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Date:   Wed,  4 Oct 2023 18:29:35 -0700
From:   Sean Christopherson <>
To:     Sean Christopherson <>, kvm <>,
        David Woodhouse <>
Cc:     Paul Durrant <>, Paolo Bonzini <>,
        Thomas Gleixner <>,
        Ingo Molnar <>, Borislav Petkov <>,
        Dave Hansen <>,,
        "H. Peter Anvin" <>,
Subject: Re: [PATCH v3] KVM: x86: Use fast path for Xen timer delivery

On Sat, 30 Sep 2023 14:58:35 +0100, David Woodhouse wrote:
> Most of the time there's no need to kick the vCPU and deliver the timer
> event through kvm_xen_inject_timer_irqs(). Use kvm_xen_set_evtchn_fast()
> directly from the timer callback, and only fall back to the slow path
> when it's necessary to do so.
> This gives a significant improvement in timer latency testing (using
> nanosleep() for various periods and then measuring the actual time
> elapsed).
> [...]

Applied to kvm-x86 xen, thanks!

[1/1] KVM: x86: Use fast path for Xen timer delivery


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