linux-kernel - RE: [PATCH v2 1/3] vfio: trivially use __aligned

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Date:   Mon, 11 Sep 2023 06:06:35 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Stefan Hajnoczi <stefanha@...hat.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>
CC:     David Laight <David.Laight@...LAB.COM>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Jason Gunthorpe <jgg@...dia.com>
Subject: RE: [PATCH v2 1/3] vfio: trivially use __aligned_u64 for ioctl
 structs

> From: Stefan Hajnoczi <stefanha@...hat.com>
> Sent: Wednesday, August 30, 2023 2:27 AM
> 
> u64 alignment behaves differently depending on the architecture and so
> <uapi/linux/types.h> offers __aligned_u64 to achieve consistent behavior
> in kernel<->userspace ABIs.
> 
> There are structs in <uapi/linux/vfio.h> that can trivially be updated
> to __aligned_u64 because the struct sizes are multiples of 8 bytes.
> There is no change in memory layout on any CPU architecture and
> therefore this change is safe.
> 
> The commits that follow this one handle the trickier cases where
> explanation about ABI breakage is necessary.
> 
> Suggested-by: Jason Gunthorpe <jgg@...dia.com>
> Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
> Signed-off-by: Stefan Hajnoczi <stefanha@...hat.com>

Reviewed-by: Kevin Tian <kevin.tian@...el.com>