linux-kernel - Re: [Xen-devel] [RFC, v2, 1/9] hyper_dmabuf: initial upload of hyper

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Date:   Tue, 10 Apr 2018 14:04:45 +0300
From:   Oleksandr Andrushchenko <andr2000@...il.com>
To:     Julien Grall <julien.grall@....com>,
        Dongwon Kim <dongwon.kim@...el.com>,
        linux-kernel@...r.kernel.org, linaro-mm-sig@...ts.linaro.org,
        xen-devel@...ts.xenproject.org
Cc:     mateuszx.potrola@...el.com, dri-devel@...ts.freedesktop.org
Subject: Re: [Xen-devel] [RFC, v2, 1/9] hyper_dmabuf: initial upload of
 hyper_dmabuf drv core framework

On 04/10/2018 01:47 PM, Julien Grall wrote:
> Hi,
>
> On 04/10/2018 09:53 AM, Oleksandr Andrushchenko wrote:
>> On 02/14/2018 03:50 AM, Dongwon Kim wrote:
>>> diff --git a/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_id.h 
>
> [...]
>
>>> +#ifndef __HYPER_DMABUF_ID_H__
>>> +#define __HYPER_DMABUF_ID_H__
>>> +
>>> +#define HYPER_DMABUF_ID_CREATE(domid, cnt) \
>>> +    ((((domid) & 0xFF) << 24) | ((cnt) & 0xFFFFFF))
>> I would define hyper_dmabuf_id_t.id as a union or 2 separate
>> fields to avoid his magic
>
> I am not sure the union would be right here because the layout will 
> differs between big and little endian.
Agree
> So does that value will be passed to other guest?
As per my understanding yes, with HYPER_DMABUF_EXPORT request
>
> Cheers,
>