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pvcalls: Document correctly and explicitely the padding for all arches
The specification of pvcalls suggests there is padding for 32-bit x86 at the end of most the structure. However, they are not described in in the public header. Because of that all the structures would have a different size between 32-bit x86 and 64-bit x86. For all the other architectures supported (Arm and 64-bit x86), the structure have the sames sizes because they contain implicit padding thanks to the 64-bit alignment of the field uint64_t field. Given the specification is authoritative, the padding will now be the same for all architectures. The potential breakage of compatibility is ought to be fine as pvcalls is still a tech preview. Signed-off-by: Julien Grall <jgrall@amazon.com> Reviewed-by: Juergen Gross <jgross@suse.com> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> Release-acked-by: Paul Durrant <paul@xen.org> Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
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