Re: [PATCH v2 06/10] nvme/core: add mdev interfaces

[Max Gurtovoy]

On 5/3/2019 3:29 PM, Christoph Hellwig wrote:
> On Thu, May 02, 2019 at 02:47:57PM +0300, Maxim Levitsky wrote:
> > If the mdev device driver also sets the
> > NVME_F_MDEV_DMA_SUPPORTED, the mdev core will
> > dma map all the guest memory into the nvme device,
> > so that nvme device driver can use dma addresses as passed
> > from the mdev core driver
> We really need a proper block layer interface for that so that
> uring or the nvme target can use pre-mapping as well.

I think we can also find a way to use nvme-mdev for the target offload 
p2p feature.

Don't see a big difference of taking NVMe queue and namespace/partition 
to guest OS or to P2P since IO is issued by external entity and pooled 
outside the pci driver.

thoughts ?


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