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From 8d45902b4884315ec090e607e9f03606b21001cf Mon Sep 17 00:00:00 2001
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From: Zhenzhong Duan <zhenzhong.duan@intel.com>
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Date: Fri, 24 Jun 2022 17:37:40 +0800
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Subject: [PATCH 05/17] virtio-iommu: Fix migration regression
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RH-Author: Eric Auger <eric.auger@redhat.com>
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RH-MergeRequest: 105: virtio-iommu: Fix bypass mode for assigned devices
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RH-Commit: [5/5] 9652c4aaaf88e24083fab1fbc3d1423260c93ca6 (eauger1/centos-qemu-kvm)
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RH-Bugzilla: 2100106
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Peter Xu <peterx@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2100106
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We also need to switch to the right address space on dest side
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after loading the device status. DMA to wrong address space is
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destructive.
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Fixes: 3facd774962fd ("virtio-iommu: Add bypass mode support to assigned device")
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Suggested-by: Eric Auger <eric.auger@redhat.com>
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Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
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Message-Id: <20220624093740.3525267-1-zhenzhong.duan@intel.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Reviewed-by: Eric Auger <eric.auger@redhat.com>
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(cherry picked from commit d355566bd958e24e7e384da6ea89a9fc88d7bfed)
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Signed-off-by: Eric Auger <eric.auger@redhat.com>
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---
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hw/virtio/virtio-iommu.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c
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index 44a041dec9..2012835554 100644
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--- a/hw/virtio/virtio-iommu.c
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+++ b/hw/virtio/virtio-iommu.c
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@@ -1324,6 +1324,14 @@ static int iommu_post_load(void *opaque, int version_id)
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VirtIOIOMMU *s = opaque;
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g_tree_foreach(s->domains, reconstruct_endpoints, s);
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+
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+ /*
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+ * Memory regions are dynamically turned on/off depending on
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+ * 'config.bypass' and attached domain type if there is. After
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+ * migration, we need to make sure the memory regions are
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+ * still correct.
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+ */
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+ virtio_iommu_switch_address_space_all(s);
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return 0;
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}
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--
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2.31.1
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