linux-kernel - Re: [PATCH 0/3] KVM: X86: Single target IPI fastpath enhancement

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Date:   Thu, 26 Mar 2020 10:46:36 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Wanpeng Li <kernellwp@...il.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH 0/3] KVM: X86: Single target IPI fastpath enhancement

On 26/03/20 03:19, Wanpeng Li wrote:
> The original single target IPI fastpath patch forgot to filter the 
> ICR destination shorthand field. Multicast IPI is not suitable for 
> this feature since wakeup the multiple sleeping vCPUs will extend 
> the interrupt disabled time, it especially worse in the over-subscribe 
> and VM has a little bit more vCPUs scenario. Let's narrow it down to 
> single target IPI. In addition, this patchset micro-optimize virtual 
> IPI emulation sequence for fastpath.
> 
> Wanpeng Li (3):
>   KVM: X86: Delay read msr data iff writes ICR MSR
>   KVM: X86: Narrow down the IPI fastpath to single target IPI
>   KVM: X86: Micro-optimize IPI fastpath delay
> 
>  arch/x86/kvm/lapic.c |  4 ++--
>  arch/x86/kvm/lapic.h |  1 +
>  arch/x86/kvm/x86.c   | 14 +++++++++++---
>  3 files changed, 14 insertions(+), 5 deletions(-)
> 

Queued 2 for 5.6 and 1-3 for 5.7, thanks.

Paolo