3 files changed, 8 insertions, 1 deletions

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 19240feefe6f..0c71688b1ee3 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -124,7 +124,6 @@ struct kvm_kernel_irq_routing_entry {
 };
 
 struct kvm {
-        struct mutex lock; /* protects the vcpus array and APIC accesses */
         spinlock_t mmu_lock;
         spinlock_t requests_lock;
         struct rw_semaphore slots_lock;
@@ -134,6 +133,7 @@ struct kvm {
                                         KVM_PRIVATE_MEM_SLOTS];
         struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
         struct list_head vm_list;
+        struct mutex lock;
         struct kvm_io_bus mmio_bus;
         struct kvm_io_bus pio_bus;
 #ifdef CONFIG_HAVE_KVM_EVENTFD
@@ -150,6 +150,7 @@ struct kvm {
         struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
 #endif
 
+        struct mutex irq_lock;
 #ifdef CONFIG_HAVE_KVM_IRQCHIP
         struct list_head irq_routing; /* of kvm_kernel_irq_routing_entry */
         struct hlist_head mask_notifier_list;
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index 469b9faae665..2a5667173995 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -243,6 +243,7 @@ static void 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;
         switch (addr) {
         case IOAPIC_REG_SELECT:
@@ -269,6 +270,7 @@ static void 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);
 }
 
 static void ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
@@ -280,6 +282,8 @@ static void ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
         ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n",
                      (void*)addr, len, val);
         ASSERT(!(addr & 0xf));  /* check alignment */
+
+        mutex_lock(&ioapic->kvm->irq_lock);
         if (len == 4 || len == 8)
                 data = *(u32 *) val;
         else {
@@ -305,6 +309,7 @@ static void ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
         default:
                 break;
         }
+        mutex_unlock(&ioapic->kvm->irq_lock);
 }
 
 void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index d1f9c87daa87..d47e660fb709 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -982,6 +982,7 @@ static struct kvm *kvm_create_vm(void)
         kvm_io_bus_init(&kvm->pio_bus);
         kvm_irqfd_init(kvm);
         mutex_init(&kvm->lock);
+        mutex_init(&kvm->irq_lock);
         kvm_io_bus_init(&kvm->mmio_bus);
         init_rwsem(&kvm->slots_lock);
         atomic_set(&kvm->users_count, 1);