Tom Lendacky 9272c25734 x86/CPU/AMD: Clear RDRAND CPUID bit on AMD family 15h/16h ... [ Upstream commit c49a0a8013 ] There have been reports of RDRAND issues after resuming from suspend on some AMD family 15h and family 16h systems. This issue stems from a BIOS not performing the proper steps during resume to ensure RDRAND continues to function properly. RDRAND support is indicated by CPUID Fn00000001_ECX[30]. This bit can be reset by clearing MSR C001_1004[62]. Any software that checks for RDRAND support using CPUID, including the kernel, will believe that RDRAND is not supported. Update the CPU initialization to clear the RDRAND CPUID bit for any family 15h and 16h processor that supports RDRAND. If it is known that the family 15h or family 16h system does not have an RDRAND resume issue or that the system will not be placed in suspend, the "rdrand=force" kernel parameter can be used to stop the clearing of the RDRAND CPUID bit. Additionally, update the suspend and resume path to save and restore the MSR C001_1004 value to ensure that the RDRAND CPUID setting remains in place after resuming from suspend. Note, that clearing the RDRAND CPUID bit does not prevent a processor that normally supports the RDRAND instruction from executing it. So any code that determined the support based on family and model won't #UD. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Andrew Cooper <andrew.cooper3@citrix.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Chen Yu <yu.c.chen@intel.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Juergen Gross <jgross@suse.com> Cc: Kees Cook <keescook@chromium.org> Cc: "linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org> Cc: "linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org> Cc: Nathan Chancellor <natechancellor@gmail.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Pavel Machek <pavel@ucw.cz> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: <stable@vger.kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "x86@kernel.org" <x86@kernel.org> Link: https://lkml.kernel.org/r/7543af91666f491547bd86cebb1e17c66824ab9f.1566229943.git.thomas.lendacky@amd.com [sl: adjust context in docs] Signed-off-by: Sasha Levin <sashal@kernel.org>		2019-09-06 10:19:41 +02:00
..
80211	docs-rst: sphinxify 802.11 documentation	2016-10-11 16:19:17 -06:00
ABI	Documentation: Add MDS vulnerability documentation	2019-05-14 19:19:41 +02:00
accounting	tools: move accounting tool from Documentation	2016-09-23 13:07:15 -06:00
acpi	Merge branches 'acpi-button', 'acpi-battery' and 'acpi-doc'	2016-10-02 01:40:20 +02:00
aoe
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	samples: move auxdisplay example code from Documentation	2016-09-23 11:52:32 -06:00
backlight
blackfin	samples: move blackfin gptimers-example from Documentation	2016-10-10 07:12:02 -06:00
block	block: remove remnant refs to hardsect	2016-09-14 08:44:57 -06:00
blockdev
bus-devices
cdrom
cgroup-v1
cma
connector
console
cpu-freq	cpufreq-stats: Minor documentation fix	2016-09-08 23:05:07 +02:00
cpuidle
cris
crypto
dev-tools	mm: kmemleak: avoid using __va() on addresses that don't have a lowmem mapping	2016-10-11 15:06:33 -07:00
development-process	docs-rst: add inter-document cross references	2016-09-21 15:43:09 -06:00
device-mapper	dm thin: fix documentation relative to low water mark threshold	2018-05-30 07:50:20 +02:00
devicetree	arm64: dts: marvell: Fix A37xx UART0 register size	2019-08-04 09:33:44 +02:00
dmaengine
DocBook	A single commit converting the mac80211 DocBook template over to Sphinx.	2016-10-14 14:11:22 -07:00
driver-api	docs: Don't format internal MPT docs	2016-09-06 09:15:48 -06:00
driver-model	power supply and reset changes for the v4.9 series	2016-10-06 18:21:15 -07:00
early-userspace
EDID
extcon
fault-injection
fb
features	Documentation: MIPS supports HAVE_REGS_AND_STACK_ACCESS_API	2016-10-13 17:19:19 +02:00
filesystems	mm, proc: be more verbose about unstable VMA flags in /proc/<pid>/smaps	2019-01-26 09:38:36 +01:00
firmware_class
fmc
fpga
frv
gpio	gpio/board.txt: point to gpiod_set_value	2016-10-20 14:14:11 +02:00
gpu	Merge tag 'drm-for-v4.9' of git://people.freedesktop.org/~airlied/linux	2016-10-11 18:12:22 -07:00
hid
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	i2c: Documentation: i2c-topology: fix minor whitespace nit	2016-11-10 21:18:56 +01:00
ia64	selftests: move ia64 tests from Documentation/ia64	2016-09-20 09:58:12 -06:00
ide
iio	iio: Documentation: Correct the path used to create triggers.	2016-10-01 00:49:58 -06:00
infiniband	IB/hfi1: Document new sysfs entries for hfi1 driver	2016-10-02 08:42:19 -04:00
input	Input: ALPS - add V8 protocol documentation	2016-10-04 11:47:02 -07:00
ioctl	doc: ioctl: Add some clarifications to botching-up-ioctls	2016-09-06 06:00:22 -06:00
isdn
ja_JP
kbuild	Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild	2016-10-14 14:26:58 -07:00
kdump	Documentation: kdump: Add description of enable multi-cpus support	2016-09-20 18:02:54 -06:00
ko_KR
laptops	tools: move laptops dslm tool from Documentation	2016-09-23 13:07:21 -06:00
leds	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds	2016-10-04 10:25:53 -07:00
livepatch
locking	locking/lglock: Remove lglock implementation	2016-09-22 15:25:56 +02:00
m68k
media	videodev2.h: go back to limited range Y'CbCr for SRGB and, ADOBERGB	2017-02-23 17:44:37 +01:00
memory-devices
metag
mic	samples: move mic/mpssd example code from Documentation	2016-09-20 12:38:48 -06:00
mips
misc-devices	samples: move misc-devices/mei example code from Documentation	2016-09-23 11:51:43 -06:00
mmc
mn10300
mtd
namespaces
netlabel
networking	tcp: add tcp_min_snd_mss sysctl	2019-06-17 19:53:33 +02:00
nfc
nios2
nvdimm
nvmem
parisc
PCI	PCI changes for the v4.9 merge window:	2016-10-07 11:46:37 -07:00
pcmcia	tools: move pcmcia crc32hash tool from Documentation	2016-09-23 13:07:27 -06:00
perf	perf: xgene: Add APM X-Gene SoC Performance Monitoring Unit driver	2016-09-15 11:20:55 -07:00
phy
platform
power	power supply and reset changes for the v4.9 series	2016-10-06 18:21:15 -07:00
powerpc	powerpc updates for 4.9	2016-10-07 20:19:31 -07:00
pps
prctl	selftests: move prctl tests from Documentation/prctl	2016-09-20 09:09:09 -06:00
pti
ptp	selftests: move ptp tests from Documentation/ptp	2016-09-20 09:54:38 -06:00
rapidio
RCU	kthread: kthread worker API cleanup	2016-10-11 15:06:33 -07:00
s390
scheduler	sched/deadline: Document behavior of sched_yield()	2016-09-10 11:17:41 +02:00
scsi	scsi: g_NCR5380: Stop using scsi_module.c	2016-09-29 21:52:43 -04:00
security
serial
sh
sound
sphinx	docs: sphinx-extensions: make rstFlatTable work with docutils 0.13	2017-01-09 08:32:18 +01:00
sphinx-static	This is the documentation update pull for the 4.9 merge window.	2016-10-04 13:54:07 -07:00
spi	Doc: update 00-INDEX files to reflect the runnable code move	2016-10-10 07:12:09 -06:00
sysctl	bpf: add bpf_jit_limit knob to restrict unpriv allocations	2019-08-25 10:51:41 +02:00
target
thermal	thermal: Add support for hardware-tracked trip points	2016-09-27 14:02:16 +08:00
timers	Doc: update 00-INDEX files to reflect the runnable code move	2016-10-10 07:12:09 -06:00
tpm
trace	This release cycle is rather small. Just a few fixes to tracing.	2016-10-06 11:48:41 -07:00
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
w1
watchdog	linux-kselftest-4.9-rc1-update	2016-10-14 15:17:12 -07:00
wimax
x86	x86/speculation/mds: Improve CPU buffer clear documentation	2019-05-21 18:48:56 +02:00
xtensa
zh_CN
.gitignore
00-INDEX	Doc: update 00-INDEX files to reflect the runnable code move	2016-10-10 07:12:09 -06:00
adding-syscalls.txt
applying-patches.txt	docs: Clean up bare :: lines	2016-09-20 18:46:36 -06:00
assoc_array.txt
atomic_ops.txt
bad_memory.txt
basic_profiling.txt
bcache.txt
binfmt_misc.txt
braille-console.txt
bt8xxgpio.txt
btmrvl.txt
BUG-HUNTING
bus-virt-phys-mapping.txt
cachetlb.txt
cgroup-v2.txt
Changes	kbuild: verify that $DEPMOD is installed	2018-08-17 20:59:29 +02:00
circular-buffers.txt
clk.txt
CodeOfConflict	URL changed for Linux Foundation TAB	2016-10-01 00:57:13 -06:00
CodingStyle	docs: Remove space-before-label guidance from CodingStyle	2016-09-21 15:53:31 -06:00
conf.py	docs: Fix conf.py for Sphinx 2.0	2019-06-11 12:22:43 +02:00
cpu-hotplug.txt
cpu-load.txt
cputopology.txt
crc32.txt
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt
devices.txt
digsig.txt
DMA-API-HOWTO.txt	Documentation: DMA-API-HOWTO: Fix a typo	2016-09-20 17:58:46 -06:00
DMA-API.txt	dma-mapping: add dma_{map,unmap}_resource	2016-09-26 22:16:41 +05:30
DMA-attributes.txt	dma-mapping: introduce the DMA_ATTR_NO_WARN attribute	2016-10-11 15:06:32 -07:00
dma-buf-sharing.txt
DMA-ISA-LPC.txt
docutils.conf
dontdiff
dynamic-debug-howto.txt
edac.txt
efi-stub.txt
eisa.txt
email-clients.txt	Documentation/email-clients.txt: convert it to ReST markup	2016-09-21 15:41:50 -06:00
flexible-arrays.txt
futex-requeue-pi.txt
gcc-plugins.txt
highuid.txt
HOWTO	docs: Clean up bare :: lines	2016-09-20 18:46:36 -06:00
hw_random.txt
hwspinlock.txt
index.rst	Documentation: Move L1TF to separate directory	2019-05-14 19:19:41 +02:00
init.txt
initrd.txt
Intel-IOMMU.txt
intel_txt.txt
io-mapping.txt
io_ordering.txt
iostats.txt
IPMI.txt
IRQ-affinity.txt
IRQ-domain.txt
IRQ.txt
irqflags-tracing.txt
isa.txt
isapnp.txt
java.txt
kernel-doc-nano-HOWTO.txt
kernel-docs.txt	Documentation/kernel-docs.txt: reorder based on timestamp	2016-09-20 18:54:42 -06:00
kernel-documentation.rst	This is the documentation update pull for the 4.9 merge window.	2016-10-04 13:54:07 -07:00
kernel-parameters.txt	x86/CPU/AMD: Clear RDRAND CPUID bit on AMD family 15h/16h	2019-09-06 10:19:41 +02:00
kernel-per-CPU-kthreads.txt
kobject.txt
kprobes.txt
kref.txt
kselftest.txt	kselftest: kselftest documentation improvement	2016-09-20 08:58:27 -06:00
ldm.txt
local_ops.txt
lockup-watchdogs.txt
logo.gif
logo.txt
lzo.txt
magic-number.txt
mailbox.txt
Makefile	samples: move blackfin gptimers-example from Documentation	2016-10-10 07:12:02 -06:00
Makefile.sphinx
ManagementStyle	Documentation/HOWTO: add cross-references to other documents	2016-09-20 18:41:04 -06:00
md-cluster.txt
md.txt
memory-barriers.txt
memory-hotplug.txt
men-chameleon-bus.txt
module-signing.txt
mono.txt
nommu-mmap.txt
ntb.txt
numastat.txt
oops-tracing.txt
padata.txt
parport-lowlevel.txt
parport.txt
percpu-rw-semaphore.txt
phy.txt
pi-futex.txt
pinctrl.txt
pnp.txt
preempt-locking.txt
printk-formats.txt	lib/vsprintf: Remove atomic-unsafe support for %pCr	2018-07-03 11:23:06 +02:00
pwm.txt
ramoops.txt
rbtree.txt
remoteproc.txt	remoteproc: Split driver and consumer dereferencing	2016-10-02 22:50:21 -07:00
rfkill.txt
robust-futex-ABI.txt
robust-futexes.txt
rpmsg.txt
rtc.txt
SAK.txt
SecurityBugs	Documentation/HOWTO: add cross-references to other documents	2016-09-20 18:41:04 -06:00
serial-console.txt
sgi-ioc4.txt
siphash.txt	siphash: implement HalfSipHash1-3 for hash tables	2019-08-25 10:51:42 +02:00
SM501.txt
smsc_ece1099.txt
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	Documentation/HOWTO: add cross-references to other documents	2016-09-20 18:41:04 -06:00
stable_kernel_rules.txt	Documentation: stable-kernel-rules: fix stable-tag format	2017-04-12 12:41:15 +02:00
static-keys.txt	jump_labels: Allow array initialisers	2016-09-07 09:41:11 +01:00
SubmitChecklist	docs-rst: add inter-document cross references	2016-09-21 15:43:09 -06:00
SubmittingDrivers	docs-rst: add inter-document cross references	2016-09-21 15:43:09 -06:00
SubmittingPatches	docs-rst: add inter-document cross references	2016-09-21 15:43:09 -06:00
svga.txt
sync_file.txt
sysfs-rules.txt
sysrq.txt
this_cpu_ops.txt
unaligned-memory-access.txt
unicode.txt
unshare.txt
vfio.txt
VGA-softcursor.txt
video-output.txt
vme_api.txt
volatile-considered-harmful.txt
workqueue.txt
xillybus.txt
xz.txt
zorro.txt