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Commit 2c31b795 authored by Frederic Weisbecker's avatar Frederic Weisbecker Committed by Ingo Molnar
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x86/hw-breakpoints: Don't lose GE flag while disabling a breakpoint 



When we schedule out a breakpoint from the cpu, we also
incidentally remove the "Global exact breakpoint" flag from the
breakpoint control register. It makes us losing the fine grained
precision about the origin of the instructions that may trigger
breakpoint exceptions for the other breakpoints running in this
cpu.

Reported-by: default avatarPrasad <prasad@linux.vnet.ibm.com>
Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1259211878-6013-1-git-send-regression-fweisbec@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 605bfaee

arch/x86/kernel/hw_breakpoint.c

+14 −8
Original line number Diff line number Diff line
@@ -59,21 +59,27 @@ static DEFINE_PER_CPU(unsigned long, cpu_debugreg[HBP_NUM]); 
static DEFINE_PER_CPU(struct perf_event *, bp_per_reg[HBP_NUM]);





/*

 * Encode the length, type, Exact, and Enable bits for a particular breakpoint

 * as stored in debug register 7.

 */

unsigned long encode_dr7(int drnum, unsigned int len, unsigned int type)

static inline unsigned long

__encode_dr7(int drnum, unsigned int len, unsigned int type)

{

	unsigned long bp_info;



	bp_info = (len | type) & 0xf;

	bp_info <<= (DR_CONTROL_SHIFT + drnum * DR_CONTROL_SIZE);

	bp_info |= (DR_GLOBAL_ENABLE << (drnum * DR_ENABLE_SIZE)) |

				DR_GLOBAL_SLOWDOWN;

	bp_info |= (DR_GLOBAL_ENABLE << (drnum * DR_ENABLE_SIZE));



	return bp_info;

}



/*

 * Encode the length, type, Exact, and Enable bits for a particular breakpoint

 * as stored in debug register 7.

 */

unsigned long encode_dr7(int drnum, unsigned int len, unsigned int type)

{

	return __encode_dr7(drnum, len, type) | DR_GLOBAL_SLOWDOWN;

}



/*

 * Decode the length and type bits for a particular breakpoint as

 * stored in debug register 7.  Return the "enabled" status.
@@ -154,7 +160,7 @@ void arch_uninstall_hw_breakpoint(struct perf_event *bp) 
		return;



	dr7 = &__get_cpu_var(cpu_dr7);

	*dr7 &= ~encode_dr7(i, info->len, info->type);

	*dr7 &= ~__encode_dr7(i, info->len, info->type);



	set_debugreg(*dr7, 7);

}