Re: [Xen-devel] [PATCH] make shared_info architecture independent

[Keir Fraser <keir@xxxxxxxxxxxxx>]

On 1/12/06 08:17, "Yang, Xiaowei" <xiaowei.yang@xxxxxxxxx> wrote:

> I don't quite understand what "break ABI compatibility" mean? Doesn't it
> mean old domX kernel can't run with new HV or vice versa? Since we only
> made a small change to evtchn structure inside and exported APIs is
> untouched, we think it won't affect others.

Yes, that's precisely what ABI compatibility means. Your patch breaks it and
so is unacceptable.

Luckily Jan Beulich has done the hard work of supporting the current 32-bit
ABI on a 64-bit hypervisor. He did this primarily to support paravirtual PAE
guests on 64-bit hypervisor, but I'm sure the work can be (fairly) easily
extended to support 32-bit PV-on-HVM drivers on 64-bit hypervisor.

 -- Keir


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