On 16/05/2017 18:51, Maxime Coquelin wrote: >> >> I faced the problem the old patch fixes when declaring and attaching >> an IOMMU device, but booting the kernel with intel_iommu=off. >> >> I tested again with patches 1 & 4 of your series, and I confirm it >> fixes the issue: >> Tested-by: Maxime Coquelin <maxime.coque...@redhat.com> > > I did some more testing with my "vhost-user IOMMU" setup, and the series > actually breaks with IOMMU device attached, and intel_iommu=on. > > The main difference with the previous passing test is the guest RAM > size. In the working setup, it is 2G of 2M hugepages, vs. 4G of 2M > hugepages in the failing one. Note that I also reproduce with > vhost-kernel backend. > > The error happens in the first vhost_device_iotlb_miss() call: > qemu-system-x86_64: Fail to lookup the translated address b5d7c000 > > I don't have the root cause yet, I'll keep you updated.
I suppose it is patch 4? Paolo
