On 09/03/2015 20:19, Avi Kivity wrote: > I can't think of one with reasonable performance either. Perhaps the > maintainers could raise the issue with Intel. It looks academic but it > can happen in real life -- KVM for example used to rely on reserved bits > faults (it set all bits in the PTE so it wouldn't have been caught by > this). Yes, and it checked that MAXPHYADDR != 52 before. If you want to set only one bit, making that bit 51 makes sense anyway for simplicity, so it is still 99.9% academic. Once processors appear with MAXPHYADDR = 52, the remaining 0.1% will become more relevant. The current limit is IIRC 46 or 48 (on Haswell Xeons). Paolo -- 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
