Re: [PATCH v3 8/8] vfio/pci: Add the support for PCI D3cold state

[Jason Gunthorpe]

On Tue, May 10, 2022 at 06:56:02PM +0530, Abhishek Sahu wrote:
> > We can add a directive to enforce an alignment regardless of the field
> > size.  I believe the feature ioctl header is already going to be eight
> > byte aligned, so it's probably not strictly necessary, but Jason seems
> > to be adding more of these directives elsewhere, so probably a good
> > idea regardless.  Thanks,

> So, should I change it like
> 
> __u8    low_power_state __attribute__((aligned(8)));
> 
>  Or
> 
> __aligned_u64 low_power_state

You should be explicit about padding, add a reserved to cover the gap.

Jasno