On Fri, Dec 21, 2018 at 12:04:49PM -0500, Michael S. Tsirkin wrote: > On Sat, Dec 22, 2018 at 12:09:44AM +0800, Yu Zhang wrote: > > Well, my understanding of the vt-d spec is that the address limitation in > > DMAR are referring to the same concept of CPUID.MAXPHYSADDR. I do not think > > there's any different in the native scenario. :) > > I think native machines exist on which the two values are different. > Is that true?
I think the answer is not. My understanding is that HAW(host address wdith) is the maximum physical address width a CPU can detects(by cpuid.0x80000008). I agree there are some addresses the CPU does not touch, but they are still in the physical address space, and there's only one physical address space... B.R. Yu
