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

[Richard Henderson]

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.



r~