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Re: [Qemu-devel] [PATCH v2 1/4] hostmem-memfd: disable for systems wihto

From: Gerd Hoffmann
Subject: Re: [Qemu-devel] [PATCH v2 1/4] hostmem-memfd: disable for systems wihtout sealing support
Date: Wed, 12 Dec 2018 07:49:36 +0100
User-agent: NeoMutt/20180716

On Tue, Dec 11, 2018 at 02:09:11PM +0300, Ilya Maximets wrote:
> On 11.12.2018 13:53, Daniel P. Berrangé wrote:
> >>
> >> Let's restrict memfd backend to systems with sealing support.
> > 
> > I don't think we need todo that - sealing is optional in the QEMU code,
> > we simply have it set to the wrong default when sealing is not available.
> That was literally what I've fixed in v1:
>     https://lists.nongnu.org/archive/html/qemu-devel/2018-11/msg05483.html
> but 2 people suggested me to disable memfd entirely for this case.
> Do you think I need to get patch from v1 back ?
> Gerd, Marc-André, what do you think?

I still think it makes sense to require sealing support.  Sealing is
very useful, and there are only a few kernel versions with memfd but
without sealing.  So finding such kernels in the wild will become more
rare over time.  I wouldn't worry too much about them.


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