mirror of
https://github.com/torvalds/linux.git
synced 2024-12-25 04:11:49 +00:00
c3c2fee384
Some amount of asm-x86/mmu_context.h can be unified, including activate_mm paravirt hook. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: xen-devel <xen-devel@lists.xensource.com> Cc: Stephen Tweedie <sct@redhat.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Cc: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
#ifndef __X86_64_MMU_CONTEXT_H
|
|
#define __X86_64_MMU_CONTEXT_H
|
|
|
|
#include <asm/pda.h>
|
|
|
|
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
if (read_pda(mmu_state) == TLBSTATE_OK)
|
|
write_pda(mmu_state, TLBSTATE_LAZY);
|
|
#endif
|
|
}
|
|
|
|
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
|
|
struct task_struct *tsk)
|
|
{
|
|
unsigned cpu = smp_processor_id();
|
|
if (likely(prev != next)) {
|
|
/* stop flush ipis for the previous mm */
|
|
cpu_clear(cpu, prev->cpu_vm_mask);
|
|
#ifdef CONFIG_SMP
|
|
write_pda(mmu_state, TLBSTATE_OK);
|
|
write_pda(active_mm, next);
|
|
#endif
|
|
cpu_set(cpu, next->cpu_vm_mask);
|
|
load_cr3(next->pgd);
|
|
|
|
if (unlikely(next->context.ldt != prev->context.ldt))
|
|
load_LDT_nolock(&next->context);
|
|
}
|
|
#ifdef CONFIG_SMP
|
|
else {
|
|
write_pda(mmu_state, TLBSTATE_OK);
|
|
if (read_pda(active_mm) != next)
|
|
BUG();
|
|
if (!cpu_test_and_set(cpu, next->cpu_vm_mask)) {
|
|
/* We were in lazy tlb mode and leave_mm disabled
|
|
* tlb flush IPI delivery. We must reload CR3
|
|
* to make sure to use no freed page tables.
|
|
*/
|
|
load_cr3(next->pgd);
|
|
load_LDT_nolock(&next->context);
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#define deactivate_mm(tsk, mm) \
|
|
do { \
|
|
load_gs_index(0); \
|
|
asm volatile("movl %0,%%fs"::"r"(0)); \
|
|
} while (0)
|
|
|
|
#endif
|