linux-kernel - Re: [PATCH] virtio_blk: Add support for lifetime feature

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Message-ID: <YHarc5gGgjyQOaA+@stefanha-x1.localdomain>
Date:   Wed, 14 Apr 2021 09:44:35 +0100
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Enrico Granata <egranata@...gle.com>, mst@...hat.com,
        jasowang@...hat.com, pbonzini@...hat.com, axboe@...nel.dk,
        virtualization@...ts.linux-foundation.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] virtio_blk: Add support for lifetime feature

On Mon, Apr 12, 2021 at 10:42:17AM +0100, Christoph Hellwig wrote:
> A note to the virtio committee:  eMMC is the worst of all the currently
> active storage standards by a large margin.  It defines very strange
> ad-hoc interfaces that expose very specific internals and often provides
> very poor abstractions.  It would be great it you could reach out to the
> wider storage community before taking bad ideas from the eMMC standard
> and putting it into virtio.

As Michael mentioned, there is still time to change the virtio-blk spec
since this feature hasn't been released yet.

Why exactly is exposing eMMC-style lifetime information problematic?

Can you and Enrico discuss the use case to figure out an alternative
interface?

Thanks,
Stefan

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