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Diffstat (limited to 'virt/kvm/kvm_main.c')
-rw-r--r--virt/kvm/kvm_main.c43
1 files changed, 33 insertions, 10 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 3a5a08298aa..29a667ce35b 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -173,7 +173,6 @@ static void kvm_assigned_dev_interrupt_work_handler(struct work_struct *work)
assigned_dev->host_irq_disabled = false;
}
mutex_unlock(&assigned_dev->kvm->lock);
- kvm_put_kvm(assigned_dev->kvm);
}
static irqreturn_t kvm_assigned_dev_intr(int irq, void *dev_id)
@@ -181,8 +180,6 @@ static irqreturn_t kvm_assigned_dev_intr(int irq, void *dev_id)
struct kvm_assigned_dev_kernel *assigned_dev =
(struct kvm_assigned_dev_kernel *) dev_id;
- kvm_get_kvm(assigned_dev->kvm);
-
schedule_work(&assigned_dev->interrupt_work);
disable_irq_nosync(irq);
@@ -213,6 +210,7 @@ static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
}
}
+/* The function implicit hold kvm->lock mutex due to cancel_work_sync() */
static void kvm_free_assigned_irq(struct kvm *kvm,
struct kvm_assigned_dev_kernel *assigned_dev)
{
@@ -228,11 +226,24 @@ static void kvm_free_assigned_irq(struct kvm *kvm,
if (!assigned_dev->irq_requested_type)
return;
- if (cancel_work_sync(&assigned_dev->interrupt_work))
- /* We had pending work. That means we will have to take
- * care of kvm_put_kvm.
- */
- kvm_put_kvm(kvm);
+ /*
+ * In kvm_free_device_irq, cancel_work_sync return true if:
+ * 1. work is scheduled, and then cancelled.
+ * 2. work callback is executed.
+ *
+ * The first one ensured that the irq is disabled and no more events
+ * would happen. But for the second one, the irq may be enabled (e.g.
+ * for MSI). So we disable irq here to prevent further events.
+ *
+ * Notice this maybe result in nested disable if the interrupt type is
+ * INTx, but it's OK for we are going to free it.
+ *
+ * If this function is a part of VM destroy, please ensure that till
+ * now, the kvm state is still legal for probably we also have to wait
+ * interrupt_work done.
+ */
+ disable_irq_nosync(assigned_dev->host_irq);
+ cancel_work_sync(&assigned_dev->interrupt_work);
free_irq(assigned_dev->host_irq, (void *)assigned_dev);
@@ -285,8 +296,8 @@ static int assigned_device_update_intx(struct kvm *kvm,
if (irqchip_in_kernel(kvm)) {
if (!msi2intx &&
- adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI) {
- free_irq(adev->host_irq, (void *)kvm);
+ (adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI)) {
+ free_irq(adev->host_irq, (void *)adev);
pci_disable_msi(adev->dev);
}
@@ -455,6 +466,7 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
struct kvm_assigned_dev_kernel *match;
struct pci_dev *dev;
+ down_read(&kvm->slots_lock);
mutex_lock(&kvm->lock);
match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
@@ -516,6 +528,7 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
out:
mutex_unlock(&kvm->lock);
+ up_read(&kvm->slots_lock);
return r;
out_list_del:
list_del(&match->list);
@@ -527,6 +540,7 @@ out_put:
out_free:
kfree(match);
mutex_unlock(&kvm->lock);
+ up_read(&kvm->slots_lock);
return r;
}
#endif
@@ -789,11 +803,19 @@ static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
return young;
}
+static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
+ struct mm_struct *mm)
+{
+ struct kvm *kvm = mmu_notifier_to_kvm(mn);
+ kvm_arch_flush_shadow(kvm);
+}
+
static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
.invalidate_page = kvm_mmu_notifier_invalidate_page,
.invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
.invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
.clear_flush_young = kvm_mmu_notifier_clear_flush_young,
+ .release = kvm_mmu_notifier_release,
};
#endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
@@ -883,6 +905,7 @@ static void kvm_destroy_vm(struct kvm *kvm)
{
struct mm_struct *mm = kvm->mm;
+ kvm_arch_sync_events(kvm);
spin_lock(&kvm_lock);
list_del(&kvm->vm_list);
spin_unlock(&kvm_lock);