Thomas Gleixner 22dd836508 x86/speculation/mds: Add mitigation mode VMWERV ... In virtualized environments it can happen that the host has the microcode update which utilizes the VERW instruction to clear CPU buffers, but the hypervisor is not yet updated to expose the X86_FEATURE_MD_CLEAR CPUID bit to guests. Introduce an internal mitigation mode VMWERV which enables the invocation of the CPU buffer clearing even if X86_FEATURE_MD_CLEAR is not set. If the system has no updated microcode this results in a pointless execution of the VERW instruction wasting a few CPU cycles. If the microcode is updated, but not exposed to a guest then the CPU buffers will be cleared. That said: Virtual Machines Will Eventually Receive Vaccine Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@suse.de> Reviewed-by: Jon Masters <jcm@redhat.com> Tested-by: Jon Masters <jcm@redhat.com>		2019-03-06 21:52:15 +01:00
..
ABI	x86/speculation/mds: Add sysfs reporting for MDS	2019-03-06 21:52:14 +01:00
accelerators
accounting
acpi
admin-guide	x86/speculation/mds: Add mitigation control for MDS	2019-03-06 21:52:14 +01:00
aoe
arm
arm64	arm64 festive updates for 4.21	2018-12-25 17:41:56 -08:00
auxdisplay
backlight
block	block: doc: add slice_idle_us to bfq documentation	2019-01-09 07:38:48 -07:00
blockdev	zram: idle writeback fixes and cleanup	2019-01-08 17:15:10 -08:00
bpf	bpf, doc: update design qa to reflect kern_version requirement	2019-01-07 15:52:00 -08:00
bus-devices
cdrom
cgroup-v1
cma
connector
console
core-api	XArray: Honour reserved entries in xa_insert	2019-01-06 22:12:58 -05:00
cpu-freq
cpuidle
crypto	crypto: skcipher - remove remnants of internal IV generators	2018-12-23 11:52:45 +08:00
dev-tools	A fairly normal cycle for documentation stuff. We have a new	2018-12-29 11:21:49 -08:00
device-mapper
devicetree	A single fix for building DT bindings in-tree.	2019-02-02 10:34:32 -08:00
doc-guide
driver-api	pci-v4.21-changes	2019-01-05 17:57:34 -08:00
driver-model	Documentation: driver core: remove use of BUS_ATTR	2019-01-08 15:17:45 +01:00
early-userspace
EDID
extcon
fault-injection
fb	fbdev: fbmem: convert CONFIG_FB_LOGO_CENTER into a cmd line option	2019-01-16 17:42:35 +01:00
features	Documentation/features: Add csky kernel features	2019-01-07 22:22:16 +08:00
filesystems	Documentation: driver core: remove use of BUS_ATTR	2019-01-08 15:17:45 +01:00
firmware_class
fmc
fpga
gpio
gpu	A fairly normal cycle for documentation stuff. We have a new	2018-12-29 11:21:49 -08:00
hid
hwmon
i2c
ia64
ide
iio
infiniband
input
ioctl
isdn
kbuild	kbuild: generate asm-generic wrappers if mandatory headers are missing	2019-01-06 09:46:51 +09:00
kdump
kernel-hacking
laptops
leds
lightnvm
livepatch
locking
m68k
maintainer
md
media	A fairly normal cycle for documentation stuff. We have a new	2018-12-29 11:21:49 -08:00
memory-devices
mic
mips
misc-devices
mmc
mtd
namespaces
netlabel
networking	net: dsa: Remove documentation for port_fdb_prepare	2019-02-23 18:38:00 -08:00
nfc
nios2
nvdimm	libnvdimm/security: Add documentation for nvdimm security support	2018-12-21 12:44:41 -08:00
nvmem
openrisc
parisc
PCI
pcmcia
perf
phy
platform
power
powerpc	powerpc/fadump: Reservationless firmware assisted dump	2018-12-21 11:32:49 +11:00
pps
process	Documentation: change linux-4.x references to 5.x	2019-02-17 15:41:05 -07:00
pti
ptp
rapidio
RCU
riscv
s390
scheduler
scsi	SCSI misc on 20181224	2018-12-28 14:48:06 -08:00
security	Merge branch 'next-integrity' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2019-01-02 09:43:14 -08:00
serial
sh
sound
sparc
sphinx
sphinx-static
spi
sysctl	Documentation: Fix grammatical error in sysctl/fs.txt & clarify negative dentry	2019-02-11 09:10:22 -08:00
target
thermal
timers
trace	Merge branches 'pm-cpuidle', 'pm-cpufreq' and 'pm-sleep'	2019-01-11 10:09:51 +01:00
translations	Documentation: change linux-4.x references to 5.x	2019-02-17 15:41:05 -07:00
usb
userspace-api	Merge branch 'next-seccomp' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2019-01-02 09:48:13 -08:00
virtual	Documentation/virtual/kvm: Update URL for AMD SEV API specification	2019-01-11 18:38:07 +01:00
vm	A fairly normal cycle for documentation stuff. We have a new	2018-12-29 11:21:49 -08:00
w1
watchdog	watchdog: docs: kernel-api: don't reference removed functions	2018-12-24 13:15:06 +01:00
wimax
x86	x86/speculation/mds: Add mitigation mode VMWERV	2019-03-06 21:52:15 +01:00
xilinx
xtensa
.gitignore
atomic_bitops.txt
atomic_t.txt
bt8xxgpio.txt
btmrvl.txt
bus-virt-phys-mapping.txt
Changes
clearing-warn-once.txt
CodingStyle
conf.py
cpu-load.txt
cputopology.txt
crc32.txt
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt
digsig.txt
DMA-API-HOWTO.txt
DMA-API.txt
DMA-attributes.txt
DMA-ISA-LPC.txt
docutils.conf
dontdiff
efi-stub.txt
eisa.txt
flexible-arrays.txt
futex-requeue-pi.txt
gcc-plugins.txt
highuid.txt
hw_random.txt
hwspinlock.txt
index.rst	x86/speculation/mds: Add mds_clear_cpu_buffers()	2019-03-06 21:52:12 +01:00
intel_txt.txt
Intel-IOMMU.txt
io_ordering.txt
io-mapping.txt
iostats.txt
IPMI.txt
IRQ-affinity.txt
IRQ-domain.txt
IRQ.txt
irqflags-tracing.txt
isa.txt
isapnp.txt
kernel-per-CPU-kthreads.txt
kobject.txt
kprobes.txt
kref.txt
ldm.txt
lockup-watchdogs.txt
logo.gif
logo.txt
lsm.txt
lzo.txt
mailbox.txt
Makefile
memory-barriers.txt
men-chameleon-bus.txt
nommu-mmap.txt
ntb.txt
numastat.txt
padata.txt
parport-lowlevel.txt
percpu-rw-semaphore.txt
phy.txt
pi-futex.txt
pnp.txt
preempt-locking.txt
pwm.txt
rbtree.txt
remoteproc.txt
rfkill.txt
robust-futex-ABI.txt
robust-futexes.txt
rpmsg.txt
rtc.txt
SAK.txt
sgi-ioc4.txt
siphash.txt
SM501.txt
smsc_ece1099.txt
speculation.txt
static-keys.txt
SubmittingPatches
svga.txt
switchtec.txt
sync_file.txt
tee.txt
this_cpu_ops.txt
unaligned-memory-access.txt
vfio-mediated-device.txt
vfio.txt
video-output.txt
xillybus.txt
xz.txt
zorro.txt