Re: [Qemu-devel] qemu-kvm upstreaming: Do we want -kvm-shadow-memory semantics?

[Jan Kiszka]

On 2012-01-25 13:04, Avi Kivity wrote:
> On 01/25/2012 01:57 PM, Jan Kiszka wrote:
>>>
>>> -kvm-shadow-memory is becoming less meaningful for ordinary workloads
>>> since everything uses TDP these days.  It's still meaningful for testing
>>> (forcing aggressive cache replacement), or perhaps nested virtualization.
>>
>> So, is it used for testing in fact? 
> 
> It is not, but it should be.  There's an extra_params option in
> autotest, I'll start using it to stress the mmu some more, even though
> it's going to slow things down for me.

OK.

> 
>> Would a machine option
>> "kvm_shadow_memory=n" be desirable?
> 
> Not sure, this is a host option, not a guest option.  Machine options
> should be guest-visible.

machine options are not guest visible. Basically, this options falls
into the same category as kernel_irqchip.

Do we have alternatives? A top-level command line options is surely none.

Jan

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