linux-kernel - Re: [PATCH v1 1/2] x86/msi: Enhance x86 to support platform

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Date:   Fri, 17 Jan 2020 22:06:01 +0800
From:   "Liu, Jiang" <gerry@...ux.alibaba.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Zha Bin <zhabin@...ux.alibaba.com>, linux-kernel@...r.kernel.org,
        "Michael S. Tsirkin" <mst@...hat.com>, jasowang@...hat.com,
        slp@...hat.com, virtio-dev@...ts.oasis-open.org,
        jing2.liu@...el.com, chao.p.peng@...el.com
Subject: Re: [PATCH v1 1/2] x86/msi: Enhance x86 to support platform_msi



> On Jan 17, 2020, at 9:58 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
> 
> Zha Bin <zhabin@...ux.alibaba.com> writes:
> 
>> From: Liu Jiang <gerry@...ux.alibaba.com>
>> 
>> The x86 platform currently only supports specific MSI/MSI-x for PCI
>> devices. To enable MSI to the platform devices such as virtio-mmio
>> device, this patch enhances x86 with platform MSI by leveraging the
>> already built-in platform-msi driver (drivers/base/platform-msi.c)
>> and makes it as a configurable option.
> 
> Why are you trying to make this an architecture feature instead of
> having a generic implementation which can work on all architectures
> which support virtio-mmio?
Thanks, Thomas!
We are reworking to implement it as a generic irqdomain for all virtio MMIO devices.

> 
>> Signed-off-by: Liu Jiang <gerry@...ux.alibaba.com>
>> Signed-off-by: Zha Bin <zhabin@...ux.alibaba.com>
>> Signed-off-by: Chao Peng <chao.p.peng@...ux.intel.com>
>> Signed-off-by: Jing Liu <jing2.liu@...ux.intel.com>
> 
> This Signed-off-by chain is invalid.
> 
> Thanks,
> 
>        tglx