From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f199.google.com (mail-pf0-f199.google.com [209.85.192.199]) by kanga.kvack.org (Postfix) with ESMTP id D21C86B0271 for ; Tue, 17 Jul 2018 07:21:51 -0400 (EDT) Received: by mail-pf0-f199.google.com with SMTP id n17-v6so186143pff.17 for ; Tue, 17 Jul 2018 04:21:51 -0700 (PDT) Received: from mga03.intel.com (mga03.intel.com. [134.134.136.65]) by mx.google.com with ESMTPS id d191-v6si673317pga.192.2018.07.17.04.21.50 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 17 Jul 2018 04:21:50 -0700 (PDT) From: "Kirill A. Shutemov" Subject: [PATCHv5 11/19] x86/mm: Implement vma_keyid() Date: Tue, 17 Jul 2018 14:20:21 +0300 Message-Id: <20180717112029.42378-12-kirill.shutemov@linux.intel.com> In-Reply-To: <20180717112029.42378-1-kirill.shutemov@linux.intel.com> References: <20180717112029.42378-1-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 , Jacob Pan , linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Kirill A. Shutemov" We store KeyID in upper bits for vm_page_prot that match position of KeyID in PTE. vma_keyid() extracts KeyID from vm_page_prot. With KeyID in vm_page_prot we don't need to modify any page table helper to propagate the KeyID to page table entires. Signed-off-by: Kirill A. Shutemov --- arch/x86/include/asm/mktme.h | 5 +++++ arch/x86/mm/mktme.c | 12 ++++++++++++ 2 files changed, 17 insertions(+) diff --git a/arch/x86/include/asm/mktme.h b/arch/x86/include/asm/mktme.h index 7266494b4f0a..f0b7844e36a4 100644 --- a/arch/x86/include/asm/mktme.h +++ b/arch/x86/include/asm/mktme.h @@ -4,6 +4,8 @@ #include #include +struct vm_area_struct; + #ifdef CONFIG_X86_INTEL_MKTME extern phys_addr_t mktme_keyid_mask; extern int mktme_nr_keyids; @@ -14,6 +16,9 @@ extern struct page_ext_operations page_mktme_ops; #define page_keyid page_keyid int page_keyid(const struct page *page); +#define vma_keyid vma_keyid +int vma_keyid(struct vm_area_struct *vma); + #else #define mktme_keyid_mask ((phys_addr_t)0) #define mktme_nr_keyids 0 diff --git a/arch/x86/mm/mktme.c b/arch/x86/mm/mktme.c index 09cbff678b9f..a1f40ee61b25 100644 --- a/arch/x86/mm/mktme.c +++ b/arch/x86/mm/mktme.c @@ -1,3 +1,4 @@ +#include #include phys_addr_t mktme_keyid_mask; @@ -37,3 +38,14 @@ struct page_ext_operations page_mktme_ops = { .need = need_page_mktme, .init = init_page_mktme, }; + +int vma_keyid(struct vm_area_struct *vma) +{ + pgprotval_t prot; + + if (!mktme_enabled()) + return 0; + + prot = pgprot_val(vma->vm_page_prot); + return (prot & mktme_keyid_mask) >> mktme_keyid_shift; +} -- 2.18.0