Re: [v3 13/26] KVM: Define a new interface kvm_find_dest_vcpu() for VT-d PI

[Paolo Bonzini]

On 09/01/2015 15:54, Radim KrÄmÃÅ wrote:
> There are two points relevant to this patch in new KVM's implementation,
> ("KVM: x86: amend APIC lowest priority arbitration",
>  https://lkml.org/lkml/2015/1/9/362)
> 
> 1) lowest priority depends on TPR
> 2) there is no need for balancing
> 
> (1) has to be considered with PI as well.

The chipset doesn't support it. :(

> I kept (2) to avoid whining from people building on that behaviour, but
> lowest priority backed by PI could be transparent without it.
> 
> Patch below removes the balancing, but I am not sure this is a price we
> allowed ourselves to pay ... what are your opinions?

I wouldn't mind, but it requires a lot of benchmarking.

Paolo
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