From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: (v2) Design proposal for RMRR fix
Date: Wed, 14 Jan 2015 15:42:45 -0500
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To: "Tian, Kevin" <kevin.tian@intel.com>
Cc: "wei.liu2@citrix.com" <wei.liu2@citrix.com>, "ian.campbell@citrix.com" <ian.campbell@citrix.com>, "stefano.stabellini@eu.citrix.com" <stefano.stabellini@eu.citrix.com>, George Dunlap <George.Dunlap@eu.citrix.com>, "ian.jackson@eu.citrix.com" <ian.jackson@eu.citrix.com>, "tim@xen.org" <tim@xen.org>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>, Jan Beulich <JBeulich@suse.com>, "Zhang,
	Yang Z" <yang.z.zhang@intel.com>, "Chen, Tiejun" <tiejun.chen@intel.com>
List-Id: xen-devel@lists.xenproject.org

On Wed, Jan 14, 2015 at 08:13:14AM +0000, Tian, Kevin wrote:
> > From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@oracle.com]
> > Sent: Wednesday, January 14, 2015 12:46 AM
> > 
> > 
> > Perhaps an easier way of this is to use the existing
> > mechanism we have - that is the XENMEM_memory_map (which
> > BTW e820_host uses). If all of this is done in the libxl (which
> > already does this based on the host E820, thought it can
> > be modified to query the hypervisor for other 'reserved
> > regions') and hvmloader is modified to use XENMEM_memory_map
> > and base its E820 on that (and also QEMU-xen), then we solve
> > this problem and also the http://bugs.xenproject.org/xen/bug/28?
> > 
> 
> I'm not familiar with that option, but a quick search looks saying
> it's only for PV guest?

It was originally for PV, but the hypercall can be executed under
HVM now too (thanks for PVH patches).
> 
> and please note XENMEM_memory_map only includes RAM entries
> (looks also only for pv), while following above intention what we
> really want is real e820_host w/ all entries filled.

It includeds whatever we want to put in there. It can have
RAM, RSV, etc. That is what  e820_host does for PV guests - it fills
it out with an E820 that looks like the real thing.

> 
> Thanks
> Kevin