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Re: [Qemu-ppc] [PATCH 3/4] Watchdog exit handling support

From: Scott Wood
Subject: Re: [Qemu-ppc] [PATCH 3/4] Watchdog exit handling support
Date: Thu, 5 Jul 2012 20:18:25 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120615 Thunderbird/13.0.1

On 07/05/2012 08:16 PM, Bhushan Bharat-R65777 wrote:
>> -----Original Message-----
>> From: Wood Scott-B07421
>> Sent: Friday, July 06, 2012 6:30 AM
>> To: Bhushan Bharat-R65777
>> Cc: Wood Scott-B07421; address@hidden; address@hidden;
>> address@hidden
>> Subject: Re: [PATCH 3/4] Watchdog exit handling support
>> On 07/05/2012 07:43 PM, Bhushan Bharat-R65777 wrote:
>>> Your initial comment was "We should probably call this function before
>>> returning to KVM". Which suggest that ioctls calls made by QEMU to
>>> enter KVM. I am a bit confused, now you want to avoid long delays in
>>> QEMU? This suggest whenever we exit to qemu, right?
>> Whenever we exit to QEMU is one possibility, though it's probably too 
>> aggressive
>> (if the guest gets stuck in a loop that contains a QEMU exit, the watchdog 
>> won't
>> catch it).  Another option is to reset the state machine only when the guest
>> resumes from a debug halt.
> Ok.
> Resetting the state machine does not disable watchdog, it will just
> ensure the longest time for debug halt etc. Is that ok ?

I'm talking about TSR, not TCR.  It's not about disabling the watchdog
or changing the period, but clearing any event that has happened when
leaving debug halt.


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