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e9ea1e7f53
linux_dsm_epyc7002/arch
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Kyle Huey e9ea1e7f53 x86/arch_prctl: Add ARCH_[GET|SET]_CPUID 
Intel supports faulting on the CPUID instruction beginning with Ivy Bridge.
When enabled, the processor will fault on attempts to execute the CPUID
instruction with CPL>0. Exposing this feature to userspace will allow a
ptracer to trap and emulate the CPUID instruction.

When supported, this feature is controlled by toggling bit 0 of
MSR_MISC_FEATURES_ENABLES. It is documented in detail in Section 2.3.2 of
https://bugzilla.kernel.org/attachment.cgi?id=243991

Implement a new pair of arch_prctls, available on both x86-32 and x86-64.

ARCH_GET_CPUID: Returns the current CPUID state, either 0 if CPUID faulting
    is enabled (and thus the CPUID instruction is not available) or 1 if
    CPUID faulting is not enabled.

ARCH_SET_CPUID: Set the CPUID state to the second argument. If
    cpuid_enabled is 0 CPUID faulting will be activated, otherwise it will
    be deactivated. Returns ENODEV if CPUID faulting is not supported on
    this system.

The state of the CPUID faulting flag is propagated across forks, but reset
upon exec.

Signed-off-by: Kyle Huey <khuey@kylehuey.com>
Cc: Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com>
Cc: kvm@vger.kernel.org
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: linux-kselftest@vger.kernel.org
Cc: Nadav Amit <nadav.amit@gmail.com>
Cc: Robert O'Callahan <robert@ocallahan.org>
Cc: Richard Weinberger <richard@nod.at>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Len Brown <len.brown@intel.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: user-mode-linux-devel@lists.sourceforge.net
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: user-mode-linux-user@lists.sourceforge.net
Cc: David Matlack <dmatlack@google.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
Cc: linux-fsdevel@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>
Link: http://lkml.kernel.org/r/20170320081628.18952-9-khuey@kylehuey.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2017-03-20 16:10:34 +01:00
..
alpha sched/headers: Move task->mm handling methods to <linux/sched/mm.h> 2017-03-03 01:43:28 +01:00
arc arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
arm arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
arm64 arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
avr32 arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
blackfin sched/headers: Move task->mm handling methods to <linux/sched/mm.h> 2017-03-03 01:43:28 +01:00
c6x sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
cris Merge branch 'prep-for-5level' 2017-03-10 08:59:07 -08:00
frv arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
h8300 arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
hexagon arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
ia64 arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
m32r sched/headers: Move task->mm handling methods to <linux/sched/mm.h> 2017-03-03 01:43:28 +01:00
m68k sched/headers: Prepare to remove the <linux/mm_types.h> dependency from <linux/sched.h> 2017-03-02 08:42:37 +01:00
metag arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
microblaze arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
mips arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
mn10300 arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
nios2 arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
openrisc arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
parisc Merge branch 'parisc-4.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux 2017-03-03 16:20:06 -08:00
powerpc Merge branch 'prep-for-5level' 2017-03-10 08:59:07 -08:00
s390 arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
score arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
sh Merge branch 'prep-for-5level' 2017-03-10 08:59:07 -08:00
sparc arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
tile arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
um x86/arch_prctl/64: Rename do_arch_prctl() to do_arch_prctl_64() 2017-03-20 16:10:32 +01:00
unicore32 arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
x86 x86/arch_prctl: Add ARCH_[GET|SET]_CPUID 2017-03-20 16:10:34 +01:00
xtensa arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
.gitignore
Kconfig scripts/spelling.txt: add "an user" pattern and fix typo instances 2017-02-27 18:43:46 -08:00