[v2] Fix DMA failure when there is domain switch in guest

[PATCH v2 0/3] Fix DMA failure when there is domain switch in guest

Zhenzhong Duan posted 3 patches 4 weeks, 1 day ago

Diff against v3
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git fetch https://github.com/patchew-project/qemu tags/patchew/20251016074544.377637-1-zhenzhong.duan@intel.com

Maintainers: "Michael S. Tsirkin" <mst@redhat.com>, Jason Wang <jasowang@redhat.com>, Yi Liu <yi.l.liu@intel.com>, "Clément Mathieu--Drif" <clement.mathieu--drif@eviden.com>, Paolo Bonzini <pbonzini@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, Eduardo Habkost <eduardo@habkost.net>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>

There is a newer version of this series

hw/i386/intel_iommu_internal.h |  17 ++++
include/hw/i386/intel_iommu.h  |   6 ++
hw/i386/intel_iommu.c          | 173 +++++++++++++++++++++++++++++++--
hw/i386/trace-events           |   4 +
4 files changed, 190 insertions(+), 10 deletions(-)

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[PATCH v2 0/3] Fix DMA failure when there is domain switch in guest

Posted by Zhenzhong Duan 4 weeks, 1 day ago

Hi,

This fixes an DMA failure issue in guest when user switch domain
manually. E.g., echo [DMA|identity] > /sys/kernel/iommu_groups/6/type

First two patches come from [PATCH v6 00/22] intel_iommu: Enable first stage translation for passthrough device
which added basic support for pasid cache invalidation, the 3rd patch
add a fix.

Test:
both vhost network card and VFIO device,
guest config with and without iommu=pt,
switch domain with echo [DMA|identity] > /sys/kernel/iommu_groups/6/type,
ping test under different domain

Thanks
Zhenzhong

Changelog:
v2:
- drop extract64 usage in patch1 (Liuyi)
- update DID check logic (Liuyi)
- refactor comments (Liuyi)
- rewrite patch2 with simpler code
- bypass vtd_address_space_sync() when pasid entry is invalid

Zhenzhong Duan (3):
  intel_iommu: Handle PASID cache invalidation
  intel_iommu: Reset pasid cache when system level reset
  intel_iommu: Fix DMA failure when guest switches IOMMU domain

 hw/i386/intel_iommu_internal.h |  17 ++++
 include/hw/i386/intel_iommu.h  |   6 ++
 hw/i386/intel_iommu.c          | 173 +++++++++++++++++++++++++++++++--
 hw/i386/trace-events           |   4 +
 4 files changed, 190 insertions(+), 10 deletions(-)

-- 
2.47.1