Currently the code kzalloc()s new VCPUs instead of using the kmem_cache
which is created when KVM is initialized.

Modify it to allocate VCPUs from that kmem_cache.
Signed-off-by: NSasha Levin <levinsasha928@gmail.com>
Acked-by: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NAlexander Graf <agraf@suse.de>
Signed-off-by: NAvi Kivity <avi@redhat.com>