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=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 1AB8DC5519F for ; Fri, 20 Nov 2020 09:28:27 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1FDAB221FE for ; Fri, 20 Nov 2020 09:28:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1FDAB221FE Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=antioche.eu.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.31827.62542 (Exim 4.92) (envelope-from ) id 1kg2i8-0002qb-AS; Fri, 20 Nov 2020 09:28:08 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 31827.62542; Fri, 20 Nov 2020 09:28:08 +0000 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kg2i8-0002qU-7K; Fri, 20 Nov 2020 09:28:08 +0000 Received: by outflank-mailman (input) for mailman id 31827; Fri, 20 Nov 2020 09:28:07 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kg2i7-0002qP-1q for xen-devel@lists.xenproject.org; Fri, 20 Nov 2020 09:28:07 +0000 Received: from chassiron.antioche.eu.org (unknown [2001:41d0:fe9d:1101::1]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 917c5e88-468e-49d2-b1e4-16f5232f9364; Fri, 20 Nov 2020 09:28:05 +0000 (UTC) Received: from sandettie.soc.lip6.fr (82-64-3-41.subs.proxad.net [82.64.3.41]) by chassiron.antioche.eu.org (8.15.2/8.15.2) with ESMTPS id 0AK9RxsO020134 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=OK); Fri, 20 Nov 2020 10:28:00 +0100 (MET) Received: by sandettie.soc.lip6.fr (Postfix, from userid 373) id B84052E9CA8; Fri, 20 Nov 2020 10:27:54 +0100 (MET) Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kg2i7-0002qP-1q for xen-devel@lists.xenproject.org; Fri, 20 Nov 2020 09:28:07 +0000 X-Inumbo-ID: 917c5e88-468e-49d2-b1e4-16f5232f9364 Received: from chassiron.antioche.eu.org (unknown [2001:41d0:fe9d:1101::1]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 917c5e88-468e-49d2-b1e4-16f5232f9364; Fri, 20 Nov 2020 09:28:05 +0000 (UTC) Received: from sandettie.soc.lip6.fr (82-64-3-41.subs.proxad.net [82.64.3.41]) by chassiron.antioche.eu.org (8.15.2/8.15.2) with ESMTPS id 0AK9RxsO020134 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=OK); Fri, 20 Nov 2020 10:28:00 +0100 (MET) Received: by sandettie.soc.lip6.fr (Postfix, from userid 373) id B84052E9CA8; Fri, 20 Nov 2020 10:27:54 +0100 (MET) Date: Fri, 20 Nov 2020 10:27:54 +0100 From: Manuel Bouyer To: Jan Beulich Cc: Roger Pau =?iso-8859-1?Q?Monn=E9?= , xen-devel@lists.xenproject.org Subject: Re: NetBSD dom0 PVH: hardware interrupts stalls Message-ID: <20201120092754.GH1508@antioche.eu.org> References: <20201118143928.hvamuf7t7jycsrzb@Air-de-Roger> <20201119141915.igyb7djkw47rf2dt@Air-de-Roger> <20201119155718.GB4104@antioche.eu.org> <20201119165734.GA4903@antioche.eu.org> <20201119175733.GA6067@antioche.eu.org> <1a50e1e2-b69c-afd6-a179-316231512004@suse.com> <20201120082855.5z4cibcd5djlwmgp@Air-de-Roger> <20201120085249.GA1508@antioche.eu.org> <97f371a9-00fe-33fe-8923-c247f44f9af6@suse.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <97f371a9-00fe-33fe-8923-c247f44f9af6@suse.com> X-Greylist: Sender succeeded STARTTLS authentication, not delayed by milter-greylist-4.4.3 (chassiron.antioche.eu.org [151.127.5.145]); Fri, 20 Nov 2020 10:28:01 +0100 (MET) On Fri, Nov 20, 2020 at 09:59:57AM +0100, Jan Beulich wrote: > Well, anything coming through the LAPIC needs ack-ing (except for > the spurious interrupt of course), or else ISR won't get updated > and further interrupts at this or lower priority can't be serviced > (delivered) anymore. This includes interrupts originally coming > through the IO-APIC. But the same constraint / requirement exists > on baremetal. OK, so even if I didn't see where this happens, it's happening. Is it what's Xen is using as ACK from the dom0 for a IOAPIC interrupt, or is it something else (at the IOAPIC level) ? -- Manuel Bouyer NetBSD: 26 ans d'experience feront toujours la difference --