Re: [Qemu-devel] [PATCH 7/7] PPC64: Don't fault at lwsync

[Paul Brook]

On Thursday 05 March 2009, Alexander Graf wrote:
> Right now we can throw a fault on lwsync, even though the fault is
> actually caused by the instruction after lwsync.
>
> I haven't found the magic that messed this up, but for now we can
> just end the TB on lwsync, forcing the next command to issue faults
> itself.
>
> If anyone knows how to really fix this, please step forward and do
> so. This only makes things work at all for me :-).

Where is the subsequent fault coming from? I suspect the real bug is nothing 
to do with lwsync, and the subsequent fault is actually just corrupting the 
CPU state. As discussed recently this is the same bug SPARC has with its 
unassigned access handlers.

Paul