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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Date:   Mon, 11 Oct 2021 19:58:38 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Long Li <longli@...rosoft.com>
Cc:     vkuznets <vkuznets@...hat.com>,
        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

On Mon, Oct 11, 2021 at 05:46:48PM +0000, Long Li wrote:
> > 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?
> 
> Hi Vitaly,
> 
> We looked at Hyper-V Vsock when designing this driver. The problem is that the Hyper-V device model of Vsock can't support the data throughput and scale needed for Blobs. Vsock is mostly used for management tasks.
> 
> The usage of Blob in Azure justifies an dedicated VMBUS channel (and sub-channels) for a new VSP/VSC driver.

Why not just fix the vsock code to handle data better?  That way all
users of it would benefit.

thanks,

greg k-h