Hi Peter, While vfio with virtio-iommu I observed one issue, When virtio-iommu device exists but guest kernel does not have virtio-iommu driver (not enabled in Config) then IOMMU faults are reported on host.
This is because no mapping is created in IOMMU, not even default guest-physical to real-physical. While looking at vfio_listener_region_add(), it does not create initial mapping in IOMMU and relies on guest to create mapping. Is this something known or I am missing something? Thanks -Bharat > -----Original Message----- > From: Bharat Bhushan [mailto:bharat.bhus...@nxp.com] > Sent: Wednesday, September 27, 2017 12:03 PM > To: eric.au...@redhat.com; eric.auger....@gmail.com; > peter.mayd...@linaro.org; alex.william...@redhat.com; m...@redhat.com; > qemu-...@nongnu.org; qemu-devel@nongnu.org > Cc: w...@redhat.com; kevin.t...@intel.com; marc.zyng...@arm.com; > t...@semihalf.com; will.dea...@arm.com; drjo...@redhat.com; > robin.mur...@arm.com; christoffer.d...@linaro.org; > bharatb.ya...@gmail.com; Bharat Bhushan <bharat.bhus...@nxp.com> > Subject: [PATCH v4 0/5] virtio-iommu: VFIO integration > > This patch series integrates VFIO/VHOST with virtio-iommu. > > This version is mainly about rebasing on v4 version on virtio-iommu device > framework from Eric Augur and addresing review comments. > > This patch series allows PCI pass-through using virtio-iommu. > > This series is based on: > - virtio-iommu kernel driver by Jean-Philippe Brucker > [1] [RFC] virtio-iommu version 0.4 > git://linux-arm.org/virtio-iommu.git branch viommu/v0.4 > > - virtio-iommu device emulation by Eric Augur. > [RFC v4 00/16] VIRTIO-IOMMU device > https://github.com/eauger/qemu/tree/v2.10.0-virtio-iommu-v4 > > Changes are available at : https://github.com/bharaty/qemu.git virtio- > iommu-vfio-integration-v4 > > v3->v4: > - Rebase to v4 version from Eric > - Fixes from Eric with DPDK in VM > - Logical division in multiple patches > > v2->v3: > - This series is based on "[RFC v3 0/8] VIRTIO-IOMMU device" > Which is based on top of v2.10-rc0 that > - Fixed issue with two PCI devices > - Addressed review comments > > v1->v2: > - Added trace events > - removed vSMMU3 link in patch description > > Bharat Bhushan (5): > target/arm/kvm: Translate the MSI doorbell in kvm_arch_fixup_msi_route > virtio-iommu: Add iommu notifier for map/unmap > virtio-iommu: Call iommu notifier for attach/detach > virtio-iommu: add iommu replay > virtio-iommu: add iommu notifier memory-region > > hw/virtio/trace-events | 5 ++ > hw/virtio/virtio-iommu.c | 181 > ++++++++++++++++++++++++++++++++++++++- > include/hw/virtio/virtio-iommu.h | 6 ++ > target/arm/kvm.c | 27 ++++++ > target/arm/trace-events | 3 + > 5 files changed, 219 insertions(+), 3 deletions(-) > > -- > 1.9.3
