[v9] intel_iommu: Enable first stage translation for passthrough device

[PATCH v9 17/19] intel_iommu: Add migration support with x-flts=on

Zhenzhong Duan posted 19 patches 5 hours ago

Diff against v6 v7 v8
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Maintainers: Yi Liu <yi.l.liu@intel.com>, Eric Auger <eric.auger@redhat.com>, Zhenzhong Duan <zhenzhong.duan@intel.com>, Paolo Bonzini <pbonzini@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, Eduardo Habkost <eduardo@habkost.net>, "Michael S. Tsirkin" <mst@redhat.com>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Jason Wang <jasowang@redhat.com>, "Clément Mathieu--Drif" <clement.mathieu--drif@eviden.com>, Alex Williamson <alex@shazbot.org>, "Cédric Le Goater" <clg@redhat.com>, Fabiano Rosas <farosas@suse.de>, Laurent Vivier <lvivier@redhat.com>

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[PATCH v9 17/19] intel_iommu: Add migration support with x-flts=on

Posted by Zhenzhong Duan 5 hours ago

When x-flts=on, we set up bindings to nested HWPT in host, after
migration, VFIO device binds to nesting parent HWPT by default.
We need to re-establish the bindings to nested HWPT, or else device
DMA will break.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
---
 hw/i386/intel_iommu.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 7e304e2988..7220a3d9f4 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -4090,6 +4090,13 @@ static int vtd_post_load(void *opaque, int version_id)
      */
     vtd_switch_address_space_all(iommu);
 
+    /*
+     * Bindings to nested HWPT in host is set up dynamically depending
+     * on pasid entry configuration from guest. After migration, we
+     * need to re-establish the bindings before restoring device's DMA.
+     */
+    vtd_replay_pasid_bindings_all(iommu);
+
     return 0;
 }
 
-- 
2.47.1