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KVM: Emulate local APIC in kernel

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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 <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
2007-09-12 10:58:04 +03:00
committed by Avi Kivity
parent 7017fc3d1a
commit 97222cc831
9 changed files with 1066 additions and 32 deletions
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6
drivers/kvm/svm.c
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@ -573,6 +573,12 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
if (err)
goto free_svm;
if (irqchip_in_kernel(kvm)) {
err = kvm_create_lapic(&svm->vcpu);
if (err < 0)
goto free_svm;
}
page = alloc_page(GFP_KERNEL);
if (!page) {
err = -ENOMEM;