linux-kernel - [PATCH 0/2] sched: finish_switch

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-next>] [day] [month] [year] [list]

Message-Id: <1384330574-18418-1-git-send-email-schwidefsky@de.ibm.com>
Date:	Wed, 13 Nov 2013 09:16:12 +0100
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org
Cc:	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: [PATCH 0/2] sched: finish_switch_mm hook

Hi,

in order to implement TLB flushing on s390 in a way that is 100%
compliant with the architecture I would like to introcude a new
hook to the scheduler. In concept it pairs with the switch_mm
function and is called after all locks have been released to
complete the switch_mm operation. The use case for s390 boils
down to the ability to wait for another CPU in switch_mm/
finish_switch_mm.

Right now the issue is theoretical and can only show up under
a extreme race condition in combination with a buggy user space
program. But to implement local TLB flushing which has been
added to the latest machine (zEC12) the finish_switch_mm hook
will be needed.

Patch #2 of the series is included as reference and shows how the
finish_switch_mm hook would be used in s390 code. The description
of the patch has more details why the hook is needed.

-- 
1.7.9.5

--
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/