linux-kernel - [PATCH v4 00/10] x86: Support compiling out userspace IO (iopl and ioperm)

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Date:	Sun, 2 Nov 2014 09:31:22 -0800
From:	Josh Triplett <josh@...htriplett.org>
To:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Kees Cook <keescook@...omium.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, x86@...nel.org,
	xen-devel@...ts.xenproject.org
Subject: [PATCH v4 00/10] x86: Support compiling out userspace IO (iopl and
 ioperm)

This patch series makes it possible to compile out the userspace IO system
calls, iopl and ioperm.

The first patch does some 32/64 unification in copy_thread to make subsequent
changes easier.  The second patch simplifies the complex calculation of the TSS
segment limit, which also makes it easier to change in the last patch.  Patches
3-9 introduce helpers to make it easier to compile out IO.  The last patch adds
and uses the new CONFIG_X86_IOPORT to support compiling out userspace IO.

v3 had patches 3-10 as a single patch; v4 splits out the various helpers and
macros into separate patches, as requested by Thomas Gleixner.

I've verified that this compiles after each patch.

Josh Triplett (10):
  x86: process: Unify 32-bit and 64-bit copy_thread I/O bitmap handling
  x86: tss: Eliminate fragile calculation of TSS segment limit
  x86: processor.h: Introduce macros to initialize IO fields of thread
    and TSS
  x86: paravirt: Wrap initialization of set_iopl_mask in a macro
  x86: cpu: Add helper function unifying 32-bit and 64-bit IO init in
    cpu_init
  x86: process: Introduce helper to clear a thread's IO bitmap
  x86: process: Introduce helper to switch iopl mask
  x86: process: Introduce helper for IO-related bits of exit_thread
  x86: process: Introduce helper to switch IO bitmap
  x86: Support compiling out userspace IO (iopl and ioperm)

 arch/x86/Kconfig                      | 10 ++++
 arch/x86/include/asm/desc.h           | 11 +----
 arch/x86/include/asm/paravirt.h       |  2 +
 arch/x86/include/asm/paravirt_types.h |  5 ++
 arch/x86/include/asm/processor.h      | 55 +++++++++++++++++----
 arch/x86/include/asm/syscalls.h       |  3 ++
 arch/x86/kernel/Makefile              |  3 +-
 arch/x86/kernel/cpu/common.c          | 12 +----
 arch/x86/kernel/entry_64.S            |  9 ++--
 arch/x86/kernel/paravirt.c            |  2 +-
 arch/x86/kernel/process-io.h          | 93 +++++++++++++++++++++++++++++++++++
 arch/x86/kernel/process.c             | 34 ++-----------
 arch/x86/kernel/process_32.c          | 41 +++++----------
 arch/x86/kernel/process_64.c          | 27 +++-------
 arch/x86/kernel/ptrace.c              |  8 +++
 arch/x86/xen/enlighten.c              |  4 +-
 drivers/tty/vt/vt_ioctl.c             |  2 +-
 kernel/sys_ni.c                       |  5 ++
 18 files changed, 208 insertions(+), 118 deletions(-)
 create mode 100644 arch/x86/kernel/process-io.h

-- 
2.1.1

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