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    Subject[PATCH v2 2/2] kvm: unpin guest and free iommu domain after deassign last device
    Date
    Unpin the guest and free the iommu domain if there are no longer
    any devices attached.

    Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
    ---

    virt/kvm/assigned-dev.c | 3 +++
    virt/kvm/iommu.c | 1 +
    2 files changed, 4 insertions(+), 0 deletions(-)

    diff --git a/virt/kvm/assigned-dev.c b/virt/kvm/assigned-dev.c
    index 01f572c..01e7c37 100644
    --- a/virt/kvm/assigned-dev.c
    +++ b/virt/kvm/assigned-dev.c
    @@ -765,6 +765,9 @@ static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,

    kvm_free_assigned_device(kvm, match);

    + if (list_empty(&kvm->arch.assigned_dev_head))
    + kvm_iommu_unmap_guest(kvm);
    +
    out:
    mutex_unlock(&kvm->lock);
    return r;
    diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c
    index fec1723..ee4c236 100644
    --- a/virt/kvm/iommu.c
    +++ b/virt/kvm/iommu.c
    @@ -342,5 +342,6 @@ int kvm_iommu_unmap_guest(struct kvm *kvm)

    kvm_iommu_unmap_memslots(kvm);
    iommu_domain_free(domain);
    + kvm->arch.iommu_domain = NULL;
    return 0;
    }


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