linux-kernel - Re: [Qemu-devel] [RFC PATCH v2 04/15] cpu-model/s390: Introduce S390 CPU models

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Message-ID: <20150220183748.45b32e11@bee>
Date:	Fri, 20 Feb 2015 18:37:48 +0100
From:	Michael Mueller <mimu@...ux.vnet.ibm.com>
To:	Alexander Graf <agraf@...e.de>
Cc:	"qemu-devel@...gnu.org" <qemu-devel@...gnu.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Gleb Natapov <gleb@...nel.org>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	"Jason J. Herne" <jjherne@...ux.vnet.ibm.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Andreas Faerber <afaerber@...e.de>,
	Richard Henderson <rth@...ddle.net>
Subject: Re: [Qemu-devel] [RFC PATCH v2 04/15] cpu-model/s390: Introduce
 S390 CPU models

On Fri, 20 Feb 2015 17:57:52 +0100
Alexander Graf <agraf@...e.de> wrote:

> Because all CPUs we have in our list only expose 128 bits?

Here a STFLE result on a EC12 GA2, already more than 128 bits... Is that model on the list?

[mimu@...lp59 s390xfac]$ ./s390xfac -b
fac[0] = 0xfbfffffbfcfff840
fac[1] = 0xffde000000000000
fac[2] = 0x1800000000000000
> 
> > I want to have this independent from a future machine of the z/Arch. The kernel stores the
> > full facility set, KVM does and there is no good reason for QEMU not to do. If other
> > accelerators decide to just implement 64 or 128 bits of facilities that's ok...  
> 
> So you want to support CPUs that are not part of the list?

The architecture at least defines more than 2 or 3. Do you want me to limit it to an arbitrary
size?. Only in QEMU or also in the KVM interface?

Thanks
Michael

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