Commit 46a47b1e authored by Marcelo Tosatti's avatar Marcelo Tosatti
Browse files

KVM: convert ioapic lock to spinlock 



kvm_set_irq is used from non sleepable contexes, so convert ioapic from
mutex to spinlock.

KVM-Stable-Tag.
Tested-by: default avatarRalf Bonenkamp <ralf.bonenkamp@swyx.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent be835674

virt/kvm/ioapic.c

+15 −15
Original line number Diff line number Diff line
@@ -197,7 +197,7 @@ int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level) 
	union kvm_ioapic_redirect_entry entry;

	int ret = 1;



	mutex_lock(&ioapic->lock);

	spin_lock(&ioapic->lock);

	if (irq >= 0 && irq < IOAPIC_NUM_PINS) {

		entry = ioapic->redirtbl[irq];

		level ^= entry.fields.polarity;
@@ -214,7 +214,7 @@ int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level) 
		}

		trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0);

	}

	mutex_unlock(&ioapic->lock);

	spin_unlock(&ioapic->lock);



	return ret;

}
@@ -238,9 +238,9 @@ static void __kvm_ioapic_update_eoi(struct kvm_ioapic *ioapic, int vector, 
		 * is dropped it will be put into irr and will be delivered

		 * after ack notifier returns.

		 */

		mutex_unlock(&ioapic->lock);

		spin_unlock(&ioapic->lock);

		kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, i);

		mutex_lock(&ioapic->lock);

		spin_lock(&ioapic->lock);



		if (trigger_mode != IOAPIC_LEVEL_TRIG)

			continue;
@@ -259,9 +259,9 @@ void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode) 
	smp_rmb();

	if (!test_bit(vector, ioapic->handled_vectors))

		return;

	mutex_lock(&ioapic->lock);

	spin_lock(&ioapic->lock);

	__kvm_ioapic_update_eoi(ioapic, vector, trigger_mode);

	mutex_unlock(&ioapic->lock);

	spin_unlock(&ioapic->lock);

}



static inline struct kvm_ioapic *to_ioapic(struct kvm_io_device *dev)
@@ -287,7 +287,7 @@ static int ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len, 
	ASSERT(!(addr & 0xf));	/* check alignment */



	addr &= 0xff;

	mutex_lock(&ioapic->lock);

	spin_lock(&ioapic->lock);

	switch (addr) {

	case IOAPIC_REG_SELECT:

		result = ioapic->ioregsel;
@@ -301,7 +301,7 @@ static int ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len, 
		result = 0;

		break;

	}

	mutex_unlock(&ioapic->lock);

	spin_unlock(&ioapic->lock);



	switch (len) {

	case 8:
@@ -338,7 +338,7 @@ static int ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len, 
	}



	addr &= 0xff;

	mutex_lock(&ioapic->lock);

	spin_lock(&ioapic->lock);

	switch (addr) {

	case IOAPIC_REG_SELECT:

		ioapic->ioregsel = data;
@@ -356,7 +356,7 @@ static int ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len, 
	default:

		break;

	}

	mutex_unlock(&ioapic->lock);

	spin_unlock(&ioapic->lock);

	return 0;

}
@@ -386,7 +386,7 @@ int kvm_ioapic_init(struct kvm *kvm) 
	ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL);

	if (!ioapic)

		return -ENOMEM;

	mutex_init(&ioapic->lock);

	spin_lock_init(&ioapic->lock);

	kvm->arch.vioapic = ioapic;

	kvm_ioapic_reset(ioapic);

	kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops);
@@ -419,9 +419,9 @@ int kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state) 
	if (!ioapic)

		return -EINVAL;



	mutex_lock(&ioapic->lock);

	spin_lock(&ioapic->lock);

	memcpy(state, ioapic, sizeof(struct kvm_ioapic_state));

	mutex_unlock(&ioapic->lock);

	spin_unlock(&ioapic->lock);

	return 0;

}
@@ -431,9 +431,9 @@ int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state) 
	if (!ioapic)

		return -EINVAL;



	mutex_lock(&ioapic->lock);

	spin_lock(&ioapic->lock);

	memcpy(ioapic, state, sizeof(struct kvm_ioapic_state));

	update_handled_vectors(ioapic);

	mutex_unlock(&ioapic->lock);

	spin_unlock(&ioapic->lock);

	return 0;

}

virt/kvm/ioapic.h

+1 −1
Original line number Diff line number Diff line
@@ -45,7 +45,7 @@ struct kvm_ioapic { 
	struct kvm_io_device dev;

	struct kvm *kvm;

	void (*ack_notifier)(void *opaque, int irq);

	struct mutex lock;

	spinlock_t lock;

	DECLARE_BITMAP(handled_vectors, 256);

};