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Re: [Qemu-devel] Change of max-ram-below-4g initial value breaks Xen

From: Gerd Hoffmann
Subject: Re: [Qemu-devel] Change of max-ram-below-4g initial value breaks Xen
Date: Fri, 24 Jun 2016 07:46:23 +0200

On Do, 2016-06-23 at 17:18 +0100, Anthony PERARD wrote:
> On Thu, Jun 23, 2016 at 04:57:54PM +0200, Gerd Hoffmann wrote:
> >   Hi,
> > 
> > > How could xen_ram_init() find out if the value of max-ram-below-4g is
> > > the default or if a user have set it? Is there another way we could fix
> > > this?
> > 
> > Attached patch should fix it.  Patch survived a quick smoke test on kvm
> > so far, need to do some more testing tomorrow.  Can you give it a spin
> > on xen?
> Thanks. Unfortunately, it does not work :(.
> In this patch, max_ram_below_4g is set before the call to xen_ram_init()
> and xen_ram_init read it back (via object_property_get_int()).  So, in
> xen_ram_init, user_lowmem is not 0.

Ah, I see.  We do the split calculation twice on xen.  That is pretty
pointless.  New patch attached.


Attachment: 0001-xen-fix-ram-init-regression.patch
Description: Text Data

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