netdev - Re: [PATCH net-next 06/10] net/mlx4_core: Fix struct mlx4_vhcr

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Date:	Tue, 27 Jan 2015 16:43:02 +0200
From:	Jack Morgenstein <jackm@....mellanox.co.il>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	'Amir Vadai' <amirv@...lanox.com>,
	"David S. Miller" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"Or Gerlitz" <ogerlitz@...lanox.com>,
	Yevgeny Petrilin <yevgenyp@...lanox.com>
Subject: Re: [PATCH net-next 06/10] net/mlx4_core: Fix struct mlx4_vhcr_cmd
 to make implicit padding explicit

On Tue, 27 Jan 2015 13:38:28 +0000
David Laight <David.Laight@...LAB.COM> wrote:

> Haven't you broken communication between an old and new
> 32bit Guests and 32bit hosts (assuming they exist)?

Yes, but I don't see any interest on the net in running 32-bit Hosts
with virtualization and SR IOV.  I do see that there is interest in
running 32-bit Guests over 64-bit Hosts (which configuration KVM
supports).

Since this change is *required* for supporting 32-bit Guests on 64-bit
Hosts, I don't see that we have much choice here.

As you say, an old 32-bit Host will not be compatible with a new 32-bit
guest, and vice-versa. However, I would assume that almost all Hosts
would have 64-bit architectures, because of the performance and
memory-space requirements for running SRIOV and virtualization.
Therefore, I don't see this as a stopper.

-Jack
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