linux-kernel - Re: [PATCH 2/4] vfio: vfio_iommu_type1: Define VFIO_IOMMU_INFO

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Date:   Thu, 16 May 2019 16:57:42 +0200
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Pierre Morel <pmorel@...ux.ibm.com>, sebott@...ux.vnet.ibm.com,
        alex.williamson@...hat.com
Cc:     gerald.schaefer@...ibm.com, pasic@...ux.vnet.ibm.com,
        walling@...ux.ibm.com, linux-s390@...r.kernel.org,
        iommu@...ts.linux-foundation.org, joro@...tes.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        schwidefsky@...ibm.com, heiko.carstens@...ibm.com
Subject: Re: [PATCH 2/4] vfio: vfio_iommu_type1: Define
 VFIO_IOMMU_INFO_CAPABILITIES

Alex, 

patch 1 and 3 are s390 specific, 2 and 4 are vfio common code.
Are you ok with the common code changes? If yes, would you prefer to have this
via the s390 tree (Martin) or your tree?

On 10.05.19 10:22, Pierre Morel wrote:
> To use the VFIO_IOMMU_GET_INFO to retrieve IOMMU specific information,
> we define a new flag VFIO_IOMMU_INFO_CAPABILITIES in the
> vfio_iommu_type1_info structure and the associated capability
> information block.
> 
> Signed-off-by: Pierre Morel <pmorel@...ux.ibm.com>
> ---
>  include/uapi/linux/vfio.h | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
> index 8f10748..8f68e0f 100644
> --- a/include/uapi/linux/vfio.h
> +++ b/include/uapi/linux/vfio.h
> @@ -715,6 +715,16 @@ struct vfio_iommu_type1_info {
>  	__u32	flags;
>  #define VFIO_IOMMU_INFO_PGSIZES (1 << 0)	/* supported page sizes info */
>  	__u64	iova_pgsizes;		/* Bitmap of supported page sizes */
> +#define VFIO_IOMMU_INFO_CAPABILITIES (1 << 1)  /* support capabilities info */
> +	__u64   cap_offset;     /* Offset within info struct of first cap */
> +};
> +
> +#define VFIO_IOMMU_INFO_CAP_QFN		1
> +#define VFIO_IOMMU_INFO_CAP_QGRP	2
> +
> +struct vfio_iommu_type1_info_block {
> +	struct vfio_info_cap_header header;
> +	__u32 data[];
>  };
>  
>  #define VFIO_IOMMU_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12)
>