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[108.223.40.66]) by smtp.gmail.com with ESMTPSA id w16-v6sm20595345pfi.101.2018.08.25.06.52.33 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 25 Aug 2018 06:52:34 -0700 (PDT) Subject: Re: [PATCH 4.4 103/105] Revert "x86/mm/pat: Ensure cpa->pfn only contains page frame numbers" To: Roland Dreier , Greg Kroah-Hartman Cc: Ben Hutchings , LKML , stable@vger.kernel.org, matt@codeblueprint.co.uk, bp@suse.de, Andrew Morton , Andy Lutomirski , luto@kernel.org, Ard Biesheuvel , bp@alien8.de, brgerst@gmail.com, davej@codemonkey.org.uk, dvlasenk@redhat.com, "H. Peter Anvin" , Linus Torvalds , Peter Zijlstra , sai.praneeth.prakhya@intel.com, sds@tycho.nsa.gov, Thomas Gleixner , toshi.kani@hp.com, linux-efi@vger.kernel.org, Ingo Molnar , Yazen.Ghannam@amd.com References: <20171215092305.994559179@linuxfoundation.org> <20171215092311.347628971@linuxfoundation.org> <1535129126.2902.36.camel@codethink.co.uk> <20180824191749.GA15489@kroah.com> From: Guenter Roeck Message-ID: <35e0f79b-6fac-5027-6377-67dbe2a293b9@roeck-us.net> Date: Sat, 25 Aug 2018 06:52:32 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Roland, On 08/24/2018 01:04 PM, Roland Dreier wrote: >> Ok, so what patch should be reverted? I'm seeing other reports of >> problems all around this same area, but I can't figure out exactly what >> to do. > > Are any of those reports public? If so can you point me at them, I'm > curious if the symptoms match up. > > I don't think we want to revert anything. I think you should pull in > edc3b9129cec and at least the first three patches that Ben listed: > > 21cdb6b56843 x86/mm: Page align the '_end' symbol to avoid pfn conversion bugs > b61a76f8850d x86/efi: Map RAM into the identity page table for mixed mode > 753b11ef8e92 x86/efi: Setup separate EFI page tables in kexec paths > > the first patch takes a bit of massaging (mostly because some of it is > already touched by 02ff2769edbc, which keeps the changes from > edc3b9129cec, and so we can drop a good bit when applying). The other > three apply cleanly. > > I'm currently testing that and can send you the state of my tree in a bit. > Have you made any progress ? On my side I am still out of luck since I can not reproduce the problem. Thanks, Guenter