linux-kernel - Re: [Patch v5 0/3] Introduce a driver to support host accelerated access to Microsoft Azure Blob for Azure VM

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Message-ID: <87fstb3h6h.fsf@vitty.brq.redhat.com>
Date:   Fri, 08 Oct 2021 13:11:02 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Long Li <longli@...rosoft.com>
Cc:     Bart Van Assche <bvanassche@....org>,
        "longli@...uxonhyperv.com" <longli@...uxonhyperv.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Hans de Goede <hdegoede@...hat.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        Maximilian Luz <luzmaximilian@...il.com>,
        Mike Rapoport <rppt@...nel.org>,
        Ben Widawsky <ben.widawsky@...el.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        Andra Paraschiv <andraprs@...zon.com>,
        Siddharth Gupta <sidgup@...eaurora.org>,
        Hannes Reinecke <hare@...e.de>
Subject: Re: [Patch v5 0/3] Introduce a driver to support host accelerated
 access to Microsoft Azure Blob for Azure VM

Greg Kroah-Hartman <gregkh@...uxfoundation.org> writes:

...
>
> Not to mention the whole crazy idea of "let's implement our REST api
> that used to go over a network connection over an ioctl instead!"
> That's the main problem that you need to push back on here.
>
> What is forcing you to put all of this into the kernel in the first
> place?  What's wrong with the userspace network connection/protocol that
> you have today?
>
> Does this mean that we now have to implement all REST apis that people
> dream up as ioctl interfaces over a hyperv transport?  That would be
> insane.

As far as I understand, the purpose of the driver is to replace a "slow"
network connection to API endpoint with a "fast" transport over
Vmbus. So what if instead of implementing this new driver we just use
Hyper-V Vsock and move API endpoint to the host?

-- 
Vitaly