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

[Wei Liu <wei.liu2@xxxxxxxxxx>]

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.

> 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.

Wei.

> 
> -boris

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