Re: [PATCH v3] virtio_blk: add VIRTIO_BLK_F_LIFETIME feature support

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On Wed, Dec 07, 2022 at 08:31:28AM -0800, Christoph Hellwig wrote:
> On Wed, Dec 07, 2022 at 05:21:48AM -0500, Michael S. Tsirkin wrote:
> > Christoph you acked the spec patch adding this to virtio blk:
> > 
> > 	Still not a fan of the encoding, but at least it is properly documented
> > 	now:
> > 
> > 	Acked-by: Christoph Hellwig <hch@xxxxxx>
> > 
> > Did you change your mind then? Or do you prefer a different encoding for
> > the ioctl then? could you help sugesting what kind?
> 
> Well, it is good enough documented for a spec.  I don't think it is
> a useful feature for Linux where virtio-blk is our minimum viable
> paravirtualized block driver.

No idea what this means, sorry.  Now that's in the spec I expect (some)
devices to implement it and if they do I see no reason not to expose the
data to userspace.

Alvaro could you pls explain the use-case? Christoph has doubts that
it's useful. Do you have a device implementing this?

-- 
MST

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