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Re: [Xen-devel] [PATCH] x86: clear guest's EFLAGS.RF after emulating instructions


  • To: Jan Beulich <jbeulich@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
  • Date: Tue, 19 Jun 2007 10:59:55 +0100
  • Delivery-date: Tue, 19 Jun 2007 02:58:00 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AceyWJYw1PSoyh5LEdyOfAAX8io7RQ==
  • Thread-topic: [Xen-devel] [PATCH] x86: clear guest's EFLAGS.RF after emulating instructions

On 19/6/07 10:53, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

You set EFLAGS.RF in a few places when injecting #PF. Why would you do that?
It isn't Xen's job to set that flag ever afaics, and since the original trap
into Xen was not due to #DB you're not avoiding an infinite loop.

 -- Keir



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