mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Andy Lutomirski](/assets/img/avatar_default.png)
This adds two new variables to mmu_context_t: ctx_id and tlb_gen. ctx_id uniquely identifies the mm_struct and will never be reused. For a given mm_struct (and hence ctx_id), tlb_gen is a monotonic count of the number of times that a TLB flush has been requested. The pair (ctx_id, tlb_gen) can be used as an identifier for TLB flush actions and will be used in subsequent patches to reliably determine whether all needed TLB flushes have occurred on a given CPU. This patch is split out for ease of review. By itself, it has no real effect other than creating and updating the new variables. Signed-off-by: Andy Lutomirski <luto@kernel.org> Reviewed-by: Nadav Amit <nadav.amit@gmail.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/413a91c24dab3ed0caa5f4e4d017d87b0857f920.1498751203.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
#ifndef _ASM_X86_MMU_H
|
|
#define _ASM_X86_MMU_H
|
|
|
|
#include <linux/spinlock.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/atomic.h>
|
|
|
|
/*
|
|
* x86 has arch-specific MMU state beyond what lives in mm_struct.
|
|
*/
|
|
typedef struct {
|
|
/*
|
|
* ctx_id uniquely identifies this mm_struct. A ctx_id will never
|
|
* be reused, and zero is not a valid ctx_id.
|
|
*/
|
|
u64 ctx_id;
|
|
|
|
/*
|
|
* Any code that needs to do any sort of TLB flushing for this
|
|
* mm will first make its changes to the page tables, then
|
|
* increment tlb_gen, then flush. This lets the low-level
|
|
* flushing code keep track of what needs flushing.
|
|
*
|
|
* This is not used on Xen PV.
|
|
*/
|
|
atomic64_t tlb_gen;
|
|
|
|
#ifdef CONFIG_MODIFY_LDT_SYSCALL
|
|
struct ldt_struct *ldt;
|
|
#endif
|
|
|
|
#ifdef CONFIG_X86_64
|
|
/* True if mm supports a task running in 32 bit compatibility mode. */
|
|
unsigned short ia32_compat;
|
|
#endif
|
|
|
|
struct mutex lock;
|
|
void __user *vdso; /* vdso base address */
|
|
const struct vdso_image *vdso_image; /* vdso image in use */
|
|
|
|
atomic_t perf_rdpmc_allowed; /* nonzero if rdpmc is allowed */
|
|
#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
|
|
/*
|
|
* One bit per protection key says whether userspace can
|
|
* use it or not. protected by mmap_sem.
|
|
*/
|
|
u16 pkey_allocation_map;
|
|
s16 execute_only_pkey;
|
|
#endif
|
|
#ifdef CONFIG_X86_INTEL_MPX
|
|
/* address of the bounds directory */
|
|
void __user *bd_addr;
|
|
#endif
|
|
} mm_context_t;
|
|
|
|
#define INIT_MM_CONTEXT(mm) \
|
|
.context = { \
|
|
.ctx_id = 1, \
|
|
}
|
|
|
|
void leave_mm(int cpu);
|
|
|
|
#endif /* _ASM_X86_MMU_H */
|