linux.git/drivers/resctrl, branch v7.1-rc4 Linux kernel source tree arm_mpam: Check whether the config array is allocated before destroying it 2026-05-14T08:52:05+00:00 James Morse james.morse@arm.com 2026-05-08T16:23:39+00:00 6ccbb613b42a1f1ba7bfd547a148f644a902a25c __destroy_component_cfg() is called to free the configuration array. It uses the embedded 'garbage' structure, which means the array has to be allocated. If __destroy_component_cfg() is called from mpam_disable() before the configuration was ever allocated, then a NULL pointer is dereferenced. Check for this case and return early if the configuration is not allocated. __destroy_component_cfg() also frees the mbwu_state as this is allocated by __allocate_component_cfg(). As the mbwu_state is allocated after comp->cfg is set, and is also under mpam_list_lock, only the first pointer needs checking. Fixes: 3bd04fe7d807 ("arm_mpam: Extend reset logic to allow devices to be reset any time") Cc: <stable@vger.kernel.org> Signed-off-by: James Morse <james.morse@arm.com> Reviewed-by: Ben Horgan <ben.horgan@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 
__destroy_component_cfg() is called to free the configuration array.
It uses the embedded 'garbage' structure, which means the array has
to be allocated.

If __destroy_component_cfg() is called from mpam_disable() before the
configuration was ever allocated, then a NULL pointer is dereferenced.

Check for this case and return early if the configuration is not
allocated.

__destroy_component_cfg() also frees the mbwu_state as this is allocated
by __allocate_component_cfg(). As the mbwu_state is allocated after
comp->cfg is set, and is also under mpam_list_lock, only the first
pointer needs checking.

Fixes: 3bd04fe7d807 ("arm_mpam: Extend reset logic to allow devices to be reset any time")
Cc: <stable@vger.kernel.org>
Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Ben Horgan <ben.horgan@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arm_mpam: Fix false positive assert failure during mpam_disable() 2026-05-14T08:52:00+00:00 James Morse james.morse@arm.com 2026-05-08T16:23:38+00:00 f1caff3335ea6eab88cdc84ec8f2e3c45ca05486 mpam_assert_partid_sizes_fixed() is used to document that the caller doesn't expect the discovered PARTID size to change while it is walking a list sized by PARTID. Typically the MSC state is not written to until all the MSC have been discovered and this value is set. However, if discovering the MSC fails and schedules mpam_disable(), then the MSC state is written to reset it. In this case the discovered PARTID size may be become smaller - but only PARTID 0 will be used once resctrl_exit() has been called. Skip the WARN_ON_ONCE() if mpam_disable_reason has been set. Fixes: 3bd04fe7d807 ("arm_mpam: Extend reset logic to allow devices to be reset any time") Cc: <stable@vger.kernel.org> Signed-off-by: James Morse <james.morse@arm.com> Reviewed-by: Ben Horgan <ben.horgan@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 
mpam_assert_partid_sizes_fixed() is used to document that the caller
doesn't expect the discovered PARTID size to change while it is walking
a list sized by PARTID. Typically the MSC state is not written to until
all the MSC have been discovered and this value is set.

However, if discovering the MSC fails and schedules mpam_disable(),
then the MSC state is written to reset it. In this case the
discovered PARTID size may be become smaller - but only PARTID 0
will be used once resctrl_exit() has been called.

Skip the WARN_ON_ONCE() if mpam_disable_reason has been set.

Fixes: 3bd04fe7d807 ("arm_mpam: Extend reset logic to allow devices to be reset any time")
Cc: <stable@vger.kernel.org>
Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Ben Horgan <ben.horgan@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arm_mpam: Improve check for whether or not NRDY is hardware managed 2026-05-14T08:51:55+00:00 Ben Horgan ben.horgan@arm.com 2026-05-07T15:28:14+00:00 ccad6001be5c38426ccf45790c411467ad3c03c6 mpam_ris_hw_probe_csu_nrdy() sets and clears MSMON_CSU.NRDY and checks whether it's configuration sticks. However, hardware isn't given a chance to disagree. Based on rule LRTGP, in MPAM specification IHI0099 version B.b, the hardware will set NRDY if it needs time to establish a count after a configuration change. Enable the monitor so that NRDY becomes relevant and change the configuration after clearing NRDY to try and coax the hardware into setting it. Fixes: 8c90dc68a5de ("arm_mpam: Probe the hardware features resctrl supports") Cc: <stable@vger.kernel.org> Signed-off-by: Ben Horgan <ben.horgan@arm.com> Reviewed-by: James Morse <james.morse@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 
mpam_ris_hw_probe_csu_nrdy() sets and clears MSMON_CSU.NRDY and checks
whether it's configuration sticks. However, hardware isn't given a chance
to disagree. Based on rule LRTGP, in MPAM specification IHI0099 version
B.b, the hardware will set NRDY if it needs time to establish a count after
a configuration change.

Enable the monitor so that NRDY becomes relevant and change the
configuration after clearing NRDY to try and coax the hardware into setting
it.

Fixes: 8c90dc68a5de ("arm_mpam: Probe the hardware features resctrl supports")
Cc: <stable@vger.kernel.org>
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arm_mpam: Pretend that NRDY is always hardware managed 2026-05-14T08:51:50+00:00 Ben Horgan ben.horgan@arm.com 2026-05-07T15:28:13+00:00 4387970bbd84fd14e0c49c3089c5061ccd86b98a Rule ZTXDS of the MPAM specification, IHI009 version B.b, states: "If a monitor does not support automatic updates of NRDY, software can use that bit for any purpose." As software is not reliably informed whether or not the monitor supports automatic updates of NRDY always assume that hardware may manage NRDY but don't rely on it. When NRDY is truly untouched by hardware then, as it is written to 0 on configuration, it will always read 0. At probe it's checked if MSMON_CSU.NRDY and MSMON_MBWU.NRDY are hardware managed but not MSMON_MBWU_L.NDRY. Specialize the checking for hardware managed NRDY to CSU counters as this is the only case where hardware management makes sense. Continue to inform the user if MSMON_CSU.NRDY appears to be hardware managed but the firmware doesn't provide the associated time limit for the automatic clearing of NRDY. Remove the NRDY feature flags as they are now unused. Fixes: 8c90dc68a5de ("arm_mpam: Probe the hardware features resctrl supports") Cc: <stable@vger.kernel.org> Signed-off-by: Ben Horgan <ben.horgan@arm.com> Reviewed-by: James Morse <james.morse@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 
Rule ZTXDS of the MPAM specification, IHI009 version B.b, states: "If a
monitor does not support automatic updates of NRDY, software can use that
bit for any purpose."

As software is not reliably informed whether or not the monitor supports
automatic updates of NRDY always assume that hardware may manage NRDY but
don't rely on it. When NRDY is truly untouched by hardware then, as it is
written to 0 on configuration, it will always read 0.

At probe it's checked if MSMON_CSU.NRDY and MSMON_MBWU.NRDY are hardware
managed but not MSMON_MBWU_L.NDRY. Specialize the checking for hardware
managed NRDY to CSU counters as this is the only case where hardware
management makes sense. Continue to inform the user if MSMON_CSU.NRDY
appears to be hardware managed but the firmware doesn't provide the
associated time limit for the automatic clearing of NRDY. Remove the NRDY
feature flags as they are now unused.

Fixes: 8c90dc68a5de ("arm_mpam: Probe the hardware features resctrl supports")
Cc: <stable@vger.kernel.org>
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arm_mpam: Fix monitor instance selection when checking for hardware NRDY 2026-05-14T08:51:41+00:00 Ben Horgan ben.horgan@arm.com 2026-05-07T15:28:12+00:00 1ef2a89584b7b788b2603590d886db076b2f24cc In _mpam_ris_hw_probe_hw_nrdy() a new register value to select the first monitor and relevant RIS is prepared in mon_sel. However, it is written to the monitor value register, e.g. MSMON_CSU, rather than MSMON_CFG_MON_SEL. As MSMON_CFG_MON_SEL is a 32 bit register update the type of mon_sel to u32. Write mon_sel to the intended register, MSMON_CFG_MON_SEL. Fixes: 8c90dc68a5de ("arm_mpam: Probe the hardware features resctrl supports") Cc: <stable@vger.kernel.org> Signed-off-by: Ben Horgan <ben.horgan@arm.com> Reviewed-by: James Morse <james.morse@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 
In _mpam_ris_hw_probe_hw_nrdy() a new register value to select the first
monitor and relevant RIS is prepared in mon_sel. However, it is written to
the monitor value register, e.g. MSMON_CSU, rather than MSMON_CFG_MON_SEL.

As MSMON_CFG_MON_SEL is a 32 bit register update the type of mon_sel to
u32.  Write mon_sel to the intended register, MSMON_CFG_MON_SEL.

Fixes: 8c90dc68a5de ("arm_mpam: Probe the hardware features resctrl supports")
Cc: <stable@vger.kernel.org>
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux 2026-04-20T23:46:22+00:00 Linus Torvalds torvalds@linux-foundation.org 2026-04-20T23:46:22+00:00 13f24586a292e35c9cc71e649dc4e4ea1895c5e5 Pull more arm64 updates from Catalin Marinas: "The main 'feature' is a workaround for C1-Pro erratum 4193714 requiring IPIs during TLB maintenance if a process is running in user space with SME enabled. The hardware acknowledges the DVMSync messages before completing in-flight SME accesses, with security implications. The workaround makes use of the mm_cpumask() to track the cores that need interrupting (arm64 hasn't used this mask before). The rest are fixes for MPAM, CCA and generated header that turned up during the merging window or shortly before. Summary: Core features: - Add workaround for C1-Pro erratum 4193714 - early CME (SME unit) DVMSync acknowledgement. The fix consists of sending IPIs on TLB maintenance to those CPUs running in user space with SME enabled - Include kernel-hwcap.h in list of generated files (missed in a recent commit generating the KERNEL_HWCAP_* macros) CCA: - Fix RSI_INCOMPLETE error check in arm-cca-guest MPAM: - Fix an unmount->remount problem with the CDP emulation, uninitialised variable and checker warnings" * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: arm_mpam: resctrl: Make resctrl_mon_ctx_waiters static arm_mpam: resctrl: Fix the check for no monitor components found arm_mpam: resctrl: Fix MBA CDP alloc_capable handling on unmount virt: arm-cca-guest: fix error check for RSI_INCOMPLETE arm64/hwcap: Include kernel-hwcap.h in list of generated files arm64: errata: Work around early CME DVMSync acknowledgement arm64: cputype: Add C1-Pro definitions arm64: tlb: Pass the corresponding mm to __tlbi_sync_s1ish() arm64: tlb: Introduce __tlbi_sync_s1ish_{kernel,batch}() for TLB maintenance 
Pull more arm64 updates from Catalin Marinas:
 "The main 'feature' is a workaround for C1-Pro erratum 4193714
  requiring IPIs during TLB maintenance if a process is running in user
  space with SME enabled.

  The hardware acknowledges the DVMSync messages before completing
  in-flight SME accesses, with security implications. The workaround
  makes use of the mm_cpumask() to track the cores that need
  interrupting (arm64 hasn't used this mask before).

  The rest are fixes for MPAM, CCA and generated header that turned up
  during the merging window or shortly before.

  Summary:

  Core features:

   - Add workaround for C1-Pro erratum 4193714 - early CME (SME unit)
     DVMSync acknowledgement. The fix consists of sending IPIs on TLB
     maintenance to those CPUs running in user space with SME enabled

   - Include kernel-hwcap.h in list of generated files (missed in a
     recent commit generating the KERNEL_HWCAP_* macros)

  CCA:

   - Fix RSI_INCOMPLETE error check in arm-cca-guest

  MPAM:

   - Fix an unmount->remount problem with the CDP emulation,
     uninitialised variable and checker warnings"

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm_mpam: resctrl: Make resctrl_mon_ctx_waiters static
  arm_mpam: resctrl: Fix the check for no monitor components found
  arm_mpam: resctrl: Fix MBA CDP alloc_capable handling on unmount
  virt: arm-cca-guest: fix error check for RSI_INCOMPLETE
  arm64/hwcap: Include kernel-hwcap.h in list of generated files
  arm64: errata: Work around early CME DVMSync acknowledgement
  arm64: cputype: Add C1-Pro definitions
  arm64: tlb: Pass the corresponding mm to __tlbi_sync_s1ish()
  arm64: tlb: Introduce __tlbi_sync_s1ish_{kernel,batch}() for TLB maintenance
arm_mpam: resctrl: Make resctrl_mon_ctx_waiters static 2026-04-17T16:48:07+00:00 Ben Horgan ben.horgan@arm.com 2026-04-14T13:27:58+00:00 4d5bbbafc170eb21474a37d844211fce6b0f3c51 resctrl_mon_ctx_waiters is not used outside of this file, so make it static. This fixes the sparse warning: drivers/resctrl/mpam_resctrl.c:25:1: warning: symbol 'resctrl_mon_ctx_waiters' was not declared. Should it be static? Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202603281842.c2K96tJA-lkp@intel.com/ Fixes: 2a3c79c61539 ("arm_mpam: resctrl: Allow resctrl to allocate monitors") Signed-off-by: Ben Horgan <ben.horgan@arm.com> Reviewed-by: Gavin Shan <gshan@redhat.com> Signed-off-by: James Morse <james.morse@arm.com> 
resctrl_mon_ctx_waiters is not used outside of this file, so make it
static. This fixes the sparse warning:

drivers/resctrl/mpam_resctrl.c:25:1: warning: symbol 'resctrl_mon_ctx_waiters' was not declared. Should it be static?

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202603281842.c2K96tJA-lkp@intel.com/
Fixes: 2a3c79c61539 ("arm_mpam: resctrl: Allow resctrl to allocate monitors")
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Signed-off-by: James Morse <james.morse@arm.com>
arm_mpam: resctrl: Fix the check for no monitor components found 2026-04-17T16:48:07+00:00 Ben Horgan ben.horgan@arm.com 2026-04-14T13:27:56+00:00 67c0a487efa542cca9477ea84915db2e091f98d0 Dan Carpenter reports that, in mpam_resctrl_alloc_domain(), any_mon_comp is used in an 'if' condition when it may be uninitialized. Initialize it to NULL so that the check behaves correctly when no monitor components are found. Reported-by: Dan Carpenter <error27@gmail.com> Fixes: 264c285999fc ("arm_mpam: resctrl: Add monitor initialisation and domain boilerplate") Signed-off-by: Ben Horgan <ben.horgan@arm.com> Reviewed-by: Gavin Shan <gshan@redhat.com> Signed-off-by: James Morse <james.morse@arm.com> 
Dan Carpenter reports that, in mpam_resctrl_alloc_domain(), any_mon_comp is
used in an 'if' condition when it may be uninitialized. Initialize it to
NULL so that the check behaves correctly when no monitor components are
found.

Reported-by: Dan Carpenter <error27@gmail.com>
Fixes: 264c285999fc ("arm_mpam: resctrl: Add monitor initialisation and domain boilerplate")
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Signed-off-by: James Morse <james.morse@arm.com>
arm_mpam: resctrl: Fix MBA CDP alloc_capable handling on unmount 2026-04-17T16:43:57+00:00 Zeng Heng zengheng4@huawei.com 2026-04-13T09:00:41+00:00 f758340da529ccb12531c3f83d5992e912f6c8d5 The code to set MBA's alloc_capable to true appears to be trying to restore alloc_capable on unmount. This can never work because resctrl_arch_set_cdp_enabled() is never invoked with RDT_RESOURCE_MBA as the rid parameter. Consequently, mpam_resctrl_controls[RDT_RESOURCE_MBA].cdp_enabled always remains false. The alloc_capable setting in resctrl_arch_set_cdp_enabled() is to re-enable MBA if the caller opts in to separate control values using CDP for this resource. This doesn't happen today. Add a comment to describe this. However a bug remains where MBA allocation is permanently disabled after the mount with CDP option. Remounting without CDP cannot restore the MBA partition capability. Add a check to re-enable MBA when CDP is disabled, which happens on unmount. Fixes: 6789fb99282c ("arm_mpam: resctrl: Add CDP emulation") Signed-off-by: Zeng Heng <zengheng4@huawei.com> [ morse: Added comment for existing code, added hunk to fix this bug from Ben H ] Reviewed-by: James Morse <james.morse@arm.com> Signed-off-by: James Morse <james.morse@arm.com> 
The code to set MBA's alloc_capable to true appears to be trying to
restore alloc_capable on unmount. This can never work because
resctrl_arch_set_cdp_enabled() is never invoked with RDT_RESOURCE_MBA
as the rid parameter. Consequently,
mpam_resctrl_controls[RDT_RESOURCE_MBA].cdp_enabled always remains false.

The alloc_capable setting in resctrl_arch_set_cdp_enabled() is to
re-enable MBA if the caller opts in to separate control values using
CDP for this resource. This doesn't happen today.

Add a comment to describe this.

However a bug remains where MBA allocation is permanently disabled after
the mount with CDP option. Remounting without CDP cannot restore the MBA
partition capability.

Add a check to re-enable MBA when CDP is disabled, which happens on
unmount.

Fixes: 6789fb99282c ("arm_mpam: resctrl: Add CDP emulation")
Signed-off-by: Zeng Heng <zengheng4@huawei.com>
[ morse: Added comment for existing code, added hunk to fix this bug from
  Ben H ]
Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux 2026-04-14T23:48:56+00:00 Linus Torvalds torvalds@linux-foundation.org 2026-04-14T23:48:56+00:00 c43267e6794a36013fd495a4d81bf7f748fe4615 Pull arm64 updates from Catalin Marinas: "The biggest changes are MPAM enablement in drivers/resctrl and new PMU support under drivers/perf. On the core side, FEAT_LSUI lets futex atomic operations with EL0 permissions, avoiding PAN toggling. The rest is mostly TLB invalidation refactoring, further generic entry work, sysreg updates and a few fixes. Core features: - Add support for FEAT_LSUI, allowing futex atomic operations without toggling Privileged Access Never (PAN) - Further refactor the arm64 exception handling code towards the generic entry infrastructure - Optimise __READ_ONCE() with CONFIG_LTO=y and allow alias analysis through it Memory management: - Refactor the arm64 TLB invalidation API and implementation for better control over barrier placement and level-hinted invalidation - Enable batched TLB flushes during memory hot-unplug - Fix rodata=full block mapping support for realm guests (when BBML2_NOABORT is available) Perf and PMU: - Add support for a whole bunch of system PMUs featured in NVIDIA's Tegra410 SoC (cspmu extensions for the fabric and PCIe, new drivers for CPU/C2C memory latency PMUs) - Clean up iomem resource handling in the Arm CMN driver - Fix signedness handling of AA64DFR0.{PMUVer,PerfMon} MPAM (Memory Partitioning And Monitoring): - Add architecture context-switch and hiding of the feature from KVM - Add interface to allow MPAM to be exposed to user-space using resctrl - Add errata workaround for some existing platforms - Add documentation for using MPAM and what shape of platforms can use resctrl Miscellaneous: - Check DAIF (and PMR, where relevant) at task-switch time - Skip TFSR_EL1 checks and barriers in synchronous MTE tag check mode (only relevant to asynchronous or asymmetric tag check modes) - Remove a duplicate allocation in the kexec code - Remove redundant save/restore of SCS SP on entry to/from EL0 - Generate the KERNEL_HWCAP_ definitions from the arm64 hwcap descriptions - Add kselftest coverage for cmpbr_sigill() - Update sysreg definitions" * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (109 commits) arm64: rsi: use linear-map alias for realm config buffer arm64: Kconfig: fix duplicate word in CMDLINE help text arm64: mte: Skip TFSR_EL1 checks and barriers in synchronous tag check mode arm64/sysreg: Update ID_AA64SMFR0_EL1 description to DDI0601 2025-12 arm64/sysreg: Update ID_AA64ZFR0_EL1 description to DDI0601 2025-12 arm64/sysreg: Update ID_AA64FPFR0_EL1 description to DDI0601 2025-12 arm64/sysreg: Update ID_AA64ISAR2_EL1 description to DDI0601 2025-12 arm64/sysreg: Update ID_AA64ISAR0_EL1 description to DDI0601 2025-12 arm64/hwcap: Generate the KERNEL_HWCAP_ definitions for the hwcaps arm64: kexec: Remove duplicate allocation for trans_pgd ACPI: AGDI: fix missing newline in error message arm64: Check DAIF (and PMR) at task-switch time arm64: entry: Use split preemption logic arm64: entry: Use irqentry_{enter_from,exit_to}_kernel_mode() arm64: entry: Consistently prefix arm64-specific wrappers arm64: entry: Don't preempt with SError or Debug masked entry: Split preemption from irqentry_exit_to_kernel_mode() entry: Split kernel mode logic from irqentry_{enter,exit}() entry: Move irqentry_enter() prototype later entry: Remove local_irq_{enable,disable}_exit_to_user() ... 
Pull arm64 updates from Catalin Marinas:
 "The biggest changes are MPAM enablement in drivers/resctrl and new PMU
  support under drivers/perf.

  On the core side, FEAT_LSUI lets futex atomic operations with EL0
  permissions, avoiding PAN toggling.

  The rest is mostly TLB invalidation refactoring, further generic entry
  work, sysreg updates and a few fixes.

  Core features:

   - Add support for FEAT_LSUI, allowing futex atomic operations without
     toggling Privileged Access Never (PAN)

   - Further refactor the arm64 exception handling code towards the
     generic entry infrastructure

   - Optimise __READ_ONCE() with CONFIG_LTO=y and allow alias analysis
     through it

  Memory management:

   - Refactor the arm64 TLB invalidation API and implementation for
     better control over barrier placement and level-hinted invalidation

   - Enable batched TLB flushes during memory hot-unplug

   - Fix rodata=full block mapping support for realm guests (when
     BBML2_NOABORT is available)

  Perf and PMU:

   - Add support for a whole bunch of system PMUs featured in NVIDIA's
     Tegra410 SoC (cspmu extensions for the fabric and PCIe, new drivers
     for CPU/C2C memory latency PMUs)

   - Clean up iomem resource handling in the Arm CMN driver

   - Fix signedness handling of AA64DFR0.{PMUVer,PerfMon}

  MPAM (Memory Partitioning And Monitoring):

   - Add architecture context-switch and hiding of the feature from KVM

   - Add interface to allow MPAM to be exposed to user-space using
     resctrl

   - Add errata workaround for some existing platforms

   - Add documentation for using MPAM and what shape of platforms can
     use resctrl

  Miscellaneous:

   - Check DAIF (and PMR, where relevant) at task-switch time

   - Skip TFSR_EL1 checks and barriers in synchronous MTE tag check mode
     (only relevant to asynchronous or asymmetric tag check modes)

   - Remove a duplicate allocation in the kexec code

   - Remove redundant save/restore of SCS SP on entry to/from EL0

   - Generate the KERNEL_HWCAP_ definitions from the arm64 hwcap
     descriptions

   - Add kselftest coverage for cmpbr_sigill()

   - Update sysreg definitions"

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (109 commits)
  arm64: rsi: use linear-map alias for realm config buffer
  arm64: Kconfig: fix duplicate word in CMDLINE help text
  arm64: mte: Skip TFSR_EL1 checks and barriers in synchronous tag check mode
  arm64/sysreg: Update ID_AA64SMFR0_EL1 description to DDI0601 2025-12
  arm64/sysreg: Update ID_AA64ZFR0_EL1 description to DDI0601 2025-12
  arm64/sysreg: Update ID_AA64FPFR0_EL1 description to DDI0601 2025-12
  arm64/sysreg: Update ID_AA64ISAR2_EL1 description to DDI0601 2025-12
  arm64/sysreg: Update ID_AA64ISAR0_EL1 description to DDI0601 2025-12
  arm64/hwcap: Generate the KERNEL_HWCAP_ definitions for the hwcaps
  arm64: kexec: Remove duplicate allocation for trans_pgd
  ACPI: AGDI: fix missing newline in error message
  arm64: Check DAIF (and PMR) at task-switch time
  arm64: entry: Use split preemption logic
  arm64: entry: Use irqentry_{enter_from,exit_to}_kernel_mode()
  arm64: entry: Consistently prefix arm64-specific wrappers
  arm64: entry: Don't preempt with SError or Debug masked
  entry: Split preemption from irqentry_exit_to_kernel_mode()
  entry: Split kernel mode logic from irqentry_{enter,exit}()
  entry: Move irqentry_enter() prototype later
  entry: Remove local_irq_{enable,disable}_exit_to_user()
  ...