KVM: nVMX: fix canonical check of vmcs12 HOST_RIP

HOST_RIP canonical check should check the L1 of CR4.LA57 stored in
the vmcs12 rather than the current L1's because it is legal to change
the CR4.LA57 value during VM exit from L2 to L1.

This is a theoretical bug though, because it is highly unlikely that a
VM exit will change the CR4.LA57 from the value it had on VM entry.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Link: https://lore.kernel.org/r/20240906221824.491834-5-mlevitsk@redhat.com


Signed-off-by: Sean Christopherson <seanjc@google.com>