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Re: [Xen-devel] Hypercalls in Intel-VT

  • To: xen-devel@xxxxxxxxxxxxxxxxxxx
  • From: "Ashish Bijlani" <ashish.bijlani@xxxxxxxxx>
  • Date: Thu, 25 Oct 2007 21:13:39 -0400
  • Delivery-date: Thu, 25 Oct 2007 18:14:39 -0700
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  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
how does dom0 on intel-vt gets privileges to access the hardware devices? i mean does it get these privileges through superpages?

On 10/25/07, Cui, Dexuan <dexuan.cui@xxxxxxxxx> wrote:
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Ashish Bijlani
> Sent: 2007年10月26日 8:20
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] Hypercalls in Intel-VT

>
> could there be a way to make a transition into xen without a vmexit upon executing an iret inside a guest os krnl?
I think we are talking about VMX guest -- the answer it NO...  For an VMX guest to return to Xen, a VMexit is a must. You can refert to Intel Software Developer Manual 3B for details.

-- Dexuan



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