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 65A3EC433FE for ; Tue, 8 Feb 2022 13:22:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1377108AbiBHNWN (ORCPT ); Tue, 8 Feb 2022 08:22:13 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57606 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1357732AbiBHMgl (ORCPT ); Tue, 8 Feb 2022 07:36:41 -0500 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AE6FCC03FEC0; Tue, 8 Feb 2022 04:36:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; 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=Nb01ZpYYzQEXF2HrWAI67dHAOgMaAfguDcsFcUWL8Rk=; b=Mb9CiMFzQhE8UaB3MqUEMANsLB w7CYR3Ufar4ak1FdkoIivZ3Fc/zu9nXm9mIerO9vfMg8mr/qvPCYD4y8/+rVo6OsH2RiK1NhKgpY6 0BwZ8Aq1bhmjDLhFnZ8q1hpjSDMYYWyvMhJbI/NpXCZ6wRCXAl/lUTERqlJXQr4fyU13JzN16zBSz x1cO7m01mj1u3y9ZqspRS1vFSckqNtxqr/zk2J4gyVJkMJXFfUb4NcV2zM3eqEeJYn62gcSO1CEgx NN8U6tnZ1P3X6B3C4qoMfRea4blyDAwmTjpL1IQUUQj5OgHvsr+QBht3R08oMTAHV12w+qAgv3xVc fy8YrRcA==; Received: from [2001:8b0:10b:1::3ae] (helo=u3832b3a9db3152.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nHPja-00Dm5D-1P; Tue, 08 Feb 2022 12:36:38 +0000 Message-ID: Subject: Re: [PATCH RFC 15/39] KVM: x86/xen: handle PV spinlocks slowpath From: David Woodhouse To: Joao Martins , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, metikaya@amazon.co.uk Cc: Ankur Arora , Boris Ostrovsky , Paolo Bonzini , Radim =?UTF-8?Q?Kr=C4=8Dm=C3=A1=C5=99?= , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , x86@kernel.org Date: Tue, 08 Feb 2022 12:36:33 +0000 In-Reply-To: <20190220201609.28290-16-joao.m.martins@oracle.com> References: <20190220201609.28290-1-joao.m.martins@oracle.com> <20190220201609.28290-16-joao.m.martins@oracle.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-OCGc/NiGfWit24U4It7O" User-Agent: Evolution 3.36.5-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-OCGc/NiGfWit24U4It7O Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2019-02-20 at 20:15 +0000, Joao Martins wrote: > From: Boris Ostrovsky >=20 > Add support for SCHEDOP_poll hypercall. >=20 > This implementation is optimized for polling for a single channel, which > is what Linux does. Polling for multiple channels is not especially > efficient (and has not been tested). >=20 > PV spinlocks slow path uses this hypercall, and explicitly crash if it's > not supported. >=20 > Signed-off-by: Boris Ostrovsky > --- ... > +static void kvm_xen_check_poller(struct kvm_vcpu *vcpu, int port) > +{ > + struct kvm_vcpu_xen *vcpu_xen =3D vcpu_to_xen_vcpu(vcpu); > + > + if ((vcpu_xen->poll_evtchn =3D=3D port || > + vcpu_xen->poll_evtchn =3D=3D -1) && > + test_and_clear_bit(vcpu->vcpu_id, vcpu->kvm->arch.xen.poll_ma= sk)) > + wake_up(&vcpu_xen->sched_waitq); > +} ... > + if (sched_poll.nr_ports =3D=3D 1) > + vcpu_xen->poll_evtchn =3D port; > + else > + vcpu_xen->poll_evtchn =3D -1; > + > + if (!wait_pending_event(vcpu, sched_poll.nr_ports, ports)) > + wait_event_interruptible_timeout( > + vcpu_xen->sched_waitq, > + wait_pending_event(vcpu, sched_poll.nr_ports, ports), > + sched_poll.timeout ?: KTIME_MAX); Hm, this doesn't wake on other interrupts, does it? I think it should. Shouldn't it basically be like HLT, with an additional wakeup when the listed ports are triggered even when they're masked? At https://git.infradead.org/users/dwmw2/linux.git/commitdiff/ddfbdf1af I've tried to make it use kvm_vcpu_halt(), and kvm_xen_check_poller() sets KVM_REQ_UNBLOCK when an event is delivered to a monitored port. I haven't quite got it to work yet, but does it seem like a sane approach? + if (!wait_pending_event(vcpu, sched_poll.nr_ports, ports)) { + vcpu->arch.mp_state =3D KVM_MP_STATE_HALTED; + kvm_vcpu_halt(vcpu); --=-OCGc/NiGfWit24U4It7O 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 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