Re: [Xen-users] mem= not altering the total memory seen by Xen for ARM

[John Linn <john.linn@xxxxxxxxxx>]

> -----Original Message-----
> From: Julien Grall [mailto:julien.grall@xxxxxxx]
> Sent: Friday, August 12, 2016 6:12 AM
> To: John Linn <linnj@xxxxxxxxxx>; xen-users@xxxxxxxxxxxxx
> Cc: Terry O'Neal <terryo@xxxxxxxxxx>; Stefano Stabellini
> <sstabellini@xxxxxxxxxx>
> Subject: Re: [Xen-users] mem= not altering the total memory seen by Xen for
> ARM
> 
> 
> 
> On 09/08/2016 20:13, John Linn wrote:
> > Hi,
> 
> Hello John,
> 
> > I’m a newer user of Xen on ARM working with the Xilinx MPSOC platform.
> >  We want to restrict Xens available memory and the Xen command line
> > seems to be easy answer.
> >
> >
> >
> > We see the command line show mem=1G from “xl info”, but the
> > total_memory does not reflect what we set mem= to.
> >
> >
> >
> > Does this still work on ARM with device tree and we’re doing something
> > wrong?
> 
> The 'mem' option has not been implemented on ARM for moment. I think it was
> assumed that the user could modify the device tree to limit the memory.

Thanks Julien, we appreciate your help and all the work you guys do.

It would be really helpful if the user documentation reflected the 
implementation for ARM rather than the more general case where it's x86. Xen on 
ARM has a lot of potential and we want to see our customers successful with it.

I realize we can browse the source ourselves also and I'm starting to do that 
more, but it's not always obvious and our customers don't always want to do 
that. I also realize we can submit patches to help the documentation :)

Thanks
John

> 
> However, I know that sometimes it may be difficult to modify the device tree, 
> so
> it might be a good idea to implement "mem".
> 
> The best place to limit the memory in Xen would be setup_mm. Feel free to ask
> questions.
> 
> Regards,
> 
> --
> Julien Grall
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