linux-kernel - [PATCH RFC 0/8] powerpc barrier

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Date:   Tue, 13 Mar 2018 19:32:58 +0100
From:   Michal Suchanek <msuchanek@...e.de>
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Peter Zijlstra <peterz@...radead.org>,
        Michal Suchanek <msuchanek@...e.de>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Nicholas Piggin <npiggin@...il.com>,
        "Tobin C. Harding" <me@...in.cc>,
        Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
        David Gibson <david@...son.dropbear.id.au>,
        Al Viro <viro@...iv.linux.org.uk>,
        Michael Neuling <mikey@...ling.org>,
        "Oliver O'Halloran" <oohall@...il.com>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Balbir Singh <bsingharora@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Christophe Leroy <christophe.leroy@....fr>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        Daniel Axtens <dja@...ens.net>,
        Russell Currey <ruscur@...sell.cc>,
        Joe Perches <joe@...ches.com>,
        "Bryant G. Ly" <bryantly@...ux.vnet.ibm.com>,
        Cédric Le Goater <clg@...d.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH RFC 0/8] powerpc barrier_nospec

Hello,

this is patchset adding barrier_nospec on powerpc. It is based on the
out-of-tree gmb() patch and the existing rfi patches.

I do not have the tests for the Spectre/Meltdown issues available so this is
untested.

Feedback on the general approach as well as actual effectivity is welcome.

Thanks

Michal


Michal Suchanek (8):
  powerpc: Add barrier_nospec
  powerpc: Use barrier_nospec in copy_from_user
  powerpc/64: Use barrier_nospec in syscall entry
  powerpc/64s: Add support for ori barrier_nospec
  powerpc/64: Patch barrier_nospec in modules
  powerpc/64: barrier_nospec: Add debugfs trigger
  powerpc/64s: barrier_nospec: Add hcall triggerr
  powerpc/64: barrier_nospec: Add commandline trigger

 arch/powerpc/include/asm/barrier.h        |  9 ++++
 arch/powerpc/include/asm/feature-fixups.h |  9 ++++
 arch/powerpc/include/asm/setup.h          | 11 +++++
 arch/powerpc/include/asm/uaccess.h        | 11 ++++-
 arch/powerpc/kernel/entry_64.S            |  3 ++
 arch/powerpc/kernel/module.c              |  6 +++
 arch/powerpc/kernel/setup_64.c            | 72 +++++++++++++++++++++++++++++++
 arch/powerpc/kernel/vmlinux.lds.S         |  7 +++
 arch/powerpc/lib/feature-fixups.c         | 38 ++++++++++++++++
 arch/powerpc/platforms/pseries/setup.c    | 38 ++++++++++------
 10 files changed, 190 insertions(+), 14 deletions(-)

-- 
2.13.6