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KVM: nVMX: Support direct APIC access from L2 

It's a pathological case, but still a valid one: If L1 disables APIC
virtualization and also allows L2 to directly write to the APIC page, we
have to forcibly enable APIC virtualization while in L2 if the in-kernel
APIC is in use.

This allows to run the direct interrupt test case in the vmx unit test
without x2APIC.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jan Kiszka 2013-12-16 12:55:46 +01:00 committed by Paolo Bonzini
parent 9357d93952
commit ca3f257ae5
1 changed files with 5 additions and 0 deletions
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5
arch/x86/kvm/vmx.c
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@ -7763,6 +7763,11 @@ static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
else
vmcs_write64(APIC_ACCESS_ADDR,
page_to_phys(vmx->nested.apic_access_page));
} else if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm)) {
exec_control |=
SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
vmcs_write64(APIC_ACCESS_ADDR,
page_to_phys(vcpu->kvm->arch.apic_access_page));
}
vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);