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Re: [Xen-devel] do_update_va_mapping_otherdomain()

  • To: Jan Beulich <jbeulich@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Keir Fraser <keir@xxxxxxxxxxxxx>
  • Date: Wed, 14 Mar 2007 15:54:38 +0000
  • Delivery-date: Wed, 14 Mar 2007 08:53:59 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcdmURHHUJG69tJEEdu8zgAX8io7RQ==
  • Thread-topic: [Xen-devel] do_update_va_mapping_otherdomain()

On 14/3/07 13:23, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

> Isn't this hypercall broken, and should thus be removed as it is entirely
> unused, or alternatively be fixed? do_update_va_mapping() completely
> deals with current->domain in all respects, and guest_{,un}map_l1e()
> seem to also depend on dealing with current.

The hypercall is supposed to operate on the local address space, but map a
foreign page. It calls mod_l1_entry() which should refer to the foreign
domain when it obtains a reference to the page being mapped.

 -- Keir

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