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Re: [Qemu-devel] [PATCH 2/2 V7] qemu,qmp: add inject-nmi qmp command

From: Blue Swirl
Subject: Re: [Qemu-devel] [PATCH 2/2 V7] qemu,qmp: add inject-nmi qmp command
Date: Fri, 8 Apr 2011 22:17:20 +0300

On Fri, Apr 8, 2011 at 9:04 AM, Gleb Natapov <address@hidden> wrote:
> On Thu, Apr 07, 2011 at 04:41:03PM -0500, Anthony Liguori wrote:
>> On 04/07/2011 02:17 PM, Gleb Natapov wrote:
>> >On Thu, Apr 07, 2011 at 10:04:00PM +0300, Blue Swirl wrote:
>> >>On Thu, Apr 7, 2011 at 9:51 PM, Gleb Natapov<address@hidden>  wrote:
>> >>
>> >>I'd prefer something more generic like these:
>> >>raise /address@hidden:l1int
>> >>lower /i44FX-pcihost/address@hidden/pinD
>> >>
>> >>The clumsier syntax shouldn't be a problem, since this would be a
>> >>system developer tool.
>> >>
>> >>Some kind of IRQ registration would be needed for this to work without
>> >>lots of changes.
>> >True. The ability to trigger any interrupt line is very useful for
>> >debugging. I often re-implement it during debug.
>> And it's a good thing to have, but exposing this as the only API to
>> do something as simple as generating a guest crash dump is not the
>> friendliest thing in the world to do to users.
> Well, this is not intended to be used by regular users directly and
> management can provide nicer interface for issuing NMI. But really,
> my point is that NMI actually generates guest core dump in such rare
> cases (only preconfigured Windows guests) that it doesn't warrant to
> name command as such. Management is in much better position to implement
> functionality with such name since it knows what type of guest it runs
> and can tell agent to configure guest accordingly.

Does the management need to know about each and every debugging
oriented interface? For example, "info regs",  "info mem", "info irq"
and tracepoints?

I think giving IRQs symbolic names could solve some other problems as
well. Maybe it should be possible to connect IRQs in a configuration
file and even with command line:
-device port90,irqid=p90out -device pckbd,irqid=kbdout -device
and,in=p90out,in=kbdout,out=sreset device system_reset,in=sreset



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