Hi All: According to ATS, device should work if ATS is disabled. This is not correctly implemented in the current intel-iommu since it doesn't handle the UNMAP notifier correctly. This breaks the vhost-net + vIOMMU without dt.
The root casue is that the when there's a device IOTLB miss (note that it's not specific to PCI so it can work without ATS), Qemu doesn't build the IOVA tree, so when guest start an IOTLB invalidation, Qemu won't trigger the UNMAP notifier. Fixing by build IOVA tree during IOMMU translsation. Thanks Jason Wang (3): intel-iommu: fail MAP notifier without caching mode intel-iommu: fail DEVIOTLB_UNMAP without dt mode intel-iommu: build iova tree during IOMMU translation hw/i386/intel_iommu.c | 58 ++++++++++++++++++++++++------------------- 1 file changed, 33 insertions(+), 25 deletions(-) -- 2.25.1
