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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: Ralf Bonenkamp <ralf.bonenkamp@swyx.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Marcelo Tosatti 2010-04-23 14:03:38 -03:00
parent be835674b5
commit 46a47b1ed1
2 changed files with 16 additions and 16 deletions
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30
virt/kvm/ioapic.c
View File

@ -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;
}

2
virt/kvm/ioapic.h
View File

@ -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);
};