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kvm_vcpu_kick() is not NMI safe. When the overflow handler is called from NMI context, defer waking the vcpu to an irq_work queue. A vcpu can be freed while it's not running by kvm_destroy_vm(). Prevent running the irq_work for a non-existent vcpu by calling irq_work_sync() on the PMU destroy path. [Alexandru E.: Added irq_work_sync()] Signed-off-by: Julien Thierry <julien.thierry@arm.com> Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com> Tested-by: Sumit Garg <sumit.garg@linaro.org> (Developerbox) Cc: Julien Thierry <julien.thierry.kdev@gmail.com> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: James Morse <james.morse@arm.com> Cc: Suzuki K Pouloze <suzuki.poulose@arm.com> Cc: kvm@vger.kernel.org Cc: kvmarm@lists.cs.columbia.edu Link: https://lore.kernel.org/r/20200924110706.254996-6-alexandru.elisei@arm.com Signed-off-by: Will Deacon <will@kernel.org>
114 lines
3.9 KiB
C
114 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2015 Linaro Ltd.
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* Author: Shannon Zhao <shannon.zhao@linaro.org>
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*/
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#ifndef __ASM_ARM_KVM_PMU_H
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#define __ASM_ARM_KVM_PMU_H
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#include <linux/perf_event.h>
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#include <asm/perf_event.h>
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#define ARMV8_PMU_CYCLE_IDX (ARMV8_PMU_MAX_COUNTERS - 1)
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#define ARMV8_PMU_MAX_COUNTER_PAIRS ((ARMV8_PMU_MAX_COUNTERS + 1) >> 1)
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#ifdef CONFIG_KVM_ARM_PMU
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struct kvm_pmc {
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u8 idx; /* index into the pmu->pmc array */
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struct perf_event *perf_event;
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};
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struct kvm_pmu {
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int irq_num;
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struct kvm_pmc pmc[ARMV8_PMU_MAX_COUNTERS];
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DECLARE_BITMAP(chained, ARMV8_PMU_MAX_COUNTER_PAIRS);
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bool ready;
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bool created;
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bool irq_level;
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struct irq_work overflow_work;
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};
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#define kvm_arm_pmu_v3_ready(v) ((v)->arch.pmu.ready)
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#define kvm_arm_pmu_irq_initialized(v) ((v)->arch.pmu.irq_num >= VGIC_NR_SGIS)
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u64 kvm_pmu_get_counter_value(struct kvm_vcpu *vcpu, u64 select_idx);
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void kvm_pmu_set_counter_value(struct kvm_vcpu *vcpu, u64 select_idx, u64 val);
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u64 kvm_pmu_valid_counter_mask(struct kvm_vcpu *vcpu);
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void kvm_pmu_vcpu_init(struct kvm_vcpu *vcpu);
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void kvm_pmu_vcpu_reset(struct kvm_vcpu *vcpu);
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void kvm_pmu_vcpu_destroy(struct kvm_vcpu *vcpu);
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void kvm_pmu_disable_counter_mask(struct kvm_vcpu *vcpu, u64 val);
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void kvm_pmu_enable_counter_mask(struct kvm_vcpu *vcpu, u64 val);
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void kvm_pmu_flush_hwstate(struct kvm_vcpu *vcpu);
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void kvm_pmu_sync_hwstate(struct kvm_vcpu *vcpu);
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bool kvm_pmu_should_notify_user(struct kvm_vcpu *vcpu);
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void kvm_pmu_update_run(struct kvm_vcpu *vcpu);
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void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val);
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void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val);
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void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, u64 data,
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u64 select_idx);
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bool kvm_arm_support_pmu_v3(void);
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int kvm_arm_pmu_v3_set_attr(struct kvm_vcpu *vcpu,
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struct kvm_device_attr *attr);
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int kvm_arm_pmu_v3_get_attr(struct kvm_vcpu *vcpu,
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struct kvm_device_attr *attr);
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int kvm_arm_pmu_v3_has_attr(struct kvm_vcpu *vcpu,
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struct kvm_device_attr *attr);
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int kvm_arm_pmu_v3_enable(struct kvm_vcpu *vcpu);
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#else
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struct kvm_pmu {
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};
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#define kvm_arm_pmu_v3_ready(v) (false)
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#define kvm_arm_pmu_irq_initialized(v) (false)
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static inline u64 kvm_pmu_get_counter_value(struct kvm_vcpu *vcpu,
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u64 select_idx)
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{
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return 0;
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}
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static inline void kvm_pmu_set_counter_value(struct kvm_vcpu *vcpu,
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u64 select_idx, u64 val) {}
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static inline u64 kvm_pmu_valid_counter_mask(struct kvm_vcpu *vcpu)
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{
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return 0;
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}
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static inline void kvm_pmu_vcpu_init(struct kvm_vcpu *vcpu) {}
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static inline void kvm_pmu_vcpu_reset(struct kvm_vcpu *vcpu) {}
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static inline void kvm_pmu_vcpu_destroy(struct kvm_vcpu *vcpu) {}
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static inline void kvm_pmu_disable_counter_mask(struct kvm_vcpu *vcpu, u64 val) {}
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static inline void kvm_pmu_enable_counter_mask(struct kvm_vcpu *vcpu, u64 val) {}
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static inline void kvm_pmu_flush_hwstate(struct kvm_vcpu *vcpu) {}
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static inline void kvm_pmu_sync_hwstate(struct kvm_vcpu *vcpu) {}
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static inline bool kvm_pmu_should_notify_user(struct kvm_vcpu *vcpu)
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{
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return false;
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}
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static inline void kvm_pmu_update_run(struct kvm_vcpu *vcpu) {}
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static inline void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val) {}
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static inline void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val) {}
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static inline void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu,
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u64 data, u64 select_idx) {}
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static inline bool kvm_arm_support_pmu_v3(void) { return false; }
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static inline int kvm_arm_pmu_v3_set_attr(struct kvm_vcpu *vcpu,
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struct kvm_device_attr *attr)
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{
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return -ENXIO;
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}
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static inline int kvm_arm_pmu_v3_get_attr(struct kvm_vcpu *vcpu,
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struct kvm_device_attr *attr)
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{
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return -ENXIO;
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}
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static inline int kvm_arm_pmu_v3_has_attr(struct kvm_vcpu *vcpu,
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struct kvm_device_attr *attr)
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{
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return -ENXIO;
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}
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static inline int kvm_arm_pmu_v3_enable(struct kvm_vcpu *vcpu)
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{
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return 0;
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}
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#endif
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#endif
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