linux-kernel - Re: [PATCH kernel v4 02/11] vfio/spapr: Relax the IOMMU compatibility check

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Message-ID: <20160429094146.4ed23f4b@t450s.home>
Date:	Fri, 29 Apr 2016 09:41:46 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	Alexey Kardashevskiy <aik@...abs.ru>
Cc:	linuxppc-dev@...ts.ozlabs.org,
	Alistair Popple <alistair@...ple.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Daniel Axtens <dja@...ens.net>,
	David Gibson <david@...son.dropbear.id.au>,
	Gavin Shan <gwshan@...ux.vnet.ibm.com>,
	Russell Currey <ruscur@...sell.cc>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH kernel v4 02/11] vfio/spapr: Relax the IOMMU
 compatibility check

On Fri, 29 Apr 2016 18:55:15 +1000
Alexey Kardashevskiy <aik@...abs.ru> wrote:

> We are going to have multiple different types of PHB on the same system
> with POWER8 + NVLink and PHBs will have different IOMMU ops. However
> we only really care about one callback - create_table - so we can
> relax the compatibility check here.
> 
> Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
> Reviewed-by: David Gibson <david@...son.dropbear.id.au>
> ---
>  drivers/vfio/vfio_iommu_spapr_tce.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c
> index 0582b72..3054e3f 100644
> --- a/drivers/vfio/vfio_iommu_spapr_tce.c
> +++ b/drivers/vfio/vfio_iommu_spapr_tce.c
> @@ -1188,7 +1188,8 @@ static int tce_iommu_attach_group(void *iommu_data,
>  			goto unlock_exit;
>  		}
>  		table_group_tmp = iommu_group_get_iommudata(tcegrp->grp);
> -		if (table_group_tmp->ops != table_group->ops) {
> +		if (table_group_tmp->ops->create_table !=
> +				table_group->ops->create_table) {
>  			pr_warn("tce_vfio: Group %d is incompatible with group %d\n",
>  					iommu_group_id(iommu_group),
>  					iommu_group_id(tcegrp->grp));

Acked-by: Alex Williamson <alex.williamson@...hat.com>