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x86: debugctlmsr context switch

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This adds low-level support for a per-thread value of MSR_IA32_DEBUGCTLMSR.
The per-thread value is switched in when TIF_DEBUGCTLMSR is set.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Roland McGrath
2008-01-30 13:30:54 +01:00
committed by Ingo Molnar
parent 0a049bb0ab
commit 7e9916040b
6 changed files with 19 additions and 4 deletions
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6
arch/x86/kernel/process_32.c
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@ -602,10 +602,14 @@ static noinline void
__switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p,
struct tss_struct *tss)
{
struct thread_struct *next;
struct thread_struct *prev, *next;
prev = &prev_p->thread;
next = &next_p->thread;
if (next->debugctlmsr != prev->debugctlmsr)
wrmsr(MSR_IA32_DEBUGCTLMSR, next->debugctlmsr, 0);
if (test_tsk_thread_flag(next_p, TIF_DEBUG)) {
set_debugreg(next->debugreg[0], 0);
set_debugreg(next->debugreg[1], 1);