From patchwork Thu Apr 21 11:03:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhang, Cathy" X-Patchwork-Id: 12821472 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 76788C433F5 for ; Thu, 21 Apr 2022 11:05:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239906AbiDULIe (ORCPT ); Thu, 21 Apr 2022 07:08:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45514 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1388734AbiDULHg (ORCPT ); Thu, 21 Apr 2022 07:07:36 -0400 Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A561E2F03B for ; Thu, 21 Apr 2022 04:04:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1650539076; x=1682075076; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=lzF76dr5OyhgznlKi7kBwEA0d9lnZNetuc+LqiEoC00=; b=Y7TmFABYrHbf7K7vkjBPbSl7/d8gGI/h0w4eBgZ3e0oobgeqv7uvtd37 unPvSYDcbjnhbWLvpIlWVZjQKSJwzfmwBCcshQzKGWYw9wngEs9CF5YR/ nBrUpvwdrLbBlTAtkAsWmf6dGinOzCAKaDlJNVd1JNvaG/ObNekRHg8Rn iWFHBWeEQIcUIDq9pz4Qn4aswDTKmQo44G8K15fMkD3QfRtRGiPbkJOze /Hq3RKeghGLXNTV3LT9qu9fUSouvYDvJT4+KUDx2U8/rXL1zCsCT9ldiJ QnFnROKv5fZQjAulkmmlXUglZF7bfdaRHsXLJttm+7iv6Ihh6eIBQ9cA9 A==; X-IronPort-AV: E=McAfee;i="6400,9594,10323"; a="244893370" X-IronPort-AV: E=Sophos;i="5.90,278,1643702400"; d="scan'208";a="244893370" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Apr 2022 04:04:24 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.90,278,1643702400"; d="scan'208";a="703039124" Received: from cathy-vostro-3670.bj.intel.com ([10.238.156.128]) by fmsmga001.fm.intel.com with ESMTP; 21 Apr 2022 04:04:21 -0700 From: Cathy Zhang To: linux-sgx@vger.kernel.org, x86@kernel.org Cc: jarkko@kernel.org, reinette.chatre@intel.com, dave.hansen@intel.com, ashok.raj@intel.com, cathy.zhang@intel.com, chao.p.peng@intel.com, yang.zhong@intel.com Subject: [PATCH v4 2/9] x86/sgx: Save enclave pointer for VA page Date: Thu, 21 Apr 2022 19:03:19 +0800 Message-Id: <20220421110326.856-3-cathy.zhang@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220421110326.856-1-cathy.zhang@intel.com> References: <20220421110326.856-1-cathy.zhang@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org Tearing down all enclaves is required by SGX SVN update, which involves running the ENCLS[EREMOVE] instruction on every EPC page. This (tearing down all enclaves) should be coordinated with any enclaves that may be in the process of existing and thus already be running ENCLS[EREMOVE] as part of enclave release. In support of this coordination, it is required to know which enclave owns each in-use EPC page. It is already possible to locate the owning enclave of SECS and regular pages but not for VA pages. Make the following changes for VA pages' location: 1) Make epc->owner type-agnostic by changing its type to 'void *'. So, besides "struct sgx_encl_page", it can have other types, like "struct sgx_va_page". 2) Save the enclave pointer for each VA page to support locating its owning enclave. Note: to track 2T EPC memory, this scheme of tracking will use additional 8M memory. Signed-off-by: Cathy Zhang --- Changes since v3: - Squash patch "x86/sgx: Provide VA page non-NULL owner" and "x86/sgx: Save enclave pointer for VA page". Update commit log. (Suggested by Jarkko Sakkinen) --- arch/x86/kernel/cpu/sgx/encl.h | 4 ++-- arch/x86/kernel/cpu/sgx/sgx.h | 2 +- arch/x86/kernel/cpu/sgx/encl.c | 5 +++-- arch/x86/kernel/cpu/sgx/ioctl.c | 3 ++- 4 files changed, 8 insertions(+), 6 deletions(-) diff --git a/arch/x86/kernel/cpu/sgx/encl.h b/arch/x86/kernel/cpu/sgx/encl.h index 7cdc351bc273..59fbd4ed5c64 100644 --- a/arch/x86/kernel/cpu/sgx/encl.h +++ b/arch/x86/kernel/cpu/sgx/encl.h @@ -76,6 +76,7 @@ struct sgx_va_page { struct sgx_epc_page *epc_page; DECLARE_BITMAP(slots, SGX_VA_SLOT_COUNT); struct list_head list; + struct sgx_encl *encl; }; struct sgx_backing { @@ -112,8 +113,7 @@ int sgx_encl_get_backing(struct sgx_encl *encl, unsigned long page_index, void sgx_encl_put_backing(struct sgx_backing *backing, bool do_write); int sgx_encl_test_and_clear_young(struct mm_struct *mm, struct sgx_encl_page *page); - -struct sgx_epc_page *sgx_alloc_va_page(void); +struct sgx_epc_page *sgx_alloc_va_page(struct sgx_va_page *va_page); unsigned int sgx_alloc_va_slot(struct sgx_va_page *va_page); void sgx_free_va_slot(struct sgx_va_page *va_page, unsigned int offset); bool sgx_va_page_full(struct sgx_va_page *va_page); diff --git a/arch/x86/kernel/cpu/sgx/sgx.h b/arch/x86/kernel/cpu/sgx/sgx.h index d7a1490d90bb..f8ed9deac18b 100644 --- a/arch/x86/kernel/cpu/sgx/sgx.h +++ b/arch/x86/kernel/cpu/sgx/sgx.h @@ -33,7 +33,7 @@ struct sgx_epc_page { unsigned int section; u16 flags; u16 poison; - struct sgx_encl_page *owner; + void *owner; struct list_head list; }; diff --git a/arch/x86/kernel/cpu/sgx/encl.c b/arch/x86/kernel/cpu/sgx/encl.c index 68c8d65a8dee..c0725111cc25 100644 --- a/arch/x86/kernel/cpu/sgx/encl.c +++ b/arch/x86/kernel/cpu/sgx/encl.c @@ -753,6 +753,7 @@ int sgx_encl_test_and_clear_young(struct mm_struct *mm, /** * sgx_alloc_va_page() - Allocate a Version Array (VA) page + * @va_page: struct sgx_va_page connected to this VA page * * Allocate a free EPC page and convert it to a Version Array (VA) page. * @@ -760,12 +761,12 @@ int sgx_encl_test_and_clear_young(struct mm_struct *mm, * a VA page, * -errno otherwise */ -struct sgx_epc_page *sgx_alloc_va_page(void) +struct sgx_epc_page *sgx_alloc_va_page(struct sgx_va_page *va_page) { struct sgx_epc_page *epc_page; int ret; - epc_page = sgx_alloc_epc_page(NULL, true); + epc_page = sgx_alloc_epc_page(va_page, true); if (IS_ERR(epc_page)) return ERR_CAST(epc_page); diff --git a/arch/x86/kernel/cpu/sgx/ioctl.c b/arch/x86/kernel/cpu/sgx/ioctl.c index a4df72f715d7..b77343eb2d49 100644 --- a/arch/x86/kernel/cpu/sgx/ioctl.c +++ b/arch/x86/kernel/cpu/sgx/ioctl.c @@ -30,7 +30,8 @@ static struct sgx_va_page *sgx_encl_grow(struct sgx_encl *encl) if (!va_page) return ERR_PTR(-ENOMEM); - va_page->epc_page = sgx_alloc_va_page(); + va_page->encl = encl; + va_page->epc_page = sgx_alloc_va_page(va_page); if (IS_ERR(va_page->epc_page)) { err = ERR_CAST(va_page->epc_page); kfree(va_page);