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 X-Spam-Level: X-Spam-Status: No, score=-12.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7C258C43461 for ; Thu, 10 Sep 2020 10:49:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 44E7F20C09 for ; Thu, 10 Sep 2020 10:49:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730201AbgIJKtp (ORCPT ); Thu, 10 Sep 2020 06:49:45 -0400 Received: from mga06.intel.com ([134.134.136.31]:21915 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729663AbgIJKrl (ORCPT ); Thu, 10 Sep 2020 06:47:41 -0400 IronPort-SDR: KehVBXhkYrGJd4FwDPek4qg/9PpEE9uL+ZF2m5UUyyggKrcSvo+R4vB+oHMI2/IFw5q+kBXBwa Sk3Kk4Dweccg== X-IronPort-AV: E=McAfee;i="6000,8403,9739"; a="220066294" X-IronPort-AV: E=Sophos;i="5.76,412,1592895600"; d="scan'208";a="220066294" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Sep 2020 03:43:35 -0700 IronPort-SDR: AJSAoAe8J/v4IYsTisio5eeg99esw7VnpbfAIX6Ns8DQro0L+nV+BqlMIhxKWm2LXBdcg4ZTqy dFUUNZVJQ2Gg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.76,412,1592895600"; d="scan'208";a="334137222" Received: from jacob-builder.jf.intel.com ([10.7.199.155]) by orsmga008.jf.intel.com with ESMTP; 10 Sep 2020 03:43:35 -0700 From: Liu Yi L To: alex.williamson@redhat.com, eric.auger@redhat.com, baolu.lu@linux.intel.com, joro@8bytes.org Cc: kevin.tian@intel.com, jacob.jun.pan@linux.intel.com, ashok.raj@intel.com, yi.l.liu@intel.com, jun.j.tian@intel.com, yi.y.sun@intel.com, jean-philippe@linaro.org, peterx@redhat.com, jasowang@redhat.com, hao.wu@intel.com, stefanha@gmail.com, iommu@lists.linux-foundation.org, kvm@vger.kernel.org Subject: [PATCH v7 15/16] iommu/vt-d: Only support nesting when nesting caps are consistent across iommu units Date: Thu, 10 Sep 2020 03:45:32 -0700 Message-Id: <1599734733-6431-16-git-send-email-yi.l.liu@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1599734733-6431-1-git-send-email-yi.l.liu@intel.com> References: <1599734733-6431-1-git-send-email-yi.l.liu@intel.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This patch makes change to only supports the case where all the physical iommu units have the same CAP/ECAP MASKS for nested translation. Cc: Kevin Tian CC: Jacob Pan Cc: Alex Williamson Cc: Eric Auger Cc: Jean-Philippe Brucker Cc: Joerg Roedel Cc: Lu Baolu Signed-off-by: Liu Yi L Signed-off-by: Jacob Pan --- v6 - > v7: *) added per comment from Eric. https://lore.kernel.org/kvm/7fe337fa-abbc-82be-c8e8-b9e2a6179b90@redhat.com/ --- drivers/iommu/intel/iommu.c | 8 ++++++-- include/linux/intel-iommu.h | 16 ++++++++++++++++ 2 files changed, 22 insertions(+), 2 deletions(-) diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 95740b9..38c6c9b 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -5675,12 +5675,16 @@ static inline bool iommu_pasid_support(void) static inline bool nested_mode_support(void) { struct dmar_drhd_unit *drhd; - struct intel_iommu *iommu; + struct intel_iommu *iommu, *prev = NULL; bool ret = true; rcu_read_lock(); for_each_active_iommu(iommu, drhd) { - if (!sm_supported(iommu) || !ecap_nest(iommu->ecap)) { + if (!prev) + prev = iommu; + if (!sm_supported(iommu) || !ecap_nest(iommu->ecap) || + (VTD_CAP_MASK & (iommu->cap ^ prev->cap)) || + (VTD_ECAP_MASK & (iommu->ecap ^ prev->ecap))) { ret = false; break; } diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h index db7fc59..e7b7512 100644 --- a/include/linux/intel-iommu.h +++ b/include/linux/intel-iommu.h @@ -197,6 +197,22 @@ #define ecap_max_handle_mask(e) ((e >> 20) & 0xf) #define ecap_sc_support(e) ((e >> 7) & 0x1) /* Snooping Control */ +/* Nesting Support Capability Alignment */ +#define VTD_CAP_FL1GP BIT_ULL(56) +#define VTD_CAP_FL5LP BIT_ULL(60) +#define VTD_ECAP_PRS BIT_ULL(29) +#define VTD_ECAP_ERS BIT_ULL(30) +#define VTD_ECAP_SRS BIT_ULL(31) +#define VTD_ECAP_EAFS BIT_ULL(34) +#define VTD_ECAP_PASID BIT_ULL(40) + +/* Only capabilities marked in below MASKs are reported */ +#define VTD_CAP_MASK (VTD_CAP_FL1GP | VTD_CAP_FL5LP) + +#define VTD_ECAP_MASK (VTD_ECAP_PRS | VTD_ECAP_ERS | \ + VTD_ECAP_SRS | VTD_ECAP_EAFS | \ + VTD_ECAP_PASID) + /* Virtual command interface capability */ #define vccap_pasid(v) (((v) & DMA_VCS_PAS)) /* PASID allocation */ -- 2.7.4