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Subject[PATCH 4.16 016/110] KVM: arm/arm64: VGIC/ITS: Promote irq_lock() in update_affinity
Date
4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andre Przywara <andre.przywara@arm.com>

commit 9c4188762f7fee032abf8451fd9865a9abfc5516 upstream.

Apparently the development of update_affinity() overlapped with the
promotion of irq_lock to be _irqsave, so the patch didn't convert this
lock over. This will make lockdep complain.

Fix this by disabling IRQs around the lock.

Cc: stable@vger.kernel.org
Fixes: 08c9fd042117 ("KVM: arm/arm64: vITS: Add a helper to update the affinity of an LPI")
Reported-by: Jan Glauber <jan.glauber@caviumnetworks.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
virt/kvm/arm/vgic/vgic-its.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -350,10 +350,11 @@ static int vgic_copy_lpi_list(struct kvm
static int update_affinity(struct vgic_irq *irq, struct kvm_vcpu *vcpu)
{
int ret = 0;
+ unsigned long flags;

- spin_lock(&irq->irq_lock);
+ spin_lock_irqsave(&irq->irq_lock, flags);
irq->target_vcpu = vcpu;
- spin_unlock(&irq->irq_lock);
+ spin_unlock_irqrestore(&irq->irq_lock, flags);

if (irq->hw) {
struct its_vlpi_map map;

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