linux-kernel - [RFC PATCH 0/2] x86: Fix missing core serialization on migration

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Message-Id: <20171110211249.10742-1-mathieu.desnoyers@efficios.com>
Date:   Fri, 10 Nov 2017 16:12:47 -0500
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Andrew Hunter <ahh@...gle.com>,
        Maged Michael <maged.michael@...il.com>,
        Avi Kivity <avi@...lladb.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Dave Watson <davejwatson@...com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Andrea Parri <parri.andrea@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Greg Hackmann <ghackmann@...gle.com>,
        Will Deacon <will.deacon@....com>,
        David Sehr <sehr@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>, x86@...nel.org,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: [RFC PATCH 0/2] x86: Fix missing core serialization on migration

x86 can return to user-space through sysexit and sysretq, which are not
core serializing. This breaks expectations from user-space about
sequential consistency from a single-threaded self-modifying program
point of view in specific migration patterns.

Feedback is welcome,

Thanks,

Mathieu

Mathieu Desnoyers (2):
  x86: Introduce sync_core_before_usermode
  Fix: x86: Add missing core serializing instruction on migration

 arch/x86/Kconfig                 |  1 +
 arch/x86/include/asm/processor.h | 10 ++++++++++
 include/linux/processor.h        |  6 ++++++
 kernel/sched/core.c              |  7 +++++++
 kernel/sched/sched.h             |  1 +
 5 files changed, 25 insertions(+)

-- 
2.11.0