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Subject[PATCH 09/12] hw-breakpoints: cleanup HW Breakpoint registers before kexec
Date
From: K.Prasad <prasad@linux.vnet.ibm.com>

This patch disables Hardware breakpoints before doing a 'kexec' on the machine
so that the cpu doesn't keep debug registers values which would be out of
sync for the new image.

Original-patch-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com>
Reviewed-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
---
arch/x86/kernel/machine_kexec_32.c | 2 ++
arch/x86/kernel/machine_kexec_64.c | 2 ++
2 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/machine_kexec_32.c b/arch/x86/kernel/machine_kexec_32.c
index c1c429d..c843f84 100644
--- a/arch/x86/kernel/machine_kexec_32.c
+++ b/arch/x86/kernel/machine_kexec_32.c
@@ -25,6 +25,7 @@
#include <asm/desc.h>
#include <asm/system.h>
#include <asm/cacheflush.h>
+#include <asm/debugreg.h>

static void set_idt(void *newidt, __u16 limit)
{
@@ -202,6 +203,7 @@ void machine_kexec(struct kimage *image)

/* Interrupts aren't acceptable while we reboot */
local_irq_disable();
+ hw_breakpoint_disable();

if (image->preserve_context) {
#ifdef CONFIG_X86_IO_APIC
diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
index 84c3bf2..4a8bb82 100644
--- a/arch/x86/kernel/machine_kexec_64.c
+++ b/arch/x86/kernel/machine_kexec_64.c
@@ -18,6 +18,7 @@
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/mmu_context.h>
+#include <asm/debugreg.h>

static int init_one_level2_page(struct kimage *image, pgd_t *pgd,
unsigned long addr)
@@ -282,6 +283,7 @@ void machine_kexec(struct kimage *image)

/* Interrupts aren't acceptable while we reboot */
local_irq_disable();
+ hw_breakpoint_disable();

if (image->preserve_context) {
#ifdef CONFIG_X86_IO_APIC
--
1.6.2.3


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