Re: [Qemu-devel] [PATCH 1/2] pseries: Don't allow TCE (iommu) tables to be registered with duplicate LIOBNs

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Nov 27, 2012 at 05:07:32PM +1100, David Gibson wrote:
> The PAPR specification requires that every bus or device mediated by the
> IOMMU have a unique Logical IO Bus Number (LIOBN).  This patch adds a check
> to enforce this, which will help catch errors in configuration earlier.
> 
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

Acked-by: Michael S. Tsirkin <mst@redhat.com>

> ---
>  hw/spapr_iommu.c |    6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/hw/spapr_iommu.c b/hw/spapr_iommu.c
> index 02d78cc..3011b25 100644
> --- a/hw/spapr_iommu.c
> +++ b/hw/spapr_iommu.c
> @@ -120,6 +120,12 @@ DMAContext *spapr_tce_new_dma_context(uint32_t liobn, size_t window_size)
>  {
>      sPAPRTCETable *tcet;
>  
> +    if (spapr_tce_find_by_liobn(liobn)) {
> +        fprintf(stderr, "Attempted to create TCE table with duplicate"
> +                " LIOBN 0x%x\n", liobn);
> +        return NULL;
> +    }
> +
>      if (!window_size) {
>          return NULL;
>      }
> -- 
> 1.7.10.4