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/iommu.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) (limited to 'virt/kvm/iommu.c') diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c index e9693a29d00e..4c4037503600 100644 --- a/virt/kvm/iommu.c +++ b/virt/kvm/iommu.c @@ -73,14 +73,13 @@ static int kvm_iommu_map_memslots(struct kvm *kvm) { int i, r = 0; - down_read(&kvm->slots_lock); for (i = 0; i < kvm->nmemslots; i++) { r = kvm_iommu_map_pages(kvm, kvm->memslots[i].base_gfn, kvm->memslots[i].npages); if (r) break; } - up_read(&kvm->slots_lock); + return r; } @@ -190,12 +189,11 @@ static void kvm_iommu_put_pages(struct kvm *kvm, static int kvm_iommu_unmap_memslots(struct kvm *kvm) { int i; - down_read(&kvm->slots_lock); + for (i = 0; i < kvm->nmemslots; i++) { kvm_iommu_put_pages(kvm, kvm->memslots[i].base_gfn, kvm->memslots[i].npages); } - up_read(&kvm->slots_lock); return 0; } -- cgit v1.2.1