[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-users] dom0 32 bits and domU 64 bits
ï
No, definitely not. In HVM (full virtualization with hardware support
like AMD-V and Intel VT) you can run "smaller on bigger", and there is work
going on to allow that in Para-virtual (i.e. non-HVM) domains too - but don't
expect that to turn up for another several weeks, I'd say.
The main reason for this is that the Xen hypervisor needs to be able to
access all the CPU registers of the guest - since there's no guarantee that data
needed by Xen is in the "lower 8" registers that are available in 32-bit mode.
On top of that, you have the problem that 64-bit uses 4-level page-tables, which
needs to be understood (and accessed) by the Xen hypervisor. Although this is
technically possible in 32-bit mode, the code isn't written for this mode of
operation (although from a programming standpoint, it would be easier to solve
this than the register access, which technically a more challenging scenario).
--
Mats
_______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
|
Lists.xenproject.org is hosted with RackSpace, monitoring our |