1 files changed, 4 insertions, 0 deletions

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index e7f7fc632a9b..344e7d36d0e8 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -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);