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 0FD93C05027 for ; Thu, 2 Feb 2023 08:06:02 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pNUb6-0007pC-Mi; Thu, 02 Feb 2023 03:05:32 -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 1pNUb4-0007p1-8i for qemu-devel@nongnu.org; Thu, 02 Feb 2023 03:05:31 -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 1pNUb1-0004ba-2j for qemu-devel@nongnu.org; Thu, 02 Feb 2023 03:05:29 -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=3O1h4pbUCfZjJxageF80vcxvuNGjkEh9LQSJTXdH+gk=; b=Z3qvABEdpMlUo41TiYy1gHZEDm S0BRxwgdijxvfOYNOJ91gdlj5zlB2Y6+1GsL8B5qMcP2IxJWw6886qj6Mgkh7l1SwUvY2cqk3cUtx xiXzcH0qc0wTt/nrl836BfXfxLPt2kuu9978iftB8W57OX5Ya6xUuGWZM+i14+QMHUigwUgCP6Yp2 9qTiCTQ2G8/0sYOHY4ofpjloSFYAQ8dJZpQa9iEI/GSCIMfJ9mtzpnMG/Yki8azoxLqJquOD4uJAV 6e+ShS6j8JuMEg9JsKCWr2pCmeojsbCtsEjsVFgyLdvADE6TKK13NBON6qBiai/P5K9i6TIaZVF5j ESsVfdqA==; 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 1pNUab-00DCu7-R7; Thu, 02 Feb 2023 08:05:02 +0000 Message-ID: Subject: Re: [SeaBIOS] [SeaBIOS PATCH] xen: require Xen info structure at 0x1000 to detect Xen From: David Woodhouse To: Kevin O'Connor , Gerd Hoffmann Cc: seabios , xen-devel , qemu-devel , paul Date: Thu, 02 Feb 2023 08:05:01 +0000 In-Reply-To: References: Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-sroW6G48O+5dXLLiahn3" 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+067b40b933c07ef79d88+7102+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 --=-sroW6G48O+5dXLLiahn3 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2023-02-01 at 21:13 -0500, Kevin O'Connor wrote: > On Fri, Jan 20, 2023 at 11:33:19AM +0000, David Woodhouse wrote: > > From: David Woodhouse > >=20 > > When running under Xen, hvmloader places a table at 0x1000 with the e82= 0 > > information and BIOS tables. If this isn't present, SeaBIOS will=20 > > currently panic. > >=20 > > We now have support for running Xen guests natively in QEMU/KVM, which > > boots SeaBIOS directly instead of via hvmloader, and does not provide > > the same structure. > >=20 > > As it happens, this doesn't matter on first boot. because although we > > set PlatformRunningOn to PF_QEMU|PF_XEN, reading it back again still > > gives zero. Presumably because in true Xen, this is all already RAM. Bu= t > > in QEMU with a faithfully-emulated PAM config in the host bridge, it's > > still in ROM mode at this point so we don't see what we've just written= . > >=20 > > On reboot, however, the region *is* set to RAM mode and we do see the > > updated value of PlatformRunningOn, do manage to remember that we've > > detected Xen in CPUID, and hit the panic. > >=20 > > It's not trivial to detect QEMU vs. real Xen at the time xen_preinit() > > runs, because it's so early. We can't even make a XENVER_extraversion > > hypercall to look for hints, because we haven't set up the hypercall > > page (and don't have an allocator to give us a page in which to do so). > >=20 > > So just make Xen detection contingent on the info structure being > > present. If it wasn't, we were going to panic anyway. That leaves us > > taking the standard QEMU init path for Xen guests in native QEMU, > > which is just fine. >=20 > Thanks.=C2=A0 I committed this change. >=20 > -Kevin Thanks, Kevin. I'd like to get the rest of the Xen platform support in to qemu 8.0 if possible. Which is currently scheduled for March. Is there likely to be a SeaBIOS release before then which Gerd would pull into qemu anyway, or should I submit a submodule update to a snapshot of today's tree? That would just pull in this commit, and the one other fix that's in the SeaBIOS tree since 1.16.1? $ git shortlog rel-1.16.1.. 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