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 5381FC433F5 for ; Wed, 9 Mar 2022 09:26:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232031AbiCIJ1z (ORCPT ); Wed, 9 Mar 2022 04:27:55 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46058 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230034AbiCIJ1y (ORCPT ); Wed, 9 Mar 2022 04:27:54 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2F9DA14E96B; Wed, 9 Mar 2022 01:26:56 -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=wx0LygOHqaA+clNiNN9pPc6qEar1vXerfSIFRS40efQ=; b=ORYfGNMvE2n8lYf2GJqLC2C/Jt 7t2GTOGsKsY2G98Yz9HIfIbIGHPIQpxca+QHP8sQKttk0cKBaUOzKgWYwuZpE2JpGWi7Ofs3V+umV yzWAS3pSa2pP/UWAhntDY+IVs7jzgSKT/CV9Siuhy1cYo+6nnF3mX0Z3gLlHr8sorNBN0P2vwdV8A TZ7lNHchE2MSs9D1SHCKw7jRw6tCYgAu78KWoK5YjO8N+to3pxHjXPiB3+rV5vTdJpaIEs0Bo+t2Q 9cINcjrvajVmuywsgyCQeG/Oelq5RPEwzqLC5OpssJma+h0iefzJgxHIq6Ni6Amgv2szLJ1B8glPS exlesTPA==; Received: from [54.239.6.188] (helo=freeip.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nRsaq-00Gzb1-Hq; Wed, 09 Mar 2022 09:26:52 +0000 Message-ID: Subject: Re: [PATCH v7 1/2] KVM: LAPIC: Make lapic timer unpinned From: David Woodhouse To: Wanpeng Li , linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Paolo Bonzini , Radim =?UTF-8?Q?Kr=C4=8Dm=C3=A1=C5=99?= , Marcelo Tosatti Date: Wed, 09 Mar 2022 10:26:51 +0100 In-Reply-To: <1562376411-3533-2-git-send-email-wanpengli@tencent.com> 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="=-OLAP3CQDu2IJhJzsWaIq" 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: kvm@vger.kernel.org --=-OLAP3CQDu2IJhJzsWaIq Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable 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 the > 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 kick > after setting the KVM_REQ_PENDING_TIMER bit, make lapic timer unpinned > 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(-) ... > @@ -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 > /* 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. If not, can't we just kill __kvm_migrate_apic_timer() off completely not? --=-OLAP3CQDu2IJhJzsWaIq 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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