Re: Vanilla Linux 64-bit paravirt guest support

[Mark McLoughlin <markmc@redhat.com>]

On Thu, 2008-04-10 at 15:11 +0100, 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.
> 
> > Redhat have some patches which they're shipping in Fedora 9.  Once F9 is 
> > out the door, I'm hoping they'll polish them into an upstreamable form.  
> > I don't know whether that git tree represents what's in F9, or if that's 
> > somewhere else; at the very least I'd expect you'd be able to pull the 
> > patches out of the srpm.
> 
> Yep, this tree:
> 
>   http://git.et.redhat.com/?p=xen-pvops-64.git
> 
> is the work-in-progress x86_64 tree.

FYI, here's the config options that's currently needed to get this tree
working:

# CONFIG_SMP is not set
# CONFIG_NUMA is not set
# CONFIG_NEED_MULTIPLE_NODES is not set

# x86_64 breaks with a different CONFIG_PHYSICAL_START, currently
CONFIG_PHYSICAL_START=0x200000

# x86_64 breaks with CONFIG_SPARSEMEM_VMEMMAP, currently
# CONFIG_SPARSEMEM_VMEMMAP is not set

# 32-bit emulation isn't ready yet
# CONFIG_IA32_EMULATION is not set

Cheers,
Mark.