| Message ID | 20210608180313.11502-1-will@kernel.org (mailing list archive) |
|---|---|
| Headers | show |
| Series | Add support for 32-bit tasks on asymmetric AArch32 systems | expand |
On Tue, 8 Jun 2021 19:02:53 +0100, Will Deacon wrote: > The sun is shining and its time for your weekly dose of asymmetric > 32-bit support patches, previously seen at: > > 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 > v4: https://lore.kernel.org/r/20201124155039.13804-1-will@kernel.org > v5: https://lore.kernel.org/r/20201208132835.6151-1-will@kernel.org > v6: https://lore.kernel.org/r/20210518094725.7701-1-will@kernel.org > v7: https://lore.kernel.org/r/20210525151432.16875-1-will@kernel.org > v8: https://lore.kernel.org/r/20210602164719.31777-1-will@kernel.org > > [...] Since patches 1-4 are all arm64, don't do any harm on their own and conflict significantly with other arm64 changes queued for 5.14, I've queued them in the arm64 tree on the stable for-next/cpufeature branch: [01/20] arm64: cpuinfo: Split AArch32 registers out into a separate struct https://git.kernel.org/arm64/c/930a58b4093e [02/20] arm64: Allow mismatched 32-bit EL0 support https://git.kernel.org/arm64/c/2122a833316f [03/20] KVM: arm64: Kill 32-bit vCPUs on systems with mismatched EL0 support https://git.kernel.org/arm64/c/2f6a49bbc01d [04/20] arm64: Kill 32-bit applications scheduled on 64-bit-only CPUs https://git.kernel.org/arm64/c/873c3e89777c Cheers,
Hi everyone, The sun is shining and its time for your weekly dose of asymmetric 32-bit support patches, previously seen at: 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 v4: https://lore.kernel.org/r/20201124155039.13804-1-will@kernel.org v5: https://lore.kernel.org/r/20201208132835.6151-1-will@kernel.org v6: https://lore.kernel.org/r/20210518094725.7701-1-will@kernel.org v7: https://lore.kernel.org/r/20210525151432.16875-1-will@kernel.org v8: https://lore.kernel.org/r/20210602164719.31777-1-will@kernel.org There was also a nice LWN writeup in case you've forgotten what this is about: https://lwn.net/Articles/838339/ Changes since v8 include: * Renamed task_cpus_dl_admissible() and changed return type [Daniel] * Renamed update_mismatched_32bit_el0_cpu_features() [Mark R] * Improved comments [Mark R and Valentin] * Cleaned up cpuset_cpus_allowed_fallback() [Valentin] * Remove redundant rcu_read_{lock,unlock}() in cpuset_cpus_allowed() * Added some more acks/reviewed-by tags 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: 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: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Dietmar Eggemann <dietmar.eggemann@arm.com> Cc: Daniel Bristot de Oliveira <bristot@redhat.com> Cc: Valentin Schneider <valentin.schneider@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: kernel-team@android.com --->8 Will Deacon (20): 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 sched: Introduce task_cpu_possible_mask() to limit fallback rq selection cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1 cpuset: Honour task_cpu_possible_mask() in guarantee_online_cpus() cpuset: Cleanup cpuset_cpus_allowed_fallback() use in select_fallback_rq() sched: Reject CPU affinity changes based on task_cpu_possible_mask() sched: Introduce task_struct::user_cpus_ptr to track requested affinity sched: Split the guts of sched_setaffinity() into a helper function sched: Allow task CPU affinity to be restricted on asymmetric systems sched: Introduce dl_task_check_affinity() to check proposed affinity arm64: Implement task_cpu_possible_mask() arm64: exec: Adjust affinity for compat tasks with mismatched 32-bit EL0 arm64: Prevent offlining first CPU with 32-bit EL0 on mismatched system arm64: Advertise CPUs capable of running 32-bit applications in sysfs arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores Documentation: arm64: describe asymmetric 32-bit support .../ABI/testing/sysfs-devices-system-cpu | 9 + .../admin-guide/kernel-parameters.txt | 11 + Documentation/arm64/asymmetric-32bit.rst | 155 ++++++++ Documentation/arm64/index.rst | 1 + arch/arm64/include/asm/cpu.h | 44 +-- arch/arm64/include/asm/cpufeature.h | 8 +- arch/arm64/include/asm/elf.h | 6 +- arch/arm64/include/asm/mmu_context.h | 13 + arch/arm64/kernel/cpufeature.c | 232 +++++++++--- arch/arm64/kernel/cpuinfo.c | 53 +-- arch/arm64/kernel/process.c | 44 ++- arch/arm64/kvm/arm.c | 11 +- arch/arm64/tools/cpucaps | 3 +- include/linux/cpuset.h | 8 +- include/linux/mmu_context.h | 14 + include/linux/sched.h | 21 ++ init/init_task.c | 1 + kernel/cgroup/cpuset.c | 59 +-- kernel/fork.c | 2 + kernel/sched/core.c | 340 ++++++++++++++---- kernel/sched/sched.h | 1 + 21 files changed, 841 insertions(+), 195 deletions(-) create mode 100644 Documentation/arm64/asymmetric-32bit.rst