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 X-Spam-Level: X-Spam-Status: No, score=-7.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 155DCC56202 for ; Thu, 26 Nov 2020 17:29:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A923921D7F for ; Thu, 26 Nov 2020 17:29:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="3W6fIgwi" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404388AbgKZR3Y (ORCPT ); Thu, 26 Nov 2020 12:29:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37612 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404105AbgKZR3Y (ORCPT ); Thu, 26 Nov 2020 12:29:24 -0500 Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CFE8DC0613D4 for ; Thu, 26 Nov 2020 09:29:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.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=OgMaTWUFS55dFPTCisfTl6PNIp8wl+PlzJf8l5ucoIQ=; b=3W6fIgwi0vWeIuc6wsMyvZNEQo ievR3DEA899/LIwW+CtyWYHK1jO3escGaDZPuZlFHRTbbCdUy+vlWoHr3YSeERWpHbSq7J7mc6Ae5 HEKl/9/xmJ3MMC73o87DWubuGqYPNKITZ3o+xr+WPezGcCtBXGF74RzSOF55djbYPzAEZIYPK/E/N c6NdKaBapacOmvxOghZMaaC4ulouKOsnqve9mrwnmfiD7yTswf7CT/gA2/BbuS6TBhhNJn/VOkVhM +Wf7bZJUFJrwAsCY6DUShNtZS07yCdYBKQCG+gBYCgo9NtHaoxT/oG4g03Meh+WaULiZLRoe3aWYc oUZY9I5w==; Received: from 54-240-197-230.amazon.com ([54.240.197.230] helo=freeip.amazon.com) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiL55-0008Vv-22; Thu, 26 Nov 2020 17:29:19 +0000 Message-ID: <95c0c9a01ea9692b3b18ac677d7e7c6e7636bfe4.camel@infradead.org> Subject: Re: [RFC PATCH] Fix split-irqchip vs interrupt injection window request. From: David Woodhouse To: Sean Christopherson , Paolo Bonzini Cc: kvm , "Sironi, Filippo" , "Raslan, KarimAllah" , Matt Gingell , Steve Rutherford , liran@amazon.com Date: Thu, 26 Nov 2020 17:29:16 +0000 In-Reply-To: <99a9c1dfbb21744e5081d924291d3b09ab055813.camel@infradead.org> References: <62918f65ec78f8990278a6a0db0567968fa23e49.camel@infradead.org> <017de9019136b5d2ec34132b96b9f0273c21d6f1.camel@infradead.org> <20201125211955.GA450871@google.com> <99a9c1dfbb21744e5081d924291d3b09ab055813.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-Swt71QtmRKeR1YjO6yTz" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org --=-Swt71QtmRKeR1YjO6yTz Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2020-11-26 at 11:10 +0000, David Woodhouse wrote: >=20 > > whether or not there's an IRQ in the > > LAPIC should be irrelevant when deciding to exit to userspace. Note, t= he > > reinjection check covers vcpu->arch.interrupt.injected for the case whe= re LAPIC > > is in userspace. > >=20 > > return kvm_arch_interrupt_allowed(vcpu) && > > (!lapic_in_kernel(vcpu) || !kvm_cpu_has_extint(vcpu)) && > > !kvm_event_needs_reinjection(vcpu) && > > kvm_cpu_accept_dm_intr(vcpu); > > } >=20 > Makes sense. I'm putting this version through some testing and will > post it later... Hm, that survived enough test iterations to persuade me to post it, but then seems to have fallen over later. I'm reverting to the kvm_cpu_has_injectable_intr() version to leave that one running too and be sure it's gone in that. Without either patch it's 100% repeatable, and will happen as soon as the 'noapic' guest enabled lapic timer interrupts. I'm not sure I see why your version would simply make it less frequent... --=-Swt71QtmRKeR1YjO6yTz Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTkwMTAyMDAwMDAwWhcNMjIwMTAxMjM1 OTU5WjAkMSIwIAYJKoZIhvcNAQkBFhNkd213MkBpbmZyYWRlYWQub3JnMIIBIjANBgkqhkiG9w0B AQEFAAOCAQ8AMIIBCgKCAQEAsv3wObLTCbUA7GJqKj9vHGf+Fa+tpkO+ZRVve9EpNsMsfXhvFpb8 RgL8vD+L133wK6csYoDU7zKiAo92FMUWaY1Hy6HqvVr9oevfTV3xhB5rQO1RHJoAfkvhy+wpjo7Q cXuzkOpibq2YurVStHAiGqAOMGMXhcVGqPuGhcVcVzVUjsvEzAV9Po9K2rpZ52FE4rDkpDK1pBK+ 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