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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 390BAC48BE5 for ; Mon, 21 Jun 2021 12:03:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 13C59611C1 for ; Mon, 21 Jun 2021 12:03:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229837AbhFUMFR (ORCPT ); Mon, 21 Jun 2021 08:05:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53300 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229610AbhFUMFO (ORCPT ); Mon, 21 Jun 2021 08:05:14 -0400 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A328DC06175F for ; Mon, 21 Jun 2021 05:03:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Type:MIME-Version:References: Subject:Cc:To:From:Date:Message-ID:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:In-Reply-To; bh=nmzdcEfDE7u/mj5fAucSf7noshay6FEjmz00GaDT+jk=; b=NY3s0To1zeaLts3h+rxYvFUgjW rVdBeZMm79u8jMLXhn1lhPmHCbO9mZkAN0P/R/xFQNS3/L2+/EoyfHN3VnlUxRNpIVj249s1wLMSu xj4bKqvOCA0Yu6yvZCjm/pbMUp19F5XbCjXvytIqnuAoPzrIcAiWD+3zehBIeinJROeF7R89XVbmc Bf2YX5hoW7vzt7dl78wevN7vUuTY2rLyvVEMacyeZdYZJCtjhiIiuM2Awu7P5asHp/PoLpqOiiiVV lKCNMB+ak9H0XS1AAxF1rmzPCPl8kWuiph0JvIReschBQQiG4lHhu3ChjR6swFy/gKPV6h0/j9vrs OurymV8A==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1lvIdP-00AEJd-CU; Mon, 21 Jun 2021 12:02:42 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id A62C430059E; Mon, 21 Jun 2021 14:02:39 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id 1E22E235EE387; Mon, 21 Jun 2021 14:02:39 +0200 (CEST) Message-ID: <20210621120121.127655715@infradead.org> User-Agent: quilt/0.66 Date: Mon, 21 Jun 2021 13:12:42 +0200 From: Peter Zijlstra To: jpoimboe@redhat.com, tglx@linutronix.de Cc: linux-kernel@vger.kernel.org, peterz@infradead.org, joro@8bytes.org, boris.ostrovsky@oracle.com, jgross@suse.com, x86@kernel.org, mbenes@suse.com Subject: [RFC][PATCH 09/18] x86/xen: Make write_cr2() noinstr References: <20210621111233.344964031@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org vmlinux.o: warning: objtool: pv_ops[42]: native_write_cr2 vmlinux.o: warning: objtool: pv_ops[42]: xen_write_cr2 vmlinux.o: warning: objtool: exc_nmi()+0x127: call to pv_ops[42]() leaves .noinstr.text section Signed-off-by: Peter Zijlstra (Intel) --- arch/x86/include/asm/paravirt.h | 2 +- arch/x86/kernel/paravirt.c | 7 ++++++- arch/x86/xen/mmu_pv.c | 3 ++- 3 files changed, 9 insertions(+), 3 deletions(-) --- a/arch/x86/include/asm/paravirt.h +++ b/arch/x86/include/asm/paravirt.h @@ -140,7 +140,7 @@ static __always_inline unsigned long rea ALT_NOT(X86_FEATURE_XENPV)); } -static inline void write_cr2(unsigned long x) +static __always_inline void write_cr2(unsigned long x) { PVOP_VCALL1(mmu.write_cr2, x); } --- a/arch/x86/kernel/paravirt.c +++ b/arch/x86/kernel/paravirt.c @@ -243,6 +243,11 @@ static noinstr unsigned long pv_native_r return native_read_cr2(); } +static noinstr void pv_native_write_cr2(unsigned long val) +{ + native_write_cr2(val); +} + struct paravirt_patch_template pv_ops = { /* Cpu ops. */ .cpu.io_delay = native_io_delay, @@ -304,7 +309,7 @@ struct paravirt_patch_template pv_ops = #ifdef CONFIG_PARAVIRT_XXL .mmu.read_cr2 = __PV_IS_CALLEE_SAVE(pv_native_read_cr2), - .mmu.write_cr2 = native_write_cr2, + .mmu.write_cr2 = pv_native_write_cr2, .mmu.read_cr3 = __native_read_cr3, .mmu.write_cr3 = native_write_cr3, --- a/arch/x86/xen/mmu_pv.c +++ b/arch/x86/xen/mmu_pv.c @@ -1204,7 +1204,8 @@ static void __init xen_pagetable_init(vo xen_remap_memory(); xen_setup_mfn_list_list(); } -static void xen_write_cr2(unsigned long cr2) + +static noinstr void xen_write_cr2(unsigned long cr2) { this_cpu_read(xen_vcpu)->arch.cr2 = cr2; }