[Xen-devel] Re: xsm: Consolidate xsm processing within domain control hypercall.

["Mike D. Day" <ncmike@xxxxxxxxxx>]

On 04/12/07 16:54 -0500, George S. Coker, II wrote:
> 
> > 
> >> 2) This will also impose on the security modules the responsibility to
> >> acquire and hold locks on hypervisor resources.  It would seem dangerous to
> >> give modules this responsibility.
> > 
> > I don't see it, the locking logic is still the same. Can you show me
> > where the module needs to acquire locks differently than without the
> > patch?
> > 
> It's not that the locking logic is different.  A security module may be
> sloppy about its locking and cause Xen to crash without specifically
> indicating a flaw in the security module.
> 
> Getting locks right is tricky business, it would seem the Xen would want the
> responsibility for the locking of resources to avoid the ills of race
> conditions, etc.

I agree with your comments, but I don't think the patch changes
locking at all. If I'm wrong I agree that's a problem. 

Mike

-- 
Mike D. Day
IBM LTC
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