[patch 04/22] x86 Fix VMI crash on boot in 2.6.28-rc8

Greg KH
2008-12-17T00:14:11Z

[-- Attachment #1: x86-fix-vmi-crash-on-boot-in-2.6.28-rc8.patch --]
[-- Type: text/plain, Size: 3271 bytes --]

2.6.27-stable review patch. If anyone has any objections, please let us know.

------------------

From: Zachary Amsden <zach@vmware.com>

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 <zach@vmware.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
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 {