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Tue, 19 Nov 2019 06:58:19 +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 47HGqq4dKcz9sSP; Tue, 19 Nov 2019 17:58:15 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ellerman.id.au; s=201909; t=1574146696; bh=UJDJAAoM1z5MF3IYbIZX69JmcS9dmQDJlWRDIRsZqlY=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=rqUBxFVHDz30tTohZ/5o4s0MG6uRLUgC+jddFLvTHOI23O6RYj6iAlN8BM6F/gpYo IOywwfiOTa3ViPBXLipcof5niocJACuF68pJyLl8QpMJwrdlcDTcAqModRec5sYIRl 507+UJ5jZMm2vfIitezy+PzkfrX9WbsX7sAXilKzyR5Uz9pvbM64sIWCDifSo7PofG ugWVXffzUZp+5/GsmKgNDV6c0+ADGddw64qIMeDyZWb9gyTiUhSgwcI2hIuyPi9Ftm F6pvPmWc/7DVqqn2r7/1BSOxpSJHXP3ZncO3HX0BBu9ei54wFIrBMDrmiThfuJUj0i Bnhm25x1zJnuQ== 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: References: Date: Tue, 19 Nov 2019 17:58:14 +1100 Message-ID: <875zjgcpyx.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: 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(-) This is faulting with qemu mac99 model: Key type id_resolver registered Key type id_legacy registered BUG: Unable to handle kernel data access on read at 0x2f0db684 Faulting instruction address: 0x00004130 Oops: Kernel access of bad area, sig: 11 [#1] BE PAGE_SIZE=4K MMU=Hash PowerMac Modules linked in: CPU: 0 PID: 65 Comm: modprobe Not tainted 5.4.0-rc2-gcc49+ #63 NIP: 00004130 LR: 000008c8 CTR: b7eb86e0 REGS: f106de80 TRAP: 0300 Not tainted (5.4.0-rc2-gcc49+) MSR: 00003012 CR: 4106df38 XER: 20000000 DAR: 2f0db684 DSISR: 40000000 GPR00: b7ec5d64 f106df38 00000000 bf988a70 00000000 2f0db540 b7ec3620 bf988d38 GPR08: 10000880 0000d032 72656773 f106df38 b7ed10ec 00000000 b7ed3d38 b7ee8900 GPR16: bf988d10 00000001 00000000 bf988d10 b7ec3620 bf988d50 b7ee76ec b7ee7320 GPR24: 10000878 00000000 b7ee8900 00000000 10029f00 10000879 b7ee7ff4 bf988d30 NIP [00004130] 0x4130 LR [000008c8] 0x8c8 Call Trace: [f106df38] [c0016224] ret_from_syscall+0x0/0x34 (unreliable) --- interrupt: c01 at 0xb7ed0f50 LR = 0xb7ec5d64 Instruction dump: db8300e0 XXXXXXXX XXXXXXXX XXXXXXXX fc00048e XXXXXXXX XXXXXXXX XXXXXXXX 60a52000 XXXXXXXX XXXXXXXX XXXXXXXX 80850144 XXXXXXXX XXXXXXXX XXXXXXXX ---[ end trace 265da51c6d8b86c5 ]--- I think I'll have to drop this series for now. cheers