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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>,
	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>,
	Mark Rutland <mark.rutland@arm.com>,
	kernel-team@android.com
Subject: [PATCH v10 10/16] arm64: Implement task_cpu_possible_mask()
Date: Wed, 23 Jun 2021 18:38:42 +0100	[thread overview]
Message-ID: <20210623173848.318-11-will@kernel.org> (raw)
In-Reply-To: <20210623173848.318-1-will@kernel.org>

Provide an implementation of task_cpu_possible_mask() so that we can
prevent 64-bit-only cores being added to the 'cpus_mask' for compat
tasks on systems with mismatched 32-bit support at EL0,

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
---
 arch/arm64/include/asm/mmu_context.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm64/include/asm/mmu_context.h b/arch/arm64/include/asm/mmu_context.h
index d3cef9133539..bb9b7510f334 100644
--- a/arch/arm64/include/asm/mmu_context.h
+++ b/arch/arm64/include/asm/mmu_context.h
@@ -231,6 +231,19 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next,
 	update_saved_ttbr0(tsk, next);
 }
 
+static inline const struct cpumask *
+task_cpu_possible_mask(struct task_struct *p)
+{
+	if (!static_branch_unlikely(&arm64_mismatched_32bit_el0))
+		return cpu_possible_mask;
+
+	if (!is_compat_thread(task_thread_info(p)))
+		return cpu_possible_mask;
+
+	return system_32bit_el0_cpumask();
+}
+#define task_cpu_possible_mask	task_cpu_possible_mask
+
 void verify_cpu_asid_bits(void);
 void post_ttbr_update_workaround(void);
 
-- 
2.32.0.93.g670b81a890-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>,
	Mark Rutland <mark.rutland@arm.com>,
	kernel-team@android.com
Subject: [PATCH v10 10/16] arm64: Implement task_cpu_possible_mask()
Date: Wed, 23 Jun 2021 18:38:42 +0100	[thread overview]
Message-ID: <20210623173848.318-11-will@kernel.org> (raw)
In-Reply-To: <20210623173848.318-1-will@kernel.org>

Provide an implementation of task_cpu_possible_mask() so that we can
prevent 64-bit-only cores being added to the 'cpus_mask' for compat
tasks on systems with mismatched 32-bit support at EL0,

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
---
 arch/arm64/include/asm/mmu_context.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm64/include/asm/mmu_context.h b/arch/arm64/include/asm/mmu_context.h
index d3cef9133539..bb9b7510f334 100644
--- a/arch/arm64/include/asm/mmu_context.h
+++ b/arch/arm64/include/asm/mmu_context.h
@@ -231,6 +231,19 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next,
 	update_saved_ttbr0(tsk, next);
 }
 
+static inline const struct cpumask *
+task_cpu_possible_mask(struct task_struct *p)
+{
+	if (!static_branch_unlikely(&arm64_mismatched_32bit_el0))
+		return cpu_possible_mask;
+
+	if (!is_compat_thread(task_thread_info(p)))
+		return cpu_possible_mask;
+
+	return system_32bit_el0_cpumask();
+}
+#define task_cpu_possible_mask	task_cpu_possible_mask
+
 void verify_cpu_asid_bits(void);
 void post_ttbr_update_workaround(void);
 
-- 
2.32.0.93.g670b81a890-goog


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  parent reply	other threads:[~2021-06-23 17:39 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-23 17:38 [PATCH v10 00/16] Add support for 32-bit tasks on asymmetric AArch32 systems Will Deacon
2021-06-23 17:38 ` Will Deacon
2021-06-23 17:38 ` [PATCH v10 01/16] sched: Introduce task_cpu_possible_mask() to limit fallback rq selection Will Deacon
2021-06-23 17:38   ` Will Deacon
2021-06-23 17:38 ` [PATCH v10 02/16] cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1 Will Deacon
2021-06-23 17:38   ` Will Deacon
2021-06-23 17:38 ` [PATCH v10 03/16] cpuset: Honour task_cpu_possible_mask() in guarantee_online_cpus() Will Deacon
2021-06-23 17:38   ` Will Deacon
2021-06-23 17:38 ` [PATCH v10 04/16] cpuset: Cleanup cpuset_cpus_allowed_fallback() use in select_fallback_rq() Will Deacon
2021-06-23 17:38   ` Will Deacon
2021-06-23 17:38 ` [PATCH v10 05/16] sched: Reject CPU affinity changes based on task_cpu_possible_mask() Will Deacon
2021-06-23 17:38   ` Will Deacon
2021-06-23 17:38 ` [PATCH v10 06/16] sched: Introduce task_struct::user_cpus_ptr to track requested affinity Will Deacon
2021-06-23 17:38   ` Will Deacon
2021-06-23 17:38 ` [PATCH v10 07/16] sched: Split the guts of sched_setaffinity() into a helper function Will Deacon
2021-06-23 17:38   ` Will Deacon
2021-06-23 17:38 ` [PATCH v10 08/16] sched: Allow task CPU affinity to be restricted on asymmetric systems Will Deacon
2021-06-23 17:38   ` Will Deacon
2021-06-23 17:38 ` [PATCH v10 09/16] sched: Introduce dl_task_check_affinity() to check proposed affinity Will Deacon
2021-06-23 17:38   ` Will Deacon
2021-06-23 17:38 ` Will Deacon [this message]
2021-06-23 17:38   ` [PATCH v10 10/16] arm64: Implement task_cpu_possible_mask() Will Deacon
2021-06-23 17:38 ` [PATCH v10 11/16] arm64: exec: Adjust affinity for compat tasks with mismatched 32-bit EL0 Will Deacon
2021-06-23 17:38   ` Will Deacon
2021-06-23 17:38 ` [PATCH v10 12/16] arm64: Prevent offlining first CPU with 32-bit EL0 on mismatched system Will Deacon
2021-06-23 17:38   ` Will Deacon
2021-06-23 17:38 ` [PATCH v10 13/16] arm64: Advertise CPUs capable of running 32-bit applications in sysfs Will Deacon
2021-06-23 17:38   ` Will Deacon
2021-06-25  8:46   ` Greg Kroah-Hartman
2021-06-25  8:46     ` Greg Kroah-Hartman
2021-06-25  9:36     ` Will Deacon
2021-06-25  9:36       ` Will Deacon
2021-06-25  9:49       ` Greg Kroah-Hartman
2021-06-25  9:49         ` Greg Kroah-Hartman
2021-06-23 17:38 ` [PATCH v10 14/16] arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 Will Deacon
2021-06-23 17:38   ` Will Deacon
2021-06-23 17:38 ` [PATCH v10 15/16] arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores Will Deacon
2021-06-23 17:38   ` Will Deacon
2021-06-23 17:38 ` [PATCH v10 16/16] Documentation: arm64: describe asymmetric 32-bit support Will Deacon
2021-06-23 17:38   ` Will Deacon

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