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

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Date:	Fri, 20 Feb 2015 17:57:52 +0100
From:	Alexander Graf <agraf@...e.de>
To:	Michael Mueller <mimu@...ux.vnet.ibm.com>
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 20.02.15 16:49, Michael Mueller wrote:
> On Fri, 20 Feb 2015 16:22:20 +0100
> Alexander Graf <agraf@...e.de> wrote:
> 
>>>>
>>>> Just make this uint64_t fac_list[2]. That way we don't have to track any
>>>> messy allocations.  
>>>
>>> It will be something like "uint64_t fac_list[S390_CPU_FAC_LIST_SIZE_UINT64]" and in total 2KB
>>> not just 16 bytes but I will change it.   
>>
>> Why? Do we actually need that many? This is a qemu internal struct.
> 
> How do you know that 2 is a good size?

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

> 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?


Alex
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