linux-toradex.git/include/linux/cpu.h, branch v6.0-rc7

x86/bugs: Report AMD retbleed vulnerability

2022-06-27T08:33:59+00:00

Report that AMD x86 CPUs are vulnerable to the RETBleed (Arbitrary
Speculative Code Execution with Return Instructions) attack.

  [peterz: add hygon]
  [kim: invert parity; fam15h]

Co-developed-by: Kim Phillips 
Signed-off-by: Kim Phillips 
Signed-off-by: Alexandre Chartre 
Signed-off-by: Peter Zijlstra (Intel) 
Signed-off-by: Borislav Petkov 
Reviewed-by: Josh Poimboeuf 
Signed-off-by: Borislav Petkov

x86/speculation/mmio: Add sysfs reporting for Processor MMIO Stale Data

2022-05-21T10:16:04+00:00

Add the sysfs reporting file for Processor MMIO Stale Data
vulnerability. It exposes the vulnerability and mitigation state similar
to the existing files for the other hardware vulnerabilities.

Signed-off-by: Pawan Gupta 
Signed-off-by: Borislav Petkov

x86,objtool: Mark cpu_startup_entry() __noreturn

2022-04-19T19:58:48+00:00

GCC-8 isn't clever enough to figure out that cpu_start_entry() is a
noreturn while objtool is. This results in code after the call in
start_secondary(). Give GCC a hand so that they all agree on things.

  vmlinux.o: warning: objtool: start_secondary()+0x10e: unreachable

Reported-by: Rick Edgecombe 
Signed-off-by: Peter Zijlstra (Intel) 
Acked-by: Josh Poimboeuf 
Link: https://lore.kernel.org/r/20220408094718.383658532@infradead.org

cpu/hotplug: Remove deprecated CPU-hotplug functions.

2021-09-10T22:41:21+00:00

No users in tree use the deprecated CPU-hotplug functions anymore.

Remove them.

Signed-off-by: Sebastian Andrzej Siewior 
Signed-off-by: Thomas Gleixner 
Link: https://lore.kernel.org/r/20210803141621.780504-39-bigeasy@linutronix.de

cpu/hotplug: Fix build error of using {add,remove}_cpu() with !CONFIG_SMP

2021-03-10T08:16:09+00:00

279dcf693ac7 ("virt: acrn: Introduce an interface for Service VM to
control vCPU") introduced {add,remove}_cpu() usage and it hit below
error with !CONFIG_SMP:

../drivers/virt/acrn/hsm.c: In function ‘remove_cpu_store’:
../drivers/virt/acrn/hsm.c:389:3: error: implicit declaration of function ‘remove_cpu’; [-Werror=implicit-function-declaration]
   remove_cpu(cpu);

../drivers/virt/acrn/hsm.c:402:2: error: implicit declaration of function ‘add_cpu’; [-Werror=implicit-function-declaration]
   add_cpu(cpu);

Add add_cpu() function prototypes with !CONFIG_SMP and remove_cpu() with
!CONFIG_HOTPLUG_CPU for such usage.

Fixes: 279dcf693ac7 ("virt: acrn: Introduce an interface for Service VM to control vCPU")
Cc: Stephen Rothwell 
Cc: Thomas Gleixner 
Cc: Greg Kroah-Hartman 
Cc: Qais Yousef 
Reported-by: Randy Dunlap 
Reviewed-by: Qais Yousef 
Acked-by: Randy Dunlap  # build-tested
Signed-off-by: Shuo Liu 
Link: https://lore.kernel.org/r/20210221134339.57851-1-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman

cpu/hotplug: Add lockdep_is_cpus_held()

2021-01-07T00:24:59+00:00

This commit adds a lockdep_is_cpus_held() function to verify that the
proper locks are held and that various operations are running in the
correct context.

Signed-off-by: Frederic Weisbecker 
Cc: Paul E. McKenney 
Cc: Josh Triplett 
Cc: Steven Rostedt 
Cc: Mathieu Desnoyers 
Cc: Lai Jiangshan 
Cc: Joel Fernandes 
Cc: Neeraj Upadhyay 
Cc: Thomas Gleixner 
Cc: Boqun Feng 
Signed-off-by: Paul E. McKenney

treewide: Convert macro and uses of section(foo) to section("foo")

2020-10-25T21:51:49+00:00

Use a more generic form for __section that requires quotes to avoid
complications with clang and gcc differences.

Remove the quote operator # from compiler_attributes.h __section macro.

Convert all unquoted __section(foo) uses to quoted __section("foo").
Also convert __attribute__((section("foo"))) uses to __section("foo")
even if the __attribute__ has multiple list entry forms.

Conversion done using the script at:

    https://lore.kernel.org/lkml/75393e5ddc272dc7403de74d645e6c6e0f4e70eb.camel@perches.com/2-convert_section.pl

Signed-off-by: Joe Perches 
Reviewed-by: Nick Desaulniers 
Reviewed-by: Miguel Ojeda 
Signed-off-by: Linus Torvalds

cpu/speculation: Add prototype for cpu_show_srbds()

2020-06-17T15:28:08+00:00

0-day is not happy that there is no prototype for cpu_show_srbds():

  drivers/base/cpu.c:565:16: error: no previous prototype for 'cpu_show_srbds'

Fixes: 7e5b3c267d25 ("x86/speculation: Add Special Register Buffer Data Sampling (SRBDS) mitigation")
Reported-by: kernel test robot 
Signed-off-by: Guenter Roeck 
Signed-off-by: Borislav Petkov 
Link: https://lkml.kernel.org/r/20200617141410.93338-1-linux@roeck-us.net

cpu/hotplug: Remove __freeze_secondary_cpus()

2020-05-07T13:18:41+00:00

The refactored function is no longer required as the codepaths that call
freeze_secondary_cpus() are all suspend/resume related now.

Signed-off-by: Qais Yousef 
Signed-off-by: Thomas Gleixner 
Cc: "Rafael J. Wysocki" 
Link: https://lkml.kernel.org/r/20200430114004.17477-2-qais.yousef@arm.com

cpu/hotplug: Remove disable_nonboot_cpus()

2020-05-07T13:18:40+00:00

The single user could have called freeze_secondary_cpus() directly.

Since this function was a source of confusion, remove it as it's
just a pointless wrapper.

While at it, rename enable_nonboot_cpus() to thaw_secondary_cpus() to
preserve the naming symmetry.

Done automatically via:

	git grep -l enable_nonboot_cpus | xargs sed -i 's/enable_nonboot_cpus/thaw_secondary_cpus/g'

Signed-off-by: Qais Yousef 
Signed-off-by: Thomas Gleixner 
Cc: "Rafael J. Wysocki" 
Link: https://lkml.kernel.org/r/20200430114004.17477-1-qais.yousef@arm.com