Re: [PATCH v2] IOMMU not supported by vhost-user.

[Stefan Hajnoczi]

On Wed, Feb 17, 2021 at 04:55:12PM -0300, lagarcia@linux.ibm.com wrote:
> diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
> index 2fdd5daf74..6ab760364b 100644
> --- a/hw/virtio/vhost-user.c
> +++ b/hw/virtio/vhost-user.c
> @@ -1849,6 +1849,13 @@ static int vhost_user_backend_init(struct vhost_dev 
> *dev, void *opaque)
>              }
>          }
>  
> +        if ((dev->vdev != NULL) &&
> +            virtio_host_has_feature(dev->vdev, VIRTIO_F_IOMMU_PLATFORM) &&
> +            !(features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))) {
> +            error_report("IOMMU is currently not supported with vhost-user");

I think IOMMU *is* supported by vhost-user. It's just that specific
vhost-user backends might not implement it.

This error message can be made more specific:

  error_report("IOMMU is not supported by the connected vhost-user backend");

Stefan

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