[Xen-devel] Re: [RFC] [PATCH] Dom0: Don't switch back to user space stack in syscall entry

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> Jeremy Fitzhardinge <jeremy@xxxxxxxx> 10.02.10 19:13 >>>
>> b) Add IST support to xen hypervisor, Considering the ptrace issue in 
>> http://lists.xensource.com/archives/html/xen-devel/2009-05/msg00200.html and 
>> also Ingo's comments in 
>> http://lkml.indiana.edu/hypermail/linux/kernel/0905.1/00087.html, maybe it 
>> still have value to add such support. But not sure if that is accepetable 
>> for xen hypervisor.
>>    
>
>That would depend on Keir's thoughts, which I would guess depend on what 
>the patch and ABI would look like.  It's certainly the most general 
>solution if it can be done in a reasonable way.

But if at all, I'd recommend considering a properly nesting solution
rather than just to mimic hardware behavior (since there's no IDT,
functionality needs to differ from native anyway).

Jan


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