linux-kernel - Re: [PATCH] pseries/le: Fix another endiannes issue in RTAS call from xmon

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Message-ID: <54B85016.4080906@linux.vnet.ibm.com>
Date:	Thu, 15 Jan 2015 15:41:10 -0800
From:	Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>
To:	Michael Ellerman <mpe@...erman.id.au>
CC:	linuxppc-dev@...ts.ozlabs.org,
	Laurent Dufour <ldufour@...ux.vnet.ibm.com>, paulus@...ba.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pseries/le: Fix another endiannes issue in RTAS call
 from xmon

On 01/15/2015 02:19 PM, Michael Ellerman wrote:
> On Thu, 2015-01-15 at 11:44 -0800, Tyrel Datwyler wrote:
>> On 01/15/2015 09:23 AM, Laurent Dufour wrote:
>>> The commit 3b8a3c010969 ("powerpc/pseries: Fix endiannes issue in RTAS
>>> call from xmon") was fixing an endianness issue in the call made from
>>> xmon to RTAS.
>>>
>>> However, as Michael Ellerman noticed, this fix was not complete, the
>>> token value was not byte swapped. This lead to call an unexpected and
>>> most of the time unexisting RTAS function, which is silently ignored
>>> by RTAS.
>>
>> Nit. Not so much that is silently ignored by RTAS as much as
>> disable_surveillance silently doesn't check the return status of the
>> RTAS call. Maybe a check is warranted and reporting of non-success.
> 
> Yeah you're right, I added a printf of the result and got -3, which is also
> wrong as far as I can tell, but I didn't have the energy to chase it any
> further.

If this was on a powerkvm guest set-indicator should be present for
hotplug (DLPAR) support. However, the surveillance indicator would not
be implemented. I know sometimes I forget if I'm on a powervm or
powerkvm guest. Just a thought.

-Tyrel

> 
> Because this is in xmon we want to be extra careful about what we do, but an
> xmon_printf() should be safe. I'll do that as a cleanup after this.
> 
> cheers
> 
> 

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