Re: [PATCH v2 1/3] vdpa: Skip protected ram IOMMU mappings

[Jason Wang]

On Tue, Oct 5, 2021 at 9:49 PM Eugenio Pérez <eperezma@redhat.com> wrote:
>
> Following the logic of commit 56918a126ae ("memory: Add RAM_PROTECTED
> flag to skip IOMMU mappings") with VFIO, skip memory sections
> inaccessible via normal mechanisms, including DMA.
>
> Signed-off-by: Eugenio Pérez <eperezma@redhat.com>

Acked-by: Jason Wang <jasowang@redhat.com>

> ---
>  hw/virtio/vhost-vdpa.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
> index 47d7a5a23d..ea1aa71ad8 100644
> --- a/hw/virtio/vhost-vdpa.c
> +++ b/hw/virtio/vhost-vdpa.c
> @@ -28,6 +28,7 @@ static bool 
> vhost_vdpa_listener_skipped_section(MemoryRegionSection *section)
>  {
>      return (!memory_region_is_ram(section->mr) &&
>              !memory_region_is_iommu(section->mr)) ||
> +            memory_region_is_protected(section->mr) ||
>             /* vhost-vDPA doesn't allow MMIO to be mapped  */
>              memory_region_is_ram_device(section->mr) ||
>             /*
> --
> 2.27.0
>