Re: [Xen-devel] [PATCH v5 6/9] libxc: create unmapped initrd in domain builder if supported

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 11/25/2015 11:18 AM, Wei Liu wrote:
> On Wed, Nov 25, 2015 at 11:12:12AM -0500, Boris Ostrovsky wrote:
> > On 11/12/2015 08:43 AM, Juergen Gross wrote:
> > > In case the kernel of a new pv-domU indicates it is supporting an
> > > unmapped initrd, don't waste precious virtual space for the initrd,
> > > but allocate only guest physical memory for it.
> > This patch breaks 32-bit pygrub.
> This particular patch?
>
> We discovered a bug in mini-os that caused 32-bit pygrub to break withi
> this series. It's now fixed in mini-os upstream.  Check Config.mk for
> mini-os commit that fixes the bug.
Yes, I was waiting for that patch because somehow I thought it was going 
to fix this. And it was unrelated.
> > I am not 100% sure yet but it may be that only 64-bit guests are affected.
> >
> > With RHEL5 I get
> >      initrd extends beyond end of memory (0x780080eda000 > 0x40000000)
> But this is different from what we found. We need more information.
>
> My wild guess is RHEL5 advertise it supports unmapped initrd but it was
> buggy in some way.
Maybe. Unfortunately RHEL5 is the only guest I have available to me 
right now that I can test with pygrub on 32 bit. I have others and they 
also fail but I am not convinced they fail because of this issue.
I was going to look some more at this but I am not sure how much I will 
be able to do before next Monday (it's Thanksgiving 4-day weekend in US) 
so I figured I'd post this now.
-boris

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