From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: ioperm problem
Date: Thu, 17 Nov 2011 10:05:57 -0800
Message-ID: <4EC54D05.3050308@goop.org>
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To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: =?UTF-8?B?amE=?= <pavel@netsafe.cz>, =?UTF-8?B?UGF2ZWwgTWF0xJs=?=, xen-devel@lists.xensource.com, tom.goetz@virtualcomputer.com, Ben Guthro <ben.guthro@virtualcomputer.com>
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On 11/17/2011 09:30 AM, Konrad Rzeszutek Wilk wrote:
> On Thu, Nov 17, 2011 at 08:56:34AM -0500, Ben Guthro wrote:
>> Attached is our patch to work around issues with the ioports with
>> some older nVidia cards.
>>
>> This, admittedly is a bit of a hack, and not exactly something that
>> I would see upstream wanting to carry, for a variety of reasons. It
>> really should all be predicated on whether the kernel is the initial
>> domain, etc.
>>
>> This opens up the legacy VGA ports in the VGA arbiter code.
> Was there a userspace program that did this? As in it would
> call ioperm?
>
>> Konrad - I think that you had suggested an alternate way of doing
>> this, IIRC, but I can't seem to find it in my inbox. Due to
>> competing demands, and my nVidia hardware disappearing, I never went
>> back to rework this code.
> Ah, I might have some code that I just uncovered from Jeremy's old
> git tree.
>
> I've put it up on devel/ioperm - it nicely wraps the ioperm
> call to go the native or paravirt.

Yeah, I'd sort of let that sit, since there's nothing in a "modern"
system which should require it.  Allowing usermode to poke at ioports
from within a domain is inherently suspect, after all.

    J