linux-kernel - Re: [PATCH RFC v1 09/15] iommu/virtio: Update table format probing header

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Date:   Wed, 3 Mar 2021 18:21:14 +0100
From:   Jean-Philippe Brucker <jean-philippe@...aro.org>
To:     Vivek Gautam <vivek.gautam@....com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org,
        virtualization@...ts.linux-foundation.org, joro@...tes.org,
        will.deacon@....com, mst@...hat.com, robin.murphy@....com,
        eric.auger@...hat.com, alex.williamson@...hat.com,
        kevin.tian@...el.com, jacob.jun.pan@...ux.intel.com,
        yi.l.liu@...el.com, lorenzo.pieralisi@....com,
        shameerali.kolothum.thodi@...wei.com
Subject: Re: [PATCH RFC v1 09/15] iommu/virtio: Update table format probing
 header

On Fri, Jan 15, 2021 at 05:43:36PM +0530, Vivek Gautam wrote:
> Add info about asid_bits and additional flags to table format
> probing header.
> 
> Signed-off-by: Vivek Gautam <vivek.gautam@....com>
> Cc: Joerg Roedel <joro@...tes.org>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Michael S. Tsirkin <mst@...hat.com>
> Cc: Robin Murphy <robin.murphy@....com>
> Cc: Jean-Philippe Brucker <jean-philippe@...aro.org>
> Cc: Eric Auger <eric.auger@...hat.com>
> Cc: Alex Williamson <alex.williamson@...hat.com>
> Cc: Kevin Tian <kevin.tian@...el.com>
> Cc: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Cc: Liu Yi L <yi.l.liu@...el.com>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> Cc: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
> ---
>  include/uapi/linux/virtio_iommu.h | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/include/uapi/linux/virtio_iommu.h b/include/uapi/linux/virtio_iommu.h
> index 43821e33e7af..8a0624bab4b2 100644
> --- a/include/uapi/linux/virtio_iommu.h
> +++ b/include/uapi/linux/virtio_iommu.h
> @@ -169,7 +169,10 @@ struct virtio_iommu_probe_pasid_size {
>  struct virtio_iommu_probe_table_format {
>  	struct virtio_iommu_probe_property	head;
>  	__le16					format;
> -	__u8					reserved[2];
> +	__le16					asid_bits;
> +
> +	__le32					flags;

This struct should only contain the head and format fields. asid and flags
should go in a specialized structure - virtio_iommu_probe_pgt_arm64 in the
latest spec draft, where I dropped the asid_bits field in favor of an
"ASID16" flag.

Thanks,
Jean