}