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Shutemov" To: Baoquan He Cc: Ingo Molnar , Mike Galbraith , Andrew Morton , Peter Zijlstra , Greg Kroah-Hartman , Dave Young , kexec@lists.infradead.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Andy Lutomirski , linux-mm@kvack.org, Vivek Goyal , Cyrill Gorcunov , Thomas Gleixner , Borislav Petkov , Linus Torvalds , "Kirill A. Shutemov" Subject: Re: [PATCH 4.14 023/159] mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM_EXTREME=y Message-ID: <20180125155043.nj5b26yxutds7f37@node.shutemov.name> References: <20171222084623.668990192@linuxfoundation.org> <20171222084625.007160464@linuxfoundation.org> <1515302062.6507.18.camel@gmx.de> <20180108160444.2ol4fvgqbxnjmlpg@gmail.com> <20180108174653.7muglyihpngxp5tl@black.fi.intel.com> <20180109001303.dy73bpixsaegn4ol@node.shutemov.name> <20180117052454.GA2321@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180117052454.GA2321@localhost.localdomain> User-Agent: NeoMutt/20171215 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On Wed, Jan 17, 2018 at 01:24:54PM +0800, Baoquan He wrote: > Hi Kirill, > > I setup qemu 2.9.0 to test 5-level on kexec/kdump support. While both > kexec and kdump reset to BIOS immediately after triggering. I saw your > patch adding 5-level paging support for kexec. Wonder if your test > succeeded to jump into kexec/kdump kernel, and what else I need to > make it. By the way, I just tested the latest upstream kernel. > > commit 7f6890418 x86/kexec: Add 5-level paging support > > [ ~]$ qemu-system-x86_64 --version > QEMU emulator version 2.9.0(qemu-2.9.0-1.fc26.1) > Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers Sorry for delay. I didn't tested it in 5-level paging mode :-/ The patch below helps in my case. Could you test it? diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/relocate_kernel_64.S index 307d3bac5f04..65a98cf2307d 100644 --- a/arch/x86/kernel/relocate_kernel_64.S +++ b/arch/x86/kernel/relocate_kernel_64.S @@ -126,8 +126,12 @@ identity_mapped: /* * Set cr4 to a known state: * - physical address extension enabled + * - 5-level paging, if enabled */ movl $X86_CR4_PAE, %eax +#ifdef CONFIG_X86_5LEVEL + orl $X86_CR4_LA57, %eax +#endif movq %rax, %cr4 jmp 1f -- Kirill A. Shutemov