linux-kernel - Re: [PATCH HACK] powerpc: quick hack to get a functional eHEA with hardirq preemption

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:	Thu, 25 Sep 2008 09:42:31 +0200
From:	Sebastien Dugue <sebastien.dugue@...l.net>
To:	benh@...nel.crashing.org
Cc:	Milton Miller <miltonm@....com>,
	Jan-Bernd Themann <ossthema@...ibm.com>,
	Christoph Raisch <RAISCH@...ibm.com>,
	Paul Mackerras <paulus@...ba.org>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH HACK] powerpc: quick hack to get a functional eHEA with
 hardirq preemption

On Thu, 25 Sep 2008 17:22:41 +1000 Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:

> On Thu, 2008-09-25 at 09:18 +0200, Sebastien Dugue wrote:
> > 
> > > Ok, that's the right approach then. It should work. I don't know
> > what
> > > the specific problems with HEA are at this stage.
> > 
> >   Yep, except as it behaves in way that the current -rt fasteoi flow
> > cannot handle.
> 
> We probably need to make a special xics flow handler for -rt that does
> what Milton suggested, ie, bring down the CPU priority right away

  Do you mean creating a custom fasteoi handler into xics.c? Also, it's
not clear to me from looking at the code how you go about changing the
cpu priority.

> and
> only EOI later or something like that, instead of masking/unmasking.
> 
> I don't know what are the other potential issues with the HEA though.

  Don't know either, but that I can test.

  Thanks,

  Sebastien.
--
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/