Merge branches 'arm/renesas', 'arm/omap', 'arm/exynos', 'x86/amd', 'x86/vt-d' and 'core' into next

Maciej W. Rozycki <macro@mips.com> <macro@imgtec.com>

Marcin Nowakowski <marcin.nowakowski@mips.com> <marcin.nowakowski@imgtec.com>

Mark Brown <broonie@sirena.org.uk>

Mark Yao <markyao0591@gmail.com> <mark.yao@rock-chips.com>

Martin Kepplinger <martink@posteo.de> <martin.kepplinger@theobroma-systems.com>

Martin Kepplinger <martink@posteo.de> <martin.kepplinger@ginzinger.com>

Matthieu CASTET <castet.matthieu@free.fr>

Description:	information about CPUs heterogeneity.

		cpu_capacity: capacity of cpu#.

What:		/sys/devices/system/cpu/vulnerabilities

		/sys/devices/system/cpu/vulnerabilities/meltdown

		/sys/devices/system/cpu/vulnerabilities/spectre_v1

		/sys/devices/system/cpu/vulnerabilities/spectre_v2

Date:		January 2018

Contact:	Linux kernel mailing list <linux-kernel@vger.kernel.org>

Description:	Information about CPU vulnerabilities

		The files are named after the code names of CPU

		vulnerabilities. The output of those files reflects the

		state of the CPUs in the system. Possible output values:

		"Not affected"	  CPU is not affected by the vulnerability

		"Vulnerable"	  CPU is affected and no mitigation in effect

		"Mitigation: $M"  CPU is affected and mitigation $M is in effect

	IPV6	IPv6 support is enabled.

	ISAPNP	ISA PnP code is enabled.

	ISDN	Appropriate ISDN support is enabled.

	ISOL	CPU Isolation is enabled.

	JOY	Appropriate joystick support is enabled.

	KGDB	Kernel debugger support is enabled.

	KVM	Kernel Virtual Machine support is enabled.

			not play well with APC CPU idle - disable it if you have

			APC and your system crashes randomly.

	apic=		[APIC,X86-32] Advanced Programmable Interrupt Controller

	apic=		[APIC,X86] Advanced Programmable Interrupt Controller

			Change the output verbosity whilst booting

			Format: { quiet (default) | verbose | debug }

			Change the amount of debugging information output

			when initialising the APIC and IO-APIC components.

			For X86-32, this can also be used to specify an APIC

			driver name.

			Format: apic=driver_name

			Examples: apic=bigsmp

	apic_extnmi=	[APIC,X86] External NMI delivery setting

			Format: { bsp (default) | all | none }

			It will be ignored when crashkernel=X,high is not used

			or memory reserved is below 4G.

	crossrelease_fullstack

			[KNL] Allow to record full stack trace in cross-release

	cryptomgr.notests

                        [KNL] Disable crypto self-tests

	isapnp=		[ISAPNP]

			Format: <RDP>,<reset>,<pci_scan>,<verbosity>

	isolcpus=	[KNL,SMP] Isolate a given set of CPUs from disturbance.

	isolcpus=	[KNL,SMP,ISOL] Isolate a given set of CPUs from disturbance.

			[Deprecated - use cpusets instead]

			Format: [flag-list,]<cpu-list>

	nosmt		[KNL,S390] Disable symmetric multithreading (SMT).

			Equivalent to smt=1.

	nospectre_v2	[X86] Disable all mitigations for the Spectre variant 2

			(indirect branch prediction) vulnerability. System may

			allow data leaks with this option, which is equivalent

			to spectre_v2=off.

	noxsave		[BUGS=X86] Disables x86 extended register state save

			and restore using xsave. The kernel will fallback to

			enabling legacy floating-point and sse state.

			Valid arguments: on, off

			Default: on

	nohz_full=	[KNL,BOOT]

	nohz_full=	[KNL,BOOT,SMP,ISOL]

			The argument is a cpu list, as described above.

			In kernels built with CONFIG_NO_HZ_FULL=y, set

			the specified list of CPUs whose tick will be stopped

		pcie_scan_all	Scan all possible PCIe devices.  Otherwise we

				only look for one device below a PCIe downstream

				port.

		big_root_window	Try to add a big 64bit memory window to the PCIe

				root complex on AMD CPUs. Some GFX hardware

				can resize a BAR to allow access to all VRAM.

				Adding the window is slightly risky (it may

				conflict with unreported devices), so this

				taints the kernel.

	pcie_aspm=	[PCIE] Forcibly enable or disable PCIe Active State Power

			Management.

	pt.		[PARIDE]

			See Documentation/blockdev/paride.txt.

	pti=		[X86_64] Control Page Table Isolation of user and

			kernel address spaces.  Disabling this feature

			removes hardening, but improves performance of

			system calls and interrupts.

			on   - unconditionally enable

			off  - unconditionally disable

			auto - kernel detects whether your CPU model is

			       vulnerable to issues that PTI mitigates

			Not specifying this option is equivalent to pti=auto.

	nopti		[X86_64]

			Equivalent to pti=off

	pty.legacy_count=

			[KNL] Number of legacy pty's. Overwrites compiled-in

			default number.

	sonypi.*=	[HW] Sony Programmable I/O Control Device driver

			See Documentation/laptops/sonypi.txt

	spectre_v2=	[X86] Control mitigation of Spectre variant 2

			(indirect branch speculation) vulnerability.

			on   - unconditionally enable

			off  - unconditionally disable

			auto - kernel detects whether your CPU model is

			       vulnerable

			Selecting 'on' will, and 'auto' may, choose a

			mitigation method at run time according to the

			CPU, the available microcode, the setting of the

			CONFIG_RETPOLINE configuration option, and the

			compiler with which the kernel was built.

			Specific mitigations can also be selected manually:

			retpoline	  - replace indirect branches

			retpoline,generic - google's original retpoline

			retpoline,amd     - AMD-specific minimal thunk

			Not specifying this option is equivalent to

			spectre_v2=auto.

	spia_io_base=	[HW,MTD]

	spia_fio_base=

	spia_pedr=

a sysfs attribute called "force_power".

For example the intel-wmi-thunderbolt driver exposes this attribute in:

  /sys/devices/platform/PNP0C14:00/wmi_bus/wmi_bus-PNP0C14:00/86CCFD48-205E-4A77-9C48-2021CBEDE341/force_power

  /sys/bus/wmi/devices/86CCFD48-205E-4A77-9C48-2021CBEDE341/force_power

  To force the power to on, write 1 to this attribute file.

  To disable force power, write 0 to this attribute file.