From 97222cc8316328965851ed28d23f6b64b4c912d2 Mon Sep 17 00:00:00 2001 From: Eddie Dong Date: Wed, 12 Sep 2007 10:58:04 +0300 Subject: KVM: Emulate local APIC in kernel Because lightweight exits (exits which don't involve userspace) are many times faster than heavyweight exits, it makes sense to emulate high usage devices in the kernel. The local APIC is one such device, especially for Windows and for SMP, so we add an APIC model to kvm. It also allows in-kernel host-side drivers to inject interrupts without going through userspace. [compile fix on i386 from Jindrich Makovicka] Signed-off-by: Yaozu (Eddie) Dong Signed-off-by: Qing He Signed-off-by: Avi Kivity --- drivers/kvm/irq.c | 53 ++++++++++++++++++++++++++++++++++++----------------- 1 file changed, 36 insertions(+), 17 deletions(-) (limited to 'drivers/kvm/irq.c') diff --git a/drivers/kvm/irq.c b/drivers/kvm/irq.c index b08005ca7050..0b4430a0cae0 100644 --- a/drivers/kvm/irq.c +++ b/drivers/kvm/irq.c @@ -30,14 +30,13 @@ */ int kvm_cpu_has_interrupt(struct kvm_vcpu *v) { - struct kvm_pic *s = pic_irqchip(v->kvm); - - if (s->output) /* PIC */ - return 1; - /* - * TODO: APIC - */ - return 0; + struct kvm_pic *s; + + if (kvm_apic_has_interrupt(v) == -1) { /* LAPIC */ + s = pic_irqchip(v->kvm); /* PIC */ + return s->output; + } + return 1; } EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt); @@ -46,16 +45,36 @@ EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt); */ int kvm_cpu_get_interrupt(struct kvm_vcpu *v) { - struct kvm_pic *s = pic_irqchip(v->kvm); + struct kvm_pic *s; int vector; - s->output = 0; - vector = kvm_pic_read_irq(s); - if (vector != -1) - return vector; - /* - * TODO: APIC - */ - return -1; + vector = kvm_get_apic_interrupt(v); /* APIC */ + if (vector == -1) { + s = pic_irqchip(v->kvm); + s->output = 0; /* PIC */ + vector = kvm_pic_read_irq(s); + } + return vector; } EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt); + +static void vcpu_kick_intr(void *info) +{ +#ifdef DEBUG + struct kvm_vcpu *vcpu = (struct kvm_vcpu *)info; + printk(KERN_DEBUG "vcpu_kick_intr %p \n", vcpu); +#endif +} + +void kvm_vcpu_kick(struct kvm_vcpu *vcpu) +{ + int ipi_pcpu = vcpu->cpu; + + if (vcpu->guest_mode) + smp_call_function_single(ipi_pcpu, vcpu_kick_intr, vcpu, 0, 0); +} + +void kvm_ioapic_update_eoi(struct kvm *kvm, int vector) +{ + /* TODO: for kernel IOAPIC */ +} -- cgit v1.2.1