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authorGleb Natapov <gleb@redhat.com>2009-08-24 11:54:25 +0300
committerAvi Kivity <avi@redhat.com>2009-12-03 09:32:08 +0200
commiteba0226bdfffe262e72b8360e4d0d12070e9a0f0 (patch)
tree93da785e3bba63a9232e529a2572541ef87c0615 /virt/kvm/ioapic.c
parent280aa177dcd1edc718d8a92f17f235b783ec6307 (diff)
downloadlinux-linaro-stable-eba0226bdfffe262e72b8360e4d0d12070e9a0f0.tar.gz
KVM: Move IO APIC to its own lock
The allows removal of irq_lock from the injection path. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'virt/kvm/ioapic.c')
-rw-r--r--virt/kvm/ioapic.c80
1 files changed, 61 insertions, 19 deletions
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index 9fe140bb38ec..38a2d20b89de 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -182,6 +182,7 @@ 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);
if (irq >= 0 && irq < IOAPIC_NUM_PINS) {
entry = ioapic->redirtbl[irq];
level ^= entry.fields.polarity;
@@ -198,34 +199,51 @@ 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);
+
return ret;
}
-static void __kvm_ioapic_update_eoi(struct kvm_ioapic *ioapic, int pin,
- int trigger_mode)
+static void __kvm_ioapic_update_eoi(struct kvm_ioapic *ioapic, int vector,
+ int trigger_mode)
{
- union kvm_ioapic_redirect_entry *ent;
+ int i;
+
+ for (i = 0; i < IOAPIC_NUM_PINS; i++) {
+ union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i];
- ent = &ioapic->redirtbl[pin];
+ if (ent->fields.vector != vector)
+ continue;
- kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, pin);
+ /*
+ * We are dropping lock while calling ack notifiers because ack
+ * notifier callbacks for assigned devices call into IOAPIC
+ * recursively. Since remote_irr is cleared only after call
+ * to notifiers if the same vector will be delivered while lock
+ * is dropped it will be put into irr and will be delivered
+ * after ack notifier returns.
+ */
+ mutex_unlock(&ioapic->lock);
+ kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, i);
+ mutex_lock(&ioapic->lock);
+
+ if (trigger_mode != IOAPIC_LEVEL_TRIG)
+ continue;
- if (trigger_mode == IOAPIC_LEVEL_TRIG) {
ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
ent->fields.remote_irr = 0;
- if (!ent->fields.mask && (ioapic->irr & (1 << pin)))
- ioapic_service(ioapic, pin);
+ if (!ent->fields.mask && (ioapic->irr & (1 << i)))
+ ioapic_service(ioapic, i);
}
}
void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode)
{
struct kvm_ioapic *ioapic = kvm->arch.vioapic;
- int i;
- for (i = 0; i < IOAPIC_NUM_PINS; i++)
- if (ioapic->redirtbl[i].fields.vector == vector)
- __kvm_ioapic_update_eoi(ioapic, i, trigger_mode);
+ mutex_lock(&ioapic->lock);
+ __kvm_ioapic_update_eoi(ioapic, vector, trigger_mode);
+ mutex_unlock(&ioapic->lock);
}
static inline struct kvm_ioapic *to_ioapic(struct kvm_io_device *dev)
@@ -250,8 +268,8 @@ static int ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
ioapic_debug("addr %lx\n", (unsigned long)addr);
ASSERT(!(addr & 0xf)); /* check alignment */
- mutex_lock(&ioapic->kvm->irq_lock);
addr &= 0xff;
+ mutex_lock(&ioapic->lock);
switch (addr) {
case IOAPIC_REG_SELECT:
result = ioapic->ioregsel;
@@ -265,6 +283,8 @@ static int ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
result = 0;
break;
}
+ mutex_unlock(&ioapic->lock);
+
switch (len) {
case 8:
*(u64 *) val = result;
@@ -277,7 +297,6 @@ static int ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
default:
printk(KERN_WARNING "ioapic: wrong length %d\n", len);
}
- mutex_unlock(&ioapic->kvm->irq_lock);
return 0;
}
@@ -293,15 +312,15 @@ static int ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
(void*)addr, len, val);
ASSERT(!(addr & 0xf)); /* check alignment */
- mutex_lock(&ioapic->kvm->irq_lock);
if (len == 4 || len == 8)
data = *(u32 *) val;
else {
printk(KERN_WARNING "ioapic: Unsupported size %d\n", len);
- goto unlock;
+ return 0;
}
addr &= 0xff;
+ mutex_lock(&ioapic->lock);
switch (addr) {
case IOAPIC_REG_SELECT:
ioapic->ioregsel = data;
@@ -312,15 +331,14 @@ static int ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
break;
#ifdef CONFIG_IA64
case IOAPIC_REG_EOI:
- kvm_ioapic_update_eoi(ioapic->kvm, data, IOAPIC_LEVEL_TRIG);
+ __kvm_ioapic_update_eoi(ioapic, data, IOAPIC_LEVEL_TRIG);
break;
#endif
default:
break;
}
-unlock:
- mutex_unlock(&ioapic->kvm->irq_lock);
+ mutex_unlock(&ioapic->lock);
return 0;
}
@@ -349,6 +367,7 @@ int kvm_ioapic_init(struct kvm *kvm)
ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL);
if (!ioapic)
return -ENOMEM;
+ mutex_init(&ioapic->lock);
kvm->arch.vioapic = ioapic;
kvm_ioapic_reset(ioapic);
kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops);
@@ -360,3 +379,26 @@ int kvm_ioapic_init(struct kvm *kvm)
return ret;
}
+int kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
+{
+ struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
+ if (!ioapic)
+ return -EINVAL;
+
+ mutex_lock(&ioapic->lock);
+ memcpy(state, ioapic, sizeof(struct kvm_ioapic_state));
+ mutex_unlock(&ioapic->lock);
+ return 0;
+}
+
+int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
+{
+ struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
+ if (!ioapic)
+ return -EINVAL;
+
+ mutex_lock(&ioapic->lock);
+ memcpy(ioapic, state, sizeof(struct kvm_ioapic_state));
+ mutex_unlock(&ioapic->lock);
+ return 0;
+}