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Andy Lutomirski 2f27bfffb4 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>
2019-05-21 18:48:56 +02:00
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80211
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ABI
Documentation: Add MDS vulnerability documentation
2019-05-14 19:19:41 +02:00
accounting
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acpi
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aoe
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arm
ARM: 8833/1: Ensure that NEON code always compiles with Clang
2019-04-05 22:29:11 +02:00
arm64
arm64: Add work around for Arm Cortex-A55 Erratum 1024718
2018-05-16 10:08:42 +02:00
auxdisplay
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backlight
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blackfin
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block
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blockdev
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bus-devices
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cdrom
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cgroup-v1
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cma
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connector
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console
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cpu-freq
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cpuidle
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cris
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crypto
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dev-tools
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development-process
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device-mapper
dm thin: fix documentation relative to low water mark threshold
2018-05-30 07:50:20 +02:00
devicetree
dt-bindings: eeprom: at24: add "atmel,24c2048" compatible string
2019-02-20 10:18:24 +01:00
dmaengine
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DocBook
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driver-api
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driver-model
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early-userspace
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EDID
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extcon
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fault-injection
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fb
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features
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filesystems
mm, proc: be more verbose about unstable VMA flags in /proc/<pid>/smaps
2019-01-26 09:38:36 +01:00
firmware_class
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fmc
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fpga
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frv
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gpio
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gpu
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hid
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hw-vuln
Documentation: Correct the possible MDS sysfs values
2019-05-14 19:19:42 +02:00
hwmon
hwmon: (ina2xx) fix sysfs shunt resistor read access
2018-10-03 17:01:52 -07:00
i2c
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ia64
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ide
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iio
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infiniband
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input
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ioctl
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isdn
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ja_JP
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kbuild
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kdump
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ko_KR
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laptops
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leds
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livepatch
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locking
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m68k
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media
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memory-devices
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metag
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mic
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mips
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misc-devices
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mmc
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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
2019-05-02 09:32:06 +02:00
nfc
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nios2
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nvdimm
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nvmem
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parisc
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PCI
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pcmcia
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perf
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phy
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platform
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power
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powerpc
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pps
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prctl
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pti
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ptp
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rapidio
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RCU
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s390
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scheduler
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scsi
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security
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serial
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sh
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sound
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sphinx
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sphinx-static
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spi
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sysctl
namei: allow restricted O_CREAT of FIFOs and regular files
2018-12-01 09:44:25 +01:00
target
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thermal
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timers
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tpm
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trace
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usb
USB: core: Fix bug caused by duplicate interface PM usage counter
2019-05-08 07:19:08 +02:00
virtual
KVM: Reject device ioctls from processes other than the VM's creator
2019-04-03 06:24:19 +02:00
vm
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w1
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watchdog
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wimax
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x86
x86/speculation/mds: Improve CPU buffer clear documentation
2019-05-21 18:48:56 +02:00
xtensa
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zh_CN
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.gitignore
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00-INDEX
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adding-syscalls.txt
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applying-patches.txt
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assoc_array.txt
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atomic_ops.txt
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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
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cgroup-v2.txt
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Changes
kbuild: verify that $DEPMOD is installed
2018-08-17 20:59:29 +02:00
circular-buffers.txt
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clk.txt
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CodeOfConflict
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CodingStyle
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conf.py
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cpu-hotplug.txt
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cpu-load.txt
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cputopology.txt
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crc32.txt
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dcdbas.txt
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debugging-modules.txt
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debugging-via-ohci1394.txt
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dell_rbu.txt
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devices.txt
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digsig.txt
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DMA-API-HOWTO.txt
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DMA-API.txt
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DMA-attributes.txt
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dma-buf-sharing.txt
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DMA-ISA-LPC.txt
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docutils.conf
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dontdiff
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dynamic-debug-howto.txt
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edac.txt
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efi-stub.txt
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eisa.txt
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email-clients.txt
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flexible-arrays.txt
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futex-requeue-pi.txt
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gcc-plugins.txt
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highuid.txt
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HOWTO
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hw_random.txt
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hwspinlock.txt
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index.rst
Documentation: Move L1TF to separate directory
2019-05-14 19:19:41 +02:00
init.txt
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initrd.txt
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intel_txt.txt
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Intel-IOMMU.txt
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io_ordering.txt
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io-mapping.txt
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iostats.txt
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IPMI.txt
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IRQ-affinity.txt
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IRQ-domain.txt
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IRQ.txt
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irqflags-tracing.txt
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isa.txt
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isapnp.txt
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java.txt
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kernel-doc-nano-HOWTO.txt
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kernel-docs.txt
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kernel-documentation.rst
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kernel-parameters.txt
x86/speculation/mds: Add 'mitigations=' support for MDS
2019-05-14 19:19:42 +02:00
kernel-per-CPU-kthreads.txt
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kobject.txt
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kprobes.txt
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kref.txt
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kselftest.txt
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ldm.txt
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local_ops.txt
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lockup-watchdogs.txt
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logo.gif
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logo.txt
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lzo.txt
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magic-number.txt
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mailbox.txt
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Makefile
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Makefile.sphinx
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ManagementStyle
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md-cluster.txt
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md.txt
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memory-barriers.txt
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memory-hotplug.txt
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men-chameleon-bus.txt
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module-signing.txt
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mono.txt
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nommu-mmap.txt
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ntb.txt
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numastat.txt
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oops-tracing.txt
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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
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pi-futex.txt
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pinctrl.txt
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pnp.txt
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preempt-locking.txt
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printk-formats.txt
lib/vsprintf: Remove atomic-unsafe support for %pCr
2018-07-03 11:23:06 +02:00
pwm.txt
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ramoops.txt
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rbtree.txt
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remoteproc.txt
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rfkill.txt
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robust-futex-ABI.txt
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robust-futexes.txt
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rpmsg.txt
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rtc.txt
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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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spec_ctrl.txt
x86/speculation: Add prctl() control for indirect branch speculation
2019-05-14 19:19:39 +02:00
speculation.txt
Documentation: Document array_index_nospec
2018-02-13 12:35:59 +01:00
stable_api_nonsense.txt
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stable_kernel_rules.txt
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static-keys.txt
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SubmitChecklist
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SubmittingDrivers
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SubmittingPatches
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svga.txt
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sync_file.txt
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sysfs-rules.txt
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sysrq.txt
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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
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VGA-softcursor.txt
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video-output.txt
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vme_api.txt
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volatile-considered-harmful.txt
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workqueue.txt
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xillybus.txt
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xz.txt
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zorro.txt
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