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Commit db324fe6 authored by Nadav Amit's avatar Nadav Amit Committed by Paolo Bonzini
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KVM: x86: Warn on APIC base relocation 



APIC base relocation is unsupported by KVM. If anyone uses it, the least should
be to report a warning in the hypervisor.

Note that KVM-unit-tests uses this feature for some reason, so running the
tests triggers the warning.

Signed-off-by: default avatarNadav Amit <namit@cs.technion.ac.il>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent d14cb5df

arch/x86/kvm/lapic.c

+4 −0
Original line number Diff line number Diff line
@@ -1457,6 +1457,10 @@ void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value) 
	apic->base_address = apic->vcpu->arch.apic_base &

			     MSR_IA32_APICBASE_BASE;



	if ((value & MSR_IA32_APICBASE_ENABLE) &&

	     apic->base_address != APIC_DEFAULT_PHYS_BASE)

		pr_warn_once("APIC base relocation is unsupported by KVM");



	/* with FSB delivery interrupt, we can restart APIC functionality */

	apic_debug("apic base msr is 0x%016" PRIx64 ", and base address is "

		   "0x%lx.\n", apic->vcpu->arch.apic_base, apic->base_address);