583 lines
14 KiB
C
583 lines
14 KiB
C
/*
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* Copyright IBM Corp. 2007, 2011
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/gfp.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/smp.h>
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#include <linux/spinlock.h>
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#include <linux/rcupdate.h>
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#include <linux/slab.h>
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#include <linux/swapops.h>
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#include <linux/sysctl.h>
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#include <linux/ksm.h>
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#include <linux/mman.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/tlb.h>
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#include <asm/tlbflush.h>
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#include <asm/mmu_context.h>
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static inline pte_t ptep_flush_direct(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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int active, count;
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pte_t old;
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old = *ptep;
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if (unlikely(pte_val(old) & _PAGE_INVALID))
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return old;
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active = (mm == current->active_mm) ? 1 : 0;
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count = atomic_add_return(0x10000, &mm->context.attach_count);
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if (MACHINE_HAS_TLB_LC && (count & 0xffff) <= active &&
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cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id())))
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__ptep_ipte_local(addr, ptep);
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else
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__ptep_ipte(addr, ptep);
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atomic_sub(0x10000, &mm->context.attach_count);
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return old;
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}
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static inline pte_t ptep_flush_lazy(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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int active, count;
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pte_t old;
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old = *ptep;
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if (unlikely(pte_val(old) & _PAGE_INVALID))
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return old;
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active = (mm == current->active_mm) ? 1 : 0;
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count = atomic_add_return(0x10000, &mm->context.attach_count);
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if ((count & 0xffff) <= active) {
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pte_val(*ptep) |= _PAGE_INVALID;
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mm->context.flush_mm = 1;
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} else
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__ptep_ipte(addr, ptep);
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atomic_sub(0x10000, &mm->context.attach_count);
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return old;
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}
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static inline pgste_t pgste_get_lock(pte_t *ptep)
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{
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unsigned long new = 0;
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#ifdef CONFIG_PGSTE
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unsigned long old;
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preempt_disable();
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asm(
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" lg %0,%2\n"
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"0: lgr %1,%0\n"
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" nihh %0,0xff7f\n" /* clear PCL bit in old */
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" oihh %1,0x0080\n" /* set PCL bit in new */
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" csg %0,%1,%2\n"
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" jl 0b\n"
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: "=&d" (old), "=&d" (new), "=Q" (ptep[PTRS_PER_PTE])
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: "Q" (ptep[PTRS_PER_PTE]) : "cc", "memory");
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#endif
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return __pgste(new);
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}
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static inline void pgste_set_unlock(pte_t *ptep, pgste_t pgste)
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{
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#ifdef CONFIG_PGSTE
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asm(
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" nihh %1,0xff7f\n" /* clear PCL bit */
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" stg %1,%0\n"
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: "=Q" (ptep[PTRS_PER_PTE])
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: "d" (pgste_val(pgste)), "Q" (ptep[PTRS_PER_PTE])
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: "cc", "memory");
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preempt_enable();
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#endif
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}
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static inline pgste_t pgste_get(pte_t *ptep)
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{
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unsigned long pgste = 0;
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#ifdef CONFIG_PGSTE
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pgste = *(unsigned long *)(ptep + PTRS_PER_PTE);
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#endif
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return __pgste(pgste);
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}
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static inline void pgste_set(pte_t *ptep, pgste_t pgste)
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{
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#ifdef CONFIG_PGSTE
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*(pgste_t *)(ptep + PTRS_PER_PTE) = pgste;
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#endif
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}
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static inline pgste_t pgste_update_all(pte_t pte, pgste_t pgste,
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struct mm_struct *mm)
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{
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#ifdef CONFIG_PGSTE
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unsigned long address, bits, skey;
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if (!mm_use_skey(mm) || pte_val(pte) & _PAGE_INVALID)
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return pgste;
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address = pte_val(pte) & PAGE_MASK;
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skey = (unsigned long) page_get_storage_key(address);
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bits = skey & (_PAGE_CHANGED | _PAGE_REFERENCED);
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/* Transfer page changed & referenced bit to guest bits in pgste */
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pgste_val(pgste) |= bits << 48; /* GR bit & GC bit */
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/* Copy page access key and fetch protection bit to pgste */
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pgste_val(pgste) &= ~(PGSTE_ACC_BITS | PGSTE_FP_BIT);
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pgste_val(pgste) |= (skey & (_PAGE_ACC_BITS | _PAGE_FP_BIT)) << 56;
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#endif
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return pgste;
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}
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static inline void pgste_set_key(pte_t *ptep, pgste_t pgste, pte_t entry,
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struct mm_struct *mm)
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{
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#ifdef CONFIG_PGSTE
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unsigned long address;
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unsigned long nkey;
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if (!mm_use_skey(mm) || pte_val(entry) & _PAGE_INVALID)
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return;
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VM_BUG_ON(!(pte_val(*ptep) & _PAGE_INVALID));
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address = pte_val(entry) & PAGE_MASK;
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/*
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* Set page access key and fetch protection bit from pgste.
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* The guest C/R information is still in the PGSTE, set real
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* key C/R to 0.
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*/
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nkey = (pgste_val(pgste) & (PGSTE_ACC_BITS | PGSTE_FP_BIT)) >> 56;
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nkey |= (pgste_val(pgste) & (PGSTE_GR_BIT | PGSTE_GC_BIT)) >> 48;
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page_set_storage_key(address, nkey, 0);
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#endif
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}
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static inline pgste_t pgste_set_pte(pte_t *ptep, pgste_t pgste, pte_t entry)
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{
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#ifdef CONFIG_PGSTE
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if ((pte_val(entry) & _PAGE_PRESENT) &&
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(pte_val(entry) & _PAGE_WRITE) &&
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!(pte_val(entry) & _PAGE_INVALID)) {
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if (!MACHINE_HAS_ESOP) {
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/*
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* Without enhanced suppression-on-protection force
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* the dirty bit on for all writable ptes.
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*/
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pte_val(entry) |= _PAGE_DIRTY;
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pte_val(entry) &= ~_PAGE_PROTECT;
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}
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if (!(pte_val(entry) & _PAGE_PROTECT))
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/* This pte allows write access, set user-dirty */
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pgste_val(pgste) |= PGSTE_UC_BIT;
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}
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#endif
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*ptep = entry;
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return pgste;
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}
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static inline pgste_t pgste_ipte_notify(struct mm_struct *mm,
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unsigned long addr,
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pte_t *ptep, pgste_t pgste)
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{
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#ifdef CONFIG_PGSTE
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if (pgste_val(pgste) & PGSTE_IN_BIT) {
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pgste_val(pgste) &= ~PGSTE_IN_BIT;
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ptep_notify(mm, addr, ptep);
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}
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#endif
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return pgste;
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}
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static inline pgste_t ptep_xchg_start(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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pgste_t pgste = __pgste(0);
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if (mm_has_pgste(mm)) {
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pgste = pgste_get_lock(ptep);
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pgste = pgste_ipte_notify(mm, addr, ptep, pgste);
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}
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return pgste;
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}
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static inline void ptep_xchg_commit(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep,
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pgste_t pgste, pte_t old, pte_t new)
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{
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if (mm_has_pgste(mm)) {
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if (pte_val(old) & _PAGE_INVALID)
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pgste_set_key(ptep, pgste, new, mm);
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if (pte_val(new) & _PAGE_INVALID) {
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pgste = pgste_update_all(old, pgste, mm);
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if ((pgste_val(pgste) & _PGSTE_GPS_USAGE_MASK) ==
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_PGSTE_GPS_USAGE_UNUSED)
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pte_val(old) |= _PAGE_UNUSED;
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}
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pgste = pgste_set_pte(ptep, pgste, new);
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pgste_set_unlock(ptep, pgste);
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} else {
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*ptep = new;
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}
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}
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pte_t ptep_xchg_direct(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t new)
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{
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pgste_t pgste;
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pte_t old;
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pgste = ptep_xchg_start(mm, addr, ptep);
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old = ptep_flush_direct(mm, addr, ptep);
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ptep_xchg_commit(mm, addr, ptep, pgste, old, new);
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return old;
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}
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EXPORT_SYMBOL(ptep_xchg_direct);
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pte_t ptep_xchg_lazy(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t new)
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{
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pgste_t pgste;
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pte_t old;
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pgste = ptep_xchg_start(mm, addr, ptep);
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old = ptep_flush_lazy(mm, addr, ptep);
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ptep_xchg_commit(mm, addr, ptep, pgste, old, new);
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return old;
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}
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EXPORT_SYMBOL(ptep_xchg_lazy);
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pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep)
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{
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pgste_t pgste;
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pte_t old;
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pgste = ptep_xchg_start(mm, addr, ptep);
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old = ptep_flush_lazy(mm, addr, ptep);
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if (mm_has_pgste(mm)) {
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pgste = pgste_update_all(old, pgste, mm);
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pgste_set(ptep, pgste);
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}
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return old;
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}
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EXPORT_SYMBOL(ptep_modify_prot_start);
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void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pte)
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{
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pgste_t pgste;
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if (mm_has_pgste(mm)) {
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pgste = pgste_get(ptep);
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pgste_set_key(ptep, pgste, pte, mm);
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pgste = pgste_set_pte(ptep, pgste, pte);
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pgste_set_unlock(ptep, pgste);
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} else {
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*ptep = pte;
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}
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}
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EXPORT_SYMBOL(ptep_modify_prot_commit);
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static inline pmd_t pmdp_flush_direct(struct mm_struct *mm,
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unsigned long addr, pmd_t *pmdp)
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{
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int active, count;
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pmd_t old;
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old = *pmdp;
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if (pmd_val(old) & _SEGMENT_ENTRY_INVALID)
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return old;
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if (!MACHINE_HAS_IDTE) {
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__pmdp_csp(pmdp);
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return old;
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}
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active = (mm == current->active_mm) ? 1 : 0;
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count = atomic_add_return(0x10000, &mm->context.attach_count);
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if (MACHINE_HAS_TLB_LC && (count & 0xffff) <= active &&
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cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id())))
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__pmdp_idte_local(addr, pmdp);
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else
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__pmdp_idte(addr, pmdp);
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atomic_sub(0x10000, &mm->context.attach_count);
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return old;
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}
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static inline pmd_t pmdp_flush_lazy(struct mm_struct *mm,
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unsigned long addr, pmd_t *pmdp)
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{
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int active, count;
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pmd_t old;
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old = *pmdp;
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if (pmd_val(old) & _SEGMENT_ENTRY_INVALID)
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return old;
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active = (mm == current->active_mm) ? 1 : 0;
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count = atomic_add_return(0x10000, &mm->context.attach_count);
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if ((count & 0xffff) <= active) {
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pmd_val(*pmdp) |= _SEGMENT_ENTRY_INVALID;
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mm->context.flush_mm = 1;
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} else if (MACHINE_HAS_IDTE)
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__pmdp_idte(addr, pmdp);
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else
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__pmdp_csp(pmdp);
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atomic_sub(0x10000, &mm->context.attach_count);
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return old;
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}
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pmd_t pmdp_xchg_direct(struct mm_struct *mm, unsigned long addr,
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pmd_t *pmdp, pmd_t new)
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{
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pmd_t old;
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old = pmdp_flush_direct(mm, addr, pmdp);
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*pmdp = new;
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return old;
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}
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EXPORT_SYMBOL(pmdp_xchg_direct);
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pmd_t pmdp_xchg_lazy(struct mm_struct *mm, unsigned long addr,
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pmd_t *pmdp, pmd_t new)
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{
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pmd_t old;
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old = pmdp_flush_lazy(mm, addr, pmdp);
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*pmdp = new;
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return old;
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}
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EXPORT_SYMBOL(pmdp_xchg_lazy);
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
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pgtable_t pgtable)
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{
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struct list_head *lh = (struct list_head *) pgtable;
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assert_spin_locked(pmd_lockptr(mm, pmdp));
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/* FIFO */
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if (!pmd_huge_pte(mm, pmdp))
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INIT_LIST_HEAD(lh);
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else
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list_add(lh, (struct list_head *) pmd_huge_pte(mm, pmdp));
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pmd_huge_pte(mm, pmdp) = pgtable;
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}
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pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
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{
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struct list_head *lh;
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pgtable_t pgtable;
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pte_t *ptep;
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assert_spin_locked(pmd_lockptr(mm, pmdp));
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/* FIFO */
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pgtable = pmd_huge_pte(mm, pmdp);
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lh = (struct list_head *) pgtable;
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if (list_empty(lh))
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pmd_huge_pte(mm, pmdp) = NULL;
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else {
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pmd_huge_pte(mm, pmdp) = (pgtable_t) lh->next;
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list_del(lh);
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}
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ptep = (pte_t *) pgtable;
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pte_val(*ptep) = _PAGE_INVALID;
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ptep++;
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pte_val(*ptep) = _PAGE_INVALID;
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return pgtable;
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#ifdef CONFIG_PGSTE
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void ptep_set_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t entry)
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{
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pgste_t pgste;
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/* the mm_has_pgste() check is done in set_pte_at() */
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pgste = pgste_get_lock(ptep);
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pgste_val(pgste) &= ~_PGSTE_GPS_ZERO;
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pgste_set_key(ptep, pgste, entry, mm);
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pgste = pgste_set_pte(ptep, pgste, entry);
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pgste_set_unlock(ptep, pgste);
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}
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void ptep_set_notify(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
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{
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pgste_t pgste;
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pgste = pgste_get_lock(ptep);
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pgste_val(pgste) |= PGSTE_IN_BIT;
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pgste_set_unlock(ptep, pgste);
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}
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static void ptep_zap_swap_entry(struct mm_struct *mm, swp_entry_t entry)
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{
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if (!non_swap_entry(entry))
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dec_mm_counter(mm, MM_SWAPENTS);
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else if (is_migration_entry(entry)) {
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struct page *page = migration_entry_to_page(entry);
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dec_mm_counter(mm, mm_counter(page));
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}
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free_swap_and_cache(entry);
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}
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void ptep_zap_unused(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, int reset)
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{
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unsigned long pgstev;
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pgste_t pgste;
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pte_t pte;
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/* Zap unused and logically-zero pages */
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pgste = pgste_get_lock(ptep);
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pgstev = pgste_val(pgste);
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pte = *ptep;
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if (pte_swap(pte) &&
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((pgstev & _PGSTE_GPS_USAGE_MASK) == _PGSTE_GPS_USAGE_UNUSED ||
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(pgstev & _PGSTE_GPS_ZERO))) {
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ptep_zap_swap_entry(mm, pte_to_swp_entry(pte));
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pte_clear(mm, addr, ptep);
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}
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if (reset)
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pgste_val(pgste) &= ~_PGSTE_GPS_USAGE_MASK;
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pgste_set_unlock(ptep, pgste);
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}
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void ptep_zap_key(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
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{
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unsigned long ptev;
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pgste_t pgste;
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/* Clear storage key */
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pgste = pgste_get_lock(ptep);
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pgste_val(pgste) &= ~(PGSTE_ACC_BITS | PGSTE_FP_BIT |
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PGSTE_GR_BIT | PGSTE_GC_BIT);
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ptev = pte_val(*ptep);
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if (!(ptev & _PAGE_INVALID) && (ptev & _PAGE_WRITE))
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page_set_storage_key(ptev & PAGE_MASK, PAGE_DEFAULT_KEY, 1);
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pgste_set_unlock(ptep, pgste);
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}
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/*
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* Test and reset if a guest page is dirty
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*/
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bool test_and_clear_guest_dirty(struct mm_struct *mm, unsigned long addr)
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{
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spinlock_t *ptl;
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pgste_t pgste;
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pte_t *ptep;
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pte_t pte;
|
|
bool dirty;
|
|
|
|
ptep = get_locked_pte(mm, addr, &ptl);
|
|
if (unlikely(!ptep))
|
|
return false;
|
|
|
|
pgste = pgste_get_lock(ptep);
|
|
dirty = !!(pgste_val(pgste) & PGSTE_UC_BIT);
|
|
pgste_val(pgste) &= ~PGSTE_UC_BIT;
|
|
pte = *ptep;
|
|
if (dirty && (pte_val(pte) & _PAGE_PRESENT)) {
|
|
pgste = pgste_ipte_notify(mm, addr, ptep, pgste);
|
|
__ptep_ipte(addr, ptep);
|
|
if (MACHINE_HAS_ESOP || !(pte_val(pte) & _PAGE_WRITE))
|
|
pte_val(pte) |= _PAGE_PROTECT;
|
|
else
|
|
pte_val(pte) |= _PAGE_INVALID;
|
|
*ptep = pte;
|
|
}
|
|
pgste_set_unlock(ptep, pgste);
|
|
|
|
spin_unlock(ptl);
|
|
return dirty;
|
|
}
|
|
EXPORT_SYMBOL_GPL(test_and_clear_guest_dirty);
|
|
|
|
int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
|
|
unsigned char key, bool nq)
|
|
{
|
|
unsigned long keyul;
|
|
spinlock_t *ptl;
|
|
pgste_t old, new;
|
|
pte_t *ptep;
|
|
|
|
down_read(&mm->mmap_sem);
|
|
ptep = get_locked_pte(mm, addr, &ptl);
|
|
if (unlikely(!ptep)) {
|
|
up_read(&mm->mmap_sem);
|
|
return -EFAULT;
|
|
}
|
|
|
|
new = old = pgste_get_lock(ptep);
|
|
pgste_val(new) &= ~(PGSTE_GR_BIT | PGSTE_GC_BIT |
|
|
PGSTE_ACC_BITS | PGSTE_FP_BIT);
|
|
keyul = (unsigned long) key;
|
|
pgste_val(new) |= (keyul & (_PAGE_CHANGED | _PAGE_REFERENCED)) << 48;
|
|
pgste_val(new) |= (keyul & (_PAGE_ACC_BITS | _PAGE_FP_BIT)) << 56;
|
|
if (!(pte_val(*ptep) & _PAGE_INVALID)) {
|
|
unsigned long address, bits, skey;
|
|
|
|
address = pte_val(*ptep) & PAGE_MASK;
|
|
skey = (unsigned long) page_get_storage_key(address);
|
|
bits = skey & (_PAGE_CHANGED | _PAGE_REFERENCED);
|
|
skey = key & (_PAGE_ACC_BITS | _PAGE_FP_BIT);
|
|
/* Set storage key ACC and FP */
|
|
page_set_storage_key(address, skey, !nq);
|
|
/* Merge host changed & referenced into pgste */
|
|
pgste_val(new) |= bits << 52;
|
|
}
|
|
/* changing the guest storage key is considered a change of the page */
|
|
if ((pgste_val(new) ^ pgste_val(old)) &
|
|
(PGSTE_ACC_BITS | PGSTE_FP_BIT | PGSTE_GR_BIT | PGSTE_GC_BIT))
|
|
pgste_val(new) |= PGSTE_UC_BIT;
|
|
|
|
pgste_set_unlock(ptep, new);
|
|
pte_unmap_unlock(ptep, ptl);
|
|
up_read(&mm->mmap_sem);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(set_guest_storage_key);
|
|
|
|
unsigned char get_guest_storage_key(struct mm_struct *mm, unsigned long addr)
|
|
{
|
|
unsigned char key;
|
|
spinlock_t *ptl;
|
|
pgste_t pgste;
|
|
pte_t *ptep;
|
|
|
|
down_read(&mm->mmap_sem);
|
|
ptep = get_locked_pte(mm, addr, &ptl);
|
|
if (unlikely(!ptep)) {
|
|
up_read(&mm->mmap_sem);
|
|
return -EFAULT;
|
|
}
|
|
pgste = pgste_get_lock(ptep);
|
|
|
|
if (pte_val(*ptep) & _PAGE_INVALID) {
|
|
key = (pgste_val(pgste) & PGSTE_ACC_BITS) >> 56;
|
|
key |= (pgste_val(pgste) & PGSTE_FP_BIT) >> 56;
|
|
key |= (pgste_val(pgste) & PGSTE_GR_BIT) >> 48;
|
|
key |= (pgste_val(pgste) & PGSTE_GC_BIT) >> 48;
|
|
} else {
|
|
key = page_get_storage_key(pte_val(*ptep) & PAGE_MASK);
|
|
|
|
/* Reflect guest's logical view, not physical */
|
|
if (pgste_val(pgste) & PGSTE_GR_BIT)
|
|
key |= _PAGE_REFERENCED;
|
|
if (pgste_val(pgste) & PGSTE_GC_BIT)
|
|
key |= _PAGE_CHANGED;
|
|
}
|
|
|
|
pgste_set_unlock(ptep, pgste);
|
|
pte_unmap_unlock(ptep, ptl);
|
|
up_read(&mm->mmap_sem);
|
|
return key;
|
|
}
|
|
EXPORT_SYMBOL(get_guest_storage_key);
|
|
#endif
|