Re: [Xen-devel] Privilege levels in xenolinux

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 8 Nov 2005, at 05:23, Purav Saraiya wrote:

> The following assembly code is used to set the Descriptors in 
> xenolinux.
> Theoretically, for xenolinux we have Descriptor privilege level(DPL) = 
> 1
> for all its descriptors. But from the instruction,
>
>         "movb %4,5(%2)\n\t"  (with the parameter, type =0x82 and 0x89)
> it seems that the DPL is set to 0.
>
> How is this possible. Dont we have xenolinux running at privilege 
> level 1?
> Am I going wrong somewhere?
That's dead code in Xen Linux. We set up LDTs via an explicit 
hypercall, not via LLDT.
 -- Keir


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