From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f197.google.com (mail-pf0-f197.google.com [209.85.192.197]) by kanga.kvack.org (Postfix) with ESMTP id 9DA1A6B002A for ; Mon, 5 Mar 2018 11:26:31 -0500 (EST) Received: by mail-pf0-f197.google.com with SMTP id h193so9984218pfe.14 for ; Mon, 05 Mar 2018 08:26:31 -0800 (PST) Received: from mga01.intel.com (mga01.intel.com. [192.55.52.88]) by mx.google.com with ESMTPS id j13si8542257pgv.110.2018.03.05.08.26.30 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 05 Mar 2018 08:26:30 -0800 (PST) From: "Kirill A. Shutemov" Subject: [RFC, PATCH 19/22] x86/mm: Implement free_encrypt_page() Date: Mon, 5 Mar 2018 19:26:07 +0300 Message-Id: <20180305162610.37510-20-kirill.shutemov@linux.intel.com> In-Reply-To: <20180305162610.37510-1-kirill.shutemov@linux.intel.com> References: <20180305162610.37510-1-kirill.shutemov@linux.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: Ingo Molnar , x86@kernel.org, Thomas Gleixner , "H. Peter Anvin" , Tom Lendacky Cc: Dave Hansen , Kai Huang , linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Kirill A. Shutemov" As on allocation of encrypted page, we need to flush cache before returning page to free pool. Failing to do this may lead to data corruption. Signed-off-by: Kirill A. Shutemov --- arch/x86/mm/mktme.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/x86/mm/mktme.c b/arch/x86/mm/mktme.c index 1129ad25b22a..ef0eb1eb8d6e 100644 --- a/arch/x86/mm/mktme.c +++ b/arch/x86/mm/mktme.c @@ -45,6 +45,19 @@ void prep_encrypt_page(struct page *page, gfp_t gfp, unsigned int order) WARN_ONCE(gfp & __GFP_ZERO, "__GFP_ZERO is useless for encrypted pages"); } +void free_encrypt_page(struct page *page, int keyid, unsigned int order) +{ + int i; + void *v; + + for (i = 0; i < (1 << order); i++) { + v = kmap_atomic_keyid(page, keyid + i); + /* See comment in prep_encrypt_page() */ + clflush_cache_range(v, PAGE_SIZE); + kunmap_atomic(v); + } +} + struct page *__alloc_zeroed_encrypted_user_highpage(gfp_t gfp, struct vm_area_struct *vma, unsigned long vaddr) { -- 2.16.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org