From 682edb4c01e690c7c7cd772dbd6f4e0fd74dc572 Mon Sep 17 00:00:00 2001 From: Mark McLoughlin Date: Thu, 5 Feb 2009 18:23:46 +0000 Subject: KVM: Fix assigned devices circular locking dependency kvm->slots_lock is outer to kvm->lock, so take slots_lock in kvm_vm_ioctl_assign_device() before taking kvm->lock, rather than taking it in kvm_iommu_map_memslots(). Cc: stable@kernel.org Signed-off-by: Mark McLoughlin Acked-by: Marcelo Tosatti Signed-off-by: Avi Kivity --- virt/kvm/kvm_main.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'virt/kvm/kvm_main.c') diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index d9bbb20f230f..29a667ce35b0 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -466,6 +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, @@ -527,6 +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); @@ -538,6 +540,7 @@ out_put: out_free: kfree(match); mutex_unlock(&kvm->lock); + up_read(&kvm->slots_lock); return r; } #endif -- cgit v1.2.1