Andy Lutomirski ce814dc7e8 x86/speculation/mds: Improve CPU buffer clear documentation ...

commit 9d8d0294e7 upstream.

On x86_64, all returns to usermode go through
prepare_exit_to_usermode(), with the sole exception of do_nmi().
This even includes machine checks -- this was added several years
ago to support MCE recovery.  Update the documentation.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Frederic Weisbecker <frederic@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jon Masters <jcm@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Fixes: 04dcbdb805 ("x86/speculation/mds: Clear CPU buffers on exit to user")
Link: http://lkml.kernel.org/r/999fa9e126ba6a48e9d214d2f18dbde5c62ac55c.1557865329.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2019-06-11 12:23:34 +02:00

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ABI

x86/speculation/mds: Add sysfs reporting for MDS

2019-05-16 19:45:14 +02:00

accounting

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acpi

mfd: core: redo ACPI matching of the children devices

2015-10-26 15:25:53 +01:00

aoe

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arm

ARM: 8833/1: Ensure that NEON code always compiles with Clang

2019-04-27 09:33:51 +02:00

arm64

arm64: documentation: document tagged pointer stack constraints

2017-05-25 14:30:15 +02:00

auxdisplay

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backlight

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blackfin

Docs: blackfin: Use new switch macro SAMPLE_IRQ_TIMER instead of IRQ_TIMER5

2015-05-07 09:35:14 -06:00

block

null_blk: register as a LightNVM device

2015-11-16 15:22:28 -07:00

blockdev

zram: update documentation

2015-09-24 15:39:42 -06:00

bus-devices

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cdrom

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cgroups

Merge tag 'docs-for-linus' of git://git.lwn.net/linux

2015-11-05 15:59:24 -08:00

cma

cma: debug: document new debugfs interface

2015-04-14 16:49:00 -07:00

connector

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console

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cpu-freq

cpufreq: remove redundant CPUFREQ_INCOMPATIBLE notifier event

2015-09-01 15:50:38 +02:00

cpuidle

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cris

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crypto

KEYS: Merge the type-specific data with the payload data

2015-10-21 15:18:36 +01:00

development-process

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device-mapper

dm thin: fix documentation relative to low water mark threshold

2018-05-30 07:48:53 +02:00

devicetree

ARM: dts: at91: add new compatibility string for macb on sama5d3

2018-10-20 09:52:33 +02:00

dmaengine

Documentation: dmaengine: Add DMA_CTRL_REUSE documentation

2015-08-17 13:46:22 +05:30

DocBook

Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux

2015-11-10 09:33:06 -08:00

driver-model

driver-core: platform: Provide helpers for multi-driver modules

2015-10-05 05:02:40 +01:00

dvb

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early-userspace

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EDID

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extcon

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fault-injection

futex: Fault/error injection capabilities

2015-07-20 11:45:45 +02:00

fb

Documentation/fb: add documentation for sm712fb

2015-08-07 15:05:01 -07:00

features

Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

2015-11-04 14:47:13 -08:00

filesystems

mm, proc: be more verbose about unstable VMA flags in /proc/<pid>/smaps

2019-01-26 09:42:55 +01:00

firmware_class

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fmc

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fpga

usage documentation for FPGA manager core

2015-10-07 18:07:20 +01:00

frv

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gpio

Merge tag 'docs-for-linus' of git://git.lwn.net/linux

2015-11-05 15:59:24 -08:00

hid

HID: sensor: Update document for custom sensor

2015-04-10 22:22:56 +02:00

hw-vuln

Documentation: Correct the possible MDS sysfs values

2019-05-16 19:45:16 +02:00

hwmon

hwmon: (ina2xx) fix sysfs shunt resistor read access

2018-10-10 08:52:09 +02:00

i2c

i2c: i801: add Intel Lewisburg device IDs

2015-11-20 16:22:21 +01:00

ia64

virtual: Documentation: simplify and generalize paravirt_ops.txt

2015-02-13 17:15:44 +10:30

ide

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infiniband

IB/hfi1: add driver files

2015-08-28 22:59:36 -04:00

input

Input: add userio module

2015-10-27 18:55:31 -07:00

ioctl

Merge tag 'char-misc-4.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

2015-11-04 22:15:15 -08:00

isdn

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ja_JP

Doc: ja_JP: Fix typo in HOWTO

2015-06-08 16:43:09 -06:00

kbuild

kbuild: document recursive dependency limitation / resolution

2015-10-08 15:36:16 +02:00

kdump

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ko_KR

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laptops

Move freefall program from Documentation/ to tools/

2015-06-08 16:42:07 -06:00

leds

Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds

2015-07-01 19:09:11 -07:00

locking

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

2015-11-03 16:10:43 -08:00

m68k

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memory-devices

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metag

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mic

samples: move mic/mpssd example code from Documentation

2017-03-12 06:37:23 +01:00

mips

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misc-devices

Doc:misc-devices: Fix typo in Documentation/misc-devices

2015-09-18 10:04:24 -06:00

mmc

mmc: core: Remove MMC_CLKGATE

2015-10-26 16:00:09 +01:00

mn10300

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mtd

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namespaces

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netlabel

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networking

ipv4: set the tcp_min_rtt_wlen range from 0 to one day

2019-05-16 19:44:52 +02:00

nfc

NFC: Fix typo in nfc-hci.txt

2015-06-08 23:15:45 +02:00

nios2

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nvdimm

libnvdimm: documentation clarifications

2015-11-12 09:55:23 -08:00

nvmem

Documentation: nvmem: add nvmem api level and how-to doc

2015-08-05 13:43:45 -07:00

parisc

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PCI

Merge tag 'docs-for-linus' of git://git.lwn.net/linux-2.6

2015-04-18 11:10:49 -04:00

pcmcia

pcmcia: Fix typo in locking documentation

2015-08-07 14:34:58 +02:00

phy

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platform

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power

PCI / PM: Update runtime PM documentation for PCI devices

2015-09-25 02:48:44 +02:00

powerpc

Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

2015-09-02 12:22:54 -07:00

pps

Doc: pps: Fix file name in pps.txt

2015-07-14 12:35:42 -06:00

prctl

Documentation/prctl: don't build tsc tests when cross compiling

2015-06-22 16:05:04 -06:00

pti

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ptp

testptp: Silence compiler warnings on ppc64

2015-09-29 21:16:56 -07:00

rapidio

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RCU

Merge branches 'doc.2015.10.06a', 'percpu-rwsem.2015.10.06a' and 'torture.2015.10.06a' into HEAD

2015-10-07 16:06:25 -07:00

s390

KVM: s390: remove outdated documentation

2015-07-29 11:02:35 +02:00

scheduler

sched/dl/Documentation: Split Section 3

2015-05-19 08:39:21 +02:00

scsi

scsi: fix race between simultaneous decrements of ->host_failed

2016-07-27 09:47:39 -07:00

security

KEYS: Merge the type-specific data with the payload data

2015-10-21 15:18:36 +01:00

serial

Fix OpenSSH pty regression on close

2016-06-01 12:15:52 -07:00

sh

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sound

ALSA: hda - Remove obsoleted documentation

2015-10-17 18:34:24 +02:00

spi

ARM: pxa: Remove unused clock_enable field from struct pxa2xx_spi_master

2015-09-20 19:37:20 +02:00

sysctl

namei: allow restricted O_CREAT of FIFOs and regular files

2018-12-01 09:46:41 +01:00

target

target: use per-attribute show and store methods

2015-10-13 22:17:49 -07:00

thermal

thermal: power_allocator: relax the requirement of two passive trip points

2015-09-14 07:41:45 -07:00

timers

documentation: Update NO_HZ_FULL interaction with POSIX timers

2015-02-26 11:57:29 -08:00

tpm

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trace

Merge tag 'trace-v4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2015-11-06 13:30:20 -08:00

usb

USB: core: Fix bug caused by duplicate interface PM usage counter

2019-05-16 19:45:00 +02:00

vDSO

Documentation/vDSO: don't build tests when cross compiling

2015-06-22 16:04:57 -06:00

video4linux

[media] media: videobuf2: Change queue_setup argument

2015-10-20 14:48:39 -02:00

virtual

KVM: Reject device ioctls from processes other than the VM's creator

2019-04-03 06:23:28 +02:00

vm

mm: make compound_head() robust

2015-11-06 17:50:42 -08:00

w1

w1: masters: omap_hdq: add support for 1-wire mode

2015-10-05 04:47:09 +01:00

watchdog

Documentation/watchdog: add timeout and ping rate control to watchdog-test.c

2015-09-09 21:33:36 +02:00

wimax

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x86

x86/speculation/mds: Improve CPU buffer clear documentation

2019-06-11 12:23:34 +02:00

xtensa

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zh_CN

sysfs.txt: fix pre-kernfs sysfs_dirent reference

2015-09-13 14:38:50 -06:00

00-INDEX

Update of Documentation/dmaengine/00-INDEX

2014-12-29 15:28:24 -07:00

adding-syscalls.txt

Documentation: describe how to add a system call

2015-08-13 17:54:06 -06:00

applying-patches.txt

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assoc_array.txt

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atomic_ops.txt

locking/atomics, cmpxchg: Privatize the inclusion of asm/cmpxchg.h

2015-09-13 10:35:46 +02:00

bad_memory.txt

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basic_profiling.txt

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bcache.txt

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binfmt_misc.txt

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braille-console.txt

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bt8xxgpio.txt

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btmrvl.txt

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BUG-HUNTING

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bus-virt-phys-mapping.txt

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cachetlb.txt

rmap: drop support of non-linear mappings

2015-02-10 14:30:31 -08:00

Changes

kbuild: verify that $DEPMOD is installed

2018-08-17 20:56:45 +02:00

circular-buffers.txt

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clk.txt

clk: change clk_ops' ->determine_rate() prototype

2015-07-27 18:12:01 -07:00

coccinelle.txt

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CodeOfConflict

Code of Conflict

2015-02-27 11:44:24 -08:00

CodingStyle

Documentation: CodingStyle: remove broken links in the References section

2015-07-10 13:54:34 -06:00

cpu-hotplug.txt

cpumask: fix cpu-hotplug documentation

2015-03-05 13:37:01 +10:30

cpu-load.txt

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cputopology.txt

Documentation: Update cputopology.txt

2015-05-27 15:22:15 +02:00

crc32.txt

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dcdbas.txt

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debugging-modules.txt

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debugging-via-ohci1394.txt

Doc: Change wikipedia's URL from http to https

2015-06-22 10:14:05 -06:00

dell_rbu.txt

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devices.txt

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digsig.txt

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DMA-API-HOWTO.txt

Documentation: DMA API: Be more explicit that nents is always the same

2015-09-24 15:50:06 -06:00

DMA-API.txt

dma: remove external references to dma_supported

2015-11-09 15:11:24 -08:00

DMA-attributes.txt

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dma-buf-sharing.txt

dma-buf: cleanup dma_buf_export() to make it easily extensible

2015-04-21 14:47:16 +05:30

DMA-ISA-LPC.txt

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dontdiff

Documentation: dontdiff: remove media from dontdiff

2015-11-11 10:08:07 -07:00

dynamic-debug-howto.txt

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edac.txt

Documentation/EDAC: Add reference documents section for amd64_edac

2015-09-29 13:42:41 +02:00

efi-stub.txt

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eisa.txt

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email-clients.txt

Merge tag '4.4-additional' of git://git.lwn.net/linux

2015-11-13 09:19:05 -08:00

flexible-arrays.txt

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futex-requeue-pi.txt

doc: Fix misnamed FUTEX_CMP_REQUEUE_PI op constants

2015-01-19 12:05:32 +01:00

gcov.txt

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gdb-kernel-debugging.txt

scripts/gdb: add basic documentation

2015-02-17 14:34:54 -08:00

highuid.txt

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HOWTO

docs: update HOWTO for 3.x -> 4.x versioning

2015-08-24 11:28:17 -06:00

hsi.txt

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hw_random.txt

hwrng: doc - Fix device node name reference /dev/hw_random => /dev/hwrng

2015-09-21 22:00:41 +08:00

hwspinlock.txt

hwspinlock/core: add device tree support

2015-05-02 09:54:30 +03:00

init.txt

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initrd.txt

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intel_txt.txt

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Intel-IOMMU.txt

x86/vt-d: Fix documentation of DRHD

2015-08-25 10:44:49 +02:00

io_ordering.txt

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io-mapping.txt

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iostats.txt

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IPMI.txt

ipmi watchdog : add panic_wdt_timeout parameter

2015-11-16 06:28:43 -06:00

IRQ-affinity.txt

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IRQ-domain.txt

irqdomain: Documentation updates

2015-10-13 19:01:25 +02:00

IRQ.txt

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irqflags-tracing.txt

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isapnp.txt

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java.txt

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kasan.txt

mm, slub, kasan: enable user tracking by default with KASAN=y

2015-11-05 19:34:48 -08:00

kernel-doc-nano-HOWTO.txt

Documenation: Update location of docproc.c

2015-07-14 12:36:39 -06:00

kernel-docs.txt

kernel-docs.txt: update kernelnewbies reference

2015-10-11 15:36:43 -06:00

kernel-parameters.txt

x86/speculation/mds: Add 'mitigations=' support for MDS

2019-05-16 19:45:16 +02:00

kernel-per-CPU-kthreads.txt

documentation: Update per-CPU kthreads documentation

2015-02-26 11:57:30 -08:00

kmemcheck.txt

Documentation: update the CONFIG_DEBUG_PAGEALLOC description

2015-03-20 07:41:55 -06:00

kmemleak.txt

Doc: Change wikipedia's URL from http to https

2015-06-22 10:14:05 -06:00

kobject.txt

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kprobes.txt

kprobes: Update Documentation/kprobes.txt

2015-03-20 07:41:55 -06:00

kref.txt

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kselftest.txt

Documentation: Update kselftest.txt

2015-09-24 15:51:53 -06:00

ldm.txt

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local_ops.txt

percpu: update local_ops.txt to reflect this_cpu operations

2014-12-13 12:42:53 -08:00

lockup-watchdogs.txt

kernel/watchdog.c: add sysctl knob hardlockup_panic

2015-11-05 19:34:48 -08:00

logo.gif

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logo.txt

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lzo.txt

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magic-number.txt

Documentation/magic-number: Remove SCC_MAGIC

2015-05-13 15:39:04 -04:00

mailbox.txt

Documentation: minor typo fix in mailbox.txt

2015-08-13 18:03:18 -06:00

Makefile

selftests: Move networking/timestamping from Documentation

2018-12-17 21:55:17 +01:00

ManagementStyle

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md-cluster.txt

md-cluster: fix deadlock issue on message lock

2015-08-31 19:41:41 +02:00

md.txt

doc:md: fix typo in md.txt.

2015-06-23 06:49:44 -06:00

media-framework.txt

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memory-barriers.txt

atomic: remove all traces of READ_ONCE_CTRL() and atomic*_read_ctrl()

2015-11-03 17:22:17 -08:00

memory-hotplug.txt

mem-hotplug: fix typo in Documentation/memory-hotplug.txt

2015-03-20 07:41:55 -06:00

men-chameleon-bus.txt

Documentation: Minor changes to men-chameleon-bus.txt

2015-07-24 15:15:17 +02:00

module-signing.txt

Documentation/module-signing.txt: Note need for version info if reusing a key

2016-08-20 18:09:27 +02:00

mono.txt

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nommu-mmap.txt

fs: introduce f_op->mmap_capabilities for nommu mmap support

2015-01-20 14:02:58 -07:00

ntb.txt

NTB: Rename Intel code names to platform names

2015-07-04 14:09:25 -04:00

numastat.txt

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oops-tracing.txt

livepatch: kernel: add TAINT_LIVEPATCH

2014-12-22 15:40:48 +01:00

padata.txt

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parport-lowlevel.txt

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parport.txt

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percpu-rw-semaphore.txt

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phy.txt

phy: core: Add devm_of_phy_get_by_index to phy-core

2015-05-11 21:42:23 +05:30

pi-futex.txt

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pinctrl.txt

pinctrl: Flag strict is a field in struct pinmux_ops

2016-10-07 15:23:41 +02:00

pnp.txt

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preempt-locking.txt

x86/fpu: Rename math_state_restore() to fpu__restore()

2015-05-19 15:47:18 +02:00

printk-formats.txt

lib/vsprintf: Remove atomic-unsafe support for %pCr

2018-07-03 11:21:27 +02:00

pwm.txt

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ramoops.txt

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rbtree.txt

documentation: fix small typo in rbtree.txt

2015-09-13 14:38:50 -06:00

remoteproc.txt

remoteproc: introduce rproc_get_by_phandle API

2015-06-16 21:12:52 +03:00

rfkill.txt

rfkill: document rfkill module parameters

2015-01-09 23:22:12 +01:00

robust-futex-ABI.txt

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robust-futexes.txt

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rpmsg.txt

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rtc.txt

Documentation, split up rtc.txt into documentation and test file

2015-03-24 22:01:58 -06:00

SAK.txt

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SecurityBugs

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serial-console.txt

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sgi-ioc4.txt

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SM501.txt

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smsc_ece1099.txt

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sparse.txt

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spec_ctrl.txt

x86/speculation: Add prctl() control for indirect branch speculation

2019-05-16 19:45:12 +02:00

speculation.txt

Documentation: Document array_index_nospec

2018-02-25 11:03:53 +01:00

stable_api_nonsense.txt

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stable_kernel_rules.txt

stable: Update documentation to clarify preferred procedure

2015-05-22 09:38:56 -06:00

static-keys.txt

locking/static_keys: Fix up the static keys documentation

2015-09-15 07:12:06 +02:00

SubmitChecklist

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SubmittingDrivers

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SubmittingPatches

Merge tag '4.4-additional' of git://git.lwn.net/linux

2015-11-13 09:19:05 -08:00

svga.txt

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sysfs-rules.txt

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sysrq.txt

mm, oom: do not panic for oom kills triggered from sysrq

2015-09-08 15:35:28 -07:00

this_cpu_ops.txt

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unaligned-memory-access.txt

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unicode.txt

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unshare.txt

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vfio.txt

vfio: powerpc/spapr: Support Dynamic DMA windows

2015-06-11 15:16:55 +10:00

VGA-softcursor.txt

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vgaarbiter.txt

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video-output.txt

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vme_api.txt

Documentation: mention vme_master_mmap() in VME API

2015-06-12 17:26:56 -07:00

volatile-considered-harmful.txt

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workqueue.txt

workqueue: fix trivial typo in Documentation/workqueue.txt

2015-05-05 09:50:38 -04:00

xillybus.txt

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xz.txt

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zorro.txt

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