linux-kernel - Re: [PATCH 3/4] vfio: use __aligned_u64 in struct vfio_iommu_type1

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Date:   Thu, 10 Aug 2023 10:25:35 -0400
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>
Cc:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Alex Williamson <alex.williamson@...hat.com>
Subject: Re: [PATCH 3/4] vfio: use __aligned_u64 in struct
 vfio_iommu_type1_info

On Thu, Aug 10, 2023 at 03:25:37AM +0000, Tian, Kevin wrote:
> > From: Stefan Hajnoczi <stefanha@...hat.com>
> > Sent: Thursday, August 10, 2023 5:03 AM
> >
> > @@ -1303,8 +1303,9 @@ struct vfio_iommu_type1_info {
> >  	__u32	flags;
> >  #define VFIO_IOMMU_INFO_PGSIZES (1 << 0)	/* supported page sizes info
> > */
> >  #define VFIO_IOMMU_INFO_CAPS	(1 << 1)	/* Info supports caps */
> > -	__u64	iova_pgsizes;	/* Bitmap of supported page sizes */
> > +	__aligned_u64	iova_pgsizes;		/* Bitmap of supported page
> > sizes */
> >  	__u32   cap_offset;	/* Offset within info struct of first cap */
> > +	__u32   reserved;
> 
> isn't this conflicting with the new 'pad' field introduced in your another
> patch " [PATCH v3] vfio: align capability structures"?
> 
> @@ -1304,6 +1305,7 @@ struct vfio_iommu_type1_info {
>  #define VFIO_IOMMU_INFO_CAPS	(1 << 1)	/* Info supports caps */
>  	__u64	iova_pgsizes;	/* Bitmap of supported page sizes */
>  	__u32   cap_offset;	/* Offset within info struct of first cap */
> +	__u32   pad;
>  };

Yes, I will rebase this series when "[PATCH v3] vfio: align capability
structures" is merged. I see the __aligned_u64 as a separate issue and
don't want to combine the patch series.

Stefan

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