linux-kernel - Re: regression fixed by using pci=rom

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 9 May 2008 09:05:16 -0700
From:	Gary Hade <garyhade@...ibm.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dave Airlie <airlied@...il.com>,
	kernel list <linux-kernel@...r.kernel.org>,
	Gary Hade <garyhade@...ibm.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: regression fixed by using pci=rom

On Thu, May 08, 2008 at 11:29:39PM -0700, Jesse Barnes wrote:
> On Thursday, May 08, 2008 6:46 pm Linus Torvalds wrote:
> > On Thu, 8 May 2008, Jesse Barnes wrote:
> > > Hm, yeah in many cases we definitely *do* want to try to get the
> > > expansion ROM space allocated.  But maybe it should be a lower priority
> > > than other BARs... Gary?
> >
> > The thing is, a lot of these things have been done this way because not
> > doing them that way breaks.
> >
> > We want to allocate expansion ROM space - even if we don't enable it -
> > because not doing so will screw up bus sizing etc, and can make it
> > impossible to allocate later.
> >
> > In general, changing PCI allocation strategy is really _really_ dangerous,
> > even when it is "right", because it tends to expose a lot of issues where
> > something worked just because it was perhaps indirectly causing a layout
> > that worked.
> 
> Yeah, that was my first impression too, but the patch went upstream awhile ago 
> and I didn't see any background except for the changelog.
> 
> If anything, we should have a pci=norom option instead, so that big systems 
> that don't need the ROMs can use their address space more efficiently.

This is actually the solution I was going to suggest.  I will 
work on it.

Gary

-- 
Gary Hade
System x Enablement
IBM Linux Technology Center
503-578-4503  IBM T/L: 775-4503
garyhade@...ibm.com
http://www.ibm.com/linux/ltc
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/