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x86, apicv: add APICv register virtualization support

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- APIC read doesn't cause VM-Exit
- APIC write becomes trap-like

Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Yang Zhang
2013-01-25 10:18:49 +08:00
committed by Gleb Natapov
parent d47510e295
commit 83d4c28693
4 changed files with 51 additions and 1 deletions
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15
arch/x86/kvm/lapic.c
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@@ -1212,6 +1212,21 @@ void kvm_lapic_set_eoi(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_lapic_set_eoi);
/* emulate APIC access in a trap manner */
void kvm_apic_write_nodecode(struct kvm_vcpu *vcpu, u32 offset)
{
u32 val = 0;
/* hw has done the conditional check and inst decode */
offset &= 0xff0;
apic_reg_read(vcpu->arch.apic, offset, 4, &val);
/* TODO: optimize to just emulate side effect w/o one more write */
apic_reg_write(vcpu->arch.apic, offset, val);
}
EXPORT_SYMBOL_GPL(kvm_apic_write_nodecode);
void kvm_free_lapic(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic = vcpu->arch.apic;