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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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