CC’ing the KVM mailing list which I forgot. On Aug 20, 2014, at 11:12 AM, Nadav Amit <[email protected]> wrote:
> 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 performs > APIC base relocation, and causes the warning to be printed. > > Signed-off-by: Nadav Amit <[email protected]> > --- > arch/x86/kvm/lapic.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c > index 08e8a89..6655e20 100644 > --- a/arch/x86/kvm/lapic.c > +++ b/arch/x86/kvm/lapic.c > @@ -1416,6 +1416,11 @@ 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) > + printk_once(KERN_WARNING > + "APIC base relocation is unsupported by KVM\n"); > + > /* 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); > -- > 1.9.1 >
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