From nobody Tue Nov 26 14:47:17 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1706193814058870.134111131227; Thu, 25 Jan 2024 06:43:34 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rT0wD-0001cH-NC; Thu, 25 Jan 2024 09:42:42 -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 1rT0wA-0001c6-J3; Thu, 25 Jan 2024 09:42:38 -0500 Received: from mail.ozlabs.org ([2404:9400:2221:ea00::3] helo=gandalf.ozlabs.org) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rT0w7-0008Qz-VC; Thu, 25 Jan 2024 09:42:37 -0500 Received: from gandalf.ozlabs.org (gandalf.ozlabs.org [150.107.74.76]) by gandalf.ozlabs.org (Postfix) with ESMTP id 4TLNpB6LQjz4wdB; Fri, 26 Jan 2024 01:42:26 +1100 (AEDT) Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mail.ozlabs.org (Postfix) with ESMTPSA id 4TLNp86RmFz4wc6; Fri, 26 Jan 2024 01:42:24 +1100 (AEDT) From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , Jing Liu , Alex Williamson Subject: [PATCH] vfio/pci: Clear MSI-X IRQ index always Date: Thu, 25 Jan 2024 15:42:20 +0100 Message-ID: <20240125144220.770725-1-clg@redhat.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2404:9400:2221:ea00::3; envelope-from=SRS0=OPgD=JD=redhat.com=clg@ozlabs.org; helo=gandalf.ozlabs.org X-Spam_score_int: -39 X-Spam_score: -4.0 X-Spam_bar: ---- X-Spam_report: (-4.0 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1706193816137100003 When doing device assignment of a physical device, MSI-X can be enabled with no vectors enabled and this sets the IRQ index to VFIO_PCI_MSIX_IRQ_INDEX. However, when MSI-X is disabled, the IRQ index is left untouched if no vectors are in use. Then, when INTx is enabled, the IRQ index value is considered incompatible (set to MSI-X) and VFIO_DEVICE_SET_IRQS fails. QEMU complains with : qemu-system-x86_64: vfio 0000:08:00.0: Failed to set up TRIGGER eventfd sig= naling for interrupt INTX-0: VFIO_DEVICE_SET_IRQS failure: Invalid argument To avoid that, unconditionaly clear the IRQ index when MSI-X is disabled. Buglink: https://issues.redhat.com/browse/RHEL-21293 Fixes: 5ebffa4e87e7 ("vfio/pci: use an invalid fd to enable MSI-X") Cc: Jing Liu Cc: Alex Williamson Signed-off-by: C=C3=A9dric Le Goater Reviewed-by: Alex Williamson --- hw/vfio/pci.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index d7fe06715c4b9cde66a68c31aaf405315921b0d6..4fa387f0430d62ca2ba1b5ae5b7= 037f8f06b33f9 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -826,9 +826,11 @@ static void vfio_msix_disable(VFIOPCIDevice *vdev) } } =20 - if (vdev->nr_vectors) { - vfio_disable_irqindex(&vdev->vbasedev, VFIO_PCI_MSIX_IRQ_INDEX); - } + /* + * Always clear MSI-X IRQ index. A PF device could have enabled + * MSI-X with no vectors. See vfio_msix_enable(). + */ + vfio_disable_irqindex(&vdev->vbasedev, VFIO_PCI_MSIX_IRQ_INDEX); =20 vfio_msi_disable_common(vdev); vfio_intx_enable(vdev, &err); --=20 2.43.0