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From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
	Andy Lutomirski <luto@kernel.org>, Ingo Molnar <mingo@kernel.org>,
	Borislav Petkov <bp@alien8.de>, Brian Gerst <brgerst@gmail.com>,
	Denys Vlasenko <dvlasenk@redhat.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Rik van Riel <riel@redhat.com>,
	daniel.gruss@iaik.tugraz.at, hughd@google.com,
	keescook@google.com, linux-mm@kvack.org,
	michael.schwarz@iaik.tugraz.at, moritz.lipp@iaik.tugraz.at,
	richard.fellner@student.tugraz.at
Subject: [patch V2 0/5] x86/kaiser: Boot time disabling and debug support
Date: Mon, 27 Nov 2017 00:14:03 +0100	[thread overview]
Message-ID: <20171126231403.657575796@linutronix.de> (raw)

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(-)

WARNING: multiple messages have this Message-ID
From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
	Andy Lutomirski <luto@kernel.org>, Ingo Molnar <mingo@kernel.org>,
	Borislav Petkov <bp@alien8.de>, Brian Gerst <brgerst@gmail.com>,
	Denys Vlasenko <dvlasenk@redhat.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Rik van Riel <riel@redhat.com>,
	daniel.gruss@iaik.tugraz.at, hughd@google.com,
	keescook@google.com, linux-mm@kvack.org,
	michael.schwarz@iaik.tugraz.at, moritz.lipp@iaik.tugraz.at,
	richard.fellner@student.tugraz.at
Subject: [patch V2 0/5] x86/kaiser: Boot time disabling and debug support
Date: Mon, 27 Nov 2017 00:14:03 +0100	[thread overview]
Message-ID: <20171126231403.657575796@linutronix.de> (raw)

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(-)



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             reply	other threads:[~2017-11-26 23:25 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-26 23:14 Thomas Gleixner [this message]
2017-11-26 23:14 ` [patch V2 0/5] x86/kaiser: Boot time disabling and debug support Thomas Gleixner
2017-11-26 23:14 ` [patch V2 1/5] x86/kaiser: Respect disabled CPU features Thomas Gleixner
2017-11-26 23:14   ` Thomas Gleixner
2017-11-27  9:57   ` Peter Zijlstra
2017-11-27  9:57     ` Peter Zijlstra
2017-11-27 11:47     ` Thomas Gleixner
2017-11-27 11:47       ` Thomas Gleixner
2017-11-27 12:31       ` Brian Gerst
2017-11-27 12:31         ` Brian Gerst
2017-11-27 13:18         ` Thomas Gleixner
2017-11-27 13:18           ` Thomas Gleixner
2017-11-27 18:11   ` Dave Hansen
2017-11-27 18:11     ` Dave Hansen
2017-11-27 18:37     ` Kees Cook
2017-11-27 18:37       ` Kees Cook
2017-11-26 23:14 ` [patch V2 2/5] x86/kaiser: Simplify disabling of global pages Thomas Gleixner
2017-11-26 23:14   ` Thomas Gleixner
2017-11-27 11:49   ` Thomas Gleixner
2017-11-27 11:49     ` Thomas Gleixner
2017-11-27 18:15   ` Dave Hansen
2017-11-27 18:15     ` Dave Hansen
2017-11-27 20:28     ` Thomas Gleixner
2017-11-27 20:28       ` Thomas Gleixner
2017-11-26 23:14 ` [patch V2 3/5] x86/dump_pagetables: Check KAISER shadow page table for WX pages Thomas Gleixner
2017-11-26 23:14   ` Thomas Gleixner
2017-11-27 18:17   ` Dave Hansen
2017-11-27 18:17     ` Dave Hansen
2017-11-26 23:14 ` [patch V2 4/5] x86/mm/debug_pagetables: Allow dumping current pagetables Thomas Gleixner
2017-11-26 23:14   ` Thomas Gleixner
2017-11-27  9:41   ` Peter Zijlstra
2017-11-27  9:41     ` Peter Zijlstra
2017-11-27 10:06     ` [PATCH] vfs: Add PERM_* symbolic helpers for common file mode/permissions Ingo Molnar
2017-11-27 10:06       ` Ingo Molnar
2017-11-27 19:21       ` Linus Torvalds
2017-11-27 19:21         ` Linus Torvalds
2017-11-28 10:54         ` Ingo Molnar
2017-11-28 10:54           ` Ingo Molnar
2017-11-28 11:12         ` Ingo Molnar
2017-11-28 11:12           ` Ingo Molnar
2017-11-29  8:52           ` Michael Ellerman
2017-11-29  8:52             ` Michael Ellerman
2017-11-27 18:18   ` [patch V2 4/5] x86/mm/debug_pagetables: Allow dumping current pagetables Dave Hansen
2017-11-27 18:18     ` Dave Hansen
2017-11-26 23:14 ` [patch V2 5/5] x86/kaiser: Add boottime disable switch Thomas Gleixner
2017-11-26 23:14   ` Thomas Gleixner
2017-11-27  9:48   ` Peter Zijlstra
2017-11-27  9:48     ` Peter Zijlstra
2017-11-27 10:22     ` Peter Zijlstra
2017-11-27 10:22       ` Peter Zijlstra
2017-11-27 11:50       ` Thomas Gleixner
2017-11-27 11:50         ` Thomas Gleixner
2017-11-27 12:49         ` Peter Zijlstra
2017-11-27 12:49           ` Peter Zijlstra
2017-11-27 21:43       ` Peter Zijlstra
2017-11-27 21:43         ` Peter Zijlstra
2017-11-27 18:22   ` Dave Hansen
2017-11-27 18:22     ` Dave Hansen
2017-11-27 19:00     ` Thomas Gleixner
2017-11-27 19:00       ` Thomas Gleixner
2017-11-27 19:18       ` Josh Poimboeuf
2017-11-27 19:18         ` Josh Poimboeuf
2017-11-27 20:47         ` Thomas Gleixner
2017-11-27 20:47           ` Thomas Gleixner

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