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

From: Or Gerlitz
Date: Tue Mar 15 2016 - 10:23:38 EST

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