Re: RFC/patch portability: split kvm_vm_ioctl

[Christian Ehrhardt <ehrhardt-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>]

Carsten Otte wrote:
> 
> Avi Kivity wrote:
>> We need to distinguish between x86 specific (only x86 has this) and s390
>> special (everyone has it except s390). In the latter case it should
>> still be in common code to avoid duplication, with a guard to disable
>> compilation on s390.
>>
>> KVM_SET_MEMORY_REGION is in theory applicable to non-s390 but I'd like
>> to deprecate it, so there's no point in implementing it on non-x86. The
>> rest are s390 special rather than x86 specific.
>>
>> As related previously, KVM_SET_USER_MEMORY_REGION should work for s390
>> (with an extra check for the guest phsyical start address).
> I thought about that all through the weekend. To me, it looks like I 
> want to eliminate "s390 special" as far as possible. In given case, 
> I'll follow Anthonys suggestion and support 
> KVM_SET_USER_MEMORY_REGION. KVM_SET_MEMORY_REGION will also go common, 
> and in case we're pushing the actual port before you deprecate that 
> call, we'll #ifdef CONFIG_ARCH_S390 around it.
> 
> As for the pic/apic part, I think it is x86 specific. Christian 
> Ehrhardt stated he believes ppc won't have that too.

At least not in that manner x86 has it atm (which would be  enough for
splitting it per arch), since I'm unsure in that topic I set Hollis on cc
who should know it better with his larger power experience.

> 
> Will create another patch on vm_ioctl that reflects this later today.
> 
> so long,
> Carsten
> 
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-- 

Grüsse / regards, 
Christian Ehrhardt

IBM Linux Technology Center, Open Virtualization
+49 7031/16-3385
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