Re: EPS Signature

[Keir Fraser <Keir.Fraser@cl.cam.ac.uk>]

It doesn't appear obviously incorrect.

 K.


On 12/2/07 02:36, "Kaushik Barde" <Kaushik_Barde@Phoenix.com> wrote:

> 
> 
> But is the usage HYPERVISOR_update_descriptor(...) appropriate?
> 
> -Kaushik
> 
> -----Original Message-----
> From: Keir Fraser [mailto:Keir.Fraser@cl.cam.ac.uk]
> Sent: Sunday, February 11, 2007 4:58 PM
> To: Kaushik Barde; Ian Pratt; Xen devel list
> Subject: Re: [Xen-devel] EPS Signature
> 
> On 11/2/07 23:39, "Kaushik Barde" <Kaushik_Barde@Phoenix.com> wrote:
> 
>> gdt_table  = get_cpu_gdt_table(cpu);
>> l_entry_ma = virt_to_bus(&(gdt_table[l_Request.entryNum]));
>> l_desc_64  = *( (u64 *) &l_Desc);
> 
> This should be fine, assuming gdt_table is a normal kernel virtual
> address
> (e.g., returned by kmalloc()). I/O memory is a different matter in Xen,
> in
> that virt_to_bus() won't work. In fact the same restriction holds in
> native
> Linux as well (I/O memory shouldn't be virt_to_bus()ed).
> 
>  -- Keir
> 
>