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Date:   Fri, 3 May 2019 22:00:54 +0300
From:   Max Gurtovoy <>
To:     Christoph Hellwig <>,
        Maxim Levitsky <>
CC:     Fam Zheng <>, <>,
        Wolfram Sang <>,
        <>, <>,
        Keith Busch <>,
        "Kirti Wankhede" <>,
        Mauro Carvalho Chehab <>,
        "Paul E . McKenney" <>,
        Christoph Hellwig <>,
        Sagi Grimberg <>,
        "Liang Cunming" <>,
        Jens Axboe <>,
        "Alex Williamson" <>,
        John Ferlan <>,
        Liu Changpeng <>,
        Jens Axboe <>,
        "Greg Kroah-Hartman" <>,
        Nicolas Ferre <>,
        Paolo Bonzini <>,
        "Amnon Ilan" <>,
        "David S . Miller" <>
Subject: Re: [PATCH v2 06/10] nvme/core: add mdev interfaces

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 ?

> _______________________________________________
> Linux-nvme mailing list

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