linux-kernel - Re: [Qemu-devel] [RFC PATCH 0/2] virtio-mmio: add irqfd support for vhost-net based on virtio-mmio

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Message-ID: <544E2B18.8010702@huawei.com>
Date:	Mon, 27 Oct 2014 19:23:04 +0800
From:	Li Liu <john.liuli@...wei.com>
To:	Peter Maydell <peter.maydell@...aro.org>
CC:	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Joel Schopp <joel.schopp@....com>,
	Yingshiuan Pan <yingshiuan.pan@...il.com>,
	"Michael S. Tsirkin" <mst@...hat.com>, <remy.gauguey@....fr>,
	Rusty Russell <rusty@...tcorp.com.au>,
	QEMU Developers <qemu-devel@...gnu.org>,
	"Nikolay Nikolaev" <n.nikolaev@...tualopensystems.com>,
	"virtualization@...ts.linux-foundation.org" 
	<virtualization@...ts.linux-foundation.org>,
	<peter.huangpeng@...wei.com>
Subject: Re: [Qemu-devel] [RFC PATCH 0/2] virtio-mmio: add irqfd support for
 vhost-net based on virtio-mmio



On 2014/10/27 17:37, Peter Maydell wrote:
> On 25 October 2014 09:24, john.liuli <john.liuli@...wei.com> wrote:
>> To get the interrupt reason to support such VIRTIO_NET_F_STATUS
>> features I add a new register offset VIRTIO_MMIO_ISRMEM which
>> will help to establish a shared memory region between qemu and
>> virtio-mmio device. Then the interrupt reason can be accessed by
>> guest driver through this region. At the same time, the virtio-mmio
>> dirver check this region to see irqfd is supported or not during
>> the irq handler registration, and different handler will be assigned.
> 
> If you want to add a new register you should probably propose
> an update to the virtio spec. However, it seems to me it would
> be better to get generic PCI/PCIe working on the ARM virt
> board instead; then we can let virtio-mmio quietly fade away.
> This has been on the todo list for ages (and there have been
> RFC patches posted for plain PCI), it's just nobody's had time
> to work on it.
> 
> thanks
> -- PMM
> 

So you mean virtio-mmio will be replaced by PCI/PCIe on ARM at last?
If so, let this patch go with the wind:). Thx.

Li.
> .
> 

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