KVM: perform an invalid memslot step for gpa base change

PPC must flush all translations before the new memory slot
is visible.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
static unsigned long gfn_to_hva_read(struct kvm *kvm, gfn_t gfn)
{
	return __gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL, false);
}

static unsigned long gfn_to_hva_read(struct kvm *kvm, gfn_t gfn)
{
	return __gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL, false);
}
