From 50f82406b06f6cbc1b7681d89f904bc02472df51 Mon Sep 17 00:00:00 2001 From: Julien Thierry Date: Mon, 7 Jan 2019 15:06:16 +0000 Subject: [PATCH] KVM: arm/arm64: vgic: Make vgic_dist->lpi_list_lock a raw_spinlock BugLink: https://bugs.launchpad.net/bugs/1837952 [ Upstream commit fc3bc475231e12e9c0142f60100cf84d077c79e1 ] vgic_dist->lpi_list_lock must always be taken with interrupts disabled as it is used in interrupt context. For configurations such as PREEMPT_RT_FULL, this means that it should be a raw_spinlock since RT spinlocks are interruptible. Signed-off-by: Julien Thierry Acked-by: Christoffer Dall Acked-by: Marc Zyngier Signed-off-by: Christoffer Dall Signed-off-by: Sasha Levin Signed-off-by: Kamal Mostafa Signed-off-by: Khalid Elmously --- include/kvm/arm_vgic.h | 2 +- virt/kvm/arm/vgic/vgic-init.c | 2 +- virt/kvm/arm/vgic/vgic-its.c | 8 ++++---- virt/kvm/arm/vgic/vgic.c | 10 +++++----- 4 files changed, 11 insertions(+), 11 deletions(-) diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h index ff58c2933fdf..06ef8ead1f27 100644 --- a/include/kvm/arm_vgic.h +++ b/include/kvm/arm_vgic.h @@ -232,7 +232,7 @@ struct vgic_dist { u64 propbaser; /* Protects the lpi_list and the count value below. */ - spinlock_t lpi_list_lock; + raw_spinlock_t lpi_list_lock; struct list_head lpi_list_head; int lpi_list_count; diff --git a/virt/kvm/arm/vgic/vgic-init.c b/virt/kvm/arm/vgic/vgic-init.c index 094b781f5a46..7abd9dfd037e 100644 --- a/virt/kvm/arm/vgic/vgic-init.c +++ b/virt/kvm/arm/vgic/vgic-init.c @@ -64,7 +64,7 @@ void kvm_vgic_early_init(struct kvm *kvm) struct vgic_dist *dist = &kvm->arch.vgic; INIT_LIST_HEAD(&dist->lpi_list_head); - spin_lock_init(&dist->lpi_list_lock); + raw_spin_lock_init(&dist->lpi_list_lock); } /** diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c index 836428fd1c7e..36a5a5fc42ce 100644 --- a/virt/kvm/arm/vgic/vgic-its.c +++ b/virt/kvm/arm/vgic/vgic-its.c @@ -72,7 +72,7 @@ static struct vgic_irq *vgic_add_lpi(struct kvm *kvm, u32 intid, irq->intid = intid; irq->target_vcpu = vcpu; - spin_lock_irqsave(&dist->lpi_list_lock, flags); + raw_spin_lock_irqsave(&dist->lpi_list_lock, flags); /* * There could be a race with another vgic_add_lpi(), so we need to @@ -100,7 +100,7 @@ static struct vgic_irq *vgic_add_lpi(struct kvm *kvm, u32 intid, dist->lpi_list_count++; out_unlock: - spin_unlock_irqrestore(&dist->lpi_list_lock, flags); + raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags); /* * We "cache" the configuration table entries in our struct vgic_irq's. @@ -332,7 +332,7 @@ static int vgic_copy_lpi_list(struct kvm_vcpu *vcpu, u32 **intid_ptr) if (!intids) return -ENOMEM; - spin_lock_irqsave(&dist->lpi_list_lock, flags); + raw_spin_lock_irqsave(&dist->lpi_list_lock, flags); list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) { if (i == irq_count) break; @@ -341,7 +341,7 @@ static int vgic_copy_lpi_list(struct kvm_vcpu *vcpu, u32 **intid_ptr) continue; intids[i++] = irq->intid; } - spin_unlock_irqrestore(&dist->lpi_list_lock, flags); + raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags); *intid_ptr = intids; return i; diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c index b75a6566f626..de4225b13769 100644 --- a/virt/kvm/arm/vgic/vgic.c +++ b/virt/kvm/arm/vgic/vgic.c @@ -76,7 +76,7 @@ static struct vgic_irq *vgic_get_lpi(struct kvm *kvm, u32 intid) struct vgic_irq *irq = NULL; unsigned long flags; - spin_lock_irqsave(&dist->lpi_list_lock, flags); + raw_spin_lock_irqsave(&dist->lpi_list_lock, flags); list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) { if (irq->intid != intid) @@ -92,7 +92,7 @@ static struct vgic_irq *vgic_get_lpi(struct kvm *kvm, u32 intid) irq = NULL; out_unlock: - spin_unlock_irqrestore(&dist->lpi_list_lock, flags); + raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags); return irq; } @@ -142,15 +142,15 @@ void vgic_put_irq(struct kvm *kvm, struct vgic_irq *irq) if (irq->intid < VGIC_MIN_LPI) return; - spin_lock_irqsave(&dist->lpi_list_lock, flags); + raw_spin_lock_irqsave(&dist->lpi_list_lock, flags); if (!kref_put(&irq->refcount, vgic_irq_release)) { - spin_unlock_irqrestore(&dist->lpi_list_lock, flags); + raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags); return; }; list_del(&irq->lpi_list); dist->lpi_list_count--; - spin_unlock_irqrestore(&dist->lpi_list_lock, flags); + raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags); kfree(irq); } -- 2.39.5