RE: [PATCH] Allow xen to share device with domain (RE: [PATCH] RE:[Xen-ia64-devel] xencons interrupt problem)

[Alex Williamson <alex.williamson@xxxxxx>]

On Tue, 2006-07-04 at 09:49 +0800, Tian, Kevin wrote:
> Hi, Alex,
>       Could you try attached patch to see whether progressing a step 
> for you? It's made on top of last patch, to address a bug that 
> VEC_XEN_ALIAS is only meaningful when enable bit is on. This bug 
> may result guest to think shared irq line edge-triggered and thus no 
> EOI request is issued which may stuck the subsequent instances. :-)

Hi Kevin,

   Good catch with this patch, but it still hangs.  Besides having xen
call end() in __do_IRQ(), I can also prevent the hang by booting with
sync_console.  If I INIT the system when it's hung, the only CPU that's
not in the idle loop is sitting in do_console_io(), maybe into
guest_console_write() (which appears to be getting inlined).  I'm
wondering if the problem is actually Xen spinning there waiting for tx
space and preventing the guest from calling end().  I added a loop
counter for debug, but I haven't been able to make it pop out yet.
Thanks,

        Alex

-- 
Alex Williamson                             HP Open Source & Linux Org.


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