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 X-Spam-Level: X-Spam-Status: No, score=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C652FC433DF for ; Sat, 15 Aug 2020 21:44:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B0A1823B45 for ; Sat, 15 Aug 2020 21:44:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727779AbgHOVoC (ORCPT ); Sat, 15 Aug 2020 17:44:02 -0400 Received: from mx2.suse.de ([195.135.220.15]:55000 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726710AbgHOVnt (ORCPT ); Sat, 15 Aug 2020 17:43:49 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 3634FB04F; Sat, 15 Aug 2020 10:07:11 +0000 (UTC) From: Juergen Gross To: xen-devel@lists.xenproject.org, x86@kernel.org, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org Cc: Juergen Gross , Deep Shah , "VMware, Inc." , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" Subject: [PATCH v4 6/6] x86/paravirt: avoid needless paravirt step clearing page table entries Date: Sat, 15 Aug 2020 12:06:41 +0200 Message-Id: <20200815100641.26362-7-jgross@suse.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200815100641.26362-1-jgross@suse.com> References: <20200815100641.26362-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org pte_clear() et al are based on tw0 paravirt steps today: one step to create a page table entry with all zeroes, and one step to write this entry value. Drop the first step as it is completely useless. Signed-off-by: Juergen Gross --- arch/x86/include/asm/paravirt.h | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h index f0464b88ea1e..d25cc6830e89 100644 --- a/arch/x86/include/asm/paravirt.h +++ b/arch/x86/include/asm/paravirt.h @@ -448,7 +448,7 @@ static inline pudval_t pud_val(pud_t pud) static inline void pud_clear(pud_t *pudp) { - set_pud(pudp, __pud(0)); + set_pud(pudp, native_make_pud(0)); } static inline void set_p4d(p4d_t *p4dp, p4d_t p4d) @@ -485,15 +485,15 @@ static inline void __set_pgd(pgd_t *pgdp, pgd_t pgd) } while (0) #define pgd_clear(pgdp) do { \ - if (pgtable_l5_enabled()) \ - set_pgd(pgdp, __pgd(0)); \ + if (pgtable_l5_enabled()) \ + set_pgd(pgdp, native_make_pgd(0)); \ } while (0) #endif /* CONFIG_PGTABLE_LEVELS == 5 */ static inline void p4d_clear(p4d_t *p4dp) { - set_p4d(p4dp, __p4d(0)); + set_p4d(p4dp, native_make_p4d(0)); } static inline void set_pte_atomic(pte_t *ptep, pte_t pte) @@ -504,12 +504,12 @@ static inline void set_pte_atomic(pte_t *ptep, pte_t pte) static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { - set_pte(ptep, __pte(0)); + set_pte(ptep, native_make_pte(0)); } static inline void pmd_clear(pmd_t *pmdp) { - set_pmd(pmdp, __pmd(0)); + set_pmd(pmdp, native_make_pmd(0)); } #define __HAVE_ARCH_START_CONTEXT_SWITCH -- 2.26.2