Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965057Ab2JXPVi (ORCPT ); Wed, 24 Oct 2012 11:21:38 -0400 Received: from mail-ia0-f174.google.com ([209.85.210.174]:59786 "EHLO mail-ia0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933839Ab2JXPVh (ORCPT ); Wed, 24 Oct 2012 11:21:37 -0400 MIME-Version: 1.0 X-Originating-IP: [2001:470:1f05:1640:8180:e7c3:6ba0:d42] In-Reply-To: <5087A999.8090802@canonical.com> References: <1349706500.15966.165.camel@mfleming-mobl1.ger.corp.intel.com> <1351059878-28795-1-git-send-email-olof@lixom.net> <5087A999.8090802@canonical.com> Date: Wed, 24 Oct 2012 08:21:36 -0700 Message-ID: Subject: Re: [PATCH v2] x86: efi: Turn off efi_enabled after setup on mixed fw/kernel From: Olof Johansson To: Maarten Lankhorst Cc: matt@console-pimps.org, hpa@zytor.com, linux-kernel@vger.kernel.org, marko.kohtala@gmail.com, Matthew Garrett Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2876 Lines: 77 Hi, On Wed, Oct 24, 2012 at 1:40 AM, Maarten Lankhorst wrote: > Op 24-10-12 08:24, Olof Johansson schreef: >> When 32-bit EFI is used with 64-bit kernel (or vice versa), turn off >> efi_enabled once setup is done. Beyond setup, it is normally used to >> determine if runtime services are available and we will have none. >> >> This will resolve issues stemming from efivars modprobe panicking on a >> 32/64-bit setup, as well as some reboot issues on similar setups. >> >> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=45991 >> >> Reported-by: Marko Kohtala >> Reported-by: Maxim Kammerer >> Signed-off-by: Olof Johansson >> Cc: stable@kernel.org # 3.4 - 3.6 >> Cc: Matthew Garrett >> Cc: Maarten Lankhorst >> --- >> >> v2: rebase due to context diffs, and simplified efi_is_native() logic. >> >> arch/x86/kernel/setup.c | 11 +++++++++++ >> arch/x86/platform/efi/efi.c | 16 +++++++++------- >> 2 files changed, 20 insertions(+), 7 deletions(-) >> >> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c >> index 468e98d..ea2c587 100644 >> --- a/arch/x86/kernel/setup.c >> +++ b/arch/x86/kernel/setup.c >> @@ -1048,6 +1048,17 @@ void __init setup_arch(char **cmdline_p) >> arch_init_ideal_nops(); >> >> register_refined_jiffies(CLOCK_TICK_RATE); >> + >> +#ifdef CONFIG_EFI >> + /* Once setup is done above, disable efi_enabled on mismatched >> + * firmware/kernel archtectures since there is no support for >> + * runtime services. >> + */ >> + if (IS_ENABLED(CONFIG_X86_64) != efi_64bit) { >> + pr_info("efi: Setup done, disabling due to 32/64-bit mismatch\n"); >> + efi_enabled = 0; >> + } >> +#endif >> } > > Won't this give a spurious warning if it's already disabled? Ah, of course, my bad. v3 forthcoming. > And it should probably be moved to before the vga con setup, else it seems you > might not get a vga console when efifb is not used. Unless that's intentional, > but in that case please change the commit message to reflect that. :-) Hmm. I think the current logic and flow is valid -- it's likely a bad idea to enable VGA console if the memory isn't set aside in the memory map, since that possibly means that EFI didn't POST graphics for VGA text mode in the first place. > With those issues fixed in next version. > > Acked-by: Maarten Lankhorst Please confirm if you agree with my reasoning above, I'll post v3 right after if so. Thanks, -Olof -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/