linux-kernel - Re: [RFC PATCH kernel] Revert "net/mlx4_core: Set UAR page size to 4KB regardless of system page size"

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Message-ID: <CAJ3xEMg5fq3Z2VH_qDjsFmTzhCibAGiXT9oEddEKbwktvSYSQQ@mail.gmail.com>
Date:	Tue, 15 Mar 2016 16:23:33 +0200
From:	Or Gerlitz <gerlitz.or@...il.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Alexey Kardashevskiy <aik@...abs.ru>,
	Huy Nguyen <huyn@...lanox.com>,
	Doug Ledford <dledford@...hat.com>,
	Eugenia Emantayev <eugenia@...lanox.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Yishai Hadas <yishaih@...lanox.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Carol L Soto <clsoto@...ibm.com>,
	Yevgeny Petrilin <yevgenyp@...lanox.com>,
	Daniel Jurgens <danielj@...lanox.com>,
	Eli Cohen <eli@...lanox.com>
Subject: Re: [RFC PATCH kernel] Revert "net/mlx4_core: Set UAR page size to
 4KB regardless of system page size"

On Tue, Mar 15, 2016 at 2:18 PM, Christoph Hellwig <hch@...radead.org> wrote:
> 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.

Let us check. I was under (the maybe wrong) impression, that before this
patch both PF/VF drivers were not operative on some systems, so on those
systems it's fair to require the VF driver to be patched too.

Or.