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Pawan Gupta 77018fb9ef x86/rfds: Mitigate Register File Data Sampling (RFDS) 
commit 8076fcde01 upstream.

RFDS is a CPU vulnerability that may allow userspace to infer kernel
stale data previously used in floating point registers, vector registers
and integer registers. RFDS only affects certain Intel Atom processors.

Intel released a microcode update that uses VERW instruction to clear
the affected CPU buffers. Unlike MDS, none of the affected cores support
SMT.

Add RFDS bug infrastructure and enable the VERW based mitigation by
default, that clears the affected buffers just before exiting to
userspace. Also add sysfs reporting and cmdline parameter
"reg_file_data_sampling" to control the mitigation.

For details see:
Documentation/admin-guide/hw-vuln/reg-file-data-sampling.rst

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2024-03-15 10:48:22 -04:00
..
ABI x86/rfds: Mitigate Register File Data Sampling (RFDS) 2024-03-15 10:48:22 -04:00
accel accel/qaic: Add documentation for AIC100 accelerator driver 2023-04-06 08:23:03 +02:00
accounting docs: psi: use correct config name 2023-07-31 09:54:17 -06:00
admin-guide x86/rfds: Mitigate Register File Data Sampling (RFDS) 2024-03-15 10:48:22 -04:00
arch x86/bugs: Use ALTERNATIVE() instead of mds_user_clear static key 2024-03-06 14:48:44 +00:00
block Documentation work keeps chugging along; stuff for 6.6 includes: 2023-08-30 20:05:42 -07:00
bpf Including fixes from netfilter and bpf. 2023-09-07 18:33:07 -07:00
cdrom Documentation: use capitalization for chapters and acronyms 2023-05-16 12:49:31 -06:00
core-api workqueue: doc: Fix function and sysfs path errors 2023-10-12 07:27:22 -10:00
cpu-freq Docs/subsystem-apis: Remove '[The ]Linux' prefixes from titles of listed documents 2023-01-24 15:27:08 -07:00
crypto docs: crypto: async-tx-api: fix typo in struct name 2023-06-09 01:59:30 -06:00
dev-tools LoongArch changes for v6.6 2023-09-08 12:16:52 -07:00
devicetree dt-bindings: net: snps,dwmac: Tx coe unsupported 2024-01-31 16:18:58 -08:00
doc-guide Documentation: doc-guide: use '%' constant indicator in Return: examples 2023-07-14 13:16:59 -06:00
driver-api PCI/P2PDMA: Remove reference to pci_p2pdma_map_sg() 2024-01-25 15:35:47 -08:00
fault-injection Documentation: Fix typos 2023-08-18 11:29:03 -06:00
fb Documentation: Fix typos 2023-08-18 11:29:03 -06:00
features LoongArch changes for v6.6 2023-09-08 12:16:52 -07:00
filesystems rename(): fix the locking of subdirectories 2024-01-31 16:18:57 -08:00
firmware-guide Documentation work keeps chugging along; stuff for 6.6 includes: 2023-08-30 20:05:42 -07:00
firmware_class firmware: revamp firmware documentation 2017-01-11 09:42:59 +01:00
fpga Documentation: use capitalization for chapters and acronyms 2023-05-16 12:49:31 -06:00
gpu drm: Allow drivers to indicate the damage helpers to ignore damage clips 2024-01-31 16:19:08 -08:00
hid HID: Add introduction about HID for non-kernel programmers 2023-08-07 13:24:36 +02:00
hwmon Documentation work keeps chugging along; stuff for 6.6 includes: 2023-08-30 20:05:42 -07:00
i2c i2c: i801: Add support for Intel Birch Stream SoC 2023-11-28 17:19:46 +00:00
iio docs: iio: add documentation for BNO055 driver 2022-09-21 18:42:56 +01:00
images docs: add SVG version of the Linux logo 2022-06-01 09:32:45 -06:00
infiniband RDMA/core: Remove FMR device ops 2020-06-02 20:32:54 -03:00
input input: docs: pxrc: remove reference to phoenix-sim 2023-08-28 12:43:32 -06:00
isdn Documentation: isdn: correct spelling 2023-02-10 16:28:13 -08:00
kbuild Documentation: kbuild: explain handling optional dependencies 2023-09-25 16:01:05 +09:00
kernel-hacking Documentation: Add document for false sharing 2023-04-10 16:46:11 -06:00
leds - New Drivers 2023-07-03 11:26:05 -07:00
litmus-tests LKMM scripting updates for v6.4 2023-04-24 12:02:25 -07:00
livepatch Documentation: Fix typos 2023-08-18 11:29:03 -06:00
locking Documentation: Fix typos 2023-08-18 11:29:03 -06:00
maintainer Documentation work keeps chugging along; stuff for 6.6 includes: 2023-08-30 20:05:42 -07:00
mhi docs: Add documentation for MHI bus 2020-03-19 07:41:04 +01:00
misc-devices Documentation: Add TI TPS6594 PFSM 2023-06-15 13:41:53 +02:00
mm Add x86 shadow stack support 2023-08-31 12:20:12 -07:00
netlabel docs: add some directories to the main documentation index 2019-07-15 11:03:03 -03:00
netlink netlink: specs: devlink: fix reply command values 2023-10-13 17:27:27 -07:00
networking devlink: Fix command annotation documentation 2024-02-23 09:24:50 +01:00
nvdimm nvdimm: fixes to maintainter-entry-profile 2020-05-25 10:19:19 -06:00
nvme docs, nvme: add a feature and quirk policy document 2022-12-28 05:37:12 -10:00
PCI Merge branch 'pci/misc' 2023-08-29 11:03:57 -05:00
pcmcia Documentation: use capitalization for chapters and acronyms 2023-05-16 12:49:31 -06:00
peci Docs/subsystem-apis: Remove '[The ]Linux' prefixes from titles of listed documents 2023-01-24 15:27:08 -07:00
power Documentation: Fix typos 2023-08-18 11:29:03 -06:00
powerpc docs: kernel_feat.py: fix potential command injection 2024-01-31 16:18:46 -08:00
process rust: upgrade to Rust 1.73.0 2024-02-16 19:10:43 +01:00
RCU Docs/RCU/rculist_nulls: Fix text about atomic_set_release() 2023-07-14 14:55:57 -07:00
riscv docs: kernel_feat.py: fix potential command injection 2024-01-31 16:18:46 -08:00
rust docs: rust: update Rust docs output path 2023-10-19 16:39:03 +02:00
scheduler Documentation work keeps chugging along; stuff for 6.6 includes: 2023-08-30 20:05:42 -07:00
scsi SCSI misc on 20230902 2023-09-02 12:02:41 -07:00
security Documentation: Fix typos 2023-08-18 11:29:03 -06:00
sound ASoC: doc: Fix undefined SND_SOC_DAPM_NOPM argument 2024-02-05 20:14:26 +00:00
sphinx docs: kernel_feat.py: fix build error for missing files 2024-02-23 09:25:16 +01:00
sphinx-static docs: Add more information to the HTML sidebar 2023-02-08 13:28:27 -07:00
spi Documentation: Fix typos 2023-08-18 11:29:03 -06:00
staging Documentation: use capitalization for chapters and acronyms 2023-05-16 12:49:31 -06:00
target scsi: target: docs: Remove tcm_mod_builder.py 2023-06-28 22:01:32 -04:00
timers Documentation: use capitalization for chapters and acronyms 2023-05-16 12:49:31 -06:00
tools rtla: fix a example in rtla-timerlat-hist.rst 2023-09-22 14:44:04 +02:00
trace Documentation: probes: Add a new ret_ip callback parameter 2023-10-17 10:21:45 +09:00
translations docs: kernel_feat.py: fix potential command injection 2024-01-31 16:18:46 -08:00
usb USB / Thunderbolt / PHY driver update for 6.6-rc1 2023-09-01 09:23:34 -07:00
userspace-api Including fixes from netfilter and bpf. 2023-09-07 18:33:07 -07:00
virt ARM: 2023-09-07 13:52:20 -07:00
w1 Documentation: Fix typos 2023-08-18 11:29:03 -06:00
watchdog Documentation: Fix typos 2023-08-18 11:29:03 -06:00
wmi Documentation work keeps chugging along; stuff for 6.6 includes: 2023-08-30 20:05:42 -07:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
atomic_bitops.txt wait_on_bit: add an acquire memory barrier 2022-08-26 09:30:25 -07:00
atomic_t.txt Documentation: Fixed a typo in atomic_t.txt 2023-01-03 20:47:04 -08:00
Changes docs: add back 'Documentation/Changes' file (as symlink) 2016-12-14 16:30:12 -08:00
CodingStyle doc: re-add CodingStyle and SubmittingPatches 2016-10-24 08:12:35 -02:00
conf.py docs: Instruct LaTeX to cope with deeper nesting 2024-03-01 13:34:58 +01:00
docutils.conf doc-rst: Add missing newline at end of file 2019-06-20 14:16:56 -06:00
dontdiff scripts: remove bin2c 2023-01-26 12:43:33 +09:00
index.rst docs: create a top-level arch/ directory 2023-03-23 13:27:27 -06:00
Kconfig Documentation: Avoid duplicate Kconfig inclusion 2023-01-19 13:56:34 -07:00
Makefile docs: Integrate rustdoc generation into htmldocs 2023-07-21 15:08:46 -06:00
memory-barriers.txt locking/memory-barriers.txt: Improve documentation for writel() example 2023-01-03 20:47:04 -08:00
SubmittingPatches doc: re-add CodingStyle and SubmittingPatches 2016-10-24 08:12:35 -02:00
subsystem-apis.rst docs: consolidate networking interfaces 2023-07-21 14:54:50 -06:00