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Message-ID: <e16f0d326d4c6976a9cd194faa66e5eaf8b0c47d.camel@infradead.org>
Subject: Re: [PATCH] KVM: x86: Use fast path for Xen timer delivery
From:   David Woodhouse <dwmw2@infradead.org>
To:     paul@xen.org, kvm <kvm@vger.kernel.org>
Cc:     Sean Christopherson <seanjc@google.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org,
        "H. Peter Anvin" <hpa@zytor.com>, linux-kernel@vger.kernel.org,
        "Griffoul, Fred" <fgriffo@amazon.com>
Date:   Fri, 22 Sep 2023 10:29:25 +0100
In-Reply-To: <dff1ad07-8649-4916-bbc1-ab5cc403bb89@xen.org>
References: <445abd6377cf1621a2d306226cab427820583967.camel@infradead.org>
         <dff1ad07-8649-4916-bbc1-ab5cc403bb89@xen.org>
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On Fri, 2023-09-22 at 10:22 +0100, Paul Durrant wrote:
> On 22/09/2023 10:20, David Woodhouse wrote:
> > From: David Woodhouse <dwmw@amazon.co.uk>
> >=20
> > 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.
> >=20
> > This gives a significant improvement in timer latency testing (using
> > nanosleep() for various periods and then measuring the actual time
> > elapsed).
> >=20
> > Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
> > ---
> > =C2=A0 arch/x86/kvm/xen.c | 17 ++++++++++++++---
> > =C2=A0 1 file changed, 14 insertions(+), 3 deletions(-)
> >=20
> > diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c
> > index 40edf4d1974c..66c4cf93a55c 100644
> > --- a/arch/x86/kvm/xen.c
> > +++ b/arch/x86/kvm/xen.c
> > @@ -134,12 +134,23 @@ static enum hrtimer_restart xen_timer_callback(st=
ruct hrtimer *timer)
> > =C2=A0 {
> > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0struct kvm_vcpu *vcpu =
=3D container_of(timer, struct kvm_vcpu,
> > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 arch.xen.timer);
> > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0struct kvm_xen_evtchn e;
> > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0int rc;
> > +
> > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (atomic_read(&vcpu->=
arch.xen.timer_pending))
> > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0return HRTIMER_NORESTART;
> > =C2=A0=20
> > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0atomic_inc(&vcpu->arch.xen.t=
imer_pending);
> > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0kvm_make_request(KVM_REQ_UNB=
LOCK, vcpu);
> > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0kvm_vcpu_kick(vcpu);
> > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0e.vcpu_id =3D vcpu->vcpu_id;
> > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0e.vcpu_idx =3D vcpu->vcpu_id=
x;
> > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0e.port =3D vcpu->arch.xen.ti=
mer_virq;
>=20
> Don't you need to check the port for validity? The VMM may not have set=
=20
> it (and hence be delivering timer VIRQ events itself).

Nah, the kvm_xen_timer_enabled() check which gates all the kernel
interception of timer hypercalls is already testing precisely that.

If the TIMER_VIRQ isn't set, none of this code runs. And when userspace
tears down TIMER_VIRQ, the hrtimer is cancelled. So none of this code
(then) runs.

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