[GIT PULL] arm_mpam: Add KVM/arm64 and resctrl glue code

[GIT PULL] arm_mpam: Add KVM/arm64 and resctrl glue code

[James Morse]

Hi Catalin, Will,

Below is the MPAM series that plumbs all this stuff out to user-space via resctrl.

3 patches against KVM Acked by Marc Z, 9 patches against arm64 Acked or Reviewed by
Catalin. One patch "arm_mpam: resctrl: Add CDP emulation" adds an include to the
asm/mpam.h header. I'm assuming that doesn't need an ack.

Thanks to Ben for fixing all my bugs!

James

----------------------------------------------------------------
The following changes since commit 1f318b96cc84d7c2ab792fcc0bfd42a7ca890681:

  Linux 7.0-rc3 (2026-03-08 16:56:54 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git mpam/glue/v7.0-rc3

for you to fetch changes up to 4ce0a2ccc0358f3f746fa50815a599f861fd5d68:

  arm64: mpam: Add initial MPAM documentation (2026-03-27 15:32:52 +0000)

----------------------------------------------------------------
Expose MPAM to user-space via resctrl based on v7.0-rc3

 - 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 workaoround for some existing platforms.
 - Add documentation for using MPAM and what shape of platforms can use resctrl

----------------------------------------------------------------
Ben Horgan (11):
      arm_mpam: Reset when feature configuration bit unset
      arm64/sysreg: Add MPAMSM_EL1 register
      KVM: arm64: Preserve host MPAM configuration when changing traps
      KVM: arm64: Make MPAMSM_EL1 accesses UNDEF
      arm64: mpam: Drop the CONFIG_EXPERT restriction
      arm64: mpam: Initialise and context switch the MPAMSM_EL1 register
      arm_mpam: resctrl: Hide CDP emulation behind CONFIG_EXPERT
      arm_mpam: resctrl: Add rmid index helpers
      arm_mpam: resctrl: Wait for cacheinfo to be ready
      arm_mpam: resctrl: Add monitor initialisation and domain boilerplate
      arm64: mpam: Add initial MPAM documentation

Dave Martin (2):
      arm_mpam: resctrl: Convert to/from MPAMs fixed-point formats
      arm_mpam: resctrl: Add kunit test for control format conversions

James Morse (22):
      arm64: mpam: Context switch the MPAM registers
      arm64: mpam: Re-initialise MPAM regs when CPU comes online
      arm64: mpam: Advertise the CPUs MPAM limits to the driver
      arm64: mpam: Add cpu_pm notifier to restore MPAM sysregs
      arm64: mpam: Add helpers to change a task or cpu's MPAM PARTID/PMG values
      KVM: arm64: Force guest EL1 to use user-space's partid configuration
      arm_mpam: resctrl: Add boilerplate cpuhp and domain allocation
      arm_mpam: resctrl: Pick the caches we will use as resctrl resources
      arm_mpam: resctrl: Implement resctrl_arch_reset_all_ctrls()
      arm_mpam: resctrl: Add resctrl_arch_get_config()
      arm_mpam: resctrl: Implement helpers to update configuration
      arm_mpam: resctrl: Add plumbing against arm64 task and cpu hooks
      arm_mpam: resctrl: Add CDP emulation
      arm_mpam: resctrl: Add support for 'MB' resource
      arm_mpam: resctrl: Add support for csu counters
      arm_mpam: resctrl: Allow resctrl to allocate monitors
      arm_mpam: resctrl: Add resctrl_arch_rmid_read()
      arm_mpam: resctrl: Update the rmid reallocation limit
      arm_mpam: resctrl: Add empty definitions for assorted resctrl functions
      arm64: mpam: Select ARCH_HAS_CPU_RESCTRL
      arm_mpam: resctrl: Call resctrl_init() on platforms that can support resctrl
      arm_mpam: Quirk CMN-650's CSU NRDY behaviour

Shanker Donthineni (4):
      arm_mpam: Add quirk framework
      arm_mpam: Add workaround for T241-MPAM-1
      arm_mpam: Add workaround for T241-MPAM-4
      arm_mpam: Add workaround for T241-MPAM-6

Zeng Heng (1):
      arm_mpam: Ensure in_reset_state is false after applying configuration

 Documentation/arch/arm64/index.rst          |    1 +
 Documentation/arch/arm64/mpam.rst           |   72 ++
 Documentation/arch/arm64/silicon-errata.rst |    9 +
 arch/arm64/Kconfig                          |    6 +-
 arch/arm64/include/asm/el2_setup.h          |    3 +-
 arch/arm64/include/asm/mpam.h               |   96 ++
 arch/arm64/include/asm/resctrl.h            |    2 +
 arch/arm64/include/asm/thread_info.h        |    3 +
 arch/arm64/kernel/Makefile                  |    1 +
 arch/arm64/kernel/cpufeature.c              |   21 +-
 arch/arm64/kernel/mpam.c                    |   62 +
 arch/arm64/kernel/process.c                 |    7 +
 arch/arm64/kvm/hyp/include/hyp/switch.h     |   12 +-
 arch/arm64/kvm/hyp/vhe/sysreg-sr.c          |   16 +
 arch/arm64/kvm/sys_regs.c                   |    2 +
 arch/arm64/tools/sysreg                     |    8 +
 drivers/resctrl/Kconfig                     |    9 +-
 drivers/resctrl/Makefile                    |    1 +
 drivers/resctrl/mpam_devices.c              |  305 ++++-
 drivers/resctrl/mpam_internal.h             |  108 +-
 drivers/resctrl/mpam_resctrl.c              | 1704 +++++++++++++++++++++++++++
 drivers/resctrl/test_mpam_resctrl.c         |  315 +++++
 include/linux/arm_mpam.h                    |   32 +
 23 files changed, 2735 insertions(+), 60 deletions(-)
 create mode 100644 Documentation/arch/arm64/mpam.rst
 create mode 100644 arch/arm64/include/asm/mpam.h
 create mode 100644 arch/arm64/include/asm/resctrl.h
 create mode 100644 arch/arm64/kernel/mpam.c
 create mode 100644 drivers/resctrl/mpam_resctrl.c
 create mode 100644 drivers/resctrl/test_mpam_resctrl.c

Re: [GIT PULL] arm_mpam: Add KVM/arm64 and resctrl glue code

[Catalin Marinas]

On Fri, Mar 27, 2026 at 04:19:26PM +0000, James Morse wrote:
> The following changes since commit 1f318b96cc84d7c2ab792fcc0bfd42a7ca890681:
> 
>   Linux 7.0-rc3 (2026-03-08 16:56:54 -0700)
> 
> are available in the Git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git mpam/glue/v7.0-rc3
> 
> for you to fetch changes up to 4ce0a2ccc0358f3f746fa50815a599f861fd5d68:
> 
>   arm64: mpam: Add initial MPAM documentation (2026-03-27 15:32:52 +0000)

Pulled into arm64 for-next/mpam. Thanks.

-- 
Catalin