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 D14CACD37B0 for ; Mon, 18 Sep 2023 16:28:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230173AbjIRQ2x (ORCPT ); Mon, 18 Sep 2023 12:28:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52676 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229918AbjIRQ2e (ORCPT ); Mon, 18 Sep 2023 12:28:34 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AF17C9012; Mon, 18 Sep 2023 09:20:40 -0700 (PDT) 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=p9PPZsf/2+s9/FRVu6LhnIuvnbHS3g8QgUS/xuCb6Eg=; b=ZOPa9xEcasYDjMUM4cpsWE2seY ingl8d0WYub0TuTMBM9K3J4tfnfL3WF/gIGRxrgl8UN1gseaOePPfF+aoh2czsv2u9NZc4y+iKYnV NeKsfriQDBbTQhhF6eNMuNgTyxkfsSjwhCJ/cfe8I6WffoMV0e3orvDVcSNMlPEnc/27AY+/GgO00 1NlhGgG+GXfTZs1yviRy8O9LyUm9M1BeyD7TzgE79zutOAw9oTTp6XclknBrKiRH50XlzXGKxSH8r Bqb9KyN0gUur56ZavOU0Evh92ifYHyfFwgDCn9sz2izWYHHfw4nLKrPvsWmHnCKwQLFVRdVqwou9A LtEIqlSg==; Received: from [2001:8b0:10b:5:7930:9714:474a:dcad] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qiGzE-00C0HS-BQ; Mon, 18 Sep 2023 16:20:36 +0000 Message-ID: Subject: Re: [PATCH v3 09/13] KVM: xen: automatically use the vcpu_info embedded in shared_info From: David Woodhouse To: paul@xen.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Paul Durrant , Sean Christopherson , Paolo Bonzini , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , x86@kernel.org Date: Mon, 18 Sep 2023 17:20:35 +0100 In-Reply-To: <7ff44cd2-c1a3-27a1-85cd-675320b4cf46@xen.org> References: <20230918144111.641369-1-paul@xen.org> <20230918144111.641369-10-paul@xen.org> <7ff44cd2-c1a3-27a1-85cd-675320b4cf46@xen.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-IWFL37iqLcyp6iIKmZU0" User-Agent: Evolution 3.44.4-0ubuntu2 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 --=-IWFL37iqLcyp6iIKmZU0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2023-09-18 at 17:15 +0100, Paul Durrant wrote: > > > +=C2=A0 Note that, if the guest sets an explicit vcpu_info location i= n guest > > > +=C2=A0 memory then the VMM is expected to copy the content of the st= ructure > > > +=C2=A0 embedded in the shared_info page to the new location. It is t= herefore > > > +=C2=A0 important that no event delivery is in progress at this time,= otherwise > > > +=C2=A0 events may be missed. > > >=20 > >=20 > > That's difficult. It means tearing down all interrupts from passthrough > > devices which are mapped via PIRQs, and also all IPIs. >=20 > So those don't honour event channel masking? That seems like a problem. Oh, *mask*. Sure, it does honour masking. But... that would mean the VMM has to keep track of which ports were *really* masked by the guest, and which ones were just masked for the switchover. Including if the guest does some mask/unmask activity *while* the switchover is happening (or locking to prevent such). I still don't think that's a kind thing to be telling the VMMs they need to do. > >=20 > > The IPI code *should* be able to fall back to just letting the VMM > > handle the hypercall in userspace. But PIRQs are harder. I'd be happier > > if our plan =E2=80=94 handwavy though it may be =E2=80=94 led to being = able to use the > > existing slow path for delivering interrupts by just *invalidating* the > > cache. Maybe we *should* move the memcpy into the kernel, and let it > > lock *both* the shinfo and new vcpu_info caches while it's doing the > > copy? Given that that's the only valid transition, that shouldn't be so > > hard, should it? > >=20 >=20 > No, it just kind of oversteps the remit of the attribute... but I'll try= =20 > adding it and see how messy it gets. Well, there's a reason I left all the vcpu_info address magic in userspace in the first place. It was there in Jo=C3=A3o's original patches and I ripped it all out. But I see your logic for wanting to put it back; I suspect moving the memcpy too is part of the cost of that? 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