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.
