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Jiri Kosina 233b9d7df0 x86/speculation: Enable cross-hyperthread spectre v2 STIBP mitigation commit `53c613fe63` upstream. STIBP is a feature provided by certain Intel ucodes / CPUs. This feature (once enabled) prevents cross-hyperthread control of decisions made by indirect branch predictors. Enable this feature if - the CPU is vulnerable to spectre v2 - the CPU supports SMT and has SMT siblings online - spectre_v2 mitigation autoselection is enabled (default) After some previous discussion, this leaves STIBP on all the time, as wrmsr on crossing kernel boundary is a no-no. This could perhaps later be a bit more optimized (like disabling it in NOHZ, experiment with disabling it in idle, etc) if needed. Note that the synchronization of the mask manipulation via newly added spec_ctrl_mutex is currently not strictly needed, as the only updater is already being serialized by cpu_add_remove_lock, but let's make this a little bit more future-proof. Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: "WoodhouseDavid" <dwmw@amazon.co.uk> Cc: Andi Kleen <ak@linux.intel.com> Cc: Tim Chen <tim.c.chen@linux.intel.com> Cc: "SchauflerCasey" <casey.schaufler@intel.com> Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/nycvar.YFH.7.76.1809251438240.15880@cbobk.fhfr.pm Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-11-13 11:08:19 -08:00
arch	x86/speculation: Enable cross-hyperthread spectre v2 STIBP mitigation	2018-11-13 11:08:19 -08:00
block	block: make sure writesame bio is aligned with logical block size	2018-11-13 11:08:16 -08:00
certs	export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR()	2018-08-22 23:21:44 +09:00
crypto	Revert "net: simplify sock_poll_wait"	2018-11-04 14:50:51 +01:00
Documentation	Code of Conduct: Change the contact email address	2018-10-22 07:33:36 +01:00
drivers	mailbox: PCC: handle parse error	2018-11-13 11:08:18 -08:00
firmware	kbuild: remove all dummy assignments to obj-	2017-11-18 11:46:06 +09:00
fs	jffs2: free jffs2_sb_info through jffs2_kill_sb()	2018-11-13 11:08:16 -08:00
include	bpf: fix partial copy of map_ptr when dst is scalar	2018-11-13 11:08:14 -08:00
init	Kbuild updates for v4.19 (2nd)	2018-08-25 13:40:38 -07:00
ipc	ipc/shm.c: use ERR_CAST() for shm_lock() error return	2018-10-05 16:32:04 -07:00
kernel	x86/speculation: Enable cross-hyperthread spectre v2 STIBP mitigation	2018-11-13 11:08:19 -08:00
lib	test_ida: Fix lockdep warning	2018-10-15 16:31:29 -04:00
LICENSES	LICENSES: Remove CC-BY-SA-4.0 license text	2018-10-18 11:28:50 +02:00
mm	mremap: properly flush TLB before releasing the page	2018-10-18 11:30:52 +02:00
net	net: bridge: remove ipv6 zero address check in mcast queries	2018-11-04 14:50:54 +01:00
samples	samples: disable CONFIG_SAMPLES for UML	2018-10-11 02:15:46 +09:00
scripts	Kbuild fixes for v4.19 (2nd)	2018-10-11 19:23:07 +02:00
security	Revert "uapi/linux/keyctl.h: don't use C++ reserved keyword as a struct member name"	2018-09-25 13:28:58 +02:00
sound	ALSA: hda - Fix incorrect clearance of thinkpad_acpi hooks	2018-11-13 11:08:19 -08:00
tools	net/ipv6: Allow onlink routes to have a device mismatch if it is the default route	2018-11-04 14:50:52 +01:00
usr	initramfs: move gen_initramfs_list.sh from scripts/ to usr/	2018-08-22 23:21:44 +09:00
virt	KVM: Remove obsolete kvm_unmap_hva notifier backend	2018-09-07 15:06:02 +02:00
.clang-format	clang-format: Set IndentWrappedFunctionNames false	2018-08-01 18:38:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes	.gitattributes: set git diff driver for C source code files	2016-10-07 18:46:30 -07:00
.gitignore	Kbuild updates for v4.17 (2nd)	2018-04-15 17:21:30 -07:00
.mailmap	libnvdimm-for-4.19_misc	2018-08-25 18:13:10 -07:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	9p: remove Ron Minnich from MAINTAINERS	2018-08-17 16:20:26 -07:00
Kbuild	Kbuild updates for v4.15	2017-11-17 17:45:29 -08:00
Kconfig	kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt	2018-08-02 08:06:55 +09:00
MAINTAINERS	MAINTAINERS: Add an entry for the code of conduct	2018-10-22 07:33:36 +01:00
Makefile	Linux 4.19.1	2018-11-04 14:50:54 +01:00
README	Docs: Added a pointer to the formatted docs to README	2018-03-21 09:02:53 -06:00

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.