From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx1.redhat.com ([209.132.183.28]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gjLVQ-0000ae-Un for kexec@lists.infradead.org; Tue, 15 Jan 2019 09:59:38 +0000 From: Kairui Song Subject: [PATCH v2 1/2] x86, kexec_file_load: Don't setup EFI info if EFI runtime is not enabled Date: Tue, 15 Jan 2019 17:58:33 +0800 Message-Id: <20190115095834.22617-2-kasong@redhat.com> In-Reply-To: <20190115095834.22617-1-kasong@redhat.com> References: <20190115095834.22617-1-kasong@redhat.com> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: linux-kernel@vger.kernel.org Cc: rafael.j.wysocki@intel.com, Kairui Song , bhe@redhat.com, erik.schmauss@intel.com, x86@kernel.org, kexec@lists.infradead.org, robert.moore@intel.com, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, tglx@linutronix.de, dyoung@redhat.com, akpm@linux-foundation.org, lenb@kernel.org Currently with "efi=noruntime" in kernel command line, calling kexec_file_load will raise below problem: [ 97.967067] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 97.967894] #PF error: [normal kernel read fault] ... [ 97.980456] Call Trace: [ 97.980724] efi_runtime_map_copy+0x28/0x30 [ 97.981267] bzImage64_load+0x688/0x872 [ 97.981794] arch_kexec_kernel_image_load+0x6d/0x70 [ 97.982441] kimage_file_alloc_init+0x13e/0x220 [ 97.983035] __x64_sys_kexec_file_load+0x144/0x290 [ 97.983586] do_syscall_64+0x55/0x1a0 [ 97.983962] entry_SYSCALL_64_after_hwframe+0x44/0xa9 When efi runtime is not enabled, efi memmap is not mapped, so just skip EFI info setup. Suggested-by: Dave Young Signed-off-by: Kairui Song --- arch/x86/kernel/kexec-bzimage64.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c index 0d5efa34f359..53917a3ebf94 100644 --- a/arch/x86/kernel/kexec-bzimage64.c +++ b/arch/x86/kernel/kexec-bzimage64.c @@ -167,6 +167,9 @@ setup_efi_state(struct boot_params *params, unsigned long params_load_addr, struct efi_info *current_ei = &boot_params.efi_info; struct efi_info *ei = ¶ms->efi_info; + if (!efi_enabled(EFI_RUNTIME_SERVICES)) + return 0; + if (!current_ei->efi_memmap_size) return 0; -- 2.20.1 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec