Re: [Xen-devel] [PATCH RFC] xen-block: correctly define structures in public headers

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2013-12-03 at 11:01 +0000, David Vrabel wrote:
> On 03/12/13 10:57, Roger Pau Monne wrote:
> > Using __packed__ on the public interface is not correct, this
> > structures should be compiled using the native ABI, and __packed__
> > should only be used in the backend counterpart of those structures
> > (which needs to handle different ABIs).
> > 
> > This was even worse in the ARM case, where the Linux kernel was
> > incorrectly using the X86_32 protocol ABI. This patch fixes it, but
> > also breaks compatibility, so an ARM DomU kernel compiled with
> > this patch will fail to communicate with PV disk devices unless the
> > Dom0 also has this patch.
> 
> This ABI change needs to be justified.  Why do you think it is
> acceptable to break existing Linux guests?  Because I don't think it is.

As I explained in my reply those guests are buggy.

Ian.


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