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RE: [Xen-devel] [PATCH] This patch fixes several issues related to vmxassist

  • To: "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>
  • From: "Li, Xin B" <xin.b.li@xxxxxxxxx>
  • Date: Fri, 31 Mar 2006 00:09:59 +0800
  • Cc: Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Thu, 30 Mar 2006 16:11:41 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcZUEewGkWLsj85KR2iFVpfU+gkXTgAAICqg
  • Thread-topic: [Xen-devel] [PATCH] This patch fixes several issues related to vmxassist

>Can you explain what was wrong with the function this patch changes, 
>and how the patch fixes that problem? The patch looks kludgy to me (as 
>far as I understand) -- apparently trying to differentiate between 
>real-mode and protected-mode segments? Why is that needed? Shouldn't 
>you be looking at the execution mode of the caller (e.g., EFLAGS.VM)?
>  -- Keir

Changeset 9366 from Leendert is to support big real mode, in turn to
so the address calculation is kludgy, the point here is to identify if a
cpu is in big real mode, if so, we should use protected mode addressing
even in real mode.


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