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Re: [Xen-devel] Native hypercall basics using int 82

  • To: hnrkssn hnrkssn <hnrkssn@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
  • Date: Tue, 16 Dec 2008 08:47:39 +0000
  • Cc:
  • Delivery-date: Tue, 16 Dec 2008 00:47:51 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AclfWvNHAAlpZbNrokq+CRSLQ9T8Ow==
  • Thread-topic: [Xen-devel] Native hypercall basics using int 82

On 16/12/2008 08:39, "hnrkssn hnrkssn" <hnrkssn@xxxxxxxxx> wrote:

> I'm trying to detect if I'm running as a guest in XEN hypervisor using a
> simple hypercall like __HYPERVISOR_xen_version with the XENVER_extraversion
> option.
> I cannot use any of the API functions for this so I'm trying to setup the
> required registers and call int 82 myself.
> This is what I do and unfortunately, it generates an exception 0xd when
> executing INT 82.
> Reading the source, I think I've figured out that I should put my arguments in
> a hypercall struct shown below. I might be wrong then.

See tools/misc/xen-detect.c for a nice approach that even works from user

 -- Keir

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