From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34680) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ej8DU-0004Db-BJ for qemu-devel@nongnu.org; Tue, 06 Feb 2018 13:43:41 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ej8DR-0003cY-Vb for qemu-devel@nongnu.org; Tue, 06 Feb 2018 13:43:40 -0500 Received: from mx1.redhat.com ([209.132.183.28]:42920) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ej8DR-0003ar-P7 for qemu-devel@nongnu.org; Tue, 06 Feb 2018 13:43:37 -0500 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 0BD6462644 for ; Tue, 6 Feb 2018 18:43:37 +0000 (UTC) From: Alex Williamson Date: Tue, 06 Feb 2018 11:43:36 -0700 Message-ID: <20180206184336.14644.80296.stgit@gimli.home> In-Reply-To: <20180206184101.14644.84734.stgit@gimli.home> References: <20180206184101.14644.84734.stgit@gimli.home> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Subject: [Qemu-devel] [PULL 06/11] vfio/pci: Emulate BARs List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org 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. Tested-by: Alexey Kardashevskiy Reviewed-by: Eric Auger Tested-by: Eric Auger 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 908b8dffca2b..9436ac5cc9ae 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -2777,6 +2777,8 @@ static void vfio_realize(PCIDevice *pdev, Error **errp) /* 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); /* * The PCI spec reserves vendor ID 0xffff as an invalid value. The