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| author | Eddie Dong <eddie.dong@intel.com> | 2007-09-06 12:22:56 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2007-10-13 10:18:25 +0200 |
| commit | 96ad2cc6132479aa0aea485d0838a13fda765bd5 (patch) | |
| tree | dc3596b92981332cee0749004b7076a7d52a90b1 /drivers/kvm/lapic.c | |
| parent | 6bf9e962d14deb9e460afbbfd83ea2f450325c2d (diff) | |
| download | lwn-96ad2cc6132479aa0aea485d0838a13fda765bd5.tar.gz lwn-96ad2cc6132479aa0aea485d0838a13fda765bd5.zip | |
KVM: in-kernel LAPIC save and restore support
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>
Diffstat (limited to 'drivers/kvm/lapic.c')
| -rw-r--r-- | drivers/kvm/lapic.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/kvm/lapic.c b/drivers/kvm/lapic.c index 4b5c77d8900d..df636bf19798 100644 --- a/drivers/kvm/lapic.c +++ b/drivers/kvm/lapic.c @@ -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); +} |