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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 25F9ECCA47C for ; Thu, 2 Jun 2022 10:30:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233845AbiFBKao (ORCPT ); Thu, 2 Jun 2022 06:30:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38796 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233860AbiFBKak (ORCPT ); Thu, 2 Jun 2022 06:30:40 -0400 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CB99869CEA; Thu, 2 Jun 2022 03:30:26 -0700 (PDT) Received: from pps.filterd (m0098417.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 2528huZ8026615; Thu, 2 Jun 2022 10:30:22 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=M1zvcLMG92FcPS3g1DuhwhZILf+zrGpIaNaaLno10YU=; b=RpWABqtmkAwy6aJG7fJiNfz9QkUXMbXPy3nO2JZPFuMmK00FDtGufUPJDaV6/0QH27iU N27tLffnNup/uRTSsrmc9ElqTHiOA+OErYIzfPr7mEvJEZMHzx8b2VBa1DNjSgkYDXaQ zqJKgJfuaKhQm6Tvxq+qrFh7q5mKXjFvP1Cp5OpVotvrTFgRhaTbwKfxotTp9D+vKfS1 qfij27IM2N50wmGo5rB26sOeyxfSDbJD5x1YcYkjHAs4tWipdAG6s2nnG2wdfFZjBfUk 2vn7zwVRBxWoT0GMvLgVOZ/uDu2zGOKIB4J8oiaYl6gUAeUyKgkVAW7MSneIwh3b0SGj BA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3gesxvhsk2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 02 Jun 2022 10:30:22 +0000 Received: from m0098417.ppops.net (m0098417.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 252A01v8000403; Thu, 2 Jun 2022 10:30:22 GMT Received: from ppma06ams.nl.ibm.com (66.31.33a9.ip4.static.sl-reverse.com [169.51.49.102]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3gesxvhsjk-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 02 Jun 2022 10:30:22 +0000 Received: from pps.filterd (ppma06ams.nl.ibm.com [127.0.0.1]) by ppma06ams.nl.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 252AK6Ge030075; Thu, 2 Jun 2022 10:30:20 GMT Received: from b06avi18878370.portsmouth.uk.ibm.com (b06avi18878370.portsmouth.uk.ibm.com [9.149.26.194]) by ppma06ams.nl.ibm.com with ESMTP id 3gdnetthcw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 02 Jun 2022 10:30:20 +0000 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 252AUHKo17432940 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 2 Jun 2022 10:30:17 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 417CFA4040; Thu, 2 Jun 2022 10:30:17 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 106F6A405F; Thu, 2 Jun 2022 10:30:17 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 2 Jun 2022 10:30:17 +0000 (GMT) From: Niklas Schnelle To: Bjorn Helgaas , Jan Kiszka , Matthew Rosato , Pierre Morel Cc: linux-s390@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH RESEND v5 3/4] PCI: Extend isolated function probing to s390 Date: Thu, 2 Jun 2022 12:30:15 +0200 Message-Id: <20220602103016.1499031-4-schnelle@linux.ibm.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220602103016.1499031-1-schnelle@linux.ibm.com> References: <20220602103016.1499031-1-schnelle@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: Y5wpetDq_XbSXnADrqy6PhD8fyf54e2L X-Proofpoint-GUID: KYx-51UsDP7VI9oWe4WZ3X-XImq6BBGs X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.874,Hydra:6.0.517,FMLib:17.11.64.514 definitions=2022-06-02_01,2022-06-01_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 adultscore=0 mlxscore=0 priorityscore=1501 phishscore=0 lowpriorityscore=0 bulkscore=0 spamscore=0 mlxlogscore=712 impostorscore=0 clxscore=1015 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2204290000 definitions=main-2206020042 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Like the jailhouse hypervisor s390's PCI architecture allows passing isolated PCI functions to an OS instance. As of now this is was not utilized even with multi-function support as the s390 PCI code makes sure that only virtual PCI busses including a function with devfn 0 are presented to the PCI subsystem. A subsequent change will remove this restriction. Allow probing such functions by replacing the existing check for jailhouse_paravirt() with a new hypervisor_isolated_pci_functions() helper. Cc: Jan Kiszka Signed-off-by: Niklas Schnelle --- drivers/pci/probe.c | 2 +- include/linux/hypervisor.h | 8 ++++++++ 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 3029edc68ff7..4e27cc929095 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -2663,7 +2663,7 @@ int pci_scan_slot(struct pci_bus *bus, int devfn) * a hypervisor which passes through individual PCI * functions. */ - if (!jailhouse_paravirt()) + if (!hypervisor_isolated_pci_functions()) break; } fn = next_fn(bus, dev, fn); diff --git a/include/linux/hypervisor.h b/include/linux/hypervisor.h index fc08b433c856..33b1c0482aac 100644 --- a/include/linux/hypervisor.h +++ b/include/linux/hypervisor.h @@ -32,4 +32,12 @@ static inline bool jailhouse_paravirt(void) #endif /* !CONFIG_X86 */ +static inline bool hypervisor_isolated_pci_functions(void) +{ + if (IS_ENABLED(CONFIG_S390)) + return true; + else + return jailhouse_paravirt(); +} + #endif /* __LINUX_HYPEVISOR_H */ -- 2.32.0