On 2/28/18 7:50 PM, Paolo Bonzini wrote: > On 28/02/2018 00:55, Alexander Graf wrote: >> >> On 27.02.18 10:52, Gonglei (Arei) wrote: >>> Hi all, >>> >>> Guests could achive good performance in 'Message Passing Workloads' >>> scenarios when knowing the X86_FEATURE_MWAIT feature which is presented by >>> qemu. >>> the reason is that after knowing that feature, >>> the guest could use mwait method, which saves VMEXIT, >>> to do idle, and achives high performace in latency-sensitive scenario. >>> >>> Is there any plan for this patch? >>> >>> Or May I send a updated version based on yours? @Alex? >> Oh, did I drop the ball on this one? If that's the case, sure, go ahead. > Hi, it is probably best to implement this feature based on the > HINT_DEDICATED cpuid bit that Wanpeng Li is adding.
https://lkml.org/lkml/2018/2/13/624 As you pointed out, MWAIT/HLT/PAUSE non-exiting should be implemented at the same time and I'm still working on it. I will prepare patches for both the qemu and kvm stuffs. :) Regards, Wanpeng Li
