linux-kernel - [patch V2 0/5] x86/kaiser: Boot time disabling and debug support

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Message-Id: <20171126231403.657575796@linutronix.de>
Date:   Mon, 27 Nov 2017 00:14:03 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        Brian Gerst <brgerst@...il.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Rik van Riel <riel@...hat.com>, daniel.gruss@...k.tugraz.at,
        hughd@...gle.com, keescook@...gle.com, linux-mm@...ck.org,
        michael.schwarz@...k.tugraz.at, moritz.lipp@...k.tugraz.at,
        richard.fellner@...dent.tugraz.at
Subject: [patch V2 0/5] x86/kaiser: Boot time disabling and debug support

This patch series applies on top of

     git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/mm

It contains the following updates:

  - Don't set NX/PAGE_GLOBAL unconditionally

  - Get rid of the compile time PAGE_GLOBAL disabling

  - Add debug support for WX mappings in the KAISER shadow table

  - Provide debug files to dump the kernel and the user page table for the
    current task.

  - Add a boot time switch to disable KAISER. This does not yet take care of
    the 8k PGD allocations, but that can be done on top.

Changes vs. V1:

  - Prevent setting PAGE_GLOBAL/NX when not supported or disabled

  - Restructured the debug stuff a bit

  - Extended the boot time disable to debug stuff

I tried to reenable paravirt by disabling kaiser at boot time when XEN_PV
is detected. XEN_PV is the only one having CR3 access paravirtualized,
which will explode nicely in the enter/exit code.

But enabling KAISER has some weird not yet debugged side effects even on
KVM guests. Will look at that tomorrow morning.

Thanks,

	tglx

---
 arch/x86/entry/calling.h             |    7 +++
 arch/x86/include/asm/kaiser.h        |   10 ++++
 arch/x86/include/asm/pgtable.h       |    1 
 arch/x86/include/asm/pgtable_64.h    |    9 +++
 arch/x86/include/asm/pgtable_types.h |   16 ------
 arch/x86/mm/debug_pagetables.c       |   81 ++++++++++++++++++++++++++++++++---
 arch/x86/mm/dump_pagetables.c        |   32 +++++++++++--
 arch/x86/mm/init.c                   |   14 ++++--
 arch/x86/mm/kaiser.c                 |   42 +++++++++++++++++-
 arch/x86/mm/pageattr.c               |   16 +++---
 security/Kconfig                     |    2 
 11 files changed, 190 insertions(+), 40 deletions(-)