From patchwork Mon Oct 18 20:25:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Luck, Tony" X-Patchwork-Id: 12568009 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5EB6CC4167B for ; Mon, 18 Oct 2021 20:25:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 45B33610A1 for ; Mon, 18 Oct 2021 20:25:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233452AbhJRU2D (ORCPT ); Mon, 18 Oct 2021 16:28:03 -0400 Received: from mga02.intel.com ([134.134.136.20]:28506 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230298AbhJRU2C (ORCPT ); Mon, 18 Oct 2021 16:28:02 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10141"; a="215522866" X-IronPort-AV: E=Sophos;i="5.85,382,1624345200"; d="scan'208";a="215522866" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Oct 2021 13:25:50 -0700 X-IronPort-AV: E=Sophos;i="5.85,382,1624345200"; d="scan'208";a="493758179" Received: from agluck-desk2.sc.intel.com ([10.3.52.146]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Oct 2021 13:25:50 -0700 From: Tony Luck To: "Rafael J. Wysocki" , naoya.horiguchi@nec.com Cc: Andrew Morton , Sean Christopherson , Jarkko Sakkinen , Dave Hansen , Cathy Zhang , linux-sgx@vger.kernel.org, linux-acpi@vger.kernel.org, linux-mm@kvack.org, Tony Luck , Reinette Chatre Subject: [PATCH v10 3/7] x86/sgx: Initial poison handling for dirty and free pages Date: Mon, 18 Oct 2021 13:25:38 -0700 Message-Id: <20211018202542.584115-4-tony.luck@intel.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211018202542.584115-1-tony.luck@intel.com> References: <20211011185924.374213-1-tony.luck@intel.com> <20211018202542.584115-1-tony.luck@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org A memory controller patrol scrubber can report poison in a page that isn't currently being used. Add "poison" field in the sgx_epc_page that can be set for an sgx_epc_page. Check for it: 1) When sanitizing dirty pages 2) When freeing epc pages Poison is a new field separated from flags to avoid having to make all updates to flags atomic, or integrate poison state changes into some other locking scheme to protect flags (Currently just sgx_reclaimer_lock which protects the SGX_EPC_PAGE_RECLAIMER_TRACKED bit in page->flags). In both cases place the poisoned page on a per-node list of poisoned epc pages to make sure it will not be reallocated. Reviewed-by: Jarkko Sakkinen Tested-by: Reinette Chatre Signed-off-by: Tony Luck --- arch/x86/kernel/cpu/sgx/main.c | 26 +++++++++++++++++++++++++- arch/x86/kernel/cpu/sgx/sgx.h | 4 +++- 2 files changed, 28 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c index 5c02cffdabc8..e5fcb8354bcc 100644 --- a/arch/x86/kernel/cpu/sgx/main.c +++ b/arch/x86/kernel/cpu/sgx/main.c @@ -62,6 +62,24 @@ static void __sgx_sanitize_pages(struct list_head *dirty_page_list) page = list_first_entry(dirty_page_list, struct sgx_epc_page, list); + /* + * Checking page->poison without holding the node->lock + * is racy, but losing the race (i.e. poison is set just + * after the check) just means __eremove() will be uselessly + * called for a page that sgx_free_epc_page() will put onto + * the node->sgx_poison_page_list later. + */ + if (page->poison) { + struct sgx_epc_section *section = &sgx_epc_sections[page->section]; + struct sgx_numa_node *node = section->node; + + spin_lock(&node->lock); + list_move(&page->list, &node->sgx_poison_page_list); + spin_unlock(&node->lock); + + continue; + } + ret = __eremove(sgx_get_epc_virt_addr(page)); if (!ret) { /* @@ -626,7 +644,11 @@ void sgx_free_epc_page(struct sgx_epc_page *page) spin_lock(&node->lock); - list_add_tail(&page->list, &node->free_page_list); + page->owner = NULL; + if (page->poison) + list_add(&page->list, &node->sgx_poison_page_list); + else + list_add_tail(&page->list, &node->free_page_list); sgx_nr_free_pages++; page->flags = SGX_EPC_PAGE_IS_FREE; @@ -658,6 +680,7 @@ static bool __init sgx_setup_epc_section(u64 phys_addr, u64 size, section->pages[i].section = index; section->pages[i].flags = 0; section->pages[i].owner = NULL; + section->pages[i].poison = 0; list_add_tail(§ion->pages[i].list, &sgx_dirty_page_list); } @@ -724,6 +747,7 @@ static bool __init sgx_page_cache_init(void) if (!node_isset(nid, sgx_numa_mask)) { spin_lock_init(&sgx_numa_nodes[nid].lock); INIT_LIST_HEAD(&sgx_numa_nodes[nid].free_page_list); + INIT_LIST_HEAD(&sgx_numa_nodes[nid].sgx_poison_page_list); node_set(nid, sgx_numa_mask); } diff --git a/arch/x86/kernel/cpu/sgx/sgx.h b/arch/x86/kernel/cpu/sgx/sgx.h index 5906471156c5..9ec3136c7800 100644 --- a/arch/x86/kernel/cpu/sgx/sgx.h +++ b/arch/x86/kernel/cpu/sgx/sgx.h @@ -31,7 +31,8 @@ struct sgx_epc_page { unsigned int section; - unsigned int flags; + u16 flags; + u16 poison; struct sgx_encl_page *owner; struct list_head list; }; @@ -42,6 +43,7 @@ struct sgx_epc_page { */ struct sgx_numa_node { struct list_head free_page_list; + struct list_head sgx_poison_page_list; spinlock_t lock; };