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

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Message-ID: <1386068884.13256.9.camel@kazak.uk.xensource.com>
Date:	Tue, 3 Dec 2013 11:08:04 +0000
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	David Vrabel <david.vrabel@...rix.com>
CC:	Roger Pau Monne <roger.pau@...rix.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Julien Grall <julien.grall@...aro.org>,
	<linux-kernel@...r.kernel.org>, <xen-devel@...ts.xenproject.org>,
	"Boris Ostrovsky" <boris.ostrovsky@...cle.com>
Subject: Re: [Xen-devel] [PATCH RFC] xen-block: correctly define structures
 in public headers

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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