KVM: arm/arm64: vgic: Make vgic_cpu->ap_list_lock a raw_spinlock
vgic_cpu->ap_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>
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index 32954e1..c36c86f 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -307,7 +307,7 @@
unsigned int used_lrs;
struct vgic_irq private_irqs[VGIC_NR_PRIVATE_IRQS];
- spinlock_t ap_list_lock; /* Protects the ap_list */
+ raw_spinlock_t ap_list_lock; /* Protects the ap_list */
/*
* List of IRQs that this VCPU should consider because they are either
diff --git a/virt/kvm/arm/vgic/vgic-init.c b/virt/kvm/arm/vgic/vgic-init.c
index 330c1ad..dfbfcb1 100644
--- a/virt/kvm/arm/vgic/vgic-init.c
+++ b/virt/kvm/arm/vgic/vgic-init.c
@@ -206,7 +206,7 @@
vgic_cpu->sgi_iodev.base_addr = VGIC_ADDR_UNDEF;
INIT_LIST_HEAD(&vgic_cpu->ap_list_head);
- spin_lock_init(&vgic_cpu->ap_list_lock);
+ raw_spin_lock_init(&vgic_cpu->ap_list_lock);
/*
* Enable and configure all SGIs to be edge-triggered and
diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
index ea54a19..abd9c73 100644
--- a/virt/kvm/arm/vgic/vgic.c
+++ b/virt/kvm/arm/vgic/vgic.c
@@ -54,11 +54,11 @@
* When taking more than one ap_list_lock at the same time, always take the
* lowest numbered VCPU's ap_list_lock first, so:
* vcpuX->vcpu_id < vcpuY->vcpu_id:
- * spin_lock(vcpuX->arch.vgic_cpu.ap_list_lock);
- * spin_lock(vcpuY->arch.vgic_cpu.ap_list_lock);
+ * raw_spin_lock(vcpuX->arch.vgic_cpu.ap_list_lock);
+ * raw_spin_lock(vcpuY->arch.vgic_cpu.ap_list_lock);
*
* Since the VGIC must support injecting virtual interrupts from ISRs, we have
- * to use the spin_lock_irqsave/spin_unlock_irqrestore versions of outer
+ * to use the raw_spin_lock_irqsave/raw_spin_unlock_irqrestore versions of outer
* spinlocks for any lock that may be taken while injecting an interrupt.
*/
@@ -351,7 +351,7 @@
/* someone can do stuff here, which we re-check below */
- spin_lock_irqsave(&vcpu->arch.vgic_cpu.ap_list_lock, flags);
+ raw_spin_lock_irqsave(&vcpu->arch.vgic_cpu.ap_list_lock, flags);
raw_spin_lock(&irq->irq_lock);
/*
@@ -368,7 +368,8 @@
if (unlikely(irq->vcpu || vcpu != vgic_target_oracle(irq))) {
raw_spin_unlock(&irq->irq_lock);
- spin_unlock_irqrestore(&vcpu->arch.vgic_cpu.ap_list_lock, flags);
+ raw_spin_unlock_irqrestore(&vcpu->arch.vgic_cpu.ap_list_lock,
+ flags);
raw_spin_lock_irqsave(&irq->irq_lock, flags);
goto retry;
@@ -383,7 +384,7 @@
irq->vcpu = vcpu;
raw_spin_unlock(&irq->irq_lock);
- spin_unlock_irqrestore(&vcpu->arch.vgic_cpu.ap_list_lock, flags);
+ raw_spin_unlock_irqrestore(&vcpu->arch.vgic_cpu.ap_list_lock, flags);
kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
kvm_vcpu_kick(vcpu);
@@ -597,7 +598,7 @@
DEBUG_SPINLOCK_BUG_ON(!irqs_disabled());
retry:
- spin_lock(&vgic_cpu->ap_list_lock);
+ raw_spin_lock(&vgic_cpu->ap_list_lock);
list_for_each_entry_safe(irq, tmp, &vgic_cpu->ap_list_head, ap_list) {
struct kvm_vcpu *target_vcpu, *vcpuA, *vcpuB;
@@ -638,7 +639,7 @@
/* This interrupt looks like it has to be migrated. */
raw_spin_unlock(&irq->irq_lock);
- spin_unlock(&vgic_cpu->ap_list_lock);
+ raw_spin_unlock(&vgic_cpu->ap_list_lock);
/*
* Ensure locking order by always locking the smallest
@@ -652,9 +653,9 @@
vcpuB = vcpu;
}
- spin_lock(&vcpuA->arch.vgic_cpu.ap_list_lock);
- spin_lock_nested(&vcpuB->arch.vgic_cpu.ap_list_lock,
- SINGLE_DEPTH_NESTING);
+ raw_spin_lock(&vcpuA->arch.vgic_cpu.ap_list_lock);
+ raw_spin_lock_nested(&vcpuB->arch.vgic_cpu.ap_list_lock,
+ SINGLE_DEPTH_NESTING);
raw_spin_lock(&irq->irq_lock);
/*
@@ -676,8 +677,8 @@
}
raw_spin_unlock(&irq->irq_lock);
- spin_unlock(&vcpuB->arch.vgic_cpu.ap_list_lock);
- spin_unlock(&vcpuA->arch.vgic_cpu.ap_list_lock);
+ raw_spin_unlock(&vcpuB->arch.vgic_cpu.ap_list_lock);
+ raw_spin_unlock(&vcpuA->arch.vgic_cpu.ap_list_lock);
if (target_vcpu_needs_kick) {
kvm_make_request(KVM_REQ_IRQ_PENDING, target_vcpu);
@@ -687,7 +688,7 @@
goto retry;
}
- spin_unlock(&vgic_cpu->ap_list_lock);
+ raw_spin_unlock(&vgic_cpu->ap_list_lock);
}
static inline void vgic_fold_lr_state(struct kvm_vcpu *vcpu)
@@ -872,9 +873,9 @@
DEBUG_SPINLOCK_BUG_ON(!irqs_disabled());
- spin_lock(&vcpu->arch.vgic_cpu.ap_list_lock);
+ raw_spin_lock(&vcpu->arch.vgic_cpu.ap_list_lock);
vgic_flush_lr_state(vcpu);
- spin_unlock(&vcpu->arch.vgic_cpu.ap_list_lock);
+ raw_spin_unlock(&vcpu->arch.vgic_cpu.ap_list_lock);
if (can_access_vgic_from_kernel())
vgic_restore_state(vcpu);
@@ -918,7 +919,7 @@
vgic_get_vmcr(vcpu, &vmcr);
- spin_lock_irqsave(&vgic_cpu->ap_list_lock, flags);
+ raw_spin_lock_irqsave(&vgic_cpu->ap_list_lock, flags);
list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
raw_spin_lock(&irq->irq_lock);
@@ -931,7 +932,7 @@
break;
}
- spin_unlock_irqrestore(&vgic_cpu->ap_list_lock, flags);
+ raw_spin_unlock_irqrestore(&vgic_cpu->ap_list_lock, flags);
return pending;
}