cpuid eax should return the max leaf so that
guests can find out the valid range.
This matches Xen et al.
Update documentation to match.

Tested with -cpu host.
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

  cd Documentation
  mkdir virtual
  git mv kvm uml lguest virtual
Signed-off-by: NRob Landley <rlandley@parallels.com>
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>

Guest enables async PF vcpu functionality using this MSR.
Reviewed-by: NRik van Riel <riel@redhat.com>
Signed-off-by: NGleb Natapov <gleb@redhat.com>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>

This file documents cpuid bits used by KVM.
Signed-off-by: NGlauber Costa <glommer@redhat.com>
Acked-by: NZachary Amsden <zamsden@redhat.com>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>