tree bf8b7b9e5fbe9f57d8f2e6cdd99db3b7109d350d
parent 4d395762599dbab1eb29d9011d5b75ca3cc4f70a
author Oliver Upton <oupton@google.com> 1582880344 -0800
committer Paolo Bonzini <pbonzini@redhat.com> 1584377855 +0100

KVM: SVM: Inhibit APIC virtualization for X2APIC guest

The AVIC does not support guest use of the x2APIC interface. Currently,
KVM simply chooses to squash the x2APIC feature in the guest's CPUID
If the AVIC is enabled. Doing so prevents KVM from running a guest
with greater than 255 vCPUs, as such a guest necessitates the use
of the x2APIC interface.

Instead, inhibit AVIC enablement on a per-VM basis whenever the x2APIC
feature is set in the guest's CPUID.

Signed-off-by: Oliver Upton <oupton@google.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>