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Re: [Qemu-devel] [PATCH 08/10] target-s390x: implement STFLE instruction

From: Aurelien Jarno
Subject: Re: [Qemu-devel] [PATCH 08/10] target-s390x: implement STFLE instruction
Date: Tue, 26 May 2015 08:03:13 +0200
User-agent: Mutt/1.5.23 (2014-03-12)

On 2015-05-25 16:08, Richard Henderson wrote:
> On 05/24/2015 04:47 PM, Aurelien Jarno wrote:
> >Cc: Alexander Graf <address@hidden>
> >Cc: Richard Henderson <address@hidden>
> >Signed-off-by: Aurelien Jarno <address@hidden>
> Sadly, implementing this breaks current kernels.
> I did this about two years ago and havn't figured
> out what to do about it.
> The silly code in head.S doesn't check for just the
> facilities that it needs, it checks for all facilities
> that specific processors provide.
> If we don't e.g. pretend that we have HFP, despite the
> fact that no one uses it, the kernel won't boot.

How does it breaks? This patch only enable bits corresponding to 
facility that we fully implement (that's a reason why the patchset
doesn't enable LD facility for example). So it should not be a problem,
at least I have been able to boot kernels successfully.

Aurelien Jarno                          GPG: 4096R/1DDD8C9B
address@hidden                 http://www.aurel32.net

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