From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753186AbbC3Iyn (ORCPT ); Mon, 30 Mar 2015 04:54:43 -0400 Received: from mail-pa0-f51.google.com ([209.85.220.51]:33262 "EHLO mail-pa0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752988AbbC3Iyl (ORCPT ); Mon, 30 Mar 2015 04:54:41 -0400 Message-ID: <55190F45.1070803@linaro.org> Date: Mon, 30 Mar 2015 17:54:29 +0900 From: AKASHI Takahiro User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 MIME-Version: 1.0 To: Marc Zyngier CC: Kyle McMartin , Catalin Marinas , Will Deacon , Mark Rutland , "linux-arm-kernel@lists.infradead.org" , "linaro-kernel@lists.linaro.org" , "geoff@infradead.org" , "kexec@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "broonie@kernel.org" , "david.griego@linaro.org" , "christoffer.dall@linaro.org" , "freddy77@gmail.com" Subject: Re: [RFC v2 0/5] arm64: kvm: reset hyp context for kexec References: <1427358326-3708-1-git-send-email-takahiro.akashi@linaro.org> <20150327153131.GK12400@redacted.bos.redhat.com> <55157920.3050003@arm.com> <20150327174044.GL12400@redacted.bos.redhat.com> <5518A969.3090707@linaro.org> <20150330081613.60ff7dc0@arm.com> In-Reply-To: <20150330081613.60ff7dc0@arm.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/30/2015 04:16 PM, Marc Zyngier wrote: > On Mon, 30 Mar 2015 02:39:53 +0100 > AKASHI Takahiro wrote: > >> On 03/28/2015 02:40 AM, Kyle McMartin wrote: >>> On Fri, Mar 27, 2015 at 03:37:04PM +0000, Marc Zyngier wrote: >>>>> [ 236.260863] Kernel panic - not syncing: HYP panic: >>>>> [ 236.260863] PS:600003c9 PC:000003ffffff0830 ESR:0000000096000006 >>>> >>>> It would be interesting if you could find out what you have at offset >>>> 0x830 of hyp-init.o (the stack trace is for EL1, and is not going to >>>> help much). >>>> >>> >>> Given the alignment, i'm going to assume i'm looking at the right thing: >>> >>> 0000000000000820 <__kvm_hyp_reset>: >>> 820: d51c2000 msr ttbr0_el2, x0 >>> 824: d5033fdf isb >>> 828: d50c871f tlbi alle2 >>> 82c: d5033f9f dsb sy >>> 830: 10000060 adr x0, 83c <__kvm_hyp_reset+0x1c> >>> 834: b3403c01 bfxil x1, x0, #0, #16 >>> 838: d61f0020 br x1 >>> 83c: d53c1000 mrs x0, sctlr_el2 >>> >>> but it seems fairly implausible to be trapping on ADR x0, 1f... >> >> >> I've never seen this panic on fast model... >> >> ESR shows that >> - Exception class: Data abort taken without a change in Exception level >> - Data fault status code: Translation fault at EL2 >> >> and FAR seems not to be a proper address. > > ... which is consistent with what we're seeing here (data fault on > something that doesn't generate a load/store). I'm pretty sure the > page tables are screwed. > > Have you tested it with 64k pages? Hmm... It seems that I was able to reproduce the problem if 64k pages enabled. -Takahiro AKASHI > Thanks, > > M. >