Re: [Xen-devel] Vanilla Linux 64-bit paravirt guest support

[Michael Abd-El-Malek <mabdelmalek@xxxxxxx>]

On Apr 10, 2008, at 10:57 AM, Jeremy Fitzhardinge wrote:
> 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.
For my purposes, suspend/resume/migrate isn't required.  But I might  
need ballooning.  Would I be able to take the balloon driver from  
2.6.18.8 and use it in those new trees?  The new tree seems to have  
all the hypercalls and defines the increase_reservation/ 
decrease_reservation op codes.  I can add the stub code for these calls.
> (I'm not sure what you mean by "allow all hypercalls"; do you mean  
> "all features"?)
I was thinking along the lines of grant hypercalls for mapping another  
domU's grants.  HVM can't let me do that.  But I need to be able to do  
this for my work.
Thanks,
Mike

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