Re: [PATCH v2 10/45] arm64: mpam: Add cpu_pm notifier to restore MPAM sysregs

[PATCH v2 00/45] arm_mpam: Add KVM/arm64 and resctrl glue code · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
[PATCH v2 01/45] arm_mpam: Stop using uninitialized variables in __ris_msmon_read() · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 01/45] arm_mpam: Stop using uninitialized variables in __ris_msmon_read() · Jonathan Cameron <jonathan.cameron@huawei.com> · 2025-12-23
[PATCH v2 02/45] arm_mpam: Remove duplicate linux/srcu.h header · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 02/45] arm_mpam: Remove duplicate linux/srcu.h header · Jonathan Cameron <jonathan.cameron@huawei.com> · 2025-12-23
[PATCH v2 03/45] arm_mpam: Use non-atomic bitops when modifying feature bitmap · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 03/45] arm_mpam: Use non-atomic bitops when modifying feature bitmap · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-05
Re: [PATCH v2 03/45] arm_mpam: Use non-atomic bitops when modifying feature bitmap · Ben Horgan <ben.horgan@arm.com> · 2026-01-06
[PATCH v2 04/45] arm64/sysreg: Add MPAMSM_EL1 register · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 04/45] arm64/sysreg: Add MPAMSM_EL1 register · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-05
[PATCH v2 05/45] KVM: arm64: Preserve host MPAM configuration when changing traps · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 05/45] KVM: arm64: Preserve host MPAM configuration when changing traps · Oliver Upton <oupton@kernel.org> · 2025-12-19
Re: [PATCH v2 05/45] KVM: arm64: Preserve host MPAM configuration when changing traps · Ben Horgan <ben.horgan@arm.com> · 2026-01-02
Re: [PATCH v2 05/45] KVM: arm64: Preserve host MPAM configuration when changing traps · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-05
[PATCH v2 06/45] KVM: arm64: Make MPAMSM_EL1 accesses UNDEF · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 06/45] KVM: arm64: Make MPAMSM_EL1 accesses UNDEF · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-05
Re: [PATCH v2 06/45] KVM: arm64: Make MPAMSM_EL1 accesses UNDEF · Ben Horgan <ben.horgan@arm.com> · 2026-01-05
[PATCH v2 07/45] arm64: mpam: Context switch the MPAM registers · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 07/45] arm64: mpam: Context switch the MPAM registers · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-05
Re: [PATCH v2 07/45] arm64: mpam: Context switch the MPAM registers · Ben Horgan <ben.horgan@arm.com> · 2026-01-06
Re: [PATCH v2 07/45] arm64: mpam: Context switch the MPAM registers · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
Re: [PATCH v2 07/45] arm64: mpam: Context switch the MPAM registers · Shaopeng Tan (Fujitsu) <hidden> · 2026-01-08
Re: [PATCH v2 07/45] arm64: mpam: Context switch the MPAM registers · Ben Horgan <ben.horgan@arm.com> · 2026-01-09
[PATCH v2 08/45] arm64: mpam: Re-initialise MPAM regs when CPU comes online · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 08/45] arm64: mpam: Re-initialise MPAM regs when CPU comes online · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-05
[PATCH v2 09/45] arm64: mpam: Advertise the CPUs MPAM limits to the driver · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 09/45] arm64: mpam: Advertise the CPUs MPAM limits to the driver · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-05
[PATCH v2 10/45] arm64: mpam: Add cpu_pm notifier to restore MPAM sysregs · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 10/45] arm64: mpam: Add cpu_pm notifier to restore MPAM sysregs · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-05
[PATCH v2 11/45] arm64: mpam: Initialise and context switch the MPAMSM_EL1 register · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 11/45] arm64: mpam: Initialise and context switch the MPAMSM_EL1 register · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-05
[PATCH v2 12/45] arm64: mpam: Add helpers to change a task or cpu's MPAM PARTID/PMG values · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 12/45] arm64: mpam: Add helpers to change a task or cpu's MPAM PARTID/PMG values · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-05
Re: [PATCH v2 12/45] arm64: mpam: Add helpers to change a task or cpu's MPAM PARTID/PMG values · Shaopeng Tan (Fujitsu) <hidden> · 2026-01-08
Re: [PATCH v2 12/45] arm64: mpam: Add helpers to change a task or cpu's MPAM PARTID/PMG values · Ben Horgan <ben.horgan@arm.com> · 2026-01-09
[PATCH v2 13/45] KVM: arm64: Force guest EL1 to use user-space's partid configuration · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 13/45] KVM: arm64: Force guest EL1 to use user-space's partid configuration · Oliver Upton <oupton@kernel.org> · 2025-12-19
Re: [PATCH v2 13/45] KVM: arm64: Force guest EL1 to use user-space's partid configuration · Ben Horgan <ben.horgan@arm.com> · 2026-01-02
[PATCH v2 14/45] KVM: arm64: Use kernel-space partid configuration for hypercalls · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
[PATCH v2 15/45] arm_mpam: resctrl: Add boilerplate cpuhp and domain allocation · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 15/45] arm_mpam: resctrl: Add boilerplate cpuhp and domain allocation · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-05
Re: [PATCH v2 15/45] arm_mpam: resctrl: Add boilerplate cpuhp and domain allocation · Ben Horgan <ben.horgan@arm.com> · 2026-01-06
Re: [PATCH v2 15/45] arm_mpam: resctrl: Add boilerplate cpuhp and domain allocation · Shaopeng Tan (Fujitsu) <hidden> · 2026-01-08
Re: [PATCH v2 15/45] arm_mpam: resctrl: Add boilerplate cpuhp and domain allocation · Ben Horgan <ben.horgan@arm.com> · 2026-01-09
[PATCH v2 16/45] arm_mpam: resctrl: Sort the order of the domain lists · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 16/45] arm_mpam: resctrl: Sort the order of the domain lists · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-05
[PATCH v2 17/45] arm_mpam: resctrl: Pick the caches we will use as resctrl resources · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 17/45] arm_mpam: resctrl: Pick the caches we will use as resctrl resources · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-05
[PATCH v2 18/45] arm_mpam: resctrl: Implement resctrl_arch_reset_all_ctrls() · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 18/45] arm_mpam: resctrl: Implement resctrl_arch_reset_all_ctrls() · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-05
Re: [PATCH v2 18/45] arm_mpam: resctrl: Implement resctrl_arch_reset_all_ctrls() · Ben Horgan <ben.horgan@arm.com> · 2026-01-06
Re: [PATCH v2 18/45] arm_mpam: resctrl: Implement resctrl_arch_reset_all_ctrls() · Zeng Heng <hidden> · 2026-01-09
Re: [PATCH v2 18/45] arm_mpam: resctrl: Implement resctrl_arch_reset_all_ctrls() · Ben Horgan <ben.horgan@arm.com> · 2026-01-13
[PATCH v2 19/45] arm_mpam: resctrl: Add resctrl_arch_get_config() · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 19/45] arm_mpam: resctrl: Add resctrl_arch_get_config() · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-05
[PATCH v2 20/45] arm_mpam: resctrl: Implement helpers to update configuration · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 20/45] arm_mpam: resctrl: Implement helpers to update configuration · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-05
[PATCH v2 21/45] arm_mpam: resctrl: Add plumbing against arm64 task and cpu hooks · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 21/45] arm_mpam: resctrl: Add plumbing against arm64 task and cpu hooks · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-05
[PATCH v2 22/45] arm_mpam: resctrl: Add CDP emulation · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 22/45] arm_mpam: resctrl: Add CDP emulation · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-05
Re: [PATCH v2 22/45] arm_mpam: resctrl: Add CDP emulation · Ben Horgan <ben.horgan@arm.com> · 2026-01-06
[PATCH v2 23/45] arm_mpam: resctrl: Add rmid index helpers · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 23/45] arm_mpam: resctrl: Add rmid index helpers · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
Re: [PATCH v2 23/45] arm_mpam: resctrl: Add rmid index helpers · Ben Horgan <ben.horgan@arm.com> · 2026-01-06
Re: [PATCH v2 23/45] arm_mpam: resctrl: Add rmid index helpers · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
Re: [PATCH v2 23/45] arm_mpam: resctrl: Add rmid index helpers · Ben Horgan <ben.horgan@arm.com> · 2026-01-06
[PATCH v2 24/45] arm_mpam: resctrl: Convert to/from MPAMs fixed-point formats · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 24/45] arm_mpam: resctrl: Convert to/from MPAMs fixed-point formats · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
[PATCH v2 25/45] arm_mpam: resctrl: Add support for 'MB' resource · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 0/45] arm_mpam: Add KVM/arm64 and resctrl glue code · Zeng Heng <hidden> · 2025-12-27
Re: [PATCH v2 25/45] arm_mpam: resctrl: Add support for 'MB' resource · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
Re: [PATCH v2 25/45] arm_mpam: resctrl: Add support for 'MB' resource · Ben Horgan <ben.horgan@arm.com> · 2026-01-07
Re: [PATCH v2 25/45] arm_mpam: resctrl: Add support for 'MB' resource · Shaopeng Tan (Fujitsu) <hidden> · 2026-01-08
Re: [PATCH v2 25/45] arm_mpam: resctrl: Add support for 'MB' resource · Ben Horgan <ben.horgan@arm.com> · 2026-01-12
[PATCH v2 26/45] arm_mpam: resctrl: Add kunit test for control format conversions · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 26/45] arm_mpam: resctrl: Add kunit test for control format conversions · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
[PATCH v2 27/45] arm_mpam: resctrl: Add support for csu counters · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 27/45] arm_mpam: resctrl: Add support for csu counters · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
Re: [PATCH v2 27/45] arm_mpam: resctrl: Add support for csu counters · Shaopeng Tan (Fujitsu) <hidden> · 2026-01-08
Re: [PATCH v2 27/45] arm_mpam: resctrl: Add support for csu counters · Ben Horgan <ben.horgan@arm.com> · 2026-01-08
[PATCH v2 28/45] arm_mpam: resctrl: Pick classes for use as mbm counters · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 28/45] arm_mpam: resctrl: Pick classes for use as mbm counters · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
Re: [PATCH v2 28/45] arm_mpam: resctrl: Pick classes for use as mbm counters · Ben Horgan <ben.horgan@arm.com> · 2026-01-07
[PATCH v2 29/45] arm_mpam: resctrl: Pre-allocate free running monitors · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 29/45] arm_mpam: resctrl: Pre-allocate free running monitors · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
Re: [PATCH v2 29/45] arm_mpam: resctrl: Pre-allocate free running monitors · Ben Horgan <ben.horgan@arm.com> · 2026-01-08
[PATCH v2 30/45] arm_mpam: resctrl: Pre-allocate assignable monitors · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 30/45] arm_mpam: resctrl: Pre-allocate assignable monitors · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
Re: [PATCH v2 30/45] arm_mpam: resctrl: Pre-allocate assignable monitors · Ben Horgan <ben.horgan@arm.com> · 2026-01-08
[PATCH v2 31/45] arm_mpam: resctrl: Add kunit test for ABMC/CDP interactions · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
[PATCH v2 32/45] arm_mpam: resctrl: Add resctrl_arch_config_cntr() for ABMC use · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 32/45] arm_mpam: resctrl: Add resctrl_arch_config_cntr() for ABMC use · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
[PATCH v2 33/45] arm_mpam: resctrl: Allow resctrl to allocate monitors · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 33/45] arm_mpam: resctrl: Allow resctrl to allocate monitors · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
[PATCH v2 34/45] arm_mpam: resctrl: Add resctrl_arch_rmid_read() and resctrl_arch_reset_rmid() · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 34/45] arm_mpam: resctrl: Add resctrl_arch_rmid_read() and resctrl_arch_reset_rmid() · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
[PATCH v2 35/45] arm_mpam: resctrl: Add resctrl_arch_cntr_read() & resctrl_arch_reset_cntr() · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 35/45] arm_mpam: resctrl: Add resctrl_arch_cntr_read() & resctrl_arch_reset_cntr() · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
[PATCH v2 36/45] arm_mpam: resctrl: Update the rmid reallocation limit · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 36/45] arm_mpam: resctrl: Update the rmid reallocation limit · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
[PATCH v2 37/45] arm_mpam: resctrl: Add empty definitions for assorted resctrl functions · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 37/45] arm_mpam: resctrl: Add empty definitions for assorted resctrl functions · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
[PATCH v2 38/45] arm64: mpam: Select ARCH_HAS_CPU_RESCTRL · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 38/45] arm64: mpam: Select ARCH_HAS_CPU_RESCTRL · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
[PATCH v2 39/45] arm_mpam: resctrl: Call resctrl_init() on platforms that can support resctrl · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 39/45] arm_mpam: resctrl: Call resctrl_init() on platforms that can support resctrl · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
Re: [PATCH v2 39/45] arm_mpam: resctrl: Call resctrl_init() on platforms that can support resctrl · Ben Horgan <ben.horgan@arm.com> · 2026-01-08
[PATCH v2 40/45] arm_mpam: Generate a configuration for min controls · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 40/45] arm_mpam: Generate a configuration for min controls · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
Re: [PATCH v2 40/45] arm_mpam: Generate a configuration for min controls · Ben Horgan <ben.horgan@arm.com> · 2026-01-08
[PATCH v2 41/45] arm_mpam: Add quirk framework · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 41/45] arm_mpam: Add quirk framework · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
Re: [PATCH v2 41/45] arm_mpam: Add quirk framework · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
[PATCH v2 42/45] arm_mpam: Add workaround for T241-MPAM-1 · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
[PATCH v2 43/45] arm_mpam: Add workaround for T241-MPAM-4 · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: [PATCH v2 43/45] arm_mpam: Add workaround for T241-MPAM-4 · Jonathan Cameron <jonathan.cameron@huawei.com> · 2026-01-06
[PATCH v2 44/45] arm_mpam: Add workaround for T241-MPAM-6 · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
[PATCH v2 45/45] arm_mpam: Quirk CMN-650's CSU NRDY behaviour · Ben Horgan <ben.horgan@arm.com> · 2025-12-19
Re: (subset) [PATCH v2 00/45] arm_mpam: Add KVM/arm64 and resctrl glue code · Catalin Marinas <catalin.marinas@arm.com> · 2026-01-08

From: Jonathan Cameron <jonathan.cameron@huawei.com>
Date: 2026-01-05 17:10:06
Also in: kvmarm, lkml

On Fri, 19 Dec 2025 18:11:12 +0000
Ben Horgan [off-list ref] wrote:

From: James Morse <james.morse@arm.com>

The MPAM system registers will be lost if the CPU is reset during PSCI's
CPU_SUSPEND.

Add a PM notifier to restore them.

mpam_thread_switch(current) can't be used as this won't make any changes if
the in-memory copy says the register already has the correct value. In
reality the system register is UNKNOWN out of reset.

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Ben Horgan <ben.horgan@arm.com>

Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>

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