From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759470AbYLQAOL (ORCPT ); Tue, 16 Dec 2008 19:14:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758437AbYLQAFx (ORCPT ); Tue, 16 Dec 2008 19:05:53 -0500 Received: from kroah.org ([198.145.64.141]:41202 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1757126AbYLQAFw (ORCPT ); Tue, 16 Dec 2008 19:05:52 -0500 Date: Tue, 16 Dec 2008 16:04:05 -0800 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: Justin Forbes , Zwane Mwaikambo , "Theodore Ts'o" , Randy Dunlap , Dave Jones , Chuck Wolber , Chris Wedgwood , Michael Krufky , Chuck Ebbert , Domenico Andreoli , Willy Tarreau , Rodrigo Rubira Branco , Jake Edge , Eugene Teo , torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Zachary Amsden Subject: [patch 04/22] x86 Fix VMI crash on boot in 2.6.28-rc8 Message-ID: <20081217000405.GE4504@kroah.com> References: <20081216235704.347182084@mini.kroah.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline; filename="x86-fix-vmi-crash-on-boot-in-2.6.28-rc8.patch" In-Reply-To: <20081217000306.GA4504@kroah.com> User-Agent: Mutt/1.5.16 (2007-06-09) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2.6.27-stable review patch. If anyone has any objections, please let us know. ------------------ From: Zachary Amsden commit ae8d04e2ecbb233926860e9ce145eac19c7835dc upstream. VMI initialiation can relocate the fixmap, causing early_ioremap to malfunction if it is initialized before the relocation. To fix this, VMI activation is split into two phases; the detection, which must happen before setting up ioremap, and the activation, which must happen after parsing early boot parameters. This fixes a crash on boot when VMI is enabled under VMware. Signed-off-by: Zachary Amsden Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- arch/x86/kernel/setup.c | 12 +++++------- arch/x86/kernel/smpboot.c | 2 -- arch/x86/kernel/vmi_32.c | 16 +++++++++++----- include/asm-x86/vmi.h | 8 +++++++- 4 files changed, 23 insertions(+), 15 deletions(-) --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -634,6 +634,9 @@ void __init setup_arch(char **cmdline_p) printk(KERN_INFO "Command line: %s\n", boot_command_line); #endif + /* VMI may relocate the fixmap; do this before touching ioremap area */ + vmi_init(); + early_cpu_init(); early_ioremap_init(); @@ -707,13 +710,8 @@ void __init setup_arch(char **cmdline_p) check_efer(); #endif -#if defined(CONFIG_VMI) && defined(CONFIG_X86_32) - /* - * Must be before kernel pagetables are setup - * or fixmap area is touched. - */ - vmi_init(); -#endif + /* Must be before kernel pagetables are setup */ + vmi_activate(); /* after early param, so could get panic from serial */ reserve_early_setup_data(); --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -289,9 +289,7 @@ static void __cpuinit start_secondary(vo * fragile that we want to limit the things done here to the * most necessary things. */ -#ifdef CONFIG_VMI vmi_bringup(); -#endif cpu_init(); preempt_disable(); smp_callin(); --- a/arch/x86/kernel/vmi_32.c +++ b/arch/x86/kernel/vmi_32.c @@ -960,8 +960,6 @@ static inline int __init activate_vmi(vo void __init vmi_init(void) { - unsigned long flags; - if (!vmi_rom) probe_vmi_rom(); else @@ -973,13 +971,21 @@ void __init vmi_init(void) reserve_top_address(-vmi_rom->virtual_top); - local_irq_save(flags); - activate_vmi(); - #ifdef CONFIG_X86_IO_APIC /* This is virtual hardware; timer routing is wired correctly */ no_timer_check = 1; #endif +} + +void vmi_activate(void) +{ + unsigned long flags; + + if (!vmi_rom) + return; + + local_irq_save(flags); + activate_vmi(); local_irq_restore(flags & X86_EFLAGS_IF); } --- a/include/asm-x86/vmi.h +++ b/include/asm-x86/vmi.h @@ -223,9 +223,15 @@ struct pci_header { } __attribute__((packed)); /* Function prototypes for bootstrapping */ +#ifdef CONFIG_VMI extern void vmi_init(void); +extern void vmi_activate(void); extern void vmi_bringup(void); -extern void vmi_apply_boot_page_allocations(void); +#else +static inline void vmi_init(void) {} +static inline void vmi_activate(void) {} +static inline void vmi_bringup(void) {} +#endif /* State needed to start an application processor in an SMP system. */ struct vmi_ap_state {