From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54989) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dsaaU-0002zb-Gc for qemu-devel@nongnu.org; Thu, 14 Sep 2017 16:18:15 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dsaaR-0004X3-8v for qemu-devel@nongnu.org; Thu, 14 Sep 2017 16:18:14 -0400 Received: from mx1.redhat.com ([209.132.183.28]:15217) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dsaaR-0004Wa-37 for qemu-devel@nongnu.org; Thu, 14 Sep 2017 16:18:11 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D5101C047B65 for ; Thu, 14 Sep 2017 20:18:09 +0000 (UTC) From: Mohammed Gamal Date: Thu, 14 Sep 2017 22:17:27 +0200 Message-Id: <1505420247-23685-1-git-send-email-mgamal@redhat.com> Subject: [Qemu-devel] [PATCH] intel_iommu: Return error on machines with no PCI List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: pbonzini@redhat.com, ehabkost@redhat.com, mst@redhat.com, thuth@redhat.com, Mohammed Gamal Starting the following command line causes a segfault qemu-system-x86_64 -S -machine isapc,accel=kvm -device intel-iommu This is due to the fact that the machine type 'isapc' doesn't have a PCI bus, while intel_iommu doesn't check if the machine has PCI support and subsequently does a null-pointer access. Intel IOMMU shouldn't even work if the target machine doesn't have PCI. Add a check for PCI on the given machine type and return an error if PCI is not supported. Signed-off-by: Mohammed Gamal --- hw/i386/intel_iommu.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index 3a5bb0b..fab0b4b 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -3041,6 +3041,13 @@ static void vtd_realize(DeviceState *dev, Error **errp) } bus = pcms->bus; + + if (!bus) { + error_setg(errp, "Machine-type '%s' does not support PCI", + mc->name); + return; + } + x86_iommu->type = TYPE_INTEL; if (!vtd_decide_config(s, errp)) { -- 1.8.3.1