[Qemu-devel] Patch: generate double and triple faults

[Bernhard Kauer]

On Wed, Mar 28, 2007 at 02:39:31PM +0200, Bernhard Kauer wrote:
> On Wed, Mar 28, 2007 at 10:13:49AM +0200, Sebastian Kaliszewski wrote:
> > Bernhard Kauer wrote:
> > >Qemu does not generate a double fault (DBF) on x86, if a general protection
> > >fault could not be delivered. Instead it hangs in a loop.
> > >
> > >The patch fix this bug by checking whether we are already in a GPF 
> > >exception.
> > 
> > If you're at it, maybe add triple fault handling (ie exception if DBF 
> > handler) -- it should reset CPU.
> 
> There are many things missing in the x86 exception handling. For example
> the case PF -> PF is also not handled.

The attached patch implements double andd triple fault handling and makes
the last patch obsolete. It does not generate a reset on triple fault, but
it aborts qemu. The same happen currently if the TSS is bogous.


Greetings,

    Bernhard Kauer

qemu_exceptions.diff
Description: Text document