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From: Will Deacon <will@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
	Will Deacon <will@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Marc Zyngier <maz@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Morten Rasmussen <morten.rasmussen@arm.com>,
	Qais Yousef <qais.yousef@arm.com>,
	Suren Baghdasaryan <surenb@google.com>,
	Quentin Perret <qperret@google.com>, Tejun Heo <tj@kernel.org>,
	Li Zefan <lizefan@huawei.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Ingo Molnar <mingo@redhat.com>,
	Juri Lelli <juri.lelli@redhat.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	kernel-team@android.com
Subject: [PATCH v4 00/14] An alternative series for asymmetric AArch32 systems
Date: Tue, 24 Nov 2020 15:50:25 +0000	[thread overview]
Message-ID: <20201124155039.13804-1-will@kernel.org> (raw)

Hello folks,

Here's version four of the wonderful patches I previously posted here:

  v1: https://lore.kernel.org/r/20201027215118.27003-1-will@kernel.org
  v2: https://lore.kernel.org/r/20201109213023.15092-1-will@kernel.org
  v3: https://lore.kernel.org/r/20201113093720.21106-1-will@kernel.org

and which started life as a reimplementation of some patches from Qais:

  https://lore.kernel.org/r/20201021104611.2744565-1-qais.yousef@arm.com

The aim of this series is to allow 32-bit ARM applications to run on
arm64 SoCs where not all of the CPUs support the 32-bit instruction set.
Unfortunately, such SoCs are real and will continue to be productised
over the next few years at least.

Changes in v4 include:

  * Take into account the cpuset 'allowed' mask on exec
  * Print a warning if we forcefully override the affinity, like we do
    in select_fallback_rq()
  * Rename arch_cpu_allowed_mask() to arch_task_cpu_possible_mask()
  * Added a comment to adjust_compat_task_affinity()

Cheers,

Will

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Morten Rasmussen <morten.rasmussen@arm.com>
Cc: Qais Yousef <qais.yousef@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Quentin Perret <qperret@google.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: kernel-team@android.com

--->8

Will Deacon (14):
  arm64: cpuinfo: Split AArch32 registers out into a separate struct
  arm64: Allow mismatched 32-bit EL0 support
  KVM: arm64: Kill 32-bit vCPUs on systems with mismatched EL0 support
  arm64: Kill 32-bit applications scheduled on 64-bit-only CPUs
  arm64: Advertise CPUs capable of running 32-bit applications in sysfs
  arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0
  sched: Introduce restrict_cpus_allowed_ptr() to limit task CPU
    affinity
  arm64: exec: Adjust affinity for compat tasks with mismatched 32-bit
    EL0
  cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1
  sched: Introduce arch_task_cpu_possible_mask() to limit fallback rq
    selection
  sched: Reject CPU affinity changes based on
    arch_task_cpu_possible_mask()
  arm64: Prevent offlining first CPU with 32-bit EL0 on mismatched
    system
  arm64: Implement arch_task_cpu_possible_mask()
  arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores

 .../ABI/testing/sysfs-devices-system-cpu      |   9 +
 .../admin-guide/kernel-parameters.txt         |   7 +
 arch/arm64/include/asm/cpu.h                  |  44 ++--
 arch/arm64/include/asm/cpucaps.h              |   2 +-
 arch/arm64/include/asm/cpufeature.h           |   8 +-
 arch/arm64/include/asm/mmu_context.h          |  13 ++
 arch/arm64/kernel/cpufeature.c                | 219 ++++++++++++++----
 arch/arm64/kernel/cpuinfo.c                   |  53 +++--
 arch/arm64/kernel/process.c                   |  47 +++-
 arch/arm64/kvm/arm.c                          |  11 +-
 include/linux/sched.h                         |   1 +
 kernel/cgroup/cpuset.c                        |   6 +-
 kernel/sched/core.c                           |  90 +++++--
 13 files changed, 401 insertions(+), 109 deletions(-)

-- 
2.29.2.454.gaff20da3a2-goog


WARNING: multiple messages have this Message-ID
From: Will Deacon <will@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Cc: linux-arch@vger.kernel.org, Marc Zyngier <maz@kernel.org>,
	kernel-team@android.com,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Juri Lelli <juri.lelli@redhat.com>,
	Quentin Perret <qperret@google.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	linux-kernel@vger.kernel.org, Qais Yousef <qais.yousef@arm.com>,
	Suren Baghdasaryan <surenb@google.com>,
	Ingo Molnar <mingo@redhat.com>, Li Zefan <lizefan@huawei.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Tejun Heo <tj@kernel.org>, Will Deacon <will@kernel.org>,
	Morten Rasmussen <morten.rasmussen@arm.com>
Subject: [PATCH v4 00/14] An alternative series for asymmetric AArch32 systems
Date: Tue, 24 Nov 2020 15:50:25 +0000	[thread overview]
Message-ID: <20201124155039.13804-1-will@kernel.org> (raw)

Hello folks,

Here's version four of the wonderful patches I previously posted here:

  v1: https://lore.kernel.org/r/20201027215118.27003-1-will@kernel.org
  v2: https://lore.kernel.org/r/20201109213023.15092-1-will@kernel.org
  v3: https://lore.kernel.org/r/20201113093720.21106-1-will@kernel.org

and which started life as a reimplementation of some patches from Qais:

  https://lore.kernel.org/r/20201021104611.2744565-1-qais.yousef@arm.com

The aim of this series is to allow 32-bit ARM applications to run on
arm64 SoCs where not all of the CPUs support the 32-bit instruction set.
Unfortunately, such SoCs are real and will continue to be productised
over the next few years at least.

Changes in v4 include:

  * Take into account the cpuset 'allowed' mask on exec
  * Print a warning if we forcefully override the affinity, like we do
    in select_fallback_rq()
  * Rename arch_cpu_allowed_mask() to arch_task_cpu_possible_mask()
  * Added a comment to adjust_compat_task_affinity()

Cheers,

Will

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Morten Rasmussen <morten.rasmussen@arm.com>
Cc: Qais Yousef <qais.yousef@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Quentin Perret <qperret@google.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: kernel-team@android.com

--->8

Will Deacon (14):
  arm64: cpuinfo: Split AArch32 registers out into a separate struct
  arm64: Allow mismatched 32-bit EL0 support
  KVM: arm64: Kill 32-bit vCPUs on systems with mismatched EL0 support
  arm64: Kill 32-bit applications scheduled on 64-bit-only CPUs
  arm64: Advertise CPUs capable of running 32-bit applications in sysfs
  arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0
  sched: Introduce restrict_cpus_allowed_ptr() to limit task CPU
    affinity
  arm64: exec: Adjust affinity for compat tasks with mismatched 32-bit
    EL0
  cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1
  sched: Introduce arch_task_cpu_possible_mask() to limit fallback rq
    selection
  sched: Reject CPU affinity changes based on
    arch_task_cpu_possible_mask()
  arm64: Prevent offlining first CPU with 32-bit EL0 on mismatched
    system
  arm64: Implement arch_task_cpu_possible_mask()
  arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores

 .../ABI/testing/sysfs-devices-system-cpu      |   9 +
 .../admin-guide/kernel-parameters.txt         |   7 +
 arch/arm64/include/asm/cpu.h                  |  44 ++--
 arch/arm64/include/asm/cpucaps.h              |   2 +-
 arch/arm64/include/asm/cpufeature.h           |   8 +-
 arch/arm64/include/asm/mmu_context.h          |  13 ++
 arch/arm64/kernel/cpufeature.c                | 219 ++++++++++++++----
 arch/arm64/kernel/cpuinfo.c                   |  53 +++--
 arch/arm64/kernel/process.c                   |  47 +++-
 arch/arm64/kvm/arm.c                          |  11 +-
 include/linux/sched.h                         |   1 +
 kernel/cgroup/cpuset.c                        |   6 +-
 kernel/sched/core.c                           |  90 +++++--
 13 files changed, 401 insertions(+), 109 deletions(-)

-- 
2.29.2.454.gaff20da3a2-goog


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             reply	other threads:[~2020-11-24 15:51 UTC|newest]

Thread overview: 122+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-24 15:50 Will Deacon [this message]
2020-11-24 15:50 ` Will Deacon
2020-11-24 15:50 ` [PATCH v4 01/14] arm64: cpuinfo: Split AArch32 registers out into a separate struct Will Deacon
2020-11-24 15:50   ` Will Deacon
2020-11-24 15:50 ` [PATCH v4 02/14] arm64: Allow mismatched 32-bit EL0 support Will Deacon
2020-11-24 15:50   ` Will Deacon
2020-11-27 10:25   ` Marc Zyngier
2020-11-27 10:25     ` Marc Zyngier
2020-11-27 11:50     ` Will Deacon
2020-11-27 11:50       ` Will Deacon
2020-11-27 13:09   ` Qais Yousef
2020-11-27 13:09     ` Qais Yousef
2020-12-01 16:56     ` Will Deacon
2020-12-01 16:56       ` Will Deacon
2020-12-02 13:16       ` Qais Yousef
2020-12-02 13:16         ` Qais Yousef
2020-11-24 15:50 ` [PATCH v4 03/14] KVM: arm64: Kill 32-bit vCPUs on systems with mismatched " Will Deacon
2020-11-24 15:50   ` Will Deacon
2020-11-27 10:26   ` Marc Zyngier
2020-11-27 10:26     ` Marc Zyngier
2020-11-27 11:53     ` Will Deacon
2020-11-27 11:53       ` Will Deacon
2020-11-27 17:14       ` Marc Zyngier
2020-11-27 17:14         ` Marc Zyngier
2020-11-27 17:24         ` Quentin Perret
2020-11-27 17:24           ` Quentin Perret
2020-11-27 18:16           ` Marc Zyngier
2020-11-27 18:16             ` Marc Zyngier
2020-12-01 16:57             ` Will Deacon
2020-12-01 16:57               ` Will Deacon
2020-12-02  8:18               ` Marc Zyngier
2020-12-02  8:18                 ` Marc Zyngier
2020-12-02 17:27                 ` Will Deacon
2020-12-02 17:27                   ` Will Deacon
2020-11-24 15:50 ` [PATCH v4 04/14] arm64: Kill 32-bit applications scheduled on 64-bit-only CPUs Will Deacon
2020-11-24 15:50   ` Will Deacon
2020-11-27 13:12   ` Qais Yousef
2020-11-27 13:12     ` Qais Yousef
2020-12-01 16:56     ` Will Deacon
2020-12-01 16:56       ` Will Deacon
2020-12-02 13:52       ` Qais Yousef
2020-12-02 13:52         ` Qais Yousef
2020-12-02 17:42         ` Will Deacon
2020-12-02 17:42           ` Will Deacon
2020-11-24 15:50 ` [PATCH v4 05/14] arm64: Advertise CPUs capable of running 32-bit applications in sysfs Will Deacon
2020-11-24 15:50   ` Will Deacon
2020-11-24 15:50 ` [PATCH v4 06/14] arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 Will Deacon
2020-11-24 15:50   ` Will Deacon
2020-11-27 13:17   ` Qais Yousef
2020-11-27 13:17     ` Qais Yousef
2020-12-01 16:56     ` Will Deacon
2020-12-01 16:56       ` Will Deacon
2020-11-24 15:50 ` [PATCH v4 07/14] sched: Introduce restrict_cpus_allowed_ptr() to limit task CPU affinity Will Deacon
2020-11-24 15:50   ` Will Deacon
2020-11-27  9:49   ` Quentin Perret
2020-11-27  9:49     ` Quentin Perret
2020-11-27 13:19   ` Qais Yousef
2020-11-27 13:19     ` Qais Yousef
2020-12-01 16:56     ` Will Deacon
2020-12-01 16:56       ` Will Deacon
2020-12-02 13:06       ` Qais Yousef
2020-12-02 13:06         ` Qais Yousef
2020-11-24 15:50 ` [PATCH v4 08/14] arm64: exec: Adjust affinity for compat tasks with mismatched 32-bit EL0 Will Deacon
2020-11-24 15:50   ` Will Deacon
2020-11-27 10:01   ` Quentin Perret
2020-11-27 10:01     ` Quentin Perret
2020-11-27 13:23   ` Qais Yousef
2020-11-27 13:23     ` Qais Yousef
2020-12-01 16:55     ` Will Deacon
2020-12-01 16:55       ` Will Deacon
2020-12-02 14:07       ` Qais Yousef
2020-12-02 14:07         ` Qais Yousef
2020-11-24 15:50 ` [PATCH v4 09/14] cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1 Will Deacon
2020-11-24 15:50   ` Will Deacon
2020-11-27 13:32   ` Qais Yousef
2020-11-27 13:32     ` Qais Yousef
2020-11-30 17:05     ` Qais Yousef
2020-11-30 17:05       ` Qais Yousef
2020-11-30 17:36       ` Quentin Perret
2020-11-30 17:36         ` Quentin Perret
2020-12-01 11:58         ` Qais Yousef
2020-12-01 11:58           ` Qais Yousef
2020-12-01 12:37           ` Quentin Perret
2020-12-01 12:37             ` Quentin Perret
2020-12-01 14:11             ` Qais Yousef
2020-12-01 14:11               ` Qais Yousef
2020-12-01 15:56               ` Quentin Perret
2020-12-01 15:56                 ` Quentin Perret
2020-12-01 22:30                 ` Will Deacon
2020-12-01 22:30                   ` Will Deacon
2020-12-02 11:34                   ` Qais Yousef
2020-12-02 11:34                     ` Qais Yousef
2020-12-02 11:33                 ` Qais Yousef
2020-12-02 11:33                   ` Qais Yousef
2020-11-24 15:50 ` [PATCH v4 10/14] sched: Introduce arch_task_cpu_possible_mask() to limit fallback rq selection Will Deacon
2020-11-24 15:50   ` Will Deacon
2020-11-24 15:50 ` [PATCH v4 11/14] sched: Reject CPU affinity changes based on arch_task_cpu_possible_mask() Will Deacon
2020-11-24 15:50   ` Will Deacon
2020-11-27  9:54   ` Quentin Perret
2020-11-27  9:54     ` Quentin Perret
2020-11-24 15:50 ` [PATCH v4 12/14] arm64: Prevent offlining first CPU with 32-bit EL0 on mismatched system Will Deacon
2020-11-24 15:50   ` Will Deacon
2020-11-27 13:41   ` Qais Yousef
2020-11-27 13:41     ` Qais Yousef
2020-12-01 22:13     ` Will Deacon
2020-12-01 22:13       ` Will Deacon
2020-12-02 12:59       ` Qais Yousef
2020-12-02 12:59         ` Qais Yousef
2020-12-02 17:42         ` Will Deacon
2020-12-02 17:42           ` Will Deacon
2020-12-02 18:08           ` Qais Yousef
2020-12-02 18:08             ` Qais Yousef
2020-11-24 15:50 ` [PATCH v4 13/14] arm64: Implement arch_task_cpu_possible_mask() Will Deacon
2020-11-24 15:50   ` Will Deacon
2020-11-27 13:41   ` Qais Yousef
2020-11-27 13:41     ` Qais Yousef
2020-11-24 15:50 ` [PATCH v4 14/14] arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores Will Deacon
2020-11-24 15:50   ` Will Deacon
2020-11-27 13:58 ` [PATCH v4 00/14] An alternative series for asymmetric AArch32 systems Qais Yousef
2020-11-27 13:58   ` Qais Yousef
2020-12-05 20:43 ` Pavel Machek
2020-12-05 20:43   ` Pavel Machek

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