Re: [PATCH v7 2/6] vfio/type1: Check reserve region conflict and update iova list

[Alex Williamson]

On Wed, 26 Jun 2019 16:12:44 +0100
Shameer Kolothum <shameerali.kolothum.thodi@xxxxxxxxxx> wrote:

> This retrieves the reserved regions associated with dev group and
> checks for conflicts with any existing dma mappings. Also update
> the iova list excluding the reserved regions.
> 
> Reserved regions with type IOMMU_RESV_DIRECT_RELAXABLE are
> excluded from above checks as they are considered as directly
> mapped regions which are known to be relaxable.
> 
> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@xxxxxxxxxx>
> ---
>  drivers/vfio/vfio_iommu_type1.c | 96 +++++++++++++++++++++++++++++++++
>  1 file changed, 96 insertions(+)
> 
> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
> index 970d1ec06aed..b6bfdfa16c33 100644
> --- a/drivers/vfio/vfio_iommu_type1.c
> +++ b/drivers/vfio/vfio_iommu_type1.c
> @@ -1559,6 +1641,7 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
>  	phys_addr_t resv_msi_base;
>  	struct iommu_domain_geometry geo;
>  	LIST_HEAD(iova_copy);
> +	LIST_HEAD(group_resv_regions);
>  
>  	mutex_lock(&iommu->lock);
>  
> @@ -1644,6 +1727,13 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
>  		goto out_detach;
>  	}
>  
> +	iommu_get_group_resv_regions(iommu_group, &group_resv_regions);

This can fail and should have an error case.  I assume we'd fail the
group attach on failure.  Thanks,

Alex