From nobody Mon Feb 9 05:20:25 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1697732527706990.2390234547171; Thu, 19 Oct 2023 09:22:07 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.619524.964739 (Exim 4.92) (envelope-from ) id 1qtVmI-000305-9O; Thu, 19 Oct 2023 16:21:42 +0000 Received: by outflank-mailman (output) from mailman id 619524.964739; Thu, 19 Oct 2023 16:21:42 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qtVmI-0002zy-6U; Thu, 19 Oct 2023 16:21:42 +0000 Received: by outflank-mailman (input) for mailman id 619524; Thu, 19 Oct 2023 16:21:41 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qtVmH-0002zq-8W for xen-devel@lists.xenproject.org; Thu, 19 Oct 2023 16:21:41 +0000 Received: from casper.infradead.org (casper.infradead.org [2001:8b0:10b:1236::1]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 936ca045-6e9b-11ee-9b0e-b553b5be7939; Thu, 19 Oct 2023 18:21:37 +0200 (CEST) Received: from [2001:8b0:10b:5:583b:153f:ff9:f813] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qtVmA-0081qO-LG; Thu, 19 Oct 2023 16:21:34 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version 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" X-Inumbo-ID: 936ca045-6e9b-11ee-9b0e-b553b5be7939 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:Date:Cc:To: From:Subject:Message-ID:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:In-Reply-To:References; bh=8/aCv9ZvI17YL8PRWe77kWCnwdWP8QE7b1K0f1aRw9M=; b=T0+Uqjj2wl7h6PtyV7BLUeHTEn sQMxM4qOnd+jVKg9Kjr8AKEpGF6wQmivHDuwC4AB883Uuplm5wh6OCKpHQnJPYiE3jFQwEQgxxfVu +9Cz7XQQTycItZ3RKufDu+4c4AHfcYDGQll+r1coQGH/cdmDKKPvrrCefBWR45Idi9hZ5JgDYeehH MhI5U8W98VI3owqpb8p7vLfcAto90/l6myXIU04f7Q2HS4NiFuoKk7plbAFdmQBx8F+BELTDYFnZY D5UDem0r5F1Dn9BYcswGjuUaRh9Y3Mo1Ogoyf4X5KeKwaOFL/mpB04X6iVNs56vRQl3X/QDJNZSR1 ezKNRwtw==; Message-ID: Subject: [PATCH] ns16550c: avoid crash in ns16550_endboot in PV shim mode From: David Woodhouse To: xen-devel@lists.xenproject.org Cc: Andrew Cooper , George Dunlap , Jan Beulich , Julien Grall , Stefano Stabellini , Wei Liu Date: Thu, 19 Oct 2023 17:21:33 +0100 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-IB4aNmT/qGBPAd3gX8/a" 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 X-Zoho-Virus-Status: 1 X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1697732528900100001 --=-IB4aNmT/qGBPAd3gX8/a Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: David Woodhouse In shim mode there is no hardware_domain. Dereferencing the pointer doesn't end well. Signed-off-by: David Woodhouse --- This is about as far as I got in my abortive attempt to use the PV shim without an actual PV console being provided by the HVM hosting environment. It still doesn't pass the guest's console through to serial; that only seems to shim to an actual PV console. xen/drivers/char/ns16550.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/xen/drivers/char/ns16550.c b/xen/drivers/char/ns16550.c index 28ddedd50d..0818f5578c 100644 --- a/xen/drivers/char/ns16550.c +++ b/xen/drivers/char/ns16550.c @@ -586,6 +586,8 @@ static void __init cf_check ns16550_endboot(struct seri= al_port *port) =20 if ( uart->remapped_io_base ) return; + if (!hardware_domain) + return; rv =3D ioports_deny_access(hardware_domain, uart->io_base, uart->io_ba= se + 7); if ( rv !=3D 0 ) BUG(); --=20 2.34.1 --=-IB4aNmT/qGBPAd3gX8/a Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG 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