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

[Christoph Hellwig]

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.