Re: [Xen-devel] [RFC PATCH 14/16]: PVH xen: add xenmem_add_foreign_to_pmap()

[Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>]

On Mon, 11 Feb 2013 18:18:24 -0800
Mukesh Rathor <mukesh.rathor@xxxxxxxxxx> wrote:

> On Thu, 24 Jan 2013 17:31:18 +0000
> Tim Deegan <tim@xxxxxxx> wrote:
> 
> > At 18:11 -0800 on 11 Jan (1357927863), Mukesh Rathor wrote:
> > 
> > > +    /* qemu, running on PVH dom0, mapping hvm domain's io pages
> > > during domain 
> > > +     * creation, doesn't have mfns in the HAP table */
> > > +    if ( !mfn_valid(mfn) && p2m_is_mmio(p2mt) ) {
> > 
> > This test should be for == p2m_mmio_direct; we don't want to try
> > mapping p2m_mmio_dm areas.
> 
> Yup. Done.

No, qemu is changing the mem type for these pages, so I need to dig
into understanding what it's trying to do there. But the above, I don't
think is correct. Xen returns p2m type of dm, but I don't think I'm
looking at right mfn's here for this qemu special case. Basically, it's
during hvm guest creation on PVH dom0 that qemu accesses some addresses
that are not mapped.

Anyways, I hope to figure whats going on in qemu soon.

thanks,
Mukesh

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