mirror of
https://github.com/torvalds/linux.git
synced 2024-11-14 08:02:07 +00:00
d6dd61c831
Add hooks to allow a paravirt implementation to track the lifetime of an mm. Paravirtualization requires three hooks, but only two are needed in common code. They are: arch_dup_mmap, which is called when a new mmap is created at fork arch_exit_mmap, which is called when the last process reference to an mm is dropped, which typically happens on exit and exec. The third hook is activate_mm, which is called from the arch-specific activate_mm() macro/function, and so doesn't need stub versions for other architectures. It's called when an mm is first used. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: linux-arch@vger.kernel.org Cc: James Bottomley <James.Bottomley@SteelEye.com> Acked-by: Ingo Molnar <mingo@elte.hu>
73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
/*
|
|
* include/asm-s390/mmu_context.h
|
|
*
|
|
* S390 version
|
|
*
|
|
* Derived from "include/asm-i386/mmu_context.h"
|
|
*/
|
|
|
|
#ifndef __S390_MMU_CONTEXT_H
|
|
#define __S390_MMU_CONTEXT_H
|
|
|
|
#include <asm/pgalloc.h>
|
|
#include <asm-generic/mm_hooks.h>
|
|
|
|
/*
|
|
* get a new mmu context.. S390 don't know about contexts.
|
|
*/
|
|
#define init_new_context(tsk,mm) 0
|
|
|
|
#define destroy_context(mm) do { } while (0)
|
|
|
|
#ifndef __s390x__
|
|
#define LCTL_OPCODE "lctl"
|
|
#define PGTABLE_BITS (_SEGMENT_TABLE|USER_STD_MASK)
|
|
#else
|
|
#define LCTL_OPCODE "lctlg"
|
|
#define PGTABLE_BITS (_REGION_TABLE|USER_STD_MASK)
|
|
#endif
|
|
|
|
static inline void enter_lazy_tlb(struct mm_struct *mm,
|
|
struct task_struct *tsk)
|
|
{
|
|
}
|
|
|
|
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
|
|
struct task_struct *tsk)
|
|
{
|
|
pgd_t *shadow_pgd = get_shadow_pgd(next->pgd);
|
|
|
|
if (prev != next) {
|
|
S390_lowcore.user_asce = (__pa(next->pgd) & PAGE_MASK) |
|
|
PGTABLE_BITS;
|
|
if (shadow_pgd) {
|
|
/* Load primary/secondary space page table origin. */
|
|
S390_lowcore.user_exec_asce =
|
|
(__pa(shadow_pgd) & PAGE_MASK) | PGTABLE_BITS;
|
|
asm volatile(LCTL_OPCODE" 1,1,%0\n"
|
|
LCTL_OPCODE" 7,7,%1"
|
|
: : "m" (S390_lowcore.user_exec_asce),
|
|
"m" (S390_lowcore.user_asce) );
|
|
} else if (switch_amode) {
|
|
/* Load primary space page table origin. */
|
|
asm volatile(LCTL_OPCODE" 1,1,%0"
|
|
: : "m" (S390_lowcore.user_asce) );
|
|
} else
|
|
/* Load home space page table origin. */
|
|
asm volatile(LCTL_OPCODE" 13,13,%0"
|
|
: : "m" (S390_lowcore.user_asce) );
|
|
}
|
|
cpu_set(smp_processor_id(), next->cpu_vm_mask);
|
|
}
|
|
|
|
#define deactivate_mm(tsk,mm) do { } while (0)
|
|
|
|
static inline void activate_mm(struct mm_struct *prev,
|
|
struct mm_struct *next)
|
|
{
|
|
switch_mm(prev, next, current);
|
|
set_fs(current->thread.mm_segment);
|
|
}
|
|
|
|
#endif /* __S390_MMU_CONTEXT_H */
|