Re: [PATCH] virtio-iommu: Fix migration regression

[Eric Auger]

Hi,

On 6/24/22 11:37, Zhenzhong Duan wrote:
> We also need to switch to the right address space on dest side
> after loading the device status. DMA to wrong address space is
> destructive.
>
> Fixes: 3facd774962fd ("virtio-iommu: Add bypass mode support to assigned 
> device")
> Suggested-by: Eric Auger <eric.auger@redhat.com>
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>

Eric
> ---
>  hw/virtio/virtio-iommu.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c
> index 08b227e828f8..281152d338f4 100644
> --- a/hw/virtio/virtio-iommu.c
> +++ b/hw/virtio/virtio-iommu.c
> @@ -1322,6 +1322,14 @@ static int iommu_post_load(void *opaque, int 
> version_id)
>      VirtIOIOMMU *s = opaque;
>  
>      g_tree_foreach(s->domains, reconstruct_endpoints, s);
> +
> +    /*
> +     * Memory regions are dynamically turned on/off depending on
> +     * 'config.bypass' and attached domain type if there is. After
> +     * migration, we need to make sure the memory regions are
> +     * still correct.
> +     */
> +    virtio_iommu_switch_address_space_all(s);
>      return 0;
>  }
>