From nobody Wed Feb 11 05:17:48 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1515611260669164.04439302614026; Wed, 10 Jan 2018 11:07:40 -0800 (PST) Received: from localhost ([::1]:60965 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eZLit-0008CA-Q9 for importer@patchew.org; Wed, 10 Jan 2018 14:07:39 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54960) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eZLdq-0004KS-Ed for qemu-devel@nongnu.org; Wed, 10 Jan 2018 14:02:27 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eZLdp-0003tb-NC for qemu-devel@nongnu.org; Wed, 10 Jan 2018 14:02:26 -0500 Received: from mx1.redhat.com ([209.132.183.28]:36730) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1eZLdp-0003rn-FT for qemu-devel@nongnu.org; Wed, 10 Jan 2018 14:02:25 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 79F4476541; Wed, 10 Jan 2018 19:02:19 +0000 (UTC) Received: from gimli.home (ovpn-116-14.phx2.redhat.com [10.3.116.14]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5692817125; Wed, 10 Jan 2018 19:02:13 +0000 (UTC) From: Alex Williamson To: qemu-devel@nongnu.org Date: Wed, 10 Jan 2018 12:02:13 -0700 Message-ID: <20180110190212.5389.67764.stgit@gimli.home> In-Reply-To: <20180110190049.5389.12984.stgit@gimli.home> References: <20180110190049.5389.12984.stgit@gimli.home> User-Agent: StGit/0.18 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Wed, 10 Jan 2018 19:02:24 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v2 3/5] vfio/pci: Emulate BARs X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: aik@ozlabs.ru, eric.auger@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 The kernel provides similar emulation of PCI BAR register access to QEMU, so up until now we've used that for things like BAR sizing and storing the BAR address. However, if we intend to resize BARs or add BARs that don't exist on the physical device, we need to switch to the pure QEMU emulation of the BAR. Signed-off-by: Alex Williamson --- hw/vfio/pci.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index 46f1e7ed9933..20252ea7aeb7 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -2773,6 +2773,8 @@ static void vfio_realize(PCIDevice *pdev, Error **err= p) =20 /* QEMU can choose to expose the ROM or not */ memset(vdev->emulated_config_bits + PCI_ROM_ADDRESS, 0xff, 4); + /* QEMU can also add or extend BARs */ + memset(vdev->emulated_config_bits + PCI_BASE_ADDRESS_0, 0xff, 6 * 4); =20 /* * The PCI spec reserves vendor ID 0xffff as an invalid value. The