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>, Johannes Weiner <hannes@cmpxchg.org>, Ingo Molnar <mingo@redhat.com>, Juri Lelli <juri.lelli@redhat.com>, Vincent Guittot <vincent.guittot@linaro.org>, "Rafael J. Wysocki" <rjw@rjwysocki.net>, Dietmar Eggemann <dietmar.eggemann@arm.com>, Daniel Bristot de Oliveira <bristot@redhat.com>, Valentin Schneider <valentin.schneider@arm.com>, kernel-team@android.com Subject: [PATCH v8 17/19] arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 Date: Wed, 2 Jun 2021 17:47:17 +0100 [thread overview] Message-ID: <20210602164719.31777-18-will@kernel.org> (raw) In-Reply-To: <20210602164719.31777-1-will@kernel.org> Allow systems with mismatched 32-bit support at EL0 to run 32-bit applications based on a new kernel parameter. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will@kernel.org> --- Documentation/admin-guide/kernel-parameters.txt | 8 ++++++++ arch/arm64/kernel/cpufeature.c | 7 +++++++ 2 files changed, 15 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index cb89dbdedc46..a2e453919bb6 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -287,6 +287,14 @@ do not want to use tracing_snapshot_alloc() as it needs to be done where GFP_KERNEL allocations are allowed. + allow_mismatched_32bit_el0 [ARM64] + Allow execve() of 32-bit applications and setting of the + PER_LINUX32 personality on systems where only a strict + subset of the CPUs support 32-bit EL0. When this + parameter is present, the set of CPUs supporting 32-bit + EL0 is indicated by /sys/devices/system/cpu/aarch32_el0 + and hot-unplug operations may be restricted. + amd_iommu= [HW,X86-64] Pass parameters to the AMD IOMMU driver in the system. Possible values are: diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 72efdc611b14..f2c97baa050f 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1298,6 +1298,13 @@ const struct cpumask *system_32bit_el0_cpumask(void) return cpu_possible_mask; } +static int __init parse_32bit_el0_param(char *str) +{ + allow_mismatched_32bit_el0 = true; + return 0; +} +early_param("allow_mismatched_32bit_el0", parse_32bit_el0_param); + static ssize_t aarch32_el0_show(struct device *dev, struct device_attribute *attr, char *buf) { -- 2.32.0.rc0.204.g9fa02ecfa5-goog
WARNING: multiple messages have this Message-ID (diff)
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>, Johannes Weiner <hannes@cmpxchg.org>, Ingo Molnar <mingo@redhat.com>, Juri Lelli <juri.lelli@redhat.com>, Vincent Guittot <vincent.guittot@linaro.org>, "Rafael J. Wysocki" <rjw@rjwysocki.net>, Dietmar Eggemann <dietmar.eggemann@arm.com>, Daniel Bristot de Oliveira <bristot@redhat.com>, Valentin Schneider <valentin.schneider@arm.com>, kernel-team@android.com Subject: [PATCH v8 17/19] arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 Date: Wed, 2 Jun 2021 17:47:17 +0100 [thread overview] Message-ID: <20210602164719.31777-18-will@kernel.org> (raw) In-Reply-To: <20210602164719.31777-1-will@kernel.org> Allow systems with mismatched 32-bit support at EL0 to run 32-bit applications based on a new kernel parameter. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will@kernel.org> --- Documentation/admin-guide/kernel-parameters.txt | 8 ++++++++ arch/arm64/kernel/cpufeature.c | 7 +++++++ 2 files changed, 15 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index cb89dbdedc46..a2e453919bb6 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -287,6 +287,14 @@ do not want to use tracing_snapshot_alloc() as it needs to be done where GFP_KERNEL allocations are allowed. + allow_mismatched_32bit_el0 [ARM64] + Allow execve() of 32-bit applications and setting of the + PER_LINUX32 personality on systems where only a strict + subset of the CPUs support 32-bit EL0. When this + parameter is present, the set of CPUs supporting 32-bit + EL0 is indicated by /sys/devices/system/cpu/aarch32_el0 + and hot-unplug operations may be restricted. + amd_iommu= [HW,X86-64] Pass parameters to the AMD IOMMU driver in the system. Possible values are: diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 72efdc611b14..f2c97baa050f 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1298,6 +1298,13 @@ const struct cpumask *system_32bit_el0_cpumask(void) return cpu_possible_mask; } +static int __init parse_32bit_el0_param(char *str) +{ + allow_mismatched_32bit_el0 = true; + return 0; +} +early_param("allow_mismatched_32bit_el0", parse_32bit_el0_param); + static ssize_t aarch32_el0_show(struct device *dev, struct device_attribute *attr, char *buf) { -- 2.32.0.rc0.204.g9fa02ecfa5-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-06-02 16:48 UTC|newest] Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-06-02 16:47 [PATCH v8 00/19] Add support for 32-bit tasks on asymmetric AArch32 systems Will Deacon 2021-06-02 16:47 ` Will Deacon 2021-06-02 16:47 ` [PATCH v8 01/19] arm64: cpuinfo: Split AArch32 registers out into a separate struct Will Deacon 2021-06-02 16:47 ` Will Deacon 2021-06-03 12:38 ` Mark Rutland 2021-06-03 12:38 ` Mark Rutland 2021-06-03 17:24 ` Will Deacon 2021-06-03 17:24 ` Will Deacon 2021-06-02 16:47 ` [PATCH v8 02/19] arm64: Allow mismatched 32-bit EL0 support Will Deacon 2021-06-02 16:47 ` Will Deacon 2021-06-03 12:37 ` Mark Rutland 2021-06-03 12:37 ` Mark Rutland 2021-06-03 17:44 ` Will Deacon 2021-06-03 17:44 ` Will Deacon 2021-06-04 9:38 ` Mark Rutland 2021-06-04 9:38 ` Mark Rutland 2021-06-04 11:05 ` Will Deacon 2021-06-04 11:05 ` Will Deacon 2021-06-04 12:04 ` Mark Rutland 2021-06-04 12:04 ` Mark Rutland 2021-06-04 13:50 ` Will Deacon 2021-06-04 13:50 ` Will Deacon 2021-06-02 16:47 ` [PATCH v8 03/19] KVM: arm64: Kill 32-bit vCPUs on systems with mismatched " Will Deacon 2021-06-02 16:47 ` Will Deacon 2021-06-02 16:47 ` [PATCH v8 04/19] arm64: Kill 32-bit applications scheduled on 64-bit-only CPUs Will Deacon 2021-06-02 16:47 ` Will Deacon 2021-06-02 16:47 ` [PATCH v8 05/19] sched: Introduce task_cpu_possible_mask() to limit fallback rq selection Will Deacon 2021-06-02 16:47 ` Will Deacon 2021-06-04 17:10 ` Valentin Schneider 2021-06-04 17:10 ` Valentin Schneider 2021-06-07 17:04 ` Will Deacon 2021-06-07 17:04 ` Will Deacon 2021-06-02 16:47 ` [PATCH v8 06/19] cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1 Will Deacon 2021-06-02 16:47 ` Will Deacon 2021-06-04 17:11 ` Valentin Schneider 2021-06-04 17:11 ` Valentin Schneider 2021-06-07 17:20 ` Will Deacon 2021-06-07 17:20 ` Will Deacon 2021-06-10 10:20 ` Valentin Schneider 2021-06-10 10:20 ` Valentin Schneider 2021-06-02 16:47 ` [PATCH v8 07/19] cpuset: Honour task_cpu_possible_mask() in guarantee_online_cpus() Will Deacon 2021-06-02 16:47 ` Will Deacon 2021-06-04 17:11 ` Valentin Schneider 2021-06-04 17:11 ` Valentin Schneider 2021-06-02 16:47 ` [PATCH v8 08/19] sched: Reject CPU affinity changes based on task_cpu_possible_mask() Will Deacon 2021-06-02 16:47 ` Will Deacon 2021-06-04 17:11 ` Valentin Schneider 2021-06-04 17:11 ` Valentin Schneider 2021-06-07 22:43 ` Will Deacon 2021-06-07 22:43 ` Will Deacon 2021-06-02 16:47 ` [PATCH v8 09/19] sched: Introduce task_struct::user_cpus_ptr to track requested affinity Will Deacon 2021-06-02 16:47 ` Will Deacon 2021-06-04 17:12 ` Valentin Schneider 2021-06-04 17:12 ` Valentin Schneider 2021-06-02 16:47 ` [PATCH v8 10/19] sched: Split the guts of sched_setaffinity() into a helper function Will Deacon 2021-06-02 16:47 ` Will Deacon 2021-06-04 17:12 ` Valentin Schneider 2021-06-04 17:12 ` Valentin Schneider 2021-06-02 16:47 ` [PATCH v8 11/19] sched: Allow task CPU affinity to be restricted on asymmetric systems Will Deacon 2021-06-02 16:47 ` Will Deacon 2021-06-04 17:12 ` Valentin Schneider 2021-06-04 17:12 ` Valentin Schneider 2021-06-07 22:52 ` Will Deacon 2021-06-07 22:52 ` Will Deacon 2021-06-10 10:20 ` Valentin Schneider 2021-06-10 10:20 ` Valentin Schneider 2021-06-02 16:47 ` [PATCH v8 12/19] sched: Introduce task_cpus_dl_admissible() to check proposed affinity Will Deacon 2021-06-02 16:47 ` Will Deacon 2021-06-03 9:43 ` Daniel Bristot de Oliveira 2021-06-03 9:43 ` Daniel Bristot de Oliveira 2021-06-03 9:52 ` Will Deacon 2021-06-03 9:52 ` Will Deacon 2021-06-02 16:47 ` [PATCH v8 13/19] arm64: Implement task_cpu_possible_mask() Will Deacon 2021-06-02 16:47 ` Will Deacon 2021-06-02 16:47 ` [PATCH v8 14/19] arm64: exec: Adjust affinity for compat tasks with mismatched 32-bit EL0 Will Deacon 2021-06-02 16:47 ` Will Deacon 2021-06-03 9:45 ` Daniel Bristot de Oliveira 2021-06-03 9:45 ` Daniel Bristot de Oliveira 2021-06-02 16:47 ` [PATCH v8 15/19] arm64: Prevent offlining first CPU with 32-bit EL0 on mismatched system Will Deacon 2021-06-02 16:47 ` Will Deacon 2021-06-03 12:58 ` Mark Rutland 2021-06-03 12:58 ` Mark Rutland 2021-06-03 17:40 ` Will Deacon 2021-06-03 17:40 ` Will Deacon 2021-06-04 9:49 ` Mark Rutland 2021-06-04 9:49 ` Mark Rutland 2021-06-04 12:14 ` Qais Yousef 2021-06-04 12:14 ` Qais Yousef 2021-06-02 16:47 ` [PATCH v8 16/19] arm64: Advertise CPUs capable of running 32-bit applications in sysfs Will Deacon 2021-06-02 16:47 ` Will Deacon 2021-06-02 16:47 ` Will Deacon [this message] 2021-06-02 16:47 ` [PATCH v8 17/19] arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 Will Deacon 2021-06-02 16:47 ` [PATCH v8 18/19] arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores Will Deacon 2021-06-02 16:47 ` Will Deacon 2021-06-02 16:47 ` [PATCH v8 19/19] Documentation: arm64: describe asymmetric 32-bit support Will Deacon 2021-06-02 16:47 ` Will Deacon
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