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KVM: Accelerated apic support

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This adds a mechanism for exposing the virtual apic tpr to the guest, and a
protocol for letting the guest update the tpr without causing a vmexit if
conditions allow (e.g. there is no interrupt pending with a higher priority
than the new tpr).

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2007-10-25 16:52:32 +02:00
parent b209749f52
commit b93463aa59
5 changed files with 120 additions and 1 deletions
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51
arch/x86/kvm/lapic.c
View file

@ -815,7 +815,8 @@ void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8)
if (!apic)
return;
apic_set_tpr(apic, ((cr8 & 0x0f) << 4));
apic_set_tpr(apic, ((cr8 & 0x0f) << 4)
| (apic_get_reg(apic, APIC_TASKPRI) & 4));
}
u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
@ -1104,3 +1105,51 @@ void kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
hrtimer_start(timer, timer->expires, HRTIMER_MODE_ABS);
}
EXPORT_SYMBOL_GPL(kvm_migrate_apic_timer);
void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu)
{
u32 data;
void *vapic;
if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
return;
vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0);
data = *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr));
kunmap_atomic(vapic, KM_USER0);
apic_set_tpr(vcpu->arch.apic, data & 0xff);
}
void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu)
{
u32 data, tpr;
int max_irr, max_isr;
struct kvm_lapic *apic;
void *vapic;
if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
return;
apic = vcpu->arch.apic;
tpr = apic_get_reg(apic, APIC_TASKPRI) & 0xff;
max_irr = apic_find_highest_irr(apic);
if (max_irr < 0)
max_irr = 0;
max_isr = apic_find_highest_isr(apic);
if (max_isr < 0)
max_isr = 0;
data = (tpr & 0xff) | ((max_isr & 0xf0) << 8) | (max_irr << 24);
vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0);
*(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr)) = data;
kunmap_atomic(vapic, KM_USER0);
}
void kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr)
{
if (!irqchip_in_kernel(vcpu->kvm))
return;
vcpu->arch.apic->vapic_addr = vapic_addr;
}