On Wed, 2011-08-03 at 11:26 +0300, Avi Kivity wrote: > On 08/03/2011 01:15 AM, Richard Henderson wrote: > > On 08/02/2011 03:06 PM, Avi Kivity wrote: > > > I don't think there's any cpu which has a real 64-bit physical > > > address space? Don't they all truncate it? > > > > I don't know. You're right that x86_64 does, at 48 bits. > > The alpha system I'm trying to emulate does, at 50 bits. > > > > I guess if IBM agrees wrt p-series and z-series emulation, then > > I'd be ok, so long as you add a comment above that structure that > > says no existing hw implementation actually uses 63 address bits. > > Ben, can you confirm that pseries physical addresses are 63 bits wide or > smaller? > > IIRC zseries has no mmio, and Zettabyte machines are still rare. We are fine yes. We might grow to 50 bits but I doubt we'll ever do the full 64, especially since we have some hard-wired assumptions that in real mode (MMU off) the top 2 bits are ignored. Cheers, Ben. -- 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
