From patchwork Tue Sep 26 09:31:21 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 726861 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 29A2FE7D274 for ; Tue, 26 Sep 2023 09:35:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234207AbjIZJfW (ORCPT ); Tue, 26 Sep 2023 05:35:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50108 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234114AbjIZJfT (ORCPT ); Tue, 26 Sep 2023 05:35:19 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 035FEF3; Tue, 26 Sep 2023 02:35:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1695720913; x=1727256913; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=bZj72hwk6aGVHqUfVsQNiXvoc1GB8ZJ+RY64a2dEVnk=; b=CsFHfwDjUPio3TMeQ2KS9igb5wWbW/08xnYhqcUybO0NggZHh19kwHyS zfDr9YI0ht/JkwU0sUIZkmzL/dz3nLYJkZ4wIc47evQ6z8tA2v1zhUc5t uOfB7Khf9qO5+w0fGR4A/6N+HDM9qkxrjpvJ+1M80GXqZVEZQ4QSNxm+m 30lC/HqCC9+K8kv6MZcJw/TNjs5E2YmweYPrjJQzuzW9y6o4fCzJfPmKz A6T2NGk1UwqBmYDlKdv2LIv1flPwHNfxsHTAMqY9KdR9CIbwb7ELoTalM Bp2FZgH+OggPdYuwpW4kUhQgVMGPOg50lLIjgbwIq+xeadLWGUVZcNihI A==; X-IronPort-AV: E=McAfee;i="6600,9927,10843"; a="412442921" X-IronPort-AV: E=Sophos;i="6.03,177,1694761200"; d="scan'208";a="412442921" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Sep 2023 02:31:27 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10843"; a="725373049" X-IronPort-AV: E=Sophos;i="6.03,177,1694761200"; d="scan'208";a="725373049" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by orsmga006.jf.intel.com with ESMTP; 26 Sep 2023 02:31:26 -0700 From: Yi Liu To: alex.williamson@redhat.com, jgg@nvidia.com, kevin.tian@intel.com, robin.murphy@arm.com, baolu.lu@linux.intel.com Cc: joro@8bytes.org, cohuck@redhat.com, eric.auger@redhat.com, nicolinc@nvidia.com, kvm@vger.kernel.org, mjrosato@linux.ibm.com, chao.p.peng@linux.intel.com, yi.l.liu@intel.com, yi.y.sun@linux.intel.com, peterx@redhat.com, jasowang@redhat.com, shameerali.kolothum.thodi@huawei.com, lulu@redhat.com, suravee.suthikulpanit@amd.com, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, zhenzhong.duan@intel.com, joao.m.martins@oracle.com Subject: [RFC 3/3] vfio/pci: Expose PCIe PASID capability to userspace Date: Tue, 26 Sep 2023 02:31:21 -0700 Message-Id: <20230926093121.18676-4-yi.l.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230926093121.18676-1-yi.l.liu@intel.com> References: <20230926093121.18676-1-yi.l.liu@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org This exposes PCIe PASID capability to userspace and where to emulate this capability if wants to further expose it to VM. And this only exposes PASID capability for devices which has PCIe PASID extended struture in its configuration space. While for VFs, userspace is still unable to see this capability as SR-IOV spec forbides VF to implement PASID capability extended structure. It is a TODO in future. Related discussion can be found in below links: https://lore.kernel.org/kvm/20200407095801.648b1371@w520.home/ https://lore.kernel.org/kvm/BL1PR11MB5271A60035EF591A5BE8AC878C01A@BL1PR11MB5271.namprd11.prod.outlook.com/ Signed-off-by: Yi Liu --- drivers/vfio/pci/vfio_pci_config.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c index 7e2e62ab0869..dfae5ad5ebc0 100644 --- a/drivers/vfio/pci/vfio_pci_config.c +++ b/drivers/vfio/pci/vfio_pci_config.c @@ -95,7 +95,7 @@ static const u16 pci_ext_cap_length[PCI_EXT_CAP_ID_MAX + 1] = { [PCI_EXT_CAP_ID_LTR] = PCI_EXT_CAP_LTR_SIZEOF, [PCI_EXT_CAP_ID_SECPCI] = 0, /* not yet */ [PCI_EXT_CAP_ID_PMUX] = 0, /* not yet */ - [PCI_EXT_CAP_ID_PASID] = 0, /* not yet */ + [PCI_EXT_CAP_ID_PASID] = PCI_EXT_CAP_PASID_SIZEOF, [PCI_EXT_CAP_ID_DVSEC] = 0xFF, };