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[RFC,v2,20/26] mm/asi: Add option to map cpu_hw_events

Message ID 1562855138-19507-21-git-send-email-alexandre.chartre@oracle.com (mailing list archive)
State New, archived
Headers show
Series Kernel Address Space Isolation | expand

Commit Message

Alexandre Chartre July 11, 2019, 2:25 p.m. UTC 
Add option to map cpu_hw_events in ASI pagetable. Also restructure
to select ptions for percpu optional mapping.

Signed-off-by: Alexandre Chartre <alexandre.chartre@oracle.com>
---
 arch/x86/include/asm/asi.h |    1 +
 arch/x86/mm/asi.c          |    3 +++
 2 files changed, 4 insertions(+), 0 deletions(-)
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Patch

diff --git a/arch/x86/include/asm/asi.h b/arch/x86/include/asm/asi.h
index 8199618..f489551 100644
--- a/arch/x86/include/asm/asi.h
+++ b/arch/x86/include/asm/asi.h
@@ -19,6 +19,7 @@ 
 #define ASI_MAP_CPU_PTR		0x02	/* for get_cpu_var()/this_cpu_ptr() */
 #define ASI_MAP_CURRENT_TASK	0x04	/* map the current task */
 #define ASI_MAP_RCU_DATA	0x08	/* map rcu data */
+#define ASI_MAP_CPU_HW_EVENTS	0x10	/* map cpu hw events */
 
 enum page_table_level {
 	PGT_LEVEL_PTE,
diff --git a/arch/x86/mm/asi.c b/arch/x86/mm/asi.c
index 20c23dc..d488704 100644
--- a/arch/x86/mm/asi.c
+++ b/arch/x86/mm/asi.c
@@ -8,6 +8,7 @@ 
 #include <linux/export.h>
 #include <linux/gfp.h>
 #include <linux/irq_work.h>
+#include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/printk.h>
 #include <linux/sched/debug.h>
@@ -17,6 +18,7 @@ 
 #include <asm/bug.h>
 #include <asm/mmu_context.h>
 
+#include "../events/perf_event.h"
 #include "../../../kernel/rcu/tree.h"
 
 /* ASI sessions, one per cpu */
@@ -33,6 +35,7 @@  struct asi_map_option asi_map_percpu_options[] = {
 	{ ASI_MAP_CPU_PTR, &this_cpu_off, sizeof(this_cpu_off) },
 	{ ASI_MAP_CURRENT_TASK, &current_task, sizeof(current_task) },
 	{ ASI_MAP_RCU_DATA, &rcu_data, sizeof(rcu_data) },
+	{ ASI_MAP_CPU_HW_EVENTS, &cpu_hw_events, sizeof(cpu_hw_events) },
 };
 
 static void asi_log_fault(struct asi *asi, struct pt_regs *regs,