linux-kernel - Re: [RFC PATCH 1/5] nvme-pci: add function nvme_submit_vf_cmd to issue admin commands for VF driver.

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Date:   Wed, 7 Dec 2022 17:35:06 +0100
From:   Christoph Hellwig <hch@....de>
To:     Max Gurtovoy <mgurtovoy@...dia.com>
Cc:     Christoph Hellwig <hch@....de>, Jason Gunthorpe <jgg@...pe.ca>,
        Lei Rao <lei.rao@...el.com>, kbusch@...nel.org, axboe@...com,
        kch@...dia.com, sagi@...mberg.me, alex.williamson@...hat.com,
        cohuck@...hat.com, yishaih@...dia.com,
        shameerali.kolothum.thodi@...wei.com, kevin.tian@...el.com,
        mjrosato@...ux.ibm.com, linux-kernel@...r.kernel.org,
        linux-nvme@...ts.infradead.org, kvm@...r.kernel.org,
        eddie.dong@...el.com, yadong.li@...el.com, yi.l.liu@...el.com,
        Konrad.wilk@...cle.com, stephen@...eticom.com, hang.yuan@...el.com
Subject: Re: [RFC PATCH 1/5] nvme-pci: add function nvme_submit_vf_cmd to
 issue admin commands for VF driver.

On Wed, Dec 07, 2022 at 04:50:00PM +0200, Max Gurtovoy wrote:
> When we perform step #3 we are narrowing it's scope and maybe some caps 
> that you're concerned of. After this setting, the controlled function is in 
> LM mode (we should define what does that mean in order to be able to 
> migrate it correctly) and the controlling function is the migration master 
> of it. Both can be aware of that. The only one that can master the 
> controlled function is the controlling function in LM mode. Thus, it will 
> be easy to keep that handle inside the kernel for VFs and for MDEVs as 
> well.

Maybe.  So you'd introduce a kernel linkage that both side would have
to be part of?