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

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Message-ID: <205cfbcb-a989-dc72-8f5d-46d2a00b01d9@linaro.org>
Date:   Thu, 31 Aug 2023 10:45:50 +0200
From:   Philippe Mathieu-Daudé <philmd@...aro.org>
To:     Stefan Hajnoczi <stefanha@...hat.com>, kvm@...r.kernel.org
Cc:     David Laight <David.Laight@...LAB.COM>,
        linux-kernel@...r.kernel.org, "Tian, Kevin" <kevin.tian@...el.com>,
        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

On 29/8/23 20:27, Stefan Hajnoczi wrote:
> 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>
> ---
>   include/uapi/linux/vfio.h | 18 +++++++++---------
>   1 file changed, 9 insertions(+), 9 deletions(-)

Reviewed-by: Philippe Mathieu-Daudé <philmd@...aro.org>