Nicholas Lee
2005-Oct-05 10:18 UTC
[Xen-users] Xen 3.0 - dom0 with 32bit userland vs domU with 64bit userland?
Is there likely to be a problem with running a AMD64 64bit dom0 kernel with standard 32bit userland. Then running 64bit domU kernels with a mix 32, 64 or 32/64 bit userlands? I''m thinking that the above should just work, but if there are some gotcha''s I should be aware off it would save me some time in system development on this new v20z Xen system I''m building. Thanks, -- Nicholas Lee http://stateless.geek.nz gpg 8072 4F86 EDCD 4FC1 18EF 5BDD 07B0 9597 6D58 D70C _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Petersson, Mats
2005-Oct-05 10:25 UTC
RE: [Xen-users] Xen 3.0 - dom0 with 32bit userland vs domU with 64bit userland?
> -----Original Message----- > From: xen-users-bounces@lists.xensource.com > [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of > Nicholas Lee > Sent: 05 October 2005 11:18 > To: xen ml > Subject: [Xen-users] Xen 3.0 - dom0 with 32bit userland vs > domU with 64bit userland? > > Is there likely to be a problem with running a AMD64 64bit > dom0 kernel with standard 32bit userland. Then running 64bit > domU kernels with a mix 32, 64 or 32/64 bit userlands? > > I''m thinking that the above should just work, but if there > are some gotcha''s I should be aware off it would save me some > time in system development on this new v20z Xen system I''m building.That''s what I''d be thinking too, and I''m not aware of any gotcha''s in this area [somone else with more experience in this combo might be able to tell more]. For now [1], all kernels need to be the same bitness and PAE-ness, but the standard 64-bit kernel supports 32-bit apps, and that should just work, whether it''s on top of Xen or not shouldn''t make any difference. [1] Once virtualization HW becomes available, there will be a possibility of running a 64-bit Xen/Dom0 with 32-bit OS''s as guests. But at the moment, Virtualization hardware isn''t publicly available from either AMD or Intel. I don''t know what timescales this will be made available... -- Mats> > Thanks, > -- > Nicholas Lee > http://stateless.geek.nz > gpg 8072 4F86 EDCD 4FC1 18EF 5BDD 07B0 9597 6D58 D70C > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Nicholas Lee
2005-Oct-05 10:47 UTC
Re: [Xen-users] Xen 3.0 - dom0 with 32bit userland vs domU with 64bit userland?
On 10/5/05, Petersson, Mats <mats.petersson@amd.com> wrote:> at the moment, Virtualization hardware isn''t publicly available from > either AMD or Intel. I don''t know what timescales this will be made > available...Going to require a whole new hardware set as well, plus the burn in time while its tested before it becomes useful in production. Being able to mix 32 and 64 userlands is probably just as useful at the moment. Means I can run a well test solid 32bit userland dom0, and do all the flaky 64bit userland testing in reusable domUs. -- Nicholas Lee http://stateless.geek.nz gpg 8072 4F86 EDCD 4FC1 18EF 5BDD 07B0 9597 6D58 D70C _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Mark Williamson
2005-Oct-05 10:49 UTC
Re: [Xen-users] Xen 3.0 - dom0 with 32bit userland vs domU with 64bit userland?
> Is there likely to be a problem with running a AMD64 64bit dom0 kernel > with standard 32bit userland. Then running 64bit domU kernels with a > mix 32, 64 or 32/64 bit userlands?The only caveat (that I know of) is that the dom0 Xen tools need to be 64 bit (because they talk to 64bit Xen, which has a different ABI). This in turn means you''ll need a 64-bit python install, etc etc. A 64 bit dom0 userland might be easier from your PoV. 32 bit compatibility for normal userspace apps should work fine though, so running 32bit apps will usually be fine in either dom0 or domU. Cheers, Mark> I''m thinking that the above should just work, but if there are some > gotcha''s I should be aware off it would save me some time in system > development on this new v20z Xen system I''m building. > > Thanks, > -- > Nicholas Lee > http://stateless.geek.nz > gpg 8072 4F86 EDCD 4FC1 18EF 5BDD 07B0 9597 6D58 D70C > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Nicholas Lee
2005-Oct-05 10:52 UTC
Re: [Xen-users] Xen 3.0 - dom0 with 32bit userland vs domU with 64bit userland?
On 10/5/05, Mark Williamson <mark.williamson@cl.cam.ac.uk> wrote:> means you''ll need a 64-bit python install, etc etc. A 64 bit dom0 userland > might be easier from your PoV.That''s very useful to know. Without doubt saving me a few nights of pain. I guess I''ll go hunt out the amd64 sarge install cd now and do a reinstall. Thanks. -- Nicholas Lee http://stateless.geek.nz gpg 8072 4F86 EDCD 4FC1 18EF 5BDD 07B0 9597 6D58 D70C _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users