Merge/sound upstream 20251003

.get_maintainer.ignore

@@ -1,5 +1,6 @@
 Alan Cox <alan@lxorguk.ukuu.org.uk>
 Alan Cox <root@hraefn.swansea.linux.org.uk>
+Alyssa Rosenzweig <alyssa@rosenzweig.io>
 Christoph Hellwig <hch@lst.de>
 Jeff Kirsher <jeffrey.t.kirsher@intel.com>
 Marc Gonzalez <marc.w.gonzalez@free.fr>

.mailmap

@@ -134,6 +134,7 @@ Ben M Cahill <ben.m.cahill@intel.com>
 Ben Widawsky <bwidawsk@kernel.org> <ben@bwidawsk.net>
 Ben Widawsky <bwidawsk@kernel.org> <ben.widawsky@intel.com>
 Ben Widawsky <bwidawsk@kernel.org> <benjamin.widawsky@intel.com>
+Bence Csókás <bence98@sch.bme.hu> <csokas.bence@prolan.hu>
 Benjamin Poirier <benjamin.poirier@gmail.com> <bpoirier@suse.de>
 Benjamin Tissoires <bentiss@kernel.org> <benjamin.tissoires@gmail.com>
 Benjamin Tissoires <bentiss@kernel.org> <benjamin.tissoires@redhat.com>
@@ -623,6 +624,7 @@ Paulo Alcantara <pc@manguebit.org> <palcantara@suse.com>
 Paulo Alcantara <pc@manguebit.org> <pc@manguebit.com>
 Pavankumar Kondeti <quic_pkondeti@quicinc.com> <pkondeti@codeaurora.org>
 Peter A Jonsson <pj@ludd.ltu.se>
+Peter Hilber <peter.hilber@oss.qualcomm.com> <quic_philber@quicinc.com>
 Peter Oruba <peter.oruba@amd.com>
 Peter Oruba <peter@oruba.de>
 Pierre-Louis Bossart <pierre-louis.bossart@linux.dev> <pierre-louis.bossart@linux.intel.com>

CREDITS

@@ -3912,6 +3912,12 @@ S: C/ Federico Garcia Lorca 1 10-A
 S: Sevilla 41005
 S: Spain
 
+N: Björn Töpel
+E: bjorn@kernel.org
+D: AF_XDP
+S: Gothenburg
+S: Sweden
+
 N: Linus Torvalds
 E: torvalds@linux-foundation.org
 D: Original kernel hacker

Documentation/ABI/testing/sysfs-bus-event_source-devices-vpa-dtl

@@ -0,0 +1,25 @@
+What:           /sys/bus/event_source/devices/vpa_dtl/format
+Date:           February 2025
+Contact:        Linux on PowerPC Developer List <linuxppc-dev at lists.ozlabs.org>
+Description:    Read-only. Attribute group to describe the magic bits
+                that go into perf_event_attr.config for a particular pmu.
+                (See ABI/testing/sysfs-bus-event_source-devices-format).
+
+                Each attribute under this group defines a bit range of the
+                perf_event_attr.config. Supported attribute are listed
+                below::
+
+				event  = "config:0-7"  - event ID
+
+		For example::
+
+		  dtl_cede = "event=0x1"
+
+What:           /sys/bus/event_source/devices/vpa_dtl/events
+Date:           February 2025
+Contact:        Linux on PowerPC Developer List <linuxppc-dev at lists.ozlabs.org>
+Description:	(RO) Attribute group to describe performance monitoring events
+                for the Virtual Processor Dispatch Trace Log. Each attribute in
+		this group describes a single performance monitoring event
+		supported by vpa_dtl pmu.  The name of the file is the name of
+		the event (See ABI/testing/sysfs-bus-event_source-devices-events).

Documentation/ABI/testing/sysfs-class-power

@@ -553,6 +553,43 @@ Description:
 			Integer > 0: representing full cycles
 			Integer = 0: cycle_count info is not available
 
+What:		/sys/class/power_supply/<supply_name>/internal_resistance
+Date:		August 2025
+Contact:	linux-arm-msm@vger.kernel.org
+Description:
+		Represent the battery's internal resistance, often referred
+		to as Equivalent Series Resistance (ESR). It is a dynamic
+		parameter that reflects the opposition to current flow within
+		the cell. It is not a fixed value but varies significantly
+		based on several operational conditions, including battery
+		state of charge (SoC), temperature, and whether the battery
+		is in a charging or discharging state.
+
+		Access: Read
+
+		Valid values: Represented in microohms
+
+What:		/sys/class/power_supply/<supply_name>/state_of_health
+Date:		August 2025
+Contact:	linux-arm-msm@vger.kernel.org
+Description:
+		The state_of_health parameter quantifies the overall condition
+		of a battery as a percentage, reflecting its ability to deliver
+		rated performance relative to its original specifications. It is
+		dynamically computed using a combination of learned capacity
+		and impedance-based degradation indicators, both of which evolve
+		over the battery's lifecycle.
+		Note that the exact algorithms are kept secret by most battery
+		vendors and the value from different battery vendors cannot be
+		compared with each other as there is no vendor-agnostic definition
+		of "performance". Also this usually cannot be used for any
+		calculations (i.e. this is not the factor between charge_full and
+		charge_full_design).
+
+		Access: Read
+
+		Valid values: 0 - 100 (percent)
+
 **USB Properties**
 
 What:		/sys/class/power_supply/<supply_name>/input_current_limit

Documentation/ABI/testing/sysfs-devices-power

@@ -274,15 +274,15 @@ What:		/sys/devices/.../power/runtime_active_time
 Date:		Jul 2010
 Contact:	Arjan van de Ven <arjan@linux.intel.com>
 Description:
-		Reports the total time that the device has been active.
-		Used for runtime PM statistics.
+		Reports the total time that the device has been active, in
+		milliseconds. Used for runtime PM statistics.
 
 What:		/sys/devices/.../power/runtime_suspended_time
 Date:		Jul 2010
 Contact:	Arjan van de Ven <arjan@linux.intel.com>
 Description:
-		Reports total time that the device has been suspended.
-		Used for runtime PM statistics.
+		Reports total time that the device has been suspended, in
+		milliseconds. Used for runtime PM statistics.
 
 What:		/sys/devices/.../power/runtime_usage
 Date:		Apr 2010

Documentation/ABI/testing/sysfs-devices-system-cpu

@@ -586,6 +586,7 @@ What:		/sys/devices/system/cpu/vulnerabilities
 		/sys/devices/system/cpu/vulnerabilities/srbds
 		/sys/devices/system/cpu/vulnerabilities/tsa
 		/sys/devices/system/cpu/vulnerabilities/tsx_async_abort
+		/sys/devices/system/cpu/vulnerabilities/vmscape
 Date:		January 2018
 Contact:	Linux kernel mailing list <linux-kernel@vger.kernel.org>
 Description:	Information about CPU vulnerabilities

Documentation/admin-guide/cgroup-v2.rst

@@ -15,6 +15,9 @@ v1 is available under :ref:`Documentation/admin-guide/cgroup-v1/index.rst <cgrou
 
 .. CONTENTS
 
+   [Whenever any new section is added to this document, please also add
+    an entry here.]
+
    1. Introduction
      1-1. Terminology
      1-2. What is cgroup?
@@ -25,9 +28,10 @@ v1 is available under :ref:`Documentation/admin-guide/cgroup-v1/index.rst <cgrou
        2-2-2. Threads
      2-3. [Un]populated Notification
      2-4. Controlling Controllers
-       2-4-1. Enabling and Disabling
-       2-4-2. Top-down Constraint
-       2-4-3. No Internal Process Constraint
+       2-4-1. Availability
+       2-4-2. Enabling and Disabling
+       2-4-3. Top-down Constraint
+       2-4-4. No Internal Process Constraint
      2-5. Delegation
        2-5-1. Model of Delegation
        2-5-2. Delegation Containment
@@ -61,14 +65,15 @@ v1 is available under :ref:`Documentation/admin-guide/cgroup-v1/index.rst <cgrou
        5-4-1. PID Interface Files
      5-5. Cpuset
        5.5-1. Cpuset Interface Files
-     5-6. Device
+     5-6. Device controller
      5-7. RDMA
        5-7-1. RDMA Interface Files
      5-8. DMEM
+       5-8-1. DMEM Interface Files
      5-9. HugeTLB
        5.9-1. HugeTLB Interface Files
      5-10. Misc
-       5.10-1 Miscellaneous cgroup Interface Files
+       5.10-1 Misc Interface Files
        5.10-2 Migration and Ownership
      5-11. Others
        5-11-1. perf_event
@@ -1001,6 +1006,24 @@ All cgroup core files are prefixed with "cgroup."
 		Total number of dying cgroup subsystems (e.g. memory
 		cgroup) at and beneath the current cgroup.
 
+  cgroup.stat.local
+	A read-only flat-keyed file which exists in non-root cgroups.
+	The following entry is defined:
+
+	  frozen_usec
+		Cumulative time that this cgroup has spent between freezing and
+		thawing, regardless of whether by self or ancestor groups.
+		NB: (not) reaching "frozen" state is not accounted here.
+
+		Using the following ASCII representation of a cgroup's freezer
+		state, ::
+
+			       1    _____
+			frozen 0 __/     \__
+			          ab    cd
+
+		the duration being measured is the span between a and c.
+
   cgroup.freeze
 	A read-write single value file which exists on non-root cgroups.
 	Allowed values are "0" and "1". The default is "0".

Documentation/admin-guide/hw-vuln/attack_vector_controls.rst

@@ -218,6 +218,7 @@ SRSO                  X              X            X              X
 SSB                                  X
 TAA                   X              X            X              X            *       (Note 2)
 TSA                   X              X            X              X
+VMSCAPE                                           X
 =============== ============== ============ ============= ============== ============ ========
 
 Notes:

Documentation/admin-guide/hw-vuln/index.rst

@@ -26,3 +26,4 @@ are configurable at compile, boot or run time.
    rsb
    old_microcode
    indirect-target-selection
+   vmscape

Documentation/admin-guide/hw-vuln/vmscape.rst

@@ -0,0 +1,110 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+VMSCAPE
+=======
+
+VMSCAPE is a vulnerability that may allow a guest to influence the branch
+prediction in host userspace. It particularly affects hypervisors like QEMU.
+
+Even if a hypervisor may not have any sensitive data like disk encryption keys,
+guest-userspace may be able to attack the guest-kernel using the hypervisor as
+a confused deputy.
+
+Affected processors
+-------------------
+
+The following CPU families are affected by VMSCAPE:
+
+**Intel processors:**
+  - Skylake generation (Parts without Enhanced-IBRS)
+  - Cascade Lake generation - (Parts affected by ITS guest/host separation)
+  - Alder Lake and newer (Parts affected by BHI)
+
+Note that, BHI affected parts that use BHB clearing software mitigation e.g.
+Icelake are not vulnerable to VMSCAPE.
+
+**AMD processors:**
+  - Zen series (families 0x17, 0x19, 0x1a)
+
+** Hygon processors:**
+ - Family 0x18
+
+Mitigation
+----------
+
+Conditional IBPB
+----------------
+
+Kernel tracks when a CPU has run a potentially malicious guest and issues an
+IBPB before the first exit to userspace after VM-exit. If userspace did not run
+between VM-exit and the next VM-entry, no IBPB is issued.
+
+Note that the existing userspace mitigation against Spectre-v2 is effective in
+protecting the userspace. They are insufficient to protect the userspace VMMs
+from a malicious guest. This is because Spectre-v2 mitigations are applied at
+context switch time, while the userspace VMM can run after a VM-exit without a
+context switch.
+
+Vulnerability enumeration and mitigation is not applied inside a guest. This is
+because nested hypervisors should already be deploying IBPB to isolate
+themselves from nested guests.
+
+SMT considerations
+------------------
+
+When Simultaneous Multi-Threading (SMT) is enabled, hypervisors can be
+vulnerable to cross-thread attacks. For complete protection against VMSCAPE
+attacks in SMT environments, STIBP should be enabled.
+
+The kernel will issue a warning if SMT is enabled without adequate STIBP
+protection. Warning is not issued when:
+
+- SMT is disabled
+- STIBP is enabled system-wide
+- Intel eIBRS is enabled (which implies STIBP protection)
+
+System information and options
+------------------------------
+
+The sysfs file showing VMSCAPE mitigation status is:
+
+  /sys/devices/system/cpu/vulnerabilities/vmscape
+
+The possible values in this file are:
+
+ * 'Not affected':
+
+   The processor is not vulnerable to VMSCAPE attacks.
+
+ * 'Vulnerable':
+
+   The processor is vulnerable and no mitigation has been applied.
+
+ * 'Mitigation: IBPB before exit to userspace':
+
+   Conditional IBPB mitigation is enabled. The kernel tracks when a CPU has
+   run a potentially malicious guest and issues an IBPB before the first
+   exit to userspace after VM-exit.
+
+ * 'Mitigation: IBPB on VMEXIT':
+
+   IBPB is issued on every VM-exit. This occurs when other mitigations like
+   RETBLEED or SRSO are already issuing IBPB on VM-exit.
+
+Mitigation control on the kernel command line
+----------------------------------------------
+
+The mitigation can be controlled via the ``vmscape=`` command line parameter:
+
+ * ``vmscape=off``:
+
+   Disable the VMSCAPE mitigation.
+
+ * ``vmscape=ibpb``:
+
+   Enable conditional IBPB mitigation (default when CONFIG_MITIGATION_VMSCAPE=y).
+
+ * ``vmscape=force``:
+
+   Force vulnerability detection and mitigation even on processors that are
+   not known to be affected.