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

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Date:   Fri, 3 May 2019 22:00:54 +0300
From:   Max Gurtovoy <maxg@...lanox.com>
To:     Christoph Hellwig <hch@...radead.org>,
        Maxim Levitsky <mlevitsk@...hat.com>
CC:     Fam Zheng <fam@...hon.net>, <kvm@...r.kernel.org>,
        Wolfram Sang <wsa@...-dreams.de>,
        <linux-nvme@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        Keith Busch <keith.busch@...el.com>,
        "Kirti Wankhede" <kwankhede@...dia.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "Paul E . McKenney" <paulmck@...ux.ibm.com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        "Liang Cunming" <cunming.liang@...el.com>,
        Jens Axboe <axboe@...com>,
        "Alex Williamson" <alex.williamson@...hat.com>,
        John Ferlan <jferlan@...hat.com>,
        Liu Changpeng <changpeng.liu@...el.com>,
        Jens Axboe <axboe@...nel.dk>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "Amnon Ilan" <ailan@...hat.com>,
        "David S . Miller" <davem@...emloft.net>
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
> Linux-nvme@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-nvme

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