From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EEBBFC4332F for ; Mon, 13 Nov 2023 11:09:57 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1r2UnL-0006Oa-Il; Mon, 13 Nov 2023 06:07:55 -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 1r2UnI-0006Nc-Jn for qemu-devel@nongnu.org; Mon, 13 Nov 2023 06:07:52 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1r2UnG-0001Gh-5t for qemu-devel@nongnu.org; Mon, 13 Nov 2023 06:07:52 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1699873668; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=GQtG9NtTnHgyTIqAeLRJ1Cqt+R0FDQoDmBEkUZJB2A0=; b=Et5lT3xOOEeGmTn9AspRIxILfmkcmIp6f3vMClPbfF0oQndHt3bQmls3cBaj8cm9ZjTt2B +DDQ6AaeT/lxwZDkXE+EwKNYfrxByM7UiLawT4Dp7sB8barASmffmiS6FUZlwp3YTxYEXS dzdm2AF/spFY+0dEWTt0CS1MK+JIT88= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-187-0WabfnXrNQ6joIN-zMwgIg-1; Mon, 13 Nov 2023 06:07:46 -0500 X-MC-Unique: 0WabfnXrNQ6joIN-zMwgIg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 5B6AF811E7E; Mon, 13 Nov 2023 11:07:46 +0000 (UTC) Received: from thuth-p1g4.redhat.com (unknown [10.39.192.105]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6B4BE2166B26; Mon, 13 Nov 2023 11:07:45 +0000 (UTC) From: Thomas Huth To: qemu-devel@nongnu.org Cc: Stefan Hajnoczi , Matthew Rosato Subject: [PULL 03/12] s390x/pci: only limit DMA aperture if vfio DMA limit reported Date: Mon, 13 Nov 2023 12:07:31 +0100 Message-ID: <20231113110740.38270-4-thuth@redhat.com> In-Reply-To: <20231113110740.38270-1-thuth@redhat.com> References: <20231113110740.38270-1-thuth@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.6 Received-SPF: pass client-ip=170.10.129.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Matthew Rosato If the host kernel lacks vfio DMA limit reporting, do not attempt to shrink the guest DMA aperture. Fixes: df202e3ff3 ("s390x/pci: shrink DMA aperture to be bound by vfio DMA limit") Signed-off-by: Matthew Rosato Message-ID: <20231110175108.465851-3-mjrosato@linux.ibm.com> Signed-off-by: Thomas Huth --- hw/s390x/s390-pci-vfio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/s390x/s390-pci-vfio.c b/hw/s390x/s390-pci-vfio.c index e28573b593..7dbbc76823 100644 --- a/hw/s390x/s390-pci-vfio.c +++ b/hw/s390x/s390-pci-vfio.c @@ -136,7 +136,7 @@ static void s390_pci_read_base(S390PCIBusDevice *pbdev, * to the guest based upon the vfio DMA limit. */ vfio_size = pbdev->iommu->max_dma_limit << TARGET_PAGE_BITS; - if (vfio_size < (cap->end_dma - cap->start_dma + 1)) { + if (vfio_size > 0 && vfio_size < cap->end_dma - cap->start_dma + 1) { pbdev->zpci_fn.edma = cap->start_dma + vfio_size - 1; } } -- 2.41.0