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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AFAF7C6FA91 for ; Thu, 22 Sep 2022 17:16:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229740AbiIVRQO (ORCPT ); Thu, 22 Sep 2022 13:16:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46016 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231960AbiIVRPz (ORCPT ); Thu, 22 Sep 2022 13:15:55 -0400 Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0146F267A; Thu, 22 Sep 2022 10:15:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1663866937; x=1695402937; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=RZlp1H2OsjXwhzzSjzzWVpctKJLOlloT8euGikMJFHM=; b=biIPUgJxGAHggXeEp2S8kM0xOA79muhQaNsIWCY3OzDbNQry/R3WdXjj VfMK7Lii6ZapTJxHPQ20pTR0CYy8nRd35uNpfEQ5plNmHRqWTJtYG4iEy JoTsDm8huwN1poAO1MLnQZekK74DA2vYV+LMdx6RxnWJ+5tYtWHiAFGz9 B+S6mqUVU+GCQPA12bJaSdQS9V6i+UqJHX4wzsIvjXKFhE7fZLnD8kckV VUaRXOQLgrxcOPoR8f1ENUHkHiPgMJJtXQcxwCcu0cHkC7wWxNsneGuzS fL/XGt6IhRBWAPfVL815dtbR0SSJGAAlnuNlu/+mQFEmHKIILRPCLHdpn w==; X-IronPort-AV: E=McAfee;i="6500,9779,10478"; a="364351968" X-IronPort-AV: E=Sophos;i="5.93,337,1654585200"; d="scan'208";a="364351968" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Sep 2022 10:11:46 -0700 X-IronPort-AV: E=Sophos;i="5.93,337,1654585200"; d="scan'208";a="762270101" Received: from sknaidu-mobl1.amr.corp.intel.com (HELO kcaccard-desk.amr.corp.intel.com) ([10.212.165.187]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Sep 2022 10:11:27 -0700 From: Kristen Carlson Accardi To: linux-kernel@vger.kernel.org, linux-sgx@vger.kernel.org, cgroups@vger.kernel.org, Jarkko Sakkinen , Dave Hansen , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" Cc: Kristen Carlson Accardi , Sean Christopherson Subject: [RFC PATCH 08/20] x86/sgx: Add EPC page flags to identify type of page Date: Thu, 22 Sep 2022 10:10:45 -0700 Message-Id: <20220922171057.1236139-9-kristen@linux.intel.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20220922171057.1236139-1-kristen@linux.intel.com> References: <20220922171057.1236139-1-kristen@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson Create new flags to help identify whether a page is an enclave page or a va page and save the page type when the page is recorded. Signed-off-by: Sean Christopherson Signed-off-by: Kristen Carlson Accardi Cc: Sean Christopherson --- arch/x86/kernel/cpu/sgx/encl.c | 6 +++--- arch/x86/kernel/cpu/sgx/ioctl.c | 4 ++-- arch/x86/kernel/cpu/sgx/main.c | 20 ++++++++++---------- arch/x86/kernel/cpu/sgx/sgx.h | 8 +++++++- 4 files changed, 22 insertions(+), 16 deletions(-) diff --git a/arch/x86/kernel/cpu/sgx/encl.c b/arch/x86/kernel/cpu/sgx/encl.c index ad611c06798f..672b302f3688 100644 --- a/arch/x86/kernel/cpu/sgx/encl.c +++ b/arch/x86/kernel/cpu/sgx/encl.c @@ -252,7 +252,7 @@ static struct sgx_encl_page *__sgx_encl_load_page(struct sgx_encl *encl, epc_page = sgx_encl_eldu(&encl->secs, NULL); if (IS_ERR(epc_page)) return ERR_CAST(epc_page); - sgx_record_epc_page(epc_page, 0); + sgx_record_epc_page(epc_page, SGX_EPC_PAGE_ENCLAVE); } epc_page = sgx_encl_eldu(entry, encl->secs.epc_page); @@ -260,7 +260,7 @@ static struct sgx_encl_page *__sgx_encl_load_page(struct sgx_encl *encl, return ERR_CAST(epc_page); encl->secs_child_cnt++; - sgx_record_epc_page(entry->epc_page, SGX_EPC_PAGE_RECLAIMER_TRACKED); + sgx_record_epc_page(entry->epc_page, SGX_EPC_PAGE_ENCLAVE_RECLAIMABLE); return entry; } @@ -1221,7 +1221,7 @@ struct sgx_epc_page *sgx_alloc_va_page(struct sgx_encl *encl, bool reclaim) sgx_encl_free_epc_page(epc_page); return ERR_PTR(-EFAULT); } - sgx_record_epc_page(epc_page, 0); + sgx_record_epc_page(epc_page, SGX_EPC_PAGE_VERSION_ARRAY); epc_page->owner = encl; diff --git a/arch/x86/kernel/cpu/sgx/ioctl.c b/arch/x86/kernel/cpu/sgx/ioctl.c index aca80a3f38a1..c91cc6a01232 100644 --- a/arch/x86/kernel/cpu/sgx/ioctl.c +++ b/arch/x86/kernel/cpu/sgx/ioctl.c @@ -114,7 +114,7 @@ static int sgx_encl_create(struct sgx_encl *encl, struct sgx_secs *secs) encl->attributes = secs->attributes; encl->attributes_mask = SGX_ATTR_DEBUG | SGX_ATTR_MODE64BIT | SGX_ATTR_KSS; - sgx_record_epc_page(encl->secs.epc_page, 0); + sgx_record_epc_page(encl->secs.epc_page, SGX_EPC_PAGE_ENCLAVE); /* Set only after completion, as encl->lock has not been taken. */ set_bit(SGX_ENCL_CREATED, &encl->flags); @@ -325,7 +325,7 @@ static int sgx_encl_add_page(struct sgx_encl *encl, unsigned long src, goto err_out; } - sgx_record_epc_page(encl_page->epc_page, SGX_EPC_PAGE_RECLAIMER_TRACKED); + sgx_record_epc_page(encl_page->epc_page, SGX_EPC_PAGE_ENCLAVE_RECLAIMABLE); mutex_unlock(&encl->lock); mmap_read_unlock(current->mm); return ret; diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c index 085c06fdc359..3c0d33b72896 100644 --- a/arch/x86/kernel/cpu/sgx/main.c +++ b/arch/x86/kernel/cpu/sgx/main.c @@ -304,6 +304,8 @@ static void sgx_reclaim_pages(void) epc_page = list_first_entry(&sgx_global_lru.reclaimable, struct sgx_epc_page, list); encl_page = epc_page->owner; + if (WARN_ON_ONCE(!(epc_page->flags & SGX_EPC_PAGE_ENCLAVE))) + continue; if (kref_get_unless_zero(&encl_page->encl->refcount) != 0) { epc_page->flags |= SGX_EPC_PAGE_RECLAIM_IN_PROGRESS; @@ -360,8 +362,7 @@ static void sgx_reclaim_pages(void) sgx_reclaimer_write(epc_page, &backing[i++]); kref_put(&encl_page->encl->refcount, sgx_encl_release); - epc_page->flags &= ~(SGX_EPC_PAGE_RECLAIMER_TRACKED | - SGX_EPC_PAGE_RECLAIM_IN_PROGRESS); + epc_page->flags &= ~SGX_EPC_PAGE_RECLAIM_FLAGS; sgx_free_epc_page(epc_page); } @@ -496,6 +497,7 @@ struct sgx_epc_page *__sgx_alloc_epc_page(void) /** * sgx_record_epc_page() - Add a page to the LRU tracking * @page: EPC page + * @flags: Reclaim flags for the page. * * Mark a page with the specified flags and add it to the appropriate * (un)reclaimable list. @@ -525,18 +527,16 @@ void sgx_record_epc_page(struct sgx_epc_page *page, unsigned long flags) int sgx_drop_epc_page(struct sgx_epc_page *page) { spin_lock(&sgx_global_lru.lock); - if (page->flags & SGX_EPC_PAGE_RECLAIMER_TRACKED) { - /* The page is being reclaimed. */ - if (page->flags & SGX_EPC_PAGE_RECLAIM_IN_PROGRESS) { - spin_unlock(&sgx_global_lru.lock); - return -EBUSY; - } - - page->flags &= ~SGX_EPC_PAGE_RECLAIMER_TRACKED; + if ((page->flags & SGX_EPC_PAGE_RECLAIMER_TRACKED) && + (page->flags & SGX_EPC_PAGE_RECLAIM_IN_PROGRESS)) { + spin_unlock(&sgx_global_lru.lock); + return -EBUSY; } list_del(&page->list); spin_unlock(&sgx_global_lru.lock); + page->flags &= ~SGX_EPC_PAGE_RECLAIM_FLAGS; + return 0; } diff --git a/arch/x86/kernel/cpu/sgx/sgx.h b/arch/x86/kernel/cpu/sgx/sgx.h index 284d0cda9e36..76eae4ecbf87 100644 --- a/arch/x86/kernel/cpu/sgx/sgx.h +++ b/arch/x86/kernel/cpu/sgx/sgx.h @@ -31,8 +31,14 @@ /* page flag to indicate reclaim is in progress */ #define SGX_EPC_PAGE_RECLAIM_IN_PROGRESS BIT(2) +#define SGX_EPC_PAGE_ENCLAVE BIT(3) +#define SGX_EPC_PAGE_VERSION_ARRAY BIT(4) +#define SGX_EPC_PAGE_ENCLAVE_RECLAIMABLE (SGX_EPC_PAGE_ENCLAVE | \ + SGX_EPC_PAGE_RECLAIMER_TRACKED) #define SGX_EPC_PAGE_RECLAIM_FLAGS (SGX_EPC_PAGE_RECLAIMER_TRACKED | \ - SGX_EPC_PAGE_RECLAIM_IN_PROGRESS) + SGX_EPC_PAGE_RECLAIM_IN_PROGRESS | \ + SGX_EPC_PAGE_ENCLAVE | \ + SGX_EPC_PAGE_VERSION_ARRAY) struct sgx_epc_page { unsigned int section; -- 2.37.3