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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 96653C282DD for ; Tue, 23 Apr 2019 23:29:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 632BB218DA for ; Tue, 23 Apr 2019 23:29:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729092AbfDWX3W (ORCPT ); Tue, 23 Apr 2019 19:29:22 -0400 Received: from mga09.intel.com ([134.134.136.24]:8108 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728888AbfDWX2n (ORCPT ); Tue, 23 Apr 2019 19:28:43 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 23 Apr 2019 16:28:39 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,387,1549958400"; d="scan'208";a="293981298" Received: from jacob-builder.jf.intel.com ([10.7.199.155]) by orsmga004.jf.intel.com with ESMTP; 23 Apr 2019 16:28:39 -0700 From: Jacob Pan To: iommu@lists.linux-foundation.org, LKML , Joerg Roedel , David Woodhouse , Eric Auger , Alex Williamson , Jean-Philippe Brucker Cc: "Yi Liu" , "Tian, Kevin" , Raj Ashok , "Christoph Hellwig" , "Lu Baolu" , Andriy Shevchenko , Jacob Pan Subject: [PATCH v2 14/19] iommu: Add guest PASID bind function Date: Tue, 23 Apr 2019 16:31:14 -0700 Message-Id: <1556062279-64135-15-git-send-email-jacob.jun.pan@linux.intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1556062279-64135-1-git-send-email-jacob.jun.pan@linux.intel.com> References: <1556062279-64135-1-git-send-email-jacob.jun.pan@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Guest shared virtual address (SVA) may require host to shadow guest PASID tables. Guest PASID can also be allocated from the host via enlightened interfaces. In this case, guest needs to bind the guest mm, i.e. cr3 in guest phisical address to the actual PASID table in the host IOMMU. Nesting will be turned on such that guest virtual address can go through a two level translation: - 1st level translates GVA to GPA - 2nd level translates GPA to HPA This patch introduces APIs to bind guest PASID data to the assigned device entry in the physical IOMMU. See the diagram below for usage explaination. .-------------. .---------------------------. | vIOMMU | | Guest process mm, FL only | | | '---------------------------' .----------------/ | PASID Entry |--- PASID cache flush - '-------------' | | | V | | '-------------' Guest ------| Shadow |--------------------------|------------ v v v Host .-------------. .----------------------. | pIOMMU | | Bind FL for GVA-GPA | | | '----------------------' .----------------/ | | PASID Entry | V (Nested xlate) '----------------\.---------------------. | | |Set SL to GPA-HPA | | | '---------------------' '-------------' Where: - FL = First level/stage one page tables - SL = Second level/stage two page tables Signed-off-by: Jacob Pan Signed-off-by: Liu Yi L --- drivers/iommu/iommu.c | 20 ++++++++++++++++++++ include/linux/iommu.h | 10 ++++++++++ include/uapi/linux/iommu.h | 15 ++++++++++++++- 3 files changed, 44 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 498c28a..072f8f3 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1561,6 +1561,26 @@ int iommu_cache_invalidate(struct iommu_domain *domain, struct device *dev, } EXPORT_SYMBOL_GPL(iommu_cache_invalidate); +int iommu_sva_bind_gpasid(struct iommu_domain *domain, + struct device *dev, struct gpasid_bind_data *data) +{ + if (unlikely(!domain->ops->sva_bind_gpasid)) + return -ENODEV; + + return domain->ops->sva_bind_gpasid(domain, dev, data); +} +EXPORT_SYMBOL_GPL(iommu_sva_bind_gpasid); + +int iommu_sva_unbind_gpasid(struct iommu_domain *domain, struct device *dev, + int pasid) +{ + if (unlikely(!domain->ops->sva_unbind_gpasid)) + return -ENODEV; + + return domain->ops->sva_unbind_gpasid(dev, pasid); +} +EXPORT_SYMBOL_GPL(iommu_sva_unbind_gpasid); + static void __iommu_detach_device(struct iommu_domain *domain, struct device *dev) { diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 4b92e4b..611388e 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -231,6 +231,8 @@ struct iommu_sva_ops { * @detach_pasid_table: detach the pasid table * @cache_invalidate: invalidate translation caches * @pgsize_bitmap: bitmap of all possible supported page sizes + * @sva_bind_gpasid: bind guest pasid and mm + * @sva_unbind_gpasid: unbind guest pasid and mm */ struct iommu_ops { bool (*capable)(enum iommu_cap); @@ -295,6 +297,10 @@ struct iommu_ops { int (*cache_invalidate)(struct iommu_domain *domain, struct device *dev, struct iommu_cache_invalidate_info *inv_info); + int (*sva_bind_gpasid)(struct iommu_domain *domain, + struct device *dev, struct gpasid_bind_data *data); + + int (*sva_unbind_gpasid)(struct device *dev, int pasid); unsigned long pgsize_bitmap; }; @@ -409,6 +415,10 @@ extern void iommu_detach_pasid_table(struct iommu_domain *domain); extern int iommu_cache_invalidate(struct iommu_domain *domain, struct device *dev, struct iommu_cache_invalidate_info *inv_info); +extern int iommu_sva_bind_gpasid(struct iommu_domain *domain, + struct device *dev, struct gpasid_bind_data *data); +extern int iommu_sva_unbind_gpasid(struct iommu_domain *domain, + struct device *dev, int pasid); extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev); extern struct iommu_domain *iommu_get_dma_domain(struct device *dev); extern int iommu_map(struct iommu_domain *domain, unsigned long iova, diff --git a/include/uapi/linux/iommu.h b/include/uapi/linux/iommu.h index 61a3fb7..5c95905 100644 --- a/include/uapi/linux/iommu.h +++ b/include/uapi/linux/iommu.h @@ -235,6 +235,19 @@ struct iommu_cache_invalidate_info { struct iommu_inv_addr_info addr_info; }; }; - +/** + * struct gpasid_bind_data - Information about device and guest PASID binding + * @gcr3: Guest CR3 value from guest mm + * @pasid: Process address space ID used for the guest mm + * @addr_width: Guest address width. Paging mode can also be derived. + */ +struct gpasid_bind_data { + __u64 gcr3; + __u32 pasid; + __u32 addr_width; + __u32 flags; +#define IOMMU_SVA_GPASID_SRE BIT(0) /* supervisor request */ + __u8 padding[4]; +}; #endif /* _UAPI_IOMMU_H */ -- 2.7.4