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 2266AC678D4 for ; Wed, 1 Mar 2023 21:53:48 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pXUOH-0003xL-9G; Wed, 01 Mar 2023 16:53:37 -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 1pXUOG-0003wv-2I; Wed, 01 Mar 2023 16:53:36 -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 1pXUOD-0005sX-6g; Wed, 01 Mar 2023 16:53:35 -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=95EU4WS6Wt9f9+yEU535OWGfeVAyTsYY0/wPVBDs27Y=; b=As/XN+bmJ9LzOOoEdXCel0zYWo fitAE0mXVow5NQ1v0mqaecGNnCWIGtYQXumC9bnSIdRE/4CmYIXgvo0zvgEwWzjXlj526YmrH/oxV xzXpHTedENF72Bs12QGozjpn7ubx6Z6jC17wdW+FDPyL/b8biRxPWcPOnHzDLy2cLEkz/QwDbmDz5 RKQD/P/UNGc2oO0/5yQWMx/B2K/jn0G0zSZ+N5MnjWlelgg6KT0wlYfXZiplsb3DRDiKaUsBQDBzQ wzQMoDcpRtENlwZaXWMr9SH/MvdeFExuLGcDkc9Q77/Q5it5Cr337d0f/1AJN3k8st/OIvnPYpN56 QYUARUjw==; Received: from [2001:8b0:10b:5:d85e:b59b:a166:430c] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pXUO4-001udM-TG; Wed, 01 Mar 2023 21:53:25 +0000 Message-ID: Subject: Re: [PATCH v5 5/7] hw/isa/vt82c686: Work around missing level sensitive irq in i8259 model From: David Woodhouse To: BALATON Zoltan Cc: Bernhard Beschow , qemu-devel@nongnu.org, qemu-ppc@nongnu.org, Gerd Hoffmann , Daniel Henrique Barboza , Peter Maydell , philmd@linaro.org, ReneEngel80@emailn.de Date: Wed, 01 Mar 2023 21:53:23 +0000 In-Reply-To: <418dd5ca-cabc-fb91-6437-63bece1dfe1b@eik.bme.hu> References: <6502f6bd-029c-25a8-49ec-e61784c64db5@eik.bme.hu> <943866390436e3c8828fea3e8cec117ae8553887.camel@infradead.org> <1c9daa28-b4b0-5227-ea94-90035a8bed7a@eik.bme.hu> <859e28fd61203c35e30fce505f0101886a54e654.camel@infradead.org> <418dd5ca-cabc-fb91-6437-63bece1dfe1b@eik.bme.hu> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-K+LmH4pW2ms9EY3rVJmi" 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+f4e15e254fb7e3cd38fc+7129+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 --=-K+LmH4pW2ms9EY3rVJmi Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2023-03-01 at 19:01 +0100, BALATON Zoltan wrote: >=20 > > It isn't a *correct* fix without a little bit more typing, but does > > this make it work? > >=20 > > diff --git a/hw/intc/i8259.c b/hw/intc/i8259.c > > index 17910f3bcb..36ebcff025 100644 > > --- a/hw/intc/i8259.c > > +++ b/hw/intc/i8259.c > > @@ -246,6 +246,7 @@ static void pic_ioport_write(void *opaque, hwaddr a= ddr64, > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 if (val & 0x08) { > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 qemu_log_mask(LOG_UNIMP, > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 "i8259: level sensitive irq not suppor= ted\n"); > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 s->elcr =3D 0xff; >=20 > This works too. I guess the log can be then removed too. Could you submit= =20 > a proper patch or you want me to do that so we can drop the workaround fo= r=20 > it? Thanks for looking into it. Happy for you to do the rest of the typing ... :) So, *ideally* I think you need to introduce a new field in the PICCommonState which records the status of the LTIM bit.=C2=A0And fix up th= e vmstate_pic_common in hw/intc/i8259_common.c to save and restore that (with versioning for upgrade/downgrade). Then you find those places which currently check the bit for the specific pin in s->elcr, and make them something like: --- a/hw/intc/i8259.c +++ b/hw/intc/i8259.c @@ -133,7 +133,7 @@ static void pic_set_irq(void *opaque, int irq, int leve= l) } #endif =20 - if (s->elcr & mask) { + if (s->ltim || (s->elcr & mask)) { /* level triggered */ if (level) { s->irr |=3D mask; It *might* be that you should make the LTIM behaviour optional, so that only certain incarnations of the i8259 actually get it at all and it *wouldn't* take effect if a guest tried to set it, which is what the PIIX3 datasheet implies. 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