From patchwork Tue Nov 29 04:25:43 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Xu X-Patchwork-Id: 9450917 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A275360710 for ; Tue, 29 Nov 2016 04:27:33 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9E79F27F46 for ; Tue, 29 Nov 2016 04:27:33 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9355727F95; Tue, 29 Nov 2016 04:27:33 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4D74C27F46 for ; Tue, 29 Nov 2016 04:27:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752654AbcK2E1b (ORCPT ); Mon, 28 Nov 2016 23:27:31 -0500 Received: from mx1.redhat.com ([209.132.183.28]:36822 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753352AbcK2E11 (ORCPT ); Mon, 28 Nov 2016 23:27:27 -0500 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 417343B70D; Tue, 29 Nov 2016 04:27:27 +0000 (UTC) Received: from pxdev.xzpeter.org (vpn1-7-237.pek2.redhat.com [10.72.7.237]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id uAT4PrdQ015727; Mon, 28 Nov 2016 23:27:23 -0500 From: Peter Xu To: kvm@vger.kernel.org Cc: drjones@redhat.com, agordeev@redhat.com, jan.kiszka@web.de, rkrcmar@redhat.com, pbonzini@redhat.com, peterx@redhat.com Subject: [PATCH v7 07/14] vm/page: provide PGDIR_OFFSET() macro Date: Tue, 29 Nov 2016 12:25:43 +0800 Message-Id: <1480393550-12385-8-git-send-email-peterx@redhat.com> In-Reply-To: <1480393550-12385-1-git-send-email-peterx@redhat.com> References: <1480393550-12385-1-git-send-email-peterx@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Tue, 29 Nov 2016 04:27:27 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This can be used in further patches. Reviewed-by: Andrew Jones Signed-off-by: Peter Xu --- lib/x86/asm/page.h | 3 +++ lib/x86/vm.c | 4 ++-- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/lib/x86/asm/page.h b/lib/x86/asm/page.h index 5044a49..c43bab2 100644 --- a/lib/x86/asm/page.h +++ b/lib/x86/asm/page.h @@ -41,5 +41,8 @@ #define PGDIR_MASK 1023 #endif +#define PGDIR_BITS(lvl) (((lvl) - 1) * PGDIR_WIDTH + PAGE_SHIFT) +#define PGDIR_OFFSET(va, lvl) (((va) >> PGDIR_BITS(lvl)) & PGDIR_MASK) + #endif /* !__ASSEMBLY__ */ #endif diff --git a/lib/x86/vm.c b/lib/x86/vm.c index f7e778b..cda4c5f 100644 --- a/lib/x86/vm.c +++ b/lib/x86/vm.c @@ -48,7 +48,7 @@ unsigned long *install_pte(unsigned long *cr3, unsigned offset; for (level = PAGE_LEVEL; level > pte_level; --level) { - offset = ((unsigned long)virt >> ((level-1) * PGDIR_WIDTH + 12)) & PGDIR_MASK; + offset = PGDIR_OFFSET((unsigned long)virt, level); if (!(pt[offset] & PT_PRESENT_MASK)) { unsigned long *new_pt = pt_page; if (!new_pt) @@ -60,7 +60,7 @@ unsigned long *install_pte(unsigned long *cr3, } pt = phys_to_virt(pt[offset] & PT_ADDR_MASK); } - offset = ((unsigned long)virt >> ((level-1) * PGDIR_WIDTH + 12)) & PGDIR_MASK; + offset = PGDIR_OFFSET((unsigned long)virt, level); pt[offset] = pte; return &pt[offset]; }