linux-kernel - [PATCH 0/3] CR4 fixes (some are urgent)

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Date:   Wed, 28 Sep 2016 12:34:13 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     x86@...nel.org
Cc:     david@...giorato.net, Borislav Petkov <bp@...en8.de>,
        Brian Gerst <brgerst@...il.com>, linux-kernel@...r.kernel.org,
        Andy Lutomirski <luto@...nel.org>
Subject: [PATCH 0/3] CR4 fixes (some are urgent)

Hi Ingo, etc:

Patches 1 and 2 fix boot regressions.  Patch 1 needs to be
backported.  Patch 2 doesn't because the regression is new in 4.8
(although it's probably unobservable because the regression fixed in
patch 1 also prevented bootup on affected CPUs).

Patch 3 cleans the whole mess up.  It's probably not 4.8 material,
but I'm sending it as part of this series for ease of review.  If
you like, you could apply patches 1 and 2 to x86/urgent, merge into
x86/asm, and apply patch 3 on top.

Andy Lutomirski (3):
  x86/init: Fix cr4_init_shadow() on CR4-less machines
  x86/boot: Fix another __read_cr4() case on 486
  x86/asm: Get rid of __read_cr4_safe()

 arch/x86/include/asm/paravirt.h       |  4 ----
 arch/x86/include/asm/paravirt_types.h |  1 -
 arch/x86/include/asm/special_insns.h  | 22 +++++++---------------
 arch/x86/kernel/paravirt.c            |  1 -
 arch/x86/kernel/process_32.c          |  2 +-
 arch/x86/kernel/setup.c               |  9 +++++++--
 arch/x86/power/cpu.c                  |  2 +-
 arch/x86/xen/enlighten.c              |  1 -
 8 files changed, 16 insertions(+), 26 deletions(-)

-- 
2.7.4