linux-kernel - Re: [PATCH] iSCSI/iBFT: use proper address translation

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Message-Id: <4AC5C68F0200007800017A3F@vpn.id2.novell.com>
Date:	Fri, 02 Oct 2009 08:23:27 +0100
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	"Jeremy Fitzhardinge" <Jeremy.Fitzhardinge@...rix.com>
Cc:	"ketuzsezr@...nok.org" <ketuzsezr@...nok.org>,
	"Martin Wilck" <Martin.Wilck@...itsu-siemens.com>,
	"pjones@...hat.com" <pjones@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iSCSI/iBFT: use proper address translation

>>> Jeremy Fitzhardinge <Jeremy.Fitzhardinge@...rix.com> 01.10.09 23:46 >>>
>On 10/01/09 01:01, Jan Beulich wrote:
>> In virtual environments (namely, Xen Dom0) virt <-> phys and
>> virt <-> isa-bus translations cannot be freely interchanged. When
>> looking at memory below 1M, the latter translations should always
>> be used.
>>   
>
>Do you have a different definition for isa_virt_to_bus in your kernel? 
>As far as I can see it is defined to be the same as virt_to_phys.  Also,
>the ISA memory is identity mapped into the domain's physical mapping
>space, so it should be directly accessible without any problems.

I wasn't sure if this is an issue in the pv-ops kernel, so I copied you just
in case. Yes, we do have a different virt<->isa_bus translation, but
the point of the patch really is that virt<->phys translations are
incorrectly being used here regardless of the underlying environment.

Jan

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