4.19-stable review patch. If anyone has any objections, please let me know.
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[ 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 julien.thierry@arm.com Acked-by: Christoffer Dall christoffer.dall@arm.com Acked-by: Marc Zyngier marc.zyngier@arm.com Signed-off-by: Christoffer Dall christoffer.dall@arm.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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 4f31f96bbfab..90ac450745f1 100644 --- a/include/kvm/arm_vgic.h +++ b/include/kvm/arm_vgic.h @@ -256,7 +256,7 @@ 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 c0c0b88af1d5..33e7ee814f7b 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); }
/* CREATION */ diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c index 12502251727e..f376c82afb61 100644 --- a/virt/kvm/arm/vgic/vgic-its.c +++ b/virt/kvm/arm/vgic/vgic-its.c @@ -73,7 +73,7 @@ static struct vgic_irq *vgic_add_lpi(struct kvm *kvm, u32 intid, irq->target_vcpu = vcpu; irq->group = 1;
- 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 @@ -101,7 +101,7 @@ 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. @@ -339,7 +339,7 @@ int vgic_copy_lpi_list(struct kvm *kvm, 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; @@ -348,7 +348,7 @@ int vgic_copy_lpi_list(struct kvm *kvm, 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 f884a54b2601..c5165e3b80cb 100644 --- a/virt/kvm/arm/vgic/vgic.c +++ b/virt/kvm/arm/vgic/vgic.c @@ -72,7 +72,7 @@ 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) @@ -88,7 +88,7 @@ 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; } @@ -138,15 +138,15 @@ 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); }