linux.git/arch/x86/kernel/process_32.c, branch v5.1

Merge branch 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2018-12-27T01:37:51+00:00

Pull x86 fpu updates from Ingo Molnar:
 "Misc preparatory changes for an upcoming FPU optimization that will
  delay the loading of FPU registers to return-to-userspace"

* 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/fpu: Don't export __kernel_fpu_{begin,end}()
  x86/fpu: Update comment for __raw_xsave_addr()
  x86/fpu: Add might_fault() to user_insn()
  x86/pkeys: Make init_pkru_value static
  x86/thread_info: Remove _TIF_ALLWORK_MASK
  x86/process/32: Remove asm/math_emu.h include
  x86/fpu: Use unsigned long long shift in xfeature_uncompacted_offset()

Merge branch 'x86-cache-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2018-12-26T20:17:43+00:00

Pull x86 cache control updates from Borislav Petkov:

 - The generalization of the RDT code to accommodate the addition of
   AMD's very similar implementation of the cache monitoring feature.

   This entails a subsystem move into a separate and generic
   arch/x86/kernel/cpu/resctrl/ directory along with adding
   vendor-specific initialization and feature detection helpers.

   Ontop of that is the unification of user-visible strings, both in the
   resctrl filesystem error handling and Kconfig.

   Provided by Babu Moger and Sherry Hurwitz.

 - Code simplifications and error handling improvements by Reinette
   Chatre.

* 'x86-cache-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/resctrl: Fix rdt_find_domain() return value and checks
  x86/resctrl: Remove unnecessary check for cbm_validate()
  x86/resctrl: Use rdt_last_cmd_puts() where possible
  MAINTAINERS: Update resctrl filename patterns
  Documentation: Rename and update intel_rdt_ui.txt to resctrl_ui.txt
  x86/resctrl: Introduce AMD QOS feature
  x86/resctrl: Fixup the user-visible strings
  x86/resctrl: Add AMD's X86_FEATURE_MBA to the scattered CPUID features
  x86/resctrl: Rename the config option INTEL_RDT to RESCTRL
  x86/resctrl: Add vendor check for the MBA software controller
  x86/resctrl: Bring cbm_validate() into the resource structure
  x86/resctrl: Initialize the vendor-specific resource functions
  x86/resctrl: Move all the macros to resctrl/internal.h
  x86/resctrl: Re-arrange the RDT init code
  x86/resctrl: Rename the RDT functions and definitions
  x86/resctrl: Rename and move rdt files to a separate directory

x86/process/32: Remove asm/math_emu.h include

2018-12-03T17:51:16+00:00

The math_emu.h header files contains the definition of struct
math_emu_info which is not used in this file.

Remove the asm/math_emu.h include.

Signed-off-by: Sebastian Andrzej Siewior 
Signed-off-by: Borislav Petkov 
Reviewed-by: Andy Lutomirski 
Reviewed-by: Rik van Riel 
Cc: "H. Peter Anvin" 
Cc: "Jason A. Donenfeld" 
Cc: Dave Hansen 
Cc: Ingo Molnar 
Cc: Jann Horn 
Cc: Joerg Roedel 
Cc: Paolo Bonzini 
Cc: Radim Krčmář 
Cc: Rik van Riel 
Cc: Thomas Gleixner 
Cc: kvm ML 
Cc: x86-ml 
Link: https://lkml.kernel.org/r/20181128222035.2996-3-bigeasy@linutronix.de

x86/process: Consolidate and simplify switch_to_xtra() code

2018-11-28T10:57:11+00:00

Move the conditional invocation of __switch_to_xtra() into an inline
function so the logic can be shared between 32 and 64 bit.

Remove the handthrough of the TSS pointer and retrieve the pointer directly
in the bitmap handling function. Use this_cpu_ptr() instead of the
per_cpu() indirection.

This is a preparatory change so integration of conditional indirect branch
speculation optimization happens only in one place.

Signed-off-by: Thomas Gleixner 
Reviewed-by: Ingo Molnar 
Cc: Peter Zijlstra 
Cc: Andy Lutomirski 
Cc: Linus Torvalds 
Cc: Jiri Kosina 
Cc: Tom Lendacky 
Cc: Josh Poimboeuf 
Cc: Andrea Arcangeli 
Cc: David Woodhouse 
Cc: Tim Chen 
Cc: Andi Kleen 
Cc: Dave Hansen 
Cc: Casey Schaufler 
Cc: Asit Mallick 
Cc: Arjan van de Ven 
Cc: Jon Masters 
Cc: Waiman Long 
Cc: Greg KH 
Cc: Dave Stewart 
Cc: Kees Cook 
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20181125185005.280855518@linutronix.de

x86/resctrl: Rename the RDT functions and definitions

2018-11-22T19:16:18+00:00

As AMD is starting to support RESCTRL features, rename the RDT functions
and definitions to more generic names.

Replace "intel_rdt" with "resctrl" where applicable.

Signed-off-by: Babu Moger 
Signed-off-by: Borislav Petkov 
Reviewed-by: Borislav Petkov 
Cc: Andrew Morton 
Cc: Andy Lutomirski 
Cc: Arnd Bergmann 
Cc: Brijesh Singh 
Cc: "Chang S. Bae" 
Cc: David Miller 
Cc: David Woodhouse 
Cc: Dmitry Safonov 
Cc: Fenghua Yu 
Cc: Greg Kroah-Hartman 
Cc: "H. Peter Anvin" 
Cc: Ingo Molnar 
Cc: Jann Horn 
Cc: Joerg Roedel 
Cc: Jonathan Corbet 
Cc: Josh Poimboeuf 
Cc: Kate Stewart 
Cc: "Kirill A. Shutemov" 
Cc: 
Cc: Mauro Carvalho Chehab 
Cc: Paolo Bonzini 
Cc: Peter Zijlstra 
Cc: Philippe Ombredanne 
Cc: Pu Wen 
Cc: 
Cc: "Rafael J. Wysocki" 
Cc: Reinette Chatre 
Cc: Rian Hunter 
Cc: Sherry Hurwitz 
Cc: Suravee Suthikulpanit 
Cc: Thomas Gleixner 
Cc: Thomas Lendacky 
Cc: Tony Luck 
Cc: Vitaly Kuznetsov 
Cc: 
Link: https://lkml.kernel.org/r/20181121202811.4492-3-babu.moger@amd.com

x86/resctrl: Rename and move rdt files to a separate directory

2018-11-22T19:16:18+00:00

New generation of AMD processors add support for RDT (or QOS) features.
Together, these features will be called RESCTRL. With more than one
vendors supporting these features, it seems more appropriate to rename
these files.

Create a new directory with the name 'resctrl' and move all the
intel_rdt files to the new directory. This way all the resctrl related
code resides inside one directory.

 [ bp: Add SPDX identifier to the Makefile ]

Suggested-by: Borislav Petkov 
Signed-off-by: Babu Moger 
Signed-off-by: Borislav Petkov 
Cc: Andrew Morton 
Cc: Andy Lutomirski 
Cc: Arnd Bergmann 
Cc: Brijesh Singh 
Cc: "Chang S. Bae" 
Cc: David Miller 
Cc: David Woodhouse 
Cc: Dmitry Safonov 
Cc: Fenghua Yu 
Cc: Greg Kroah-Hartman 
Cc: "H. Peter Anvin" 
Cc: Ingo Molnar 
Cc: Jann Horn 
Cc: Joerg Roedel 
Cc: Jonathan Corbet 
Cc: Josh Poimboeuf 
Cc: Kate Stewart 
Cc: "Kirill A. Shutemov" 
Cc: 
Cc: Mauro Carvalho Chehab 
Cc: Paolo Bonzini 
Cc: Peter Zijlstra 
Cc: Philippe Ombredanne 
Cc: Pu Wen 
Cc: 
Cc: "Rafael J. Wysocki" 
Cc: Reinette Chatre 
Cc: Rian Hunter 
Cc: Sherry Hurwitz 
Cc: Suravee Suthikulpanit 
Cc: Thomas Gleixner 
Cc: Thomas Lendacky 
Cc: Tony Luck 
Cc: Vitaly Kuznetsov 
Cc: 
Link: https://lkml.kernel.org/r/20181121202811.4492-2-babu.moger@amd.com

x86/process: Don't mix user/kernel regs in 64bit __show_regs()

2018-09-06T12:33:12+00:00

When the kernel.print-fatal-signals sysctl has been enabled, a simple
userspace crash will cause the kernel to write a crash dump that contains,
among other things, the kernel gsbase into dmesg.

As suggested by Andy, limit output to pt_regs, FS_BASE and KERNEL_GS_BASE
in this case.

This also moves the bitness-specific logic from show_regs() into
process_{32,64}.c.

Fixes: 45807a1df9f5 ("vdso: print fatal signals")
Signed-off-by: Jann Horn 
Signed-off-by: Thomas Gleixner 
Cc: "H. Peter Anvin" 
Cc: Andy Lutomirski 
Cc: Borislav Petkov 
Cc: Greg Kroah-Hartman 
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20180831194151.123586-1-jannh@google.com

x86/entry: Rename update_sp0 to update_task_stack

2018-07-19T23:11:40+00:00

The function does not update sp0 anymore but updates makes the task-stack
visible for entry code. This is by either writing it to sp1 or by doing a
hypercall. Rename the function to get rid of the misleading name.

Signed-off-by: Joerg Roedel 
Signed-off-by: Thomas Gleixner 
Tested-by: Pavel Machek 
Cc: "H . Peter Anvin" 
Cc: linux-mm@kvack.org
Cc: Linus Torvalds 
Cc: Andy Lutomirski 
Cc: Dave Hansen 
Cc: Josh Poimboeuf 
Cc: Juergen Gross 
Cc: Peter Zijlstra 
Cc: Borislav Petkov 
Cc: Jiri Kosina 
Cc: Boris Ostrovsky 
Cc: Brian Gerst 
Cc: David Laight 
Cc: Denys Vlasenko 
Cc: Eduardo Valentin 
Cc: Greg KH 
Cc: Will Deacon 
Cc: aliguori@amazon.com
Cc: daniel.gruss@iaik.tugraz.at
Cc: hughd@google.com
Cc: keescook@google.com
Cc: Andrea Arcangeli 
Cc: Waiman Long 
Cc: "David H . Gutteridge" 
Cc: joro@8bytes.org
Link: https://lkml.kernel.org/r/1531906876-13451-15-git-send-email-joro@8bytes.org

x86/entry/32: Enter the kernel via trampoline stack

2018-07-19T23:11:37+00:00

Use the entry-stack as a trampoline to enter the kernel. The entry-stack is
already in the cpu_entry_area and will be mapped to userspace when PTI is
enabled.

Signed-off-by: Joerg Roedel 
Signed-off-by: Thomas Gleixner 
Tested-by: Pavel Machek 
Cc: "H . Peter Anvin" 
Cc: linux-mm@kvack.org
Cc: Linus Torvalds 
Cc: Andy Lutomirski 
Cc: Dave Hansen 
Cc: Josh Poimboeuf 
Cc: Juergen Gross 
Cc: Peter Zijlstra 
Cc: Borislav Petkov 
Cc: Jiri Kosina 
Cc: Boris Ostrovsky 
Cc: Brian Gerst 
Cc: David Laight 
Cc: Denys Vlasenko 
Cc: Eduardo Valentin 
Cc: Greg KH 
Cc: Will Deacon 
Cc: aliguori@amazon.com
Cc: daniel.gruss@iaik.tugraz.at
Cc: hughd@google.com
Cc: keescook@google.com
Cc: Andrea Arcangeli 
Cc: Waiman Long 
Cc: "David H . Gutteridge" 
Cc: joro@8bytes.org
Link: https://lkml.kernel.org/r/1531906876-13451-8-git-send-email-joro@8bytes.org

x86/entry/32: Load task stack from x86_tss.sp1 in SYSENTER handler

2018-07-19T23:11:36+00:00

x86_tss.sp0 will be used to point to the entry stack later to use it as a
trampoline stack for other kernel entry points besides SYSENTER.

So store the real task stack pointer in x86_tss.sp1, which is otherwise
unused by the hardware, as Linux doesn't make use of Ring 1.

Signed-off-by: Joerg Roedel 
Signed-off-by: Thomas Gleixner 
Tested-by: Pavel Machek 
Cc: "H . Peter Anvin" 
Cc: linux-mm@kvack.org
Cc: Linus Torvalds 
Cc: Andy Lutomirski 
Cc: Dave Hansen 
Cc: Josh Poimboeuf 
Cc: Juergen Gross 
Cc: Peter Zijlstra 
Cc: Borislav Petkov 
Cc: Jiri Kosina 
Cc: Boris Ostrovsky 
Cc: Brian Gerst 
Cc: David Laight 
Cc: Denys Vlasenko 
Cc: Eduardo Valentin 
Cc: Greg KH 
Cc: Will Deacon 
Cc: aliguori@amazon.com
Cc: daniel.gruss@iaik.tugraz.at
Cc: hughd@google.com
Cc: keescook@google.com
Cc: Andrea Arcangeli 
Cc: Waiman Long 
Cc: "David H . Gutteridge" 
Cc: joro@8bytes.org
Link: https://lkml.kernel.org/r/1531906876-13451-4-git-send-email-joro@8bytes.org