We used to set the default granule to 4KB but with VFIO assignment it makes more sense to use the actual host page size.
Indeed when hotplugging a VFIO device protected by a virtio-iommu on a 64kB/64kB host/guest config, we current get a qemu crash: "vfio: DMA mapping failed, unable to continue" This is due to the hot-attached VFIO device calling memory_region_iommu_set_page_size_mask() with 64kB granule whereas the virtio-iommu granule was already frozen to 4KB on machine init done. Introduce a new granule property and set this latter to "host" and introduce a new compat. Note that the new default will prevent 4kB guest on 64kB host because the granule will be set to 64kB which would be larger than the guest page size. In that situation, the virtio-iommu driver fails on viommu_domain_finalise() with "granule 0x10000 larger than system page size 0x1000". The current limitation of global granule in the virtio-iommu should be removed and turned into per domain granule. But until we get this upgraded, this new default is probably better because I don't think anyone is currently interested in running a 4KB page size guest with virtio-iommu on a 64KB host. However supporting 64kB guest on 64kB host with virtio-iommu and VFIO looks a more important feature. This series can be found at: https://github.com/eauger/qemu/tree/granule-v1 Previous version: [PATCH v2] virtio-iommu: Use qemu_real_host_page_mask as default page_size_mask https://lore.kernel.org/all/20240117132039.332273-1-eric.au...@redhat.com/ Applied on top of [PATCH v5 0/4] VIRTIO-IOMMU: Introduce an aw-bits option https://lore.kernel.org/all/20240215084315.863897-1-eric.au...@redhat.com/ History: v2 -> v3 - introduce a dedicated granule option to handle the compat Eric Auger (3): qdev: Add a granule_mode property virtio-iommu: Add a granule property virtio-iommu: Change the default granule to the host page size include/hw/qdev-properties-system.h | 3 +++ include/hw/virtio/virtio-iommu.h | 11 ++++++++++ hw/core/machine.c | 1 + hw/core/qdev-properties-system.c | 15 +++++++++++++ hw/virtio/virtio-iommu.c | 34 ++++++++++++++++++++++++++--- qemu-options.hx | 3 +++ 6 files changed, 64 insertions(+), 3 deletions(-) -- 2.41.0