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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 36271C46467 for ; Wed, 11 Jan 2023 19:09:19 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pFgT7-0004KB-56; Wed, 11 Jan 2023 14:09:01 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pFgT4-0004Jy-S4 for qemu-devel@nongnu.org; Wed, 11 Jan 2023 14:08:58 -0500 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pFgT2-0000WO-2f for qemu-devel@nongnu.org; Wed, 11 Jan 2023 14:08:58 -0500 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=AIJOnKvqbbXLVbhUOA6Pz5uMbXzP73uJq311pyp3D58=; b=fMGGpdIXCu0sZPR8yRGQCKa76Q 9MhuCviSvkRq3AGO6BVI6omndTouWeg5r+1jAYWCf4AMHjLQjmTrpVmScjy7ZeWHMDnBS63ruTB6E N8QvnWUNfZPbhUfTVu36JiWK1QlDTwb6fz5AdHLNC8chLZPUPtd6whygXSGxogzbGS1O7qloKtpya BJJuN1sIy4ulwl7sTg/0uuqusyPZ4WBM0jZXx4UiZUGUoFn+JJiw8rokB8N3hVt2sy8XR0ziuUc9j OxTYCYEPPxyKuXGwmUCBNZE+PKIfNCsM4BQb2RCVuPQH40HBHSypkFH/yf5GMUqk2ePW69Qd0/37+ RDRA3C0g==; Received: from [2001:8b0:10b:5::bb3] (helo=u3832b3a9db3152.infradead.org) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pFgT4-004Oq7-5K; Wed, 11 Jan 2023 19:08:58 +0000 Message-ID: <458b3d6af1ad4e5e44e1eac0b05692805e32a070.camel@infradead.org> Subject: Re: [RFC] Notify IRQ sources of level interrupt ack/EOI From: David Woodhouse To: Alex Williamson Cc: "Michael S. Tsirkin" , qemu-devel@nongnu.org, Marcel Apfelbaum , Paolo Bonzini , Richard Henderson , Eduardo Habkost , Marcelo Tosatti , paul@xen.org Date: Wed, 11 Jan 2023 19:08:44 +0000 In-Reply-To: <20230111112947.22237481.alex.williamson@redhat.com> References: <23caafffdd9546b8eeff851660015f3bfc021ed3.camel@infradead.org> <20230111112425-mutt-send-email-mst@kernel.org> <70eb35a08a7c48993812b7f088fa9ae3f2c8b925.camel@infradead.org> <20230111112947.22237481.alex.williamson@redhat.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-NnjXikxs3L3OI1uLqoyM" User-Agent: Evolution 3.44.4-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+193d99197280eaff698e+7080+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-NnjXikxs3L3OI1uLqoyM Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2023-01-11 at 11:29 -0700, Alex Williamson wrote: >=20 > Nice.=C2=A0 IIRC, we ended up with the hack solution we have today in vfi= o > because there was too much resistance to callbacks that were only > necessary for vfio in the past.=C2=A0 Once we had KVM resampling support, > it simply wasn't worth the effort for a higher latency solution to > fight that battle, so we implemented what could best be described as > a universal workaround embedded in vfio. >=20 > Clearly a callback is preferable, and yes, that's how we operate with > KVM resampling and unmasking INTx, so in theory plumbing this to our > existing eoi callback and removing the region toggling ought to do > the right thing.=C2=A0 Thanks, Well, I'm happy for the Xen support be a second use case which means it's no longer "only necessary for VFIO", and keep prodding at it if that's going to be useful... --=-NnjXikxs3L3OI1uLqoyM Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 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