linux-kernel - Re: [RFC PATCH 5/5] nvme-vfio: Add a document for the NVMe device

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Date:   Mon, 12 Dec 2022 08:57:07 +0100
From:   Christoph Hellwig <hch@....de>
To:     "Dong, Eddie" <eddie.dong@...el.com>
Cc:     Christoph Hellwig <hch@....de>, Jason Gunthorpe <jgg@...pe.ca>,
        "Rao, Lei" <lei.rao@...el.com>,
        "kbusch@...nel.org" <kbusch@...nel.org>,
        "axboe@...com" <axboe@...com>, "kch@...dia.com" <kch@...dia.com>,
        "sagi@...mberg.me" <sagi@...mberg.me>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "cohuck@...hat.com" <cohuck@...hat.com>,
        "yishaih@...dia.com" <yishaih@...dia.com>,
        "shameerali.kolothum.thodi@...wei.com" 
        <shameerali.kolothum.thodi@...wei.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "mjrosato@...ux.ibm.com" <mjrosato@...ux.ibm.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "Li, Yadong" <yadong.li@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Wilk, Konrad" <konrad.wilk@...cle.com>,
        "stephen@...eticom.com" <stephen@...eticom.com>,
        "Yuan, Hang" <hang.yuan@...el.com>
Subject: Re: [RFC PATCH 5/5] nvme-vfio: Add a document for the NVMe device

On Tue, Dec 06, 2022 at 06:00:27PM +0000, Dong, Eddie wrote:
> NVMe spec is general, but the implementation details (such as internal state) may 
> be vendor specific. If the migration happens between 2 identical NVMe devices 
> (from same vendor/device w/ same firmware version), migration of 
> subsystem-wide state can be naturally covered, right?

No.  If you want live migration for nvme supported in Linux, it must
be speced in the NVMe technical working group and interoperate between
different implementations.