> -----Original Message-----
> From: Duan, Zhenzhong <zhenzhong.duan@intel.com>
> Sent: Friday, March 27, 2026 10:52 AM
> To: qemu-devel@nongnu.org
> Cc: alex@shazbot.org; clg@redhat.com; eric.auger@redhat.com;
> mst@redhat.com; jasowang@redhat.com; jgg@nvidia.com;
> nicolinc@nvidia.com; skolothumtho@nvidia.com;
> joao.m.martins@oracle.com; clement.mathieu--drif@bull.com; Tian, Kevin
> <kevin.tian@intel.com>; Liu, Yi L <yi.l.liu@intel.com>; Hao, Xudong
> <xudong.hao@intel.com>; Duan, Zhenzhong <zhenzhong.duan@intel.com>
> Subject: [PATCH 0/5] intel_iommu: Enable PRQ support for passthrough
> device
> 
> Hi,
> 
> When svm=on,pasid=N,x-flst=on is configured for virtual vtd, we enable
> guest's support for vSVM. In this case, the host VTD may generate
> recoverable first stage page fault event, QEMU read the event and inject it to
> guest.
> 
> After guest handles the event, it sends a page group response, QEMU gets
> the response and pass it to host VTD.
> 
> This series adds QEMU support for receiving such host events through the
> FAULTQ interface and propagating them to the guest, then catching guest's
> responses and propagating them to host.
> 
> This patchset depends on pasid support:
> https://lore.kernel.org/qemu-devel/20260326091130.321483-1-
> zhenzhong.duan@intel.com/#t
> 
> GIT branch:
> https://github.com/yiliu1765/qemu/tree/zhenzhong/iommufd_prq
> 
> Tests:
> Tested with DSA wq attached to an user APP which triggers IO page fault on
> process page table durging DMA.
> 
> Thanks
> Zhenzhong
> 
> 
> Zhenzhong Duan (5):
>   backends/iommufd: Introduce iommufd_backend_alloc_faultq
>   backends/iommufd: Extend iommufd_backend_alloc_hwpt() with fault_id
>   intel_iommu_accel: Add PRQ injection for passthrough device
>   intel_iommu_accel: Accept PRQ response for passthrough device
>   intel_iommu_accel: teardown FAULTQ resources in bottom half
> 
>  hw/i386/intel_iommu_accel.h   |  16 +++
>  include/hw/i386/intel_iommu.h |   6 +
>  include/system/iommufd.h      |   7 +-
>  backends/iommufd.c            |  34 ++++-
>  hw/arm/smmuv3-accel.c         |   6 +-
>  hw/i386/intel_iommu.c         |   4 +
>  hw/i386/intel_iommu_accel.c   | 243
> +++++++++++++++++++++++++++++++++-
>  hw/vfio/iommufd.c             |   2 +-
>  backends/trace-events         |   3 +-
>  hw/i386/trace-events          |   2 +
>  10 files changed, 308 insertions(+), 15 deletions(-)
> 
> --
> 2.47.3

Tested-by: Xudong Hao <xudong.hao@intel.com>

DSA PF assignment to VM with vIOMMU scalable mode, userspace test tool dsa_test passed in VM. https://github.com/intel/idxd-config