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

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Date:	Mon, 23 Feb 2015 13:56:57 +0100
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Alexander Graf <agraf@...e.de>,
	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>,
	"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

Am 20.02.2015 um 16:22 schrieb Alexander Graf:
> 
> 
> 
>> Am 20.02.2015 um 16:00 schrieb Michael Mueller <mimu@...ux.vnet.ibm.com>:
>>
>> On Fri, 20 Feb 2015 14:54:23 +0100
>> Alexander Graf <agraf@...e.de> wrote:
>>
>>>>
>>>> +/* machine related properties */
>>>> +typedef struct S390CPUMachineProps {
>>>> +    uint16_t class;      /* machine class */
>>>> +    uint16_t ga;         /* availability number of machine */
>>>> +    uint16_t order;      /* order of availability */
>>>> +} S390CPUMachineProps;
>>>> +
>>>> +/* processor related properties */
>>>> +typedef struct S390CPUProcessorProps {
>>>> +    uint16_t gen;        /* S390 CMOS generation */
>>>> +    uint16_t ver;        /* version of processor */
>>>> +    uint32_t id;         /* processor identification*/
>>>> +    uint16_t type;       /* machine type */
>>>> +    uint16_t ibc;        /* IBC value */
>>>> +    uint64_t *fac_list;  /* list of facilities */  
>>>
>>> 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.

The kernel already enabled the 3rd word for z13 support, 
https://git.kernel.org/cgit/linux/kernel/git/s390/linux.git/commit/?id=f8b2dcbd9e6d1479b9b5a9e9e78bbaf783bde819

so make it at least 3.

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