Re: Implement generic double fault generation mechanism

[Gleb Natapov <gleb@redhat.com>]

On Fri, May 08, 2009 at 06:46:14PM +0800, Dong, Eddie wrote:
> Dong, Eddie wrote:
> > ction will be re-executed.
> >>> 
> >>> Do you want it to be covered for now? For exception, it is easy but
> >>> for IRQ, it needs to be pushed back.
> >>> 
> >> Yes I want it to be covered now otherwise any serial exception
> >> generates flood of "Exception happens serially" messages. This
> >> function does not handle IRQ so no problem there.
> > 
> > But we soon will let this function cove IRQ as well per SDM.
> > Why not do that a little bit later?
> > 
> > BTW, this issue exist in original code as well.
> > 
> > Eddie
> 
> Actually this is already addressed in current patch too: Just keep the former exception. If you mean the prink should be removed, I am fine. 
Keeping the former exception is not the right thing to do. It can't be
delivered because delivering it cause another exception and handler that
may fix the situation is not called since you drop last exception and
keep re-injecting the one that can't be handled.

> BTW, this case doesn't happen in reality.
> 
Then why do you write all this code then? :) I can easily write test
case that will do that (actually I did) and if not handled properly it
just loops taking 100% cpu trying to reinject exception that cannot be
handled.

--
			Gleb.