From nobody Mon Feb 9 23:40:19 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=pass; 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 ARC-Seal: i=1; a=rsa-sha256; t=1757365940; cv=none; d=zohomail.com; s=zohoarc; b=DSOvxmDQvGR2TRJigx3SaFHQf8UXa/xUXp9133LthhQq3N378jwNo/tHULB20hnGJ+74/yNNONaNSrQqT4iwma11zcB+F4K7MZsa6dr48wgmrDOSzrmyjFPFEIRIqTii5w5XtJ08fx7j1Jqd8oX130RIst30m281OBx5qPLu+kM= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1757365940; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=TefMi+8qYWJ3sWp2Jmhd2ppEtx/E0etNYFj1pW73ooo=; b=K7Q4qS0cG4sAyU98Bj7MIsDcPwK0oL0i80G+BohrxdvKxUlwsn1bBH0mwP5vYgo1A2dJ6Hs6vm02yDEr8UOAXClEZNrHuSAI8Wz47Yhaf983LYy1PVWcCBk/UBB7MiEPuACMSz0dj5AQrmOyvW0x2OTcmDwH2CNQGtSTt3dwXZA= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; 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 175736593996377.85490452289196; Mon, 8 Sep 2025 14:12:19 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.1115538.1462124 (Exim 4.92) (envelope-from ) id 1uvj9b-0000FT-AL; Mon, 08 Sep 2025 21:11:59 +0000 Received: by outflank-mailman (output) from mailman id 1115538.1462124; Mon, 08 Sep 2025 21:11:59 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uvj9b-0000FG-5Z; Mon, 08 Sep 2025 21:11:59 +0000 Received: by outflank-mailman (input) for mailman id 1115538; Mon, 08 Sep 2025 21:11:58 +0000 Received: from mail.xenproject.org ([104.130.215.37]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uvj9Z-0008QT-Um for xen-devel@lists.xenproject.org; Mon, 08 Sep 2025 21:11:57 +0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.96) (envelope-from ) id 1uvj9Z-000FT2-1m; Mon, 08 Sep 2025 21:11:57 +0000 Received: from [19.12.91.86] (helo=localhost) by xenbits.xenproject.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1uvj9Z-000gMD-1x; Mon, 08 Sep 2025 21:11:57 +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" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=xen.org; s=20200302mail; h=Content-Transfer-Encoding:MIME-Version:References: In-Reply-To:Message-ID:Date:Subject:Cc:To:From; bh=TefMi+8qYWJ3sWp2Jmhd2ppEtx/E0etNYFj1pW73ooo=; b=RMrlGjVZwWJhwisdIpfyGQezh/ j8FyprAHyc3RVkYgK75iO9XUlEb0qzIUafCBitw5W9uK7ove5z4B8g4I+/xloaXFZRIK3umNtUu+E +yxga2J46i5Km9ti7PzcwdCiKZq84Az/cyKeO9LM4mSWQid53qBKYoNulhHaA1gR4vSI=; From: dmukhin@xen.org To: xen-devel@lists.xenproject.org Cc: andrew.cooper3@citrix.com, anthony.perard@vates.tech, jbeulich@suse.com, julien@xen.org, michal.orzel@amd.com, roger.pau@citrix.com, sstabellini@kernel.org, dmukhin@ford.com Subject: [PATCH v7 05/16] emul/ns16x50: implement SCR register Date: Mon, 8 Sep 2025 14:11:38 -0700 Message-ID: <20250908211149.279143-6-dmukhin@ford.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250908211149.279143-1-dmukhin@ford.com> References: <20250908211149.279143-1-dmukhin@ford.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @xen.org) X-ZM-MESSAGEID: 1757365941411124100 Content-Type: text/plain; charset="utf-8" From: Denis Mukhin =20 Add SCR register emulation to the I/O port handler. Firmware (e.g. OVMF) may use SCR during the guest OS boot. Signed-off-by: Denis Mukhin Reviewed-by: Mykola Kvach --- Changes since v6: - default handling of non-DLL/DLM registers moved to the previous patch --- xen/common/emul/vuart/ns16x50.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/xen/common/emul/vuart/ns16x50.c b/xen/common/emul/vuart/ns16x5= 0.c index da8583a1dc93..5643ef4cc01e 100644 --- a/xen/common/emul/vuart/ns16x50.c +++ b/xen/common/emul/vuart/ns16x50.c @@ -106,6 +106,11 @@ static int ns16x50_io_write8( { switch ( reg ) { + /* NB: Firmware (e.g. OVMF) may rely on SCR presence. */ + case UART_SCR: + regs[UART_SCR] =3D val; + break; + default: rc =3D -EINVAL; break; @@ -177,6 +182,10 @@ static int ns16x50_io_read8( { switch ( reg ) { + case UART_SCR: + val =3D regs[UART_SCR]; + break; + default: rc =3D -EINVAL; break; --=20 2.51.0