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Re: [Xen-devel] No P2M mapping == pagetype == XEN_DOMCTL_PFINFO_XTAB?


  • To: Mike Sun <msun@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
  • Date: Mon, 29 Sep 2008 18:53:35 +0100
  • Cc:
  • Delivery-date: Mon, 29 Sep 2008 10:53:54 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AckiXEsniamVtY5PEd2xvgAWy6hiGQ==
  • Thread-topic: [Xen-devel] No P2M mapping == pagetype == XEN_DOMCTL_PFINFO_XTAB?

If the top nibble is set (i.e, XEN_..._XTAB) then indeed there is no memory
page at that pseudophysical address. It could become populated later (by
XENMEM_populate_physmap for example).

 -- Keir

On 29/9/08 18:35, "Mike Sun" <msun@xxxxxxxxxx> wrote:

> For an HVM domain, if a given pfn has a pagetype of
> XEN_DOMCTL_PFINFO_XTAB as returned by xc_map_foreign_batch(), does
> this mean that pfn is not not in the HVM guest's pseudo-physical
> map/have a valid P2M entry?
> 
> I'm having difficulty understanding page types for HVM domains.  If a
> pfn for an HVM domain is of the type XEN_DOMCTL_PFINFO_XTAB, can it
> later become a valid page?  And what about the reverse case?
> 
> Any help would be much appreciated, thanks,
> Mike
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel



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