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| author | Marcelo Tosatti <mtosatti@redhat.com> | 2009-12-23 14:35:21 -0200 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2010-03-01 12:35:44 -0300 |
| commit | bc6678a33d9b952981a8e44a4f876c3ad64ca4d8 (patch) | |
| tree | e26027179eb0d76f234509145a395dd6e5910074 /virt/kvm/assigned-dev.c | |
| parent | 3ad26d8139a82b0510b1e0435ee82ae461d33401 (diff) | |
| download | linux-bc6678a33d9b952981a8e44a4f876c3ad64ca4d8.tar.bz2 | |
KVM: introduce kvm->srcu and convert kvm_set_memory_region to SRCU update
Use two steps for memslot deletion: mark the slot invalid (which stops
instantiation of new shadow pages for that slot, but allows destruction),
then instantiate the new empty slot.
Also simplifies kvm_handle_hva locking.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'virt/kvm/assigned-dev.c')
| -rw-r--r-- | virt/kvm/assigned-dev.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/virt/kvm/assigned-dev.c b/virt/kvm/assigned-dev.c index f73de631e3ee..f51e684dd238 100644 --- a/virt/kvm/assigned-dev.c +++ b/virt/kvm/assigned-dev.c @@ -504,12 +504,12 @@ out: static int kvm_vm_ioctl_assign_device(struct kvm *kvm, struct kvm_assigned_pci_dev *assigned_dev) { - int r = 0; + int r = 0, idx; struct kvm_assigned_dev_kernel *match; struct pci_dev *dev; mutex_lock(&kvm->lock); - down_read(&kvm->slots_lock); + idx = srcu_read_lock(&kvm->srcu); match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, assigned_dev->assigned_dev_id); @@ -573,7 +573,7 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm, } out: - up_read(&kvm->slots_lock); + srcu_read_unlock(&kvm->srcu, idx); mutex_unlock(&kvm->lock); return r; out_list_del: @@ -585,7 +585,7 @@ out_put: pci_dev_put(dev); out_free: kfree(match); - up_read(&kvm->slots_lock); + srcu_read_unlock(&kvm->srcu, idx); mutex_unlock(&kvm->lock); return r; } |