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=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 12B47C432C3 for ; Tue, 19 Nov 2019 17:23:15 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 8F28822303 for ; Tue, 19 Nov 2019 17:23:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8F28822303 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=c-s.fr Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id C8C2E6B0003; Tue, 19 Nov 2019 12:23:13 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id C13EE6B0006; 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Tue, 19 Nov 2019 18:23:10 +0100 (CET) Received: from vm-hermes.si.c-s.fr (vm-hermes.si.c-s.fr [192.168.25.253]) by pegase1.c-s.fr (Postfix) with ESMTP id 47HXhs50M2z9tyLQ; Tue, 19 Nov 2019 18:23:09 +0100 (CET) Received: by vm-hermes.si.c-s.fr (Postfix, from userid 33) id A9FDCCCF; Tue, 19 Nov 2019 18:23:10 +0100 (CET) Received: from 37-173-93-145.coucou-networks.fr (37-173-93-145.coucou-networks.fr [37.173.93.145]) by messagerie.si.c-s.fr (Horde Framework) with HTTP; Tue, 19 Nov 2019 18:23:10 +0100 Date: Tue, 19 Nov 2019 18:23:10 +0100 Message-ID: <20191119182310.Horde.k9AYj80RSVXLkAUdXVQqrQ1@messagerie.si.c-s.fr> From: Christophe Leroy To: Michael Ellerman Cc: linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, dja@axtens.net, npiggin@gmail.com, Paul Mackerras , Benjamin Herrenschmidt Subject: Re: [PATCH v3 15/15] powerpc/32s: Activate CONFIG_VMAP_STACK References: <87v9rhcuc5.fsf@mpe.ellerman.id.au> In-Reply-To: <87v9rhcuc5.fsf@mpe.ellerman.id.au> User-Agent: Internet Messaging Program (IMP) H5 (6.2.3) Content-Type: text/plain; charset=UTF-8; format=flowed; DelSp=Yes MIME-Version: 1.0 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Michael Ellerman a =C3=A9crit=C2=A0: > Christophe Leroy writes: >> A few changes to retrieve DAR and DSISR from struct regs >> instead of retrieving them directly, as they may have >> changed due to a TLB miss. >> >> Also modifies hash_page() and friends to work with virtual >> data addresses instead of physical ones. >> >> Signed-off-by: Christophe Leroy >> --- >> arch/powerpc/kernel/entry_32.S | 4 +++ >> arch/powerpc/kernel/head_32.S | 19 +++++++++++--- >> arch/powerpc/kernel/head_32.h | 4 ++- >> arch/powerpc/mm/book3s32/hash_low.S | 46=20=20 >>=20+++++++++++++++++++++------------- >> arch/powerpc/mm/book3s32/mmu.c | 9 +++++-- >> arch/powerpc/platforms/Kconfig.cputype | 2 ++ >> 6 files changed, 61 insertions(+), 23 deletions(-) > > If I build pmac32_defconfig with KVM enabled this causes a build break: > > arch/powerpc/kernel/head_32.S: Assembler messages: > arch/powerpc/kernel/head_32.S:324: Error: attempt to move .org backward= s > scripts/Makefile.build:357: recipe for target=20=20 >=20'arch/powerpc/kernel/head_32.o' failed > make[2]: *** [arch/powerpc/kernel/head_32.o] Error 1 > > In the interests of getting the series merged I'm inclined to just make > VMAP_STACK and KVM incompatible for now with: > > diff --git a/arch/powerpc/platforms/Kconfig.cputype=20=20 >=20b/arch/powerpc/platforms/Kconfig.cputype > index 15c9097dc4f7..5074fe77af40 100644 > --- a/arch/powerpc/platforms/Kconfig.cputype > +++ b/arch/powerpc/platforms/Kconfig.cputype > @@ -31,7 +31,7 @@ config PPC_BOOK3S_6xx > select PPC_HAVE_PMU_SUPPORT > select PPC_HAVE_KUEP > select PPC_HAVE_KUAP > - select HAVE_ARCH_VMAP_STACK > + select HAVE_ARCH_VMAP_STACK if !KVM_BOOK3S_32 > > config PPC_BOOK3S_601 > bool "PowerPC 601" > > > Thoughts? Ok, lets do it the way you propose. I'll look at this problem with KVM when I'm back next week. Thanks Christophe