[SeaBIOS] [PATCH v16] Add pvpanic device driver

Kevin O'Connor kevin at koconnor.net
Sat Mar 30 14:20:09 CET 2013

On Fri, Mar 29, 2013 at 02:49:12PM +0100, Paolo Bonzini wrote:
> Il 29/03/2013 14:33, Kevin O'Connor ha scritto:
> > On Fri, Mar 29, 2013 at 04:18:44PM +0800, Hu Tao wrote:
> >> pvpanic device is used to notify host(qemu) when guest panic happens.
> > 
> > Thanks.  However, we're planning a move of ACPI tables from SeaBIOS to
> > QEMU.  I think this should wait until after the move.
> The device should be in QEMU 1.5, and the SSDT probably will still be in
> SeaBIOS by then (and might even be the last to move, since it's quite
> complex and dynamic).  I don't think it is fair to block this patch on
> those grounds...

What is the user visible impact of not having a panic device?

My main concern is that the patch creates a new fw_cfg channel between
qemu and seabios thats sole purpose is to alter the OS visible ACPI
tables.  These types of QEMU->SeaBIOS interfaces are fragile and are
(in sum) quite complex.


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