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Re: [Xen-devel] Question about xc_translate_foreign_address()

  • To: AP Xen <apxeng@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Keir Fraser <keir.xen@xxxxxxxxx>
  • Date: Wed, 25 May 2011 07:16:52 +0100
  • Cc:
  • Delivery-date: Tue, 24 May 2011 23:18:04 -0700
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  • Thread-topic: [Xen-devel] Question about xc_translate_foreign_address()

On 25/05/2011 05:47, "AP Xen" <apxeng@xxxxxxxxx> wrote:

> I have a question about xc_translate_foreign_address(). When this call
> is issued for VCPU1 in a 2 VCPU guest where VCPU1 is in a paused state
> and VCPU0 is active, there is a possibility that VCPU0 could change
> the page tables that VCPU1 is using. There is a window where the
> function could return incorrect information. Is this true or there is
> something that prevents it from happening?

The assumption is that the whole domain is paused.

 -- Keir

> Thanks,
> AP
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