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Date: Thu, 14 Jan 2016 15:50:40 +0800
From: Yuanhan Liu <yuanhan.liu@linux.intel.com>
To: "Xie, Huawei" <huawei.xie@intel.com>
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Cc: "dev@dpdk.org" <dev@dpdk.org>, "Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: [dpdk-dev] [PATCH v2 7/7] virtio: add 1.0 support
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On Thu, Jan 14, 2016 at 07:47:17AM +0000, Xie, Huawei wrote:
> On 1/12/2016 2:58 PM, Yuanhan Liu wrote:
> > Modern (v1.0) virtio pci device defines several pci capabilities.
> [snip]
> > +static void
> > +modern_notify_queue(struct virtio_hw *hw __rte_unused, struct virtqueue *vq)
> > +{
> > +	modern_write16(1, vq->notify_addr);
> > +}
> 
> Does virtio 1.0 only supports MMIO? MMIO has long VMEXIT latency than
> PORT IO.

Virtio 1.0 supports three transport layer, including MMIO and PCI. And
we use PCI only in our pmd driver.

	--yliu