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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 <markmc@redhat.com> Acked-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
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2 changed files with 5 additions and 4 deletions
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@ -73,14 +73,13 @@ static int kvm_iommu_map_memslots(struct kvm *kvm)
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{
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int i, r = 0;
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down_read(&kvm->slots_lock);
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for (i = 0; i < kvm->nmemslots; i++) {
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r = kvm_iommu_map_pages(kvm, kvm->memslots[i].base_gfn,
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kvm->memslots[i].npages);
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if (r)
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break;
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}
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up_read(&kvm->slots_lock);
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return r;
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}
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@ -190,12 +189,11 @@ static void kvm_iommu_put_pages(struct kvm *kvm,
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static int kvm_iommu_unmap_memslots(struct kvm *kvm)
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{
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int i;
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down_read(&kvm->slots_lock);
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for (i = 0; i < kvm->nmemslots; i++) {
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kvm_iommu_put_pages(kvm, kvm->memslots[i].base_gfn,
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kvm->memslots[i].npages);
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}
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up_read(&kvm->slots_lock);
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return 0;
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}
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@ -466,6 +466,7 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
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struct kvm_assigned_dev_kernel *match;
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struct pci_dev *dev;
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down_read(&kvm->slots_lock);
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mutex_lock(&kvm->lock);
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match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
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@ -527,6 +528,7 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
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out:
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mutex_unlock(&kvm->lock);
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up_read(&kvm->slots_lock);
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return r;
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out_list_del:
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list_del(&match->list);
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@ -538,6 +540,7 @@ out_put:
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out_free:
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kfree(match);
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mutex_unlock(&kvm->lock);
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up_read(&kvm->slots_lock);
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return r;
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}
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#endif
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