From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6544EC433F5 for ; Wed, 9 Mar 2022 15:04:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233651AbiCIPE5 (ORCPT ); Wed, 9 Mar 2022 10:04:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43594 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230095AbiCIPE4 (ORCPT ); Wed, 9 Mar 2022 10:04:56 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 77DF3B1AB8; Wed, 9 Mar 2022 07:03:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=kaDMk40kkbRkmKF6Kh1qJAiYnvUxpwHNkkg9zKmPd4A=; b=IMce/udvJ8Lhbi8t3P3FO7jnPj vf9NqCfWofhh1YMmaquyLtFiR47/L5sBw09GYgz85/7yxQncSceyK80n3dkni2RTXeZTB1Fifj9iG huqeqV44rBPOAFlBG6HjJTvpyrlO22JzQ1WWE3bCUJMHEeYj6fqZnb28EkGFiLJOI4XuK068L/5aY Tp1THn7JL7OL5ZwhUzcQCB9u1/+R4nfkfB6sztROmZIJMh4BqLekRYnw+KV6CibGjTr78L4aYJaoL joRlHi7YXKh1hRPuQ3fVlipaFCkYWobIzdx9qhHMImJIPwFy8OOvw/Tn/U8iGY7dqtsXCHUf/U56r PLKjAkvA==; Received: from [54.239.6.184] (helo=u3832b3a9db3152.drs11.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nRxr0-00HDeT-PJ; Wed, 09 Mar 2022 15:03:55 +0000 Message-ID: <0e8f1e1a9653d95332cc8f0d461c3015ae20d03e.camel@infradead.org> Subject: Re: [PATCH v7 1/2] KVM: LAPIC: Make lapic timer unpinned From: David Woodhouse To: Marcelo Tosatti Cc: Wanpeng Li , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Paolo Bonzini Date: Wed, 09 Mar 2022 16:03:54 +0100 In-Reply-To: References: <1562376411-3533-1-git-send-email-wanpengli@tencent.com> <1562376411-3533-2-git-send-email-wanpengli@tencent.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-ItVIb4GwMd88VWexudHc" User-Agent: Evolution 3.36.5-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-ItVIb4GwMd88VWexudHc Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2022-03-09 at 08:24 -0300, Marcelo Tosatti wrote: > On Wed, Mar 09, 2022 at 10:26:51AM +0100, David Woodhouse wrote: > > On Sat, 2019-07-06 at 09:26 +0800, Wanpeng Li wrote: > > > From: Wanpeng Li > > >=20 > > > Commit 61abdbe0bcc2 ("kvm: x86: make lapic hrtimer pinned") pinned th= e > > > lapic timer to avoid to wait until the next kvm exit for the guest to > > > see KVM_REQ_PENDING_TIMER set. There is another solution to give a ki= ck > > > after setting the KVM_REQ_PENDING_TIMER bit, make lapic timer unpinne= d > > > will be used in follow up patches. > > >=20 > > > Cc: Paolo Bonzini > > > Cc: Radim Kr=C4=8Dm=C3=A1=C5=99 > > > Cc: Marcelo Tosatti > > > Signed-off-by: Wanpeng Li > > > --- > > > arch/x86/kvm/lapic.c | 8 ++++---- > > > arch/x86/kvm/x86.c | 6 +----- > > > 2 files changed, 5 insertions(+), 9 deletions(-) > >=20 > > ... > >=20 > >=20 > > > @@ -2510,7 +2510,7 @@ void __kvm_migrate_apic_timer(struct kvm_vcpu *= vcpu) > > > =20 > > > timer =3D &vcpu->arch.apic->lapic_timer.timer; > > > if (hrtimer_cancel(timer)) > > > - hrtimer_start_expires(timer, HRTIMER_MODE_ABS_PINNED); > > > + hrtimer_start_expires(timer, HRTIMER_MODE_ABS); > > > } > > > =20 > > > /* > >=20 > > Wait, in that case why are we even bothering to cancel and restart the > > timer? I thought the whole point of that was to pin it to the *new* CPU > > that this vCPU is running on. > >=20 > > If not, can't we just kill __kvm_migrate_apic_timer() off completely > > not? >=20 > Current code looks like this: >=20 > void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu) > { > struct hrtimer *timer; >=20 > if (!lapic_in_kernel(vcpu) || > kvm_can_post_timer_interrupt(vcpu)) <---------- > return; >=20 > timer =3D &vcpu->arch.apic->lapic_timer.timer; > if (hrtimer_cancel(timer)) > hrtimer_start_expires(timer, HRTIMER_MODE_ABS_HARD); > } >=20 > Yeah, should be HRTIMER_MODE_ABS_PINNED AFAICS. No, it's *intentionally* not pinned any more, since this patch that I'm replying to, which became commit 4d151bf3b89. It doesn't *have* to run on the same physical CPU, because of the epiphany that it can just call kvm_vcpu_kick() after making the request. But if it's a recurring timer it's still *best* for it to run on the same physical CPU, just for cache locality reasons. So I think I was wrong; the migration *isn't* pointless. It's still a valid optimisation; it's just not *mandatory* any more. --=-ItVIb4GwMd88VWexudHc Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf 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