On Sat, Apr 11, 2009 at 03:25:19PM +0300, Avi Kivity wrote: > Andi Kleen wrote: > >>Right, but we can allocate the maximum number, no? it's a fairly small > >>amount of memory. > >> > > > >There are 255 banks worst case which need upto 4 (in theory 5) MSRs each > > > > > > That's 8KB, which would normally not be allocated. But I think we can > live with it. > > Do we actually need to support 255 banks? Probably not. Current CPUs all have a single digit number. e.g. 64 would be plenty for now. > Or can we support a smaller > number transparently? Not transparently. In theory software can hardcode that for cpu model X bank Y is available and does Z. Software doesn't have too, Intel provides a bank independent way to report errors too, but we don't know if everyone uses it. Linux doesn't rely on bank numbers on Intel at least. -Andi -- ak@xxxxxxxxxxxxxxx -- Speaking for myself only. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
