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1131 lines
29 KiB
1131 lines
29 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright IBM Corp. 2007, 2011 |
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* Author(s): Martin Schwidefsky <[email protected]> |
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*/ |
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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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|
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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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#include <asm/page-states.h> |
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|
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pgprot_t pgprot_writecombine(pgprot_t prot) |
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{ |
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/* |
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* mio_wb_bit_mask may be set on a different CPU, but it is only set |
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* once at init and only read afterwards. |
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*/ |
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return __pgprot(pgprot_val(prot) | mio_wb_bit_mask); |
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} |
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EXPORT_SYMBOL_GPL(pgprot_writecombine); |
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|
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pgprot_t pgprot_writethrough(pgprot_t prot) |
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{ |
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/* |
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* mio_wb_bit_mask may be set on a different CPU, but it is only set |
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* once at init and only read afterwards. |
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*/ |
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return __pgprot(pgprot_val(prot) & ~mio_wb_bit_mask); |
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} |
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EXPORT_SYMBOL_GPL(pgprot_writethrough); |
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|
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static inline void ptep_ipte_local(struct mm_struct *mm, unsigned long addr, |
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pte_t *ptep, int nodat) |
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{ |
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unsigned long opt, asce; |
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|
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if (MACHINE_HAS_TLB_GUEST) { |
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opt = 0; |
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asce = READ_ONCE(mm->context.gmap_asce); |
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if (asce == 0UL || nodat) |
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opt |= IPTE_NODAT; |
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if (asce != -1UL) { |
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asce = asce ? : mm->context.asce; |
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opt |= IPTE_GUEST_ASCE; |
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} |
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__ptep_ipte(addr, ptep, opt, asce, IPTE_LOCAL); |
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} else { |
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__ptep_ipte(addr, ptep, 0, 0, IPTE_LOCAL); |
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} |
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} |
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static inline void ptep_ipte_global(struct mm_struct *mm, unsigned long addr, |
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pte_t *ptep, int nodat) |
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{ |
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unsigned long opt, asce; |
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|
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if (MACHINE_HAS_TLB_GUEST) { |
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opt = 0; |
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asce = READ_ONCE(mm->context.gmap_asce); |
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if (asce == 0UL || nodat) |
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opt |= IPTE_NODAT; |
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if (asce != -1UL) { |
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asce = asce ? : mm->context.asce; |
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opt |= IPTE_GUEST_ASCE; |
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} |
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__ptep_ipte(addr, ptep, opt, asce, IPTE_GLOBAL); |
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} else { |
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__ptep_ipte(addr, ptep, 0, 0, IPTE_GLOBAL); |
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} |
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} |
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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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int nodat) |
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{ |
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pte_t old; |
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|
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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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atomic_inc(&mm->context.flush_count); |
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if (MACHINE_HAS_TLB_LC && |
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cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id()))) |
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ptep_ipte_local(mm, addr, ptep, nodat); |
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else |
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ptep_ipte_global(mm, addr, ptep, nodat); |
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atomic_dec(&mm->context.flush_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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int nodat) |
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{ |
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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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atomic_inc(&mm->context.flush_count); |
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if (cpumask_equal(&mm->context.cpu_attach_mask, |
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cpumask_of(smp_processor_id()))) { |
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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_global(mm, addr, ptep, nodat); |
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atomic_dec(&mm->context.flush_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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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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#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_uses_skeys(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_uses_skeys(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_pte_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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unsigned long bits; |
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bits = pgste_val(pgste) & (PGSTE_IN_BIT | PGSTE_VSIE_BIT); |
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if (bits) { |
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pgste_val(pgste) ^= bits; |
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ptep_notify(mm, addr, ptep, bits); |
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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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|
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if (mm_has_pgste(mm)) { |
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pgste = pgste_get_lock(ptep); |
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pgste = pgste_pte_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 pte_t 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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return old; |
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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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int nodat; |
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preempt_disable(); |
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pgste = ptep_xchg_start(mm, addr, ptep); |
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nodat = !!(pgste_val(pgste) & _PGSTE_GPS_NODAT); |
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old = ptep_flush_direct(mm, addr, ptep, nodat); |
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old = ptep_xchg_commit(mm, addr, ptep, pgste, old, new); |
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preempt_enable(); |
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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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int nodat; |
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preempt_disable(); |
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pgste = ptep_xchg_start(mm, addr, ptep); |
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nodat = !!(pgste_val(pgste) & _PGSTE_GPS_NODAT); |
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old = ptep_flush_lazy(mm, addr, ptep, nodat); |
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old = ptep_xchg_commit(mm, addr, ptep, pgste, old, new); |
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preempt_enable(); |
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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 vm_area_struct *vma, 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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int nodat; |
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struct mm_struct *mm = vma->vm_mm; |
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|
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preempt_disable(); |
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pgste = ptep_xchg_start(mm, addr, ptep); |
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nodat = !!(pgste_val(pgste) & _PGSTE_GPS_NODAT); |
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old = ptep_flush_lazy(mm, addr, ptep, nodat); |
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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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|
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void ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr, |
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pte_t *ptep, pte_t old_pte, pte_t pte) |
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{ |
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pgste_t pgste; |
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struct mm_struct *mm = vma->vm_mm; |
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|
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if (!MACHINE_HAS_NX) |
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pte_val(pte) &= ~_PAGE_NOEXEC; |
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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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preempt_enable(); |
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} |
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|
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static inline void pmdp_idte_local(struct mm_struct *mm, |
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unsigned long addr, pmd_t *pmdp) |
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{ |
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if (MACHINE_HAS_TLB_GUEST) |
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__pmdp_idte(addr, pmdp, IDTE_NODAT | IDTE_GUEST_ASCE, |
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mm->context.asce, IDTE_LOCAL); |
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else |
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__pmdp_idte(addr, pmdp, 0, 0, IDTE_LOCAL); |
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if (mm_has_pgste(mm) && mm->context.allow_gmap_hpage_1m) |
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gmap_pmdp_idte_local(mm, addr); |
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} |
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|
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static inline void pmdp_idte_global(struct mm_struct *mm, |
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unsigned long addr, pmd_t *pmdp) |
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{ |
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if (MACHINE_HAS_TLB_GUEST) { |
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__pmdp_idte(addr, pmdp, IDTE_NODAT | IDTE_GUEST_ASCE, |
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mm->context.asce, IDTE_GLOBAL); |
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if (mm_has_pgste(mm) && mm->context.allow_gmap_hpage_1m) |
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gmap_pmdp_idte_global(mm, addr); |
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} else if (MACHINE_HAS_IDTE) { |
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__pmdp_idte(addr, pmdp, 0, 0, IDTE_GLOBAL); |
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if (mm_has_pgste(mm) && mm->context.allow_gmap_hpage_1m) |
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gmap_pmdp_idte_global(mm, addr); |
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} else { |
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__pmdp_csp(pmdp); |
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if (mm_has_pgste(mm) && mm->context.allow_gmap_hpage_1m) |
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gmap_pmdp_csp(mm, addr); |
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} |
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} |
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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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pmd_t old; |
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|
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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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atomic_inc(&mm->context.flush_count); |
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if (MACHINE_HAS_TLB_LC && |
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cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id()))) |
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pmdp_idte_local(mm, addr, pmdp); |
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else |
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pmdp_idte_global(mm, addr, pmdp); |
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atomic_dec(&mm->context.flush_count); |
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return old; |
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} |
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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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pmd_t old; |
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|
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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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atomic_inc(&mm->context.flush_count); |
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if (cpumask_equal(&mm->context.cpu_attach_mask, |
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cpumask_of(smp_processor_id()))) { |
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pmd_val(*pmdp) |= _SEGMENT_ENTRY_INVALID; |
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mm->context.flush_mm = 1; |
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if (mm_has_pgste(mm)) |
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gmap_pmdp_invalidate(mm, addr); |
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} else { |
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pmdp_idte_global(mm, addr, pmdp); |
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} |
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atomic_dec(&mm->context.flush_count); |
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return old; |
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} |
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|
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#ifdef CONFIG_PGSTE |
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static pmd_t *pmd_alloc_map(struct mm_struct *mm, unsigned long addr) |
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{ |
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pgd_t *pgd; |
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p4d_t *p4d; |
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pud_t *pud; |
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pmd_t *pmd; |
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|
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pgd = pgd_offset(mm, addr); |
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p4d = p4d_alloc(mm, pgd, addr); |
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if (!p4d) |
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return NULL; |
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pud = pud_alloc(mm, p4d, addr); |
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if (!pud) |
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return NULL; |
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pmd = pmd_alloc(mm, pud, addr); |
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return pmd; |
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} |
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#endif |
|
|
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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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preempt_disable(); |
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old = pmdp_flush_direct(mm, addr, pmdp); |
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*pmdp = new; |
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preempt_enable(); |
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return old; |
|
} |
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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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pmd_t old; |
|
|
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preempt_disable(); |
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old = pmdp_flush_lazy(mm, addr, pmdp); |
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*pmdp = new; |
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preempt_enable(); |
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return old; |
|
} |
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EXPORT_SYMBOL(pmdp_xchg_lazy); |
|
|
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static inline void pudp_idte_local(struct mm_struct *mm, |
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unsigned long addr, pud_t *pudp) |
|
{ |
|
if (MACHINE_HAS_TLB_GUEST) |
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__pudp_idte(addr, pudp, IDTE_NODAT | IDTE_GUEST_ASCE, |
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mm->context.asce, IDTE_LOCAL); |
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else |
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__pudp_idte(addr, pudp, 0, 0, IDTE_LOCAL); |
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} |
|
|
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static inline void pudp_idte_global(struct mm_struct *mm, |
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unsigned long addr, pud_t *pudp) |
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{ |
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if (MACHINE_HAS_TLB_GUEST) |
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__pudp_idte(addr, pudp, IDTE_NODAT | IDTE_GUEST_ASCE, |
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mm->context.asce, IDTE_GLOBAL); |
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else if (MACHINE_HAS_IDTE) |
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__pudp_idte(addr, pudp, 0, 0, IDTE_GLOBAL); |
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else |
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/* |
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* Invalid bit position is the same for pmd and pud, so we can |
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* re-use _pmd_csp() here |
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*/ |
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__pmdp_csp((pmd_t *) pudp); |
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} |
|
|
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static inline pud_t pudp_flush_direct(struct mm_struct *mm, |
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unsigned long addr, pud_t *pudp) |
|
{ |
|
pud_t old; |
|
|
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old = *pudp; |
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if (pud_val(old) & _REGION_ENTRY_INVALID) |
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return old; |
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atomic_inc(&mm->context.flush_count); |
|
if (MACHINE_HAS_TLB_LC && |
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cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id()))) |
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pudp_idte_local(mm, addr, pudp); |
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else |
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pudp_idte_global(mm, addr, pudp); |
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atomic_dec(&mm->context.flush_count); |
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return old; |
|
} |
|
|
|
pud_t pudp_xchg_direct(struct mm_struct *mm, unsigned long addr, |
|
pud_t *pudp, pud_t new) |
|
{ |
|
pud_t old; |
|
|
|
preempt_disable(); |
|
old = pudp_flush_direct(mm, addr, pudp); |
|
*pudp = new; |
|
preempt_enable(); |
|
return old; |
|
} |
|
EXPORT_SYMBOL(pudp_xchg_direct); |
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
|
void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, |
|
pgtable_t pgtable) |
|
{ |
|
struct list_head *lh = (struct list_head *) pgtable; |
|
|
|
assert_spin_locked(pmd_lockptr(mm, pmdp)); |
|
|
|
/* FIFO */ |
|
if (!pmd_huge_pte(mm, pmdp)) |
|
INIT_LIST_HEAD(lh); |
|
else |
|
list_add(lh, (struct list_head *) pmd_huge_pte(mm, pmdp)); |
|
pmd_huge_pte(mm, pmdp) = pgtable; |
|
} |
|
|
|
pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp) |
|
{ |
|
struct list_head *lh; |
|
pgtable_t pgtable; |
|
pte_t *ptep; |
|
|
|
assert_spin_locked(pmd_lockptr(mm, pmdp)); |
|
|
|
/* FIFO */ |
|
pgtable = pmd_huge_pte(mm, pmdp); |
|
lh = (struct list_head *) pgtable; |
|
if (list_empty(lh)) |
|
pmd_huge_pte(mm, pmdp) = NULL; |
|
else { |
|
pmd_huge_pte(mm, pmdp) = (pgtable_t) lh->next; |
|
list_del(lh); |
|
} |
|
ptep = (pte_t *) pgtable; |
|
pte_val(*ptep) = _PAGE_INVALID; |
|
ptep++; |
|
pte_val(*ptep) = _PAGE_INVALID; |
|
return pgtable; |
|
} |
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
|
|
|
#ifdef CONFIG_PGSTE |
|
void ptep_set_pte_at(struct mm_struct *mm, unsigned long addr, |
|
pte_t *ptep, pte_t entry) |
|
{ |
|
pgste_t pgste; |
|
|
|
/* the mm_has_pgste() check is done in set_pte_at() */ |
|
preempt_disable(); |
|
pgste = pgste_get_lock(ptep); |
|
pgste_val(pgste) &= ~_PGSTE_GPS_ZERO; |
|
pgste_set_key(ptep, pgste, entry, mm); |
|
pgste = pgste_set_pte(ptep, pgste, entry); |
|
pgste_set_unlock(ptep, pgste); |
|
preempt_enable(); |
|
} |
|
|
|
void ptep_set_notify(struct mm_struct *mm, unsigned long addr, pte_t *ptep) |
|
{ |
|
pgste_t pgste; |
|
|
|
preempt_disable(); |
|
pgste = pgste_get_lock(ptep); |
|
pgste_val(pgste) |= PGSTE_IN_BIT; |
|
pgste_set_unlock(ptep, pgste); |
|
preempt_enable(); |
|
} |
|
|
|
/** |
|
* ptep_force_prot - change access rights of a locked pte |
|
* @mm: pointer to the process mm_struct |
|
* @addr: virtual address in the guest address space |
|
* @ptep: pointer to the page table entry |
|
* @prot: indicates guest access rights: PROT_NONE, PROT_READ or PROT_WRITE |
|
* @bit: pgste bit to set (e.g. for notification) |
|
* |
|
* Returns 0 if the access rights were changed and -EAGAIN if the current |
|
* and requested access rights are incompatible. |
|
*/ |
|
int ptep_force_prot(struct mm_struct *mm, unsigned long addr, |
|
pte_t *ptep, int prot, unsigned long bit) |
|
{ |
|
pte_t entry; |
|
pgste_t pgste; |
|
int pte_i, pte_p, nodat; |
|
|
|
pgste = pgste_get_lock(ptep); |
|
entry = *ptep; |
|
/* Check pte entry after all locks have been acquired */ |
|
pte_i = pte_val(entry) & _PAGE_INVALID; |
|
pte_p = pte_val(entry) & _PAGE_PROTECT; |
|
if ((pte_i && (prot != PROT_NONE)) || |
|
(pte_p && (prot & PROT_WRITE))) { |
|
pgste_set_unlock(ptep, pgste); |
|
return -EAGAIN; |
|
} |
|
/* Change access rights and set pgste bit */ |
|
nodat = !!(pgste_val(pgste) & _PGSTE_GPS_NODAT); |
|
if (prot == PROT_NONE && !pte_i) { |
|
ptep_flush_direct(mm, addr, ptep, nodat); |
|
pgste = pgste_update_all(entry, pgste, mm); |
|
pte_val(entry) |= _PAGE_INVALID; |
|
} |
|
if (prot == PROT_READ && !pte_p) { |
|
ptep_flush_direct(mm, addr, ptep, nodat); |
|
pte_val(entry) &= ~_PAGE_INVALID; |
|
pte_val(entry) |= _PAGE_PROTECT; |
|
} |
|
pgste_val(pgste) |= bit; |
|
pgste = pgste_set_pte(ptep, pgste, entry); |
|
pgste_set_unlock(ptep, pgste); |
|
return 0; |
|
} |
|
|
|
int ptep_shadow_pte(struct mm_struct *mm, unsigned long saddr, |
|
pte_t *sptep, pte_t *tptep, pte_t pte) |
|
{ |
|
pgste_t spgste, tpgste; |
|
pte_t spte, tpte; |
|
int rc = -EAGAIN; |
|
|
|
if (!(pte_val(*tptep) & _PAGE_INVALID)) |
|
return 0; /* already shadowed */ |
|
spgste = pgste_get_lock(sptep); |
|
spte = *sptep; |
|
if (!(pte_val(spte) & _PAGE_INVALID) && |
|
!((pte_val(spte) & _PAGE_PROTECT) && |
|
!(pte_val(pte) & _PAGE_PROTECT))) { |
|
pgste_val(spgste) |= PGSTE_VSIE_BIT; |
|
tpgste = pgste_get_lock(tptep); |
|
pte_val(tpte) = (pte_val(spte) & PAGE_MASK) | |
|
(pte_val(pte) & _PAGE_PROTECT); |
|
/* don't touch the storage key - it belongs to parent pgste */ |
|
tpgste = pgste_set_pte(tptep, tpgste, tpte); |
|
pgste_set_unlock(tptep, tpgste); |
|
rc = 1; |
|
} |
|
pgste_set_unlock(sptep, spgste); |
|
return rc; |
|
} |
|
|
|
void ptep_unshadow_pte(struct mm_struct *mm, unsigned long saddr, pte_t *ptep) |
|
{ |
|
pgste_t pgste; |
|
int nodat; |
|
|
|
pgste = pgste_get_lock(ptep); |
|
/* notifier is called by the caller */ |
|
nodat = !!(pgste_val(pgste) & _PGSTE_GPS_NODAT); |
|
ptep_flush_direct(mm, saddr, ptep, nodat); |
|
/* don't touch the storage key - it belongs to parent pgste */ |
|
pgste = pgste_set_pte(ptep, pgste, __pte(_PAGE_INVALID)); |
|
pgste_set_unlock(ptep, pgste); |
|
} |
|
|
|
static void ptep_zap_swap_entry(struct mm_struct *mm, swp_entry_t entry) |
|
{ |
|
if (!non_swap_entry(entry)) |
|
dec_mm_counter(mm, MM_SWAPENTS); |
|
else if (is_migration_entry(entry)) { |
|
struct page *page = migration_entry_to_page(entry); |
|
|
|
dec_mm_counter(mm, mm_counter(page)); |
|
} |
|
free_swap_and_cache(entry); |
|
} |
|
|
|
void ptep_zap_unused(struct mm_struct *mm, unsigned long addr, |
|
pte_t *ptep, int reset) |
|
{ |
|
unsigned long pgstev; |
|
pgste_t pgste; |
|
pte_t pte; |
|
|
|
/* Zap unused and logically-zero pages */ |
|
preempt_disable(); |
|
pgste = pgste_get_lock(ptep); |
|
pgstev = pgste_val(pgste); |
|
pte = *ptep; |
|
if (!reset && pte_swap(pte) && |
|
((pgstev & _PGSTE_GPS_USAGE_MASK) == _PGSTE_GPS_USAGE_UNUSED || |
|
(pgstev & _PGSTE_GPS_ZERO))) { |
|
ptep_zap_swap_entry(mm, pte_to_swp_entry(pte)); |
|
pte_clear(mm, addr, ptep); |
|
} |
|
if (reset) |
|
pgste_val(pgste) &= ~_PGSTE_GPS_USAGE_MASK; |
|
pgste_set_unlock(ptep, pgste); |
|
preempt_enable(); |
|
} |
|
|
|
void ptep_zap_key(struct mm_struct *mm, unsigned long addr, pte_t *ptep) |
|
{ |
|
unsigned long ptev; |
|
pgste_t pgste; |
|
|
|
/* Clear storage key ACC and F, but set R/C */ |
|
preempt_disable(); |
|
pgste = pgste_get_lock(ptep); |
|
pgste_val(pgste) &= ~(PGSTE_ACC_BITS | PGSTE_FP_BIT); |
|
pgste_val(pgste) |= PGSTE_GR_BIT | PGSTE_GC_BIT; |
|
ptev = pte_val(*ptep); |
|
if (!(ptev & _PAGE_INVALID) && (ptev & _PAGE_WRITE)) |
|
page_set_storage_key(ptev & PAGE_MASK, PAGE_DEFAULT_KEY, 1); |
|
pgste_set_unlock(ptep, pgste); |
|
preempt_enable(); |
|
} |
|
|
|
/* |
|
* Test and reset if a guest page is dirty |
|
*/ |
|
bool ptep_test_and_clear_uc(struct mm_struct *mm, unsigned long addr, |
|
pte_t *ptep) |
|
{ |
|
pgste_t pgste; |
|
pte_t pte; |
|
bool dirty; |
|
int nodat; |
|
|
|
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_pte_notify(mm, addr, ptep, pgste); |
|
nodat = !!(pgste_val(pgste) & _PGSTE_GPS_NODAT); |
|
ptep_ipte_global(mm, addr, ptep, nodat); |
|
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); |
|
return dirty; |
|
} |
|
EXPORT_SYMBOL_GPL(ptep_test_and_clear_uc); |
|
|
|
int set_guest_storage_key(struct mm_struct *mm, unsigned long addr, |
|
unsigned char key, bool nq) |
|
{ |
|
unsigned long keyul, paddr; |
|
spinlock_t *ptl; |
|
pgste_t old, new; |
|
pmd_t *pmdp; |
|
pte_t *ptep; |
|
|
|
pmdp = pmd_alloc_map(mm, addr); |
|
if (unlikely(!pmdp)) |
|
return -EFAULT; |
|
|
|
ptl = pmd_lock(mm, pmdp); |
|
if (!pmd_present(*pmdp)) { |
|
spin_unlock(ptl); |
|
return -EFAULT; |
|
} |
|
|
|
if (pmd_large(*pmdp)) { |
|
paddr = pmd_val(*pmdp) & HPAGE_MASK; |
|
paddr |= addr & ~HPAGE_MASK; |
|
/* |
|
* Huge pmds need quiescing operations, they are |
|
* always mapped. |
|
*/ |
|
page_set_storage_key(paddr, key, 1); |
|
spin_unlock(ptl); |
|
return 0; |
|
} |
|
spin_unlock(ptl); |
|
|
|
ptep = pte_alloc_map_lock(mm, pmdp, addr, &ptl); |
|
if (unlikely(!ptep)) |
|
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 bits, skey; |
|
|
|
paddr = pte_val(*ptep) & PAGE_MASK; |
|
skey = (unsigned long) page_get_storage_key(paddr); |
|
bits = skey & (_PAGE_CHANGED | _PAGE_REFERENCED); |
|
skey = key & (_PAGE_ACC_BITS | _PAGE_FP_BIT); |
|
/* Set storage key ACC and FP */ |
|
page_set_storage_key(paddr, 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); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(set_guest_storage_key); |
|
|
|
/** |
|
* Conditionally set a guest storage key (handling csske). |
|
* oldkey will be updated when either mr or mc is set and a pointer is given. |
|
* |
|
* Returns 0 if a guests storage key update wasn't necessary, 1 if the guest |
|
* storage key was updated and -EFAULT on access errors. |
|
*/ |
|
int cond_set_guest_storage_key(struct mm_struct *mm, unsigned long addr, |
|
unsigned char key, unsigned char *oldkey, |
|
bool nq, bool mr, bool mc) |
|
{ |
|
unsigned char tmp, mask = _PAGE_ACC_BITS | _PAGE_FP_BIT; |
|
int rc; |
|
|
|
/* we can drop the pgste lock between getting and setting the key */ |
|
if (mr | mc) { |
|
rc = get_guest_storage_key(current->mm, addr, &tmp); |
|
if (rc) |
|
return rc; |
|
if (oldkey) |
|
*oldkey = tmp; |
|
if (!mr) |
|
mask |= _PAGE_REFERENCED; |
|
if (!mc) |
|
mask |= _PAGE_CHANGED; |
|
if (!((tmp ^ key) & mask)) |
|
return 0; |
|
} |
|
rc = set_guest_storage_key(current->mm, addr, key, nq); |
|
return rc < 0 ? rc : 1; |
|
} |
|
EXPORT_SYMBOL(cond_set_guest_storage_key); |
|
|
|
/** |
|
* Reset a guest reference bit (rrbe), returning the reference and changed bit. |
|
* |
|
* Returns < 0 in case of error, otherwise the cc to be reported to the guest. |
|
*/ |
|
int reset_guest_reference_bit(struct mm_struct *mm, unsigned long addr) |
|
{ |
|
spinlock_t *ptl; |
|
unsigned long paddr; |
|
pgste_t old, new; |
|
pmd_t *pmdp; |
|
pte_t *ptep; |
|
int cc = 0; |
|
|
|
pmdp = pmd_alloc_map(mm, addr); |
|
if (unlikely(!pmdp)) |
|
return -EFAULT; |
|
|
|
ptl = pmd_lock(mm, pmdp); |
|
if (!pmd_present(*pmdp)) { |
|
spin_unlock(ptl); |
|
return -EFAULT; |
|
} |
|
|
|
if (pmd_large(*pmdp)) { |
|
paddr = pmd_val(*pmdp) & HPAGE_MASK; |
|
paddr |= addr & ~HPAGE_MASK; |
|
cc = page_reset_referenced(paddr); |
|
spin_unlock(ptl); |
|
return cc; |
|
} |
|
spin_unlock(ptl); |
|
|
|
ptep = pte_alloc_map_lock(mm, pmdp, addr, &ptl); |
|
if (unlikely(!ptep)) |
|
return -EFAULT; |
|
|
|
new = old = pgste_get_lock(ptep); |
|
/* Reset guest reference bit only */ |
|
pgste_val(new) &= ~PGSTE_GR_BIT; |
|
|
|
if (!(pte_val(*ptep) & _PAGE_INVALID)) { |
|
paddr = pte_val(*ptep) & PAGE_MASK; |
|
cc = page_reset_referenced(paddr); |
|
/* Merge real referenced bit into host-set */ |
|
pgste_val(new) |= ((unsigned long) cc << 53) & PGSTE_HR_BIT; |
|
} |
|
/* Reflect guest's logical view, not physical */ |
|
cc |= (pgste_val(old) & (PGSTE_GR_BIT | PGSTE_GC_BIT)) >> 49; |
|
/* Changing the guest storage key is considered a change of the page */ |
|
if ((pgste_val(new) ^ pgste_val(old)) & PGSTE_GR_BIT) |
|
pgste_val(new) |= PGSTE_UC_BIT; |
|
|
|
pgste_set_unlock(ptep, new); |
|
pte_unmap_unlock(ptep, ptl); |
|
return cc; |
|
} |
|
EXPORT_SYMBOL(reset_guest_reference_bit); |
|
|
|
int get_guest_storage_key(struct mm_struct *mm, unsigned long addr, |
|
unsigned char *key) |
|
{ |
|
unsigned long paddr; |
|
spinlock_t *ptl; |
|
pgste_t pgste; |
|
pmd_t *pmdp; |
|
pte_t *ptep; |
|
|
|
pmdp = pmd_alloc_map(mm, addr); |
|
if (unlikely(!pmdp)) |
|
return -EFAULT; |
|
|
|
ptl = pmd_lock(mm, pmdp); |
|
if (!pmd_present(*pmdp)) { |
|
/* Not yet mapped memory has a zero key */ |
|
spin_unlock(ptl); |
|
*key = 0; |
|
return 0; |
|
} |
|
|
|
if (pmd_large(*pmdp)) { |
|
paddr = pmd_val(*pmdp) & HPAGE_MASK; |
|
paddr |= addr & ~HPAGE_MASK; |
|
*key = page_get_storage_key(paddr); |
|
spin_unlock(ptl); |
|
return 0; |
|
} |
|
spin_unlock(ptl); |
|
|
|
ptep = pte_alloc_map_lock(mm, pmdp, addr, &ptl); |
|
if (unlikely(!ptep)) |
|
return -EFAULT; |
|
|
|
pgste = pgste_get_lock(ptep); |
|
*key = (pgste_val(pgste) & (PGSTE_ACC_BITS | PGSTE_FP_BIT)) >> 56; |
|
paddr = pte_val(*ptep) & PAGE_MASK; |
|
if (!(pte_val(*ptep) & _PAGE_INVALID)) |
|
*key = page_get_storage_key(paddr); |
|
/* Reflect guest's logical view, not physical */ |
|
*key |= (pgste_val(pgste) & (PGSTE_GR_BIT | PGSTE_GC_BIT)) >> 48; |
|
pgste_set_unlock(ptep, pgste); |
|
pte_unmap_unlock(ptep, ptl); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(get_guest_storage_key); |
|
|
|
/** |
|
* pgste_perform_essa - perform ESSA actions on the PGSTE. |
|
* @mm: the memory context. It must have PGSTEs, no check is performed here! |
|
* @hva: the host virtual address of the page whose PGSTE is to be processed |
|
* @orc: the specific action to perform, see the ESSA_SET_* macros. |
|
* @oldpte: the PTE will be saved there if the pointer is not NULL. |
|
* @oldpgste: the old PGSTE will be saved there if the pointer is not NULL. |
|
* |
|
* Return: 1 if the page is to be added to the CBRL, otherwise 0, |
|
* or < 0 in case of error. -EINVAL is returned for invalid values |
|
* of orc, -EFAULT for invalid addresses. |
|
*/ |
|
int pgste_perform_essa(struct mm_struct *mm, unsigned long hva, int orc, |
|
unsigned long *oldpte, unsigned long *oldpgste) |
|
{ |
|
unsigned long pgstev; |
|
spinlock_t *ptl; |
|
pgste_t pgste; |
|
pte_t *ptep; |
|
int res = 0; |
|
|
|
WARN_ON_ONCE(orc > ESSA_MAX); |
|
if (unlikely(orc > ESSA_MAX)) |
|
return -EINVAL; |
|
ptep = get_locked_pte(mm, hva, &ptl); |
|
if (unlikely(!ptep)) |
|
return -EFAULT; |
|
pgste = pgste_get_lock(ptep); |
|
pgstev = pgste_val(pgste); |
|
if (oldpte) |
|
*oldpte = pte_val(*ptep); |
|
if (oldpgste) |
|
*oldpgste = pgstev; |
|
|
|
switch (orc) { |
|
case ESSA_GET_STATE: |
|
break; |
|
case ESSA_SET_STABLE: |
|
pgstev &= ~(_PGSTE_GPS_USAGE_MASK | _PGSTE_GPS_NODAT); |
|
pgstev |= _PGSTE_GPS_USAGE_STABLE; |
|
break; |
|
case ESSA_SET_UNUSED: |
|
pgstev &= ~_PGSTE_GPS_USAGE_MASK; |
|
pgstev |= _PGSTE_GPS_USAGE_UNUSED; |
|
if (pte_val(*ptep) & _PAGE_INVALID) |
|
res = 1; |
|
break; |
|
case ESSA_SET_VOLATILE: |
|
pgstev &= ~_PGSTE_GPS_USAGE_MASK; |
|
pgstev |= _PGSTE_GPS_USAGE_VOLATILE; |
|
if (pte_val(*ptep) & _PAGE_INVALID) |
|
res = 1; |
|
break; |
|
case ESSA_SET_POT_VOLATILE: |
|
pgstev &= ~_PGSTE_GPS_USAGE_MASK; |
|
if (!(pte_val(*ptep) & _PAGE_INVALID)) { |
|
pgstev |= _PGSTE_GPS_USAGE_POT_VOLATILE; |
|
break; |
|
} |
|
if (pgstev & _PGSTE_GPS_ZERO) { |
|
pgstev |= _PGSTE_GPS_USAGE_VOLATILE; |
|
break; |
|
} |
|
if (!(pgstev & PGSTE_GC_BIT)) { |
|
pgstev |= _PGSTE_GPS_USAGE_VOLATILE; |
|
res = 1; |
|
break; |
|
} |
|
break; |
|
case ESSA_SET_STABLE_RESIDENT: |
|
pgstev &= ~_PGSTE_GPS_USAGE_MASK; |
|
pgstev |= _PGSTE_GPS_USAGE_STABLE; |
|
/* |
|
* Since the resident state can go away any time after this |
|
* call, we will not make this page resident. We can revisit |
|
* this decision if a guest will ever start using this. |
|
*/ |
|
break; |
|
case ESSA_SET_STABLE_IF_RESIDENT: |
|
if (!(pte_val(*ptep) & _PAGE_INVALID)) { |
|
pgstev &= ~_PGSTE_GPS_USAGE_MASK; |
|
pgstev |= _PGSTE_GPS_USAGE_STABLE; |
|
} |
|
break; |
|
case ESSA_SET_STABLE_NODAT: |
|
pgstev &= ~_PGSTE_GPS_USAGE_MASK; |
|
pgstev |= _PGSTE_GPS_USAGE_STABLE | _PGSTE_GPS_NODAT; |
|
break; |
|
default: |
|
/* we should never get here! */ |
|
break; |
|
} |
|
/* If we are discarding a page, set it to logical zero */ |
|
if (res) |
|
pgstev |= _PGSTE_GPS_ZERO; |
|
|
|
pgste_val(pgste) = pgstev; |
|
pgste_set_unlock(ptep, pgste); |
|
pte_unmap_unlock(ptep, ptl); |
|
return res; |
|
} |
|
EXPORT_SYMBOL(pgste_perform_essa); |
|
|
|
/** |
|
* set_pgste_bits - set specific PGSTE bits. |
|
* @mm: the memory context. It must have PGSTEs, no check is performed here! |
|
* @hva: the host virtual address of the page whose PGSTE is to be processed |
|
* @bits: a bitmask representing the bits that will be touched |
|
* @value: the values of the bits to be written. Only the bits in the mask |
|
* will be written. |
|
* |
|
* Return: 0 on success, < 0 in case of error. |
|
*/ |
|
int set_pgste_bits(struct mm_struct *mm, unsigned long hva, |
|
unsigned long bits, unsigned long value) |
|
{ |
|
spinlock_t *ptl; |
|
pgste_t new; |
|
pte_t *ptep; |
|
|
|
ptep = get_locked_pte(mm, hva, &ptl); |
|
if (unlikely(!ptep)) |
|
return -EFAULT; |
|
new = pgste_get_lock(ptep); |
|
|
|
pgste_val(new) &= ~bits; |
|
pgste_val(new) |= value & bits; |
|
|
|
pgste_set_unlock(ptep, new); |
|
pte_unmap_unlock(ptep, ptl); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(set_pgste_bits); |
|
|
|
/** |
|
* get_pgste - get the current PGSTE for the given address. |
|
* @mm: the memory context. It must have PGSTEs, no check is performed here! |
|
* @hva: the host virtual address of the page whose PGSTE is to be processed |
|
* @pgstep: will be written with the current PGSTE for the given address. |
|
* |
|
* Return: 0 on success, < 0 in case of error. |
|
*/ |
|
int get_pgste(struct mm_struct *mm, unsigned long hva, unsigned long *pgstep) |
|
{ |
|
spinlock_t *ptl; |
|
pte_t *ptep; |
|
|
|
ptep = get_locked_pte(mm, hva, &ptl); |
|
if (unlikely(!ptep)) |
|
return -EFAULT; |
|
*pgstep = pgste_val(pgste_get(ptep)); |
|
pte_unmap_unlock(ptep, ptl); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(get_pgste); |
|
#endif
|
|
|