Re: Vanilla Linux 64-bit paravirt guest support

[Jeremy Fitzhardinge <jeremy@goop.org>]

Michael Abd-El-Malek wrote:
> On Apr 10, 2008, at 10:11 AM, Mark McLoughlin wrote:
>> On Thu, 2008-04-10 at 09:01 -0500, Jeremy Fitzhardinge wrote:
>>> Michael Abd-El-Malek wrote:
>>>> Is 64-bit domU support available anywhere at the moment?  For example,
>>>> what is the status of the git://git.et.redhat.com/xen-pvops-64.git
>>>> tree?  I pulled that tree and tried building 64-bit Xen domU support
>>>> (since this tree allows you to configure the kernel with that
>>>> capability, unlike the vanilla Linux tree).  But compilation failed in
>>>> enlighten.c because xen_smp_ops isn't defined in x86_64.
>>
>> Try building without CONFIG_SMP, it doesn't support that yet.
>
> Other than SMP support, does the tree represent a fully functional 
> 64-bit PV domU support? Does it also allow all hypercalls?  Put 
> another way: is a 64-bit PV domU from that tree less capable than a 
> 64-bit PV domU from Xen's linux-2.6.18.8 tree?

The 32-bit domU implementation is less capable than 2.6.18-xen.  For 
example, it does not yet support suspend/resume/migrate or ballooning, 
and a number of interesting features are not yet in a released kernel 
(pvfb).  Further out I hope we'll get things like dom0 support in as well.

(I'm not sure what you mean by "allow all hypercalls"; do you mean "all 
features"?)

    J