2017-11-09 17:17+0100, Peter Zijlstra:
> On Thu, Nov 09, 2017 at 05:05:36PM +0100, Radim Krcmar wrote:
> > 2017-11-09 10:53-0500, Pankaj Gupta:
> > > 2] PV TLB should also behave as per option PV_DEDICATED for better performance.
> >
> > Right,
>
> Shouldn't KVM do flush_tlb_other() in any case? Not sure how
> PV_DEDICATED can help with that.
It will, the suggestion was based on recent extension of the
flush_tlb_others implementaion, https://lkml.org/lkml/2017/11/8/1146.
PV_TLB_FLUSH allows a guest to set a flush bit instead of sending flush
IPI if the target VCPU is not running. This would be a waste of time
with PV_DEDICATED as all VCPUs are expected to always running.
With PV_DEDICATED, the guest should keep using native_flush_tlb_others.
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