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Tue, 19 Nov 2019 06:57:14 +0000 (UTC) Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mail.ozlabs.org (Postfix) with ESMTPSA id 47HGpW0SZfz9sRY; Tue, 19 Nov 2019 17:57:07 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ellerman.id.au; s=201909; t=1574146627; bh=abFbgG1igsThhgb3dlNVPaVj97B/UnH0/Rzd5PqAH+0=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=oEzgknc7lx7h5mOjZB0zQ3OpkhQjE2o7K2yyBwiUDKIpC76o8tVULItublIoVzqSR IdXlpROlMM68c7Ufy69ZgmokqgE4PAe0yrWx53/OeYK+qKsHRJHp/UkbV1I2lYoMvI rb+qPgWWCxtRMW2fBV8yrPh+jL9kbZjyCD9Vvu76Ai9NolmcXQahEze5dtjpCfpj3b 4p3UjTem+R663qkGKc21teebtxS+C74oXnNYQ4stRAaIdu/bgqzIZ2AJbrJt3+eA1i FXSlzh2Chck58Mgg45i3Fe9GR9wP7WCPyGNi2K72I1H9ILsMSqLsVgpsgyvx8k1ksv yh0y5KM8NT1Qw== From: Michael Ellerman To: Christophe Leroy , Benjamin Herrenschmidt , Paul Mackerras , npiggin@gmail.com, dja@axtens.net Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org Subject: Re: [PATCH v3 15/15] powerpc/32s: Activate CONFIG_VMAP_STACK In-Reply-To: <87v9rhcuc5.fsf@mpe.ellerman.id.au> References: <87v9rhcuc5.fsf@mpe.ellerman.id.au> Date: Tue, 19 Nov 2019 17:57:03 +1100 Message-ID: <878soccq0w.fsf@mpe.ellerman.id.au> MIME-Version: 1.0 Content-Type: text/plain 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 writes: > 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 +++++++++++++++++++++------------- >> 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 backwards > scripts/Makefile.build:357: recipe for target '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 b/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 For some reason this needs to be !KVM. > config PPC_BOOK3S_601 > bool "PowerPC 601" > > > Thoughts? cheers