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vfio/iommu_type1: Fix some sanity checks in detach group
vfio_sanity_check_pfn_list() is used to check whether pfn_list and notifier are empty when remove the external domain, so it makes a wrong assumption that only external domain will use the pinning interface. Now we apply the pfn_list check when a vfio_dma is removed and apply the notifier check when all domains are removed. Fixes: a54eb55 ("vfio iommu type1: Add support for mediated devices") Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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