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From: Halil Pasic <pasic@linux.ibm.com>
To: Cornelia Huck <cohuck@redhat.com>
Cc: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>,
	Halil Pasic <pasic@linux.vnet.ibm.com>,
	linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org,
	kvm@vger.kernel.org, borntraeger@de.ibm.com,
	bjsdjshi@linux.ibm.com, pmorel@linux.ibm.com
Subject: Re: [PATCH v2 5/5] vfio: ccw: add traceponits for interesting error paths
Date: Mon, 30 Apr 2018 18:51:54 +0200	[thread overview]
Message-ID: <42c331bf-8ba1-7a67-5ec8-6bebcfad4ed7@linux.ibm.com> (raw)
In-Reply-To: <20180430170358.0ee6fe6a.cohuck@redhat.com>



On 04/30/2018 05:03 PM, Cornelia Huck wrote:
>> I think the naming of this fctl thing is a bit cryptic,
>> but if we don't see this as ABI I'm fine with it -- can be improved.
>> What would be a better name? I was thinking along the lines accept_request.
>> (Bad error code would mean that the request did not get accepted. Good
>> code does not mean the requested function was performed successfully.)
> I think fctl is fine (if you don't understand what 'fctl' is, you're
> unlikely to understand it even if it were named differently.)
> 

AFAIU this fctl is a bit more complicated than the normal fctl. But
better let sleeping dogs lie.

>> Also I think vfio_ccw_io_fctl with no zero error code would make sense
>> as dev_warn. If I were an admin looking into a problem I would very much
>> appreciate seeing something in the messages log (and not having to enable
>> tracing first). This point seems to be a good one for high level 'request gone
>> bad' kind of report. Opinions?
> I'd also exclude -EOPNOTSUPP (as this also might happen with e.g. a halt/clear enabled user space, which probes availability of halt/clear support by giving it a try once (yes, I really want to post my patches this week.))
> 

I'm looking forward to the clear/halt. It hope it will help me understand
the big vfio-ccw picture better. There are still dark spots, but I don't
feel like doing something against this, as there is quite some activity
going on here -- and I don't want to hamper the efforts by binding resources.

Regards,
Halil

  reply	other threads:[~2018-04-30 16:52 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-23 11:01 [PATCH v2 0/5] vfio: ccw: error handling fixes and improvements Dong Jia Shi
2018-04-23 11:01 ` [PATCH v2 1/5] vfio: ccw: fix cleanup if cp_prefetch fails Dong Jia Shi
2018-04-23 11:38   ` Halil Pasic
2018-04-23 11:40   ` Cornelia Huck
2018-04-23 12:00     ` Halil Pasic
2018-04-24  9:31   ` Cornelia Huck
     [not found]     ` <20180425024341.GY12194@bjsdjshi@linux.vnet.ibm.com>
2018-04-25 11:19       ` Halil Pasic
2018-04-23 11:01 ` [PATCH v2 2/5] vfio: ccw: shorten kernel doc description for pfn_array_pin() Dong Jia Shi
2018-04-23 11:44   ` Cornelia Huck
2018-04-23 11:01 ` [PATCH v2 3/5] vfio: ccw: refactor and improve pfn_array_alloc_pin() Dong Jia Shi
2018-04-23 11:01 ` [PATCH v2 4/5] vfio: ccw: set ccw->cda to NULL defensively Dong Jia Shi
2018-04-23 11:01 ` [PATCH v2 5/5] vfio: ccw: add traceponits for interesting error paths Dong Jia Shi
2018-04-27 10:13   ` Cornelia Huck
     [not found]     ` <20180428055023.GS5428@bjsdjshi@linux.vnet.ibm.com>
2018-04-30 11:51       ` Cornelia Huck
2018-04-30 14:14         ` Halil Pasic
2018-04-30 15:03           ` Cornelia Huck
2018-04-30 16:51             ` Halil Pasic [this message]
     [not found]             ` <20180502022330.GT5428@bjsdjshi@linux.vnet.ibm.com>
     [not found]               ` <20180516065355.GB6363@bjsdjshi@linux.ibm.com>
2018-05-22 12:55                 ` Cornelia Huck
2018-04-23 11:32 ` [PATCH v2 0/5] vfio: ccw: error handling fixes and improvements Cornelia Huck

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