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KVM: introduce kvm->srcu and convert kvm_set_memory_region to SRCU update

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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>
This commit is contained in:
Marcelo Tosatti
2009-12-23 14:35:21 -02:00
parent 3ad26d8139
commit bc6678a33d
8 changed files with 136 additions and 64 deletions
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8
virt/kvm/assigned-dev.c
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@@ -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;
}