From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Subject: Re: [RFC PATCH kernel] Revert "net/mlx4_core: Set UAR page size to
 4KB regardless of system page size"
Date: Tue, 15 Mar 2016 05:18:32 -0700
Message-ID: <20160315121832.GA4741@infradead.org>
References: <1458037148-4475-1-git-send-email-aik@ozlabs.ru>
 <CAJ3xEMhxUuQj+E00fa-tEKz+dVzDqFspC80Z=k7UPZpOP30H3g@mail.gmail.com>
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To: Or Gerlitz <gerlitz.or-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Alexey Kardashevskiy <aik-sLpHqDYs0B2HXe+LvDLADg@public.gmane.org>, Huy Nguyen <huyn-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>, Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Eugenia Emantayev <eugenia-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>, Hal Rosenstock <hal.rosenstock-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Sean Hefty <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, Yishai Hadas <yishaih-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>, Linux Kernel <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Linux Netdev List <netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Paul Mackerras <paulus-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>, Carol L Soto <clsoto-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>, Yevgeny Petrilin <yevgenyp-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
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On Tue, Mar 15, 2016 at 12:40:06PM +0200, Or Gerlitz wrote:
> "[..] Regarding backward compatibility in SR-IOV, if hypervisor has
> this new code, the virtual OS must be updated. [...]"

Which is broken, we can't break user or guest VM ABIs ever.
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Date: Tue, 15 Mar 2016 05:18:32 -0700
From: Christoph Hellwig <hch@infradead.org>
To: Or Gerlitz <gerlitz.or@gmail.com>
Cc: Alexey Kardashevskiy <aik@ozlabs.ru>, Huy Nguyen <huyn@mellanox.com>,
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        Paul Mackerras <paulus@samba.org>, Carol L Soto <clsoto@us.ibm.com>,
        Yevgeny Petrilin <yevgenyp@mellanox.com>
Subject: Re: [RFC PATCH kernel] Revert "net/mlx4_core: Set UAR page size to
 4KB regardless of system page size"
Message-ID: <20160315121832.GA4741@infradead.org>
References: <1458037148-4475-1-git-send-email-aik@ozlabs.ru>
 <CAJ3xEMhxUuQj+E00fa-tEKz+dVzDqFspC80Z=k7UPZpOP30H3g@mail.gmail.com>
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On Tue, Mar 15, 2016 at 12:40:06PM +0200, Or Gerlitz wrote:
> "[..] Regarding backward compatibility in SR-IOV, if hypervisor has
> this new code, the virtual OS must be updated. [...]"

Which is broken, we can't break user or guest VM ABIs ever.