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Re: [Qemu-devel] [qemu-s390x] [PATCH] s390-bios: Skip bootmap signature

From: Cornelia Huck
Subject: Re: [Qemu-devel] [qemu-s390x] [PATCH] s390-bios: Skip bootmap signature entries
Date: Mon, 6 May 2019 13:05:42 +0200

On Mon, 6 May 2019 12:46:50 +0200
Christian Borntraeger <address@hidden> wrote:

> On 06.05.19 12:34, Cornelia Huck wrote:
> > On Mon, 6 May 2019 12:18:42 +0200
> > Christian Borntraeger <address@hidden> wrote:

> >> I think we should not. Those entries might have sematic elements that the 
> >> guest
> >> wants to enforce. I do not think that this will come, but imagine a boot 
> >> entry
> >> that mandates some security wishes (e.g. do only run on non-shared cores). 
> >>  
> > 
> > Can we split the namespace for BOOT_SCRIPT into 'ignore if you don't
> > know what that is' and 'fail if you don't know what that is'? I'm
> > completely confused how 'optional' those entries are supposed to be...  
> Since we do not know if and what future entries will come the current default
> of failing seems the best approach. We can then add things to pc-bios when
> necessary.

That's where I'm coming from: Have some values where unknown entries
lead to (desired) failure, and others where unknown entries are simply
ignored. That would give us automatic toleration for optional entries.

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