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

Christian Borntraeger
2015-02-23T12:56:57Z

Am 20.02.2015 um 16:22 schrieb Alexander Graf:
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>
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>> Am 20.02.2015 um 16:00 schrieb Michael Mueller <mimu@linux.vnet.ibm.com>:
>>
>> On Fri, 20 Feb 2015 14:54:23 +0100
>> Alexander Graf <agraf@suse.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.