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![Paul Mackerras](/assets/img/avatar_default.png)
This allows both the guest and the host to use the referenced (R) and changed (C) bits in the guest hashed page table. The guest has a view of R and C that is maintained in the guest_rpte field of the revmap entry for the HPTE, and the host has a view that is maintained in the rmap entry for the associated gfn. Both view are updated from the guest HPT. If a bit (R or C) is zero in either view, it will be initially set to zero in the HPTE (or HPTEs), until set to 1 by hardware. When an HPTE is removed for any reason, the R and C bits from the HPTE are ORed into both views. We have to be careful to read the R and C bits from the HPTE after invalidating it, but before unlocking it, in case of any late updates by the hardware. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
816 lines
22 KiB
C
816 lines
22 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* Copyright 2010-2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
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*/
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/kvm.h>
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#include <linux/kvm_host.h>
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#include <linux/hugetlb.h>
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#include <linux/module.h>
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#include <asm/tlbflush.h>
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#include <asm/kvm_ppc.h>
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#include <asm/kvm_book3s.h>
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#include <asm/mmu-hash64.h>
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#include <asm/hvcall.h>
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#include <asm/synch.h>
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#include <asm/ppc-opcode.h>
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/*
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* Since this file is built in even if KVM is a module, we need
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* a local copy of this function for the case where kvm_main.c is
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* modular.
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*/
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static struct kvm_memory_slot *builtin_gfn_to_memslot(struct kvm *kvm,
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gfn_t gfn)
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{
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struct kvm_memslots *slots;
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struct kvm_memory_slot *memslot;
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slots = kvm_memslots(kvm);
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kvm_for_each_memslot(memslot, slots)
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if (gfn >= memslot->base_gfn &&
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gfn < memslot->base_gfn + memslot->npages)
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return memslot;
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return NULL;
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}
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/* Translate address of a vmalloc'd thing to a linear map address */
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static void *real_vmalloc_addr(void *x)
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{
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unsigned long addr = (unsigned long) x;
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pte_t *p;
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p = find_linux_pte(swapper_pg_dir, addr);
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if (!p || !pte_present(*p))
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return NULL;
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/* assume we don't have huge pages in vmalloc space... */
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addr = (pte_pfn(*p) << PAGE_SHIFT) | (addr & ~PAGE_MASK);
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return __va(addr);
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}
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/*
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* Add this HPTE into the chain for the real page.
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* Must be called with the chain locked; it unlocks the chain.
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*/
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void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev,
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unsigned long *rmap, long pte_index, int realmode)
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{
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struct revmap_entry *head, *tail;
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unsigned long i;
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if (*rmap & KVMPPC_RMAP_PRESENT) {
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i = *rmap & KVMPPC_RMAP_INDEX;
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head = &kvm->arch.revmap[i];
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if (realmode)
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head = real_vmalloc_addr(head);
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tail = &kvm->arch.revmap[head->back];
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if (realmode)
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tail = real_vmalloc_addr(tail);
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rev->forw = i;
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rev->back = head->back;
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tail->forw = pte_index;
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head->back = pte_index;
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} else {
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rev->forw = rev->back = pte_index;
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i = pte_index;
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}
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smp_wmb();
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*rmap = i | KVMPPC_RMAP_REFERENCED | KVMPPC_RMAP_PRESENT; /* unlock */
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}
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EXPORT_SYMBOL_GPL(kvmppc_add_revmap_chain);
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/* Remove this HPTE from the chain for a real page */
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static void remove_revmap_chain(struct kvm *kvm, long pte_index,
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struct revmap_entry *rev,
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unsigned long hpte_v, unsigned long hpte_r)
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{
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struct revmap_entry *next, *prev;
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unsigned long gfn, ptel, head;
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struct kvm_memory_slot *memslot;
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unsigned long *rmap;
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unsigned long rcbits;
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rcbits = hpte_r & (HPTE_R_R | HPTE_R_C);
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ptel = rev->guest_rpte |= rcbits;
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gfn = hpte_rpn(ptel, hpte_page_size(hpte_v, ptel));
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memslot = builtin_gfn_to_memslot(kvm, gfn);
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if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
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return;
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rmap = real_vmalloc_addr(&memslot->rmap[gfn - memslot->base_gfn]);
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lock_rmap(rmap);
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head = *rmap & KVMPPC_RMAP_INDEX;
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next = real_vmalloc_addr(&kvm->arch.revmap[rev->forw]);
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prev = real_vmalloc_addr(&kvm->arch.revmap[rev->back]);
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next->back = rev->back;
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prev->forw = rev->forw;
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if (head == pte_index) {
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head = rev->forw;
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if (head == pte_index)
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*rmap &= ~(KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_INDEX);
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else
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*rmap = (*rmap & ~KVMPPC_RMAP_INDEX) | head;
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}
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*rmap |= rcbits << KVMPPC_RMAP_RC_SHIFT;
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unlock_rmap(rmap);
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}
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static pte_t lookup_linux_pte(struct kvm_vcpu *vcpu, unsigned long hva,
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int writing, unsigned long *pte_sizep)
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{
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pte_t *ptep;
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unsigned long ps = *pte_sizep;
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unsigned int shift;
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ptep = find_linux_pte_or_hugepte(vcpu->arch.pgdir, hva, &shift);
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if (!ptep)
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return __pte(0);
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if (shift)
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*pte_sizep = 1ul << shift;
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else
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*pte_sizep = PAGE_SIZE;
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if (ps > *pte_sizep)
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return __pte(0);
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if (!pte_present(*ptep))
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return __pte(0);
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return kvmppc_read_update_linux_pte(ptep, writing);
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}
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static inline void unlock_hpte(unsigned long *hpte, unsigned long hpte_v)
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{
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asm volatile(PPC_RELEASE_BARRIER "" : : : "memory");
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hpte[0] = hpte_v;
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}
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long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
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long pte_index, unsigned long pteh, unsigned long ptel)
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{
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struct kvm *kvm = vcpu->kvm;
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unsigned long i, pa, gpa, gfn, psize;
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unsigned long slot_fn, hva;
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unsigned long *hpte;
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struct revmap_entry *rev;
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unsigned long g_ptel = ptel;
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struct kvm_memory_slot *memslot;
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unsigned long *physp, pte_size;
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unsigned long is_io;
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unsigned long *rmap;
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pte_t pte;
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unsigned int writing;
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unsigned long mmu_seq;
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unsigned long rcbits;
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bool realmode = vcpu->arch.vcore->vcore_state == VCORE_RUNNING;
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psize = hpte_page_size(pteh, ptel);
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if (!psize)
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return H_PARAMETER;
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writing = hpte_is_writable(ptel);
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pteh &= ~(HPTE_V_HVLOCK | HPTE_V_ABSENT | HPTE_V_VALID);
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/* used later to detect if we might have been invalidated */
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mmu_seq = kvm->mmu_notifier_seq;
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smp_rmb();
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/* Find the memslot (if any) for this address */
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gpa = (ptel & HPTE_R_RPN) & ~(psize - 1);
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gfn = gpa >> PAGE_SHIFT;
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memslot = builtin_gfn_to_memslot(kvm, gfn);
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pa = 0;
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is_io = ~0ul;
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rmap = NULL;
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if (!(memslot && !(memslot->flags & KVM_MEMSLOT_INVALID))) {
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/* PPC970 can't do emulated MMIO */
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if (!cpu_has_feature(CPU_FTR_ARCH_206))
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return H_PARAMETER;
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/* Emulated MMIO - mark this with key=31 */
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pteh |= HPTE_V_ABSENT;
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ptel |= HPTE_R_KEY_HI | HPTE_R_KEY_LO;
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goto do_insert;
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}
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/* Check if the requested page fits entirely in the memslot. */
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if (!slot_is_aligned(memslot, psize))
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return H_PARAMETER;
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slot_fn = gfn - memslot->base_gfn;
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rmap = &memslot->rmap[slot_fn];
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if (!kvm->arch.using_mmu_notifiers) {
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physp = kvm->arch.slot_phys[memslot->id];
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if (!physp)
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return H_PARAMETER;
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physp += slot_fn;
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if (realmode)
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physp = real_vmalloc_addr(physp);
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pa = *physp;
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if (!pa)
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return H_TOO_HARD;
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is_io = pa & (HPTE_R_I | HPTE_R_W);
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pte_size = PAGE_SIZE << (pa & KVMPPC_PAGE_ORDER_MASK);
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pa &= PAGE_MASK;
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} else {
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/* Translate to host virtual address */
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hva = gfn_to_hva_memslot(memslot, gfn);
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/* Look up the Linux PTE for the backing page */
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pte_size = psize;
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pte = lookup_linux_pte(vcpu, hva, writing, &pte_size);
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if (pte_present(pte)) {
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if (writing && !pte_write(pte))
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/* make the actual HPTE be read-only */
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ptel = hpte_make_readonly(ptel);
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is_io = hpte_cache_bits(pte_val(pte));
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pa = pte_pfn(pte) << PAGE_SHIFT;
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}
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}
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if (pte_size < psize)
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return H_PARAMETER;
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if (pa && pte_size > psize)
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pa |= gpa & (pte_size - 1);
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ptel &= ~(HPTE_R_PP0 - psize);
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ptel |= pa;
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if (pa)
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pteh |= HPTE_V_VALID;
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else
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pteh |= HPTE_V_ABSENT;
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/* Check WIMG */
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if (is_io != ~0ul && !hpte_cache_flags_ok(ptel, is_io)) {
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if (is_io)
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return H_PARAMETER;
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/*
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* Allow guest to map emulated device memory as
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* uncacheable, but actually make it cacheable.
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*/
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ptel &= ~(HPTE_R_W|HPTE_R_I|HPTE_R_G);
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ptel |= HPTE_R_M;
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}
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/* Find and lock the HPTEG slot to use */
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do_insert:
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if (pte_index >= HPT_NPTE)
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return H_PARAMETER;
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if (likely((flags & H_EXACT) == 0)) {
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pte_index &= ~7UL;
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hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
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for (i = 0; i < 8; ++i) {
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if ((*hpte & HPTE_V_VALID) == 0 &&
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try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID |
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HPTE_V_ABSENT))
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break;
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hpte += 2;
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}
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if (i == 8) {
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/*
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* Since try_lock_hpte doesn't retry (not even stdcx.
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* failures), it could be that there is a free slot
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* but we transiently failed to lock it. Try again,
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* actually locking each slot and checking it.
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*/
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hpte -= 16;
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for (i = 0; i < 8; ++i) {
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while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
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cpu_relax();
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if (!(*hpte & (HPTE_V_VALID | HPTE_V_ABSENT)))
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break;
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*hpte &= ~HPTE_V_HVLOCK;
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hpte += 2;
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}
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if (i == 8)
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return H_PTEG_FULL;
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}
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pte_index += i;
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} else {
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hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
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if (!try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID |
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HPTE_V_ABSENT)) {
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/* Lock the slot and check again */
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while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
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cpu_relax();
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if (*hpte & (HPTE_V_VALID | HPTE_V_ABSENT)) {
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*hpte &= ~HPTE_V_HVLOCK;
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return H_PTEG_FULL;
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}
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}
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}
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/* Save away the guest's idea of the second HPTE dword */
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rev = &kvm->arch.revmap[pte_index];
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if (realmode)
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rev = real_vmalloc_addr(rev);
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if (rev)
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rev->guest_rpte = g_ptel;
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/* Link HPTE into reverse-map chain */
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if (pteh & HPTE_V_VALID) {
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if (realmode)
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rmap = real_vmalloc_addr(rmap);
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lock_rmap(rmap);
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/* Check for pending invalidations under the rmap chain lock */
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if (kvm->arch.using_mmu_notifiers &&
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mmu_notifier_retry(vcpu, mmu_seq)) {
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/* inval in progress, write a non-present HPTE */
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pteh |= HPTE_V_ABSENT;
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pteh &= ~HPTE_V_VALID;
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unlock_rmap(rmap);
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} else {
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kvmppc_add_revmap_chain(kvm, rev, rmap, pte_index,
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realmode);
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/* Only set R/C in real HPTE if already set in *rmap */
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rcbits = *rmap >> KVMPPC_RMAP_RC_SHIFT;
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ptel &= rcbits | ~(HPTE_R_R | HPTE_R_C);
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}
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}
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hpte[1] = ptel;
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/* Write the first HPTE dword, unlocking the HPTE and making it valid */
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eieio();
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hpte[0] = pteh;
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asm volatile("ptesync" : : : "memory");
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vcpu->arch.gpr[4] = pte_index;
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return H_SUCCESS;
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}
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EXPORT_SYMBOL_GPL(kvmppc_h_enter);
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#define LOCK_TOKEN (*(u32 *)(&get_paca()->lock_token))
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static inline int try_lock_tlbie(unsigned int *lock)
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{
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unsigned int tmp, old;
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unsigned int token = LOCK_TOKEN;
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asm volatile("1:lwarx %1,0,%2\n"
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" cmpwi cr0,%1,0\n"
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" bne 2f\n"
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" stwcx. %3,0,%2\n"
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" bne- 1b\n"
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" isync\n"
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"2:"
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: "=&r" (tmp), "=&r" (old)
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: "r" (lock), "r" (token)
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: "cc", "memory");
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return old == 0;
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}
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long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags,
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unsigned long pte_index, unsigned long avpn,
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unsigned long va)
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{
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struct kvm *kvm = vcpu->kvm;
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unsigned long *hpte;
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unsigned long v, r, rb;
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struct revmap_entry *rev;
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if (pte_index >= HPT_NPTE)
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return H_PARAMETER;
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hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
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while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
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cpu_relax();
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if ((hpte[0] & (HPTE_V_ABSENT | HPTE_V_VALID)) == 0 ||
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((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn) ||
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((flags & H_ANDCOND) && (hpte[0] & avpn) != 0)) {
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hpte[0] &= ~HPTE_V_HVLOCK;
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return H_NOT_FOUND;
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}
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rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
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v = hpte[0] & ~HPTE_V_HVLOCK;
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if (v & HPTE_V_VALID) {
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hpte[0] &= ~HPTE_V_VALID;
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rb = compute_tlbie_rb(v, hpte[1], pte_index);
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if (!(flags & H_LOCAL) && atomic_read(&kvm->online_vcpus) > 1) {
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while (!try_lock_tlbie(&kvm->arch.tlbie_lock))
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cpu_relax();
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asm volatile("ptesync" : : : "memory");
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asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync"
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: : "r" (rb), "r" (kvm->arch.lpid));
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asm volatile("ptesync" : : : "memory");
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kvm->arch.tlbie_lock = 0;
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} else {
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asm volatile("ptesync" : : : "memory");
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asm volatile("tlbiel %0" : : "r" (rb));
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asm volatile("ptesync" : : : "memory");
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}
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/* Read PTE low word after tlbie to get final R/C values */
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remove_revmap_chain(kvm, pte_index, rev, v, hpte[1]);
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}
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r = rev->guest_rpte;
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unlock_hpte(hpte, 0);
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vcpu->arch.gpr[4] = v;
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vcpu->arch.gpr[5] = r;
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return H_SUCCESS;
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}
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long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu)
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{
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struct kvm *kvm = vcpu->kvm;
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unsigned long *args = &vcpu->arch.gpr[4];
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unsigned long *hp, *hptes[4], tlbrb[4];
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long int i, j, k, n, found, indexes[4];
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unsigned long flags, req, pte_index, rcbits;
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long int local = 0;
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long int ret = H_SUCCESS;
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struct revmap_entry *rev, *revs[4];
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if (atomic_read(&kvm->online_vcpus) == 1)
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local = 1;
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for (i = 0; i < 4 && ret == H_SUCCESS; ) {
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n = 0;
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for (; i < 4; ++i) {
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j = i * 2;
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pte_index = args[j];
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flags = pte_index >> 56;
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pte_index &= ((1ul << 56) - 1);
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req = flags >> 6;
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flags &= 3;
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if (req == 3) { /* no more requests */
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i = 4;
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break;
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}
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if (req != 1 || flags == 3 || pte_index >= HPT_NPTE) {
|
|
/* parameter error */
|
|
args[j] = ((0xa0 | flags) << 56) + pte_index;
|
|
ret = H_PARAMETER;
|
|
break;
|
|
}
|
|
hp = (unsigned long *)
|
|
(kvm->arch.hpt_virt + (pte_index << 4));
|
|
/* to avoid deadlock, don't spin except for first */
|
|
if (!try_lock_hpte(hp, HPTE_V_HVLOCK)) {
|
|
if (n)
|
|
break;
|
|
while (!try_lock_hpte(hp, HPTE_V_HVLOCK))
|
|
cpu_relax();
|
|
}
|
|
found = 0;
|
|
if (hp[0] & (HPTE_V_ABSENT | HPTE_V_VALID)) {
|
|
switch (flags & 3) {
|
|
case 0: /* absolute */
|
|
found = 1;
|
|
break;
|
|
case 1: /* andcond */
|
|
if (!(hp[0] & args[j + 1]))
|
|
found = 1;
|
|
break;
|
|
case 2: /* AVPN */
|
|
if ((hp[0] & ~0x7fUL) == args[j + 1])
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
if (!found) {
|
|
hp[0] &= ~HPTE_V_HVLOCK;
|
|
args[j] = ((0x90 | flags) << 56) + pte_index;
|
|
continue;
|
|
}
|
|
|
|
args[j] = ((0x80 | flags) << 56) + pte_index;
|
|
rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
|
|
|
|
if (!(hp[0] & HPTE_V_VALID)) {
|
|
/* insert R and C bits from PTE */
|
|
rcbits = rev->guest_rpte & (HPTE_R_R|HPTE_R_C);
|
|
args[j] |= rcbits << (56 - 5);
|
|
continue;
|
|
}
|
|
|
|
hp[0] &= ~HPTE_V_VALID; /* leave it locked */
|
|
tlbrb[n] = compute_tlbie_rb(hp[0], hp[1], pte_index);
|
|
indexes[n] = j;
|
|
hptes[n] = hp;
|
|
revs[n] = rev;
|
|
++n;
|
|
}
|
|
|
|
if (!n)
|
|
break;
|
|
|
|
/* Now that we've collected a batch, do the tlbies */
|
|
if (!local) {
|
|
while(!try_lock_tlbie(&kvm->arch.tlbie_lock))
|
|
cpu_relax();
|
|
asm volatile("ptesync" : : : "memory");
|
|
for (k = 0; k < n; ++k)
|
|
asm volatile(PPC_TLBIE(%1,%0) : :
|
|
"r" (tlbrb[k]),
|
|
"r" (kvm->arch.lpid));
|
|
asm volatile("eieio; tlbsync; ptesync" : : : "memory");
|
|
kvm->arch.tlbie_lock = 0;
|
|
} else {
|
|
asm volatile("ptesync" : : : "memory");
|
|
for (k = 0; k < n; ++k)
|
|
asm volatile("tlbiel %0" : : "r" (tlbrb[k]));
|
|
asm volatile("ptesync" : : : "memory");
|
|
}
|
|
|
|
/* Read PTE low words after tlbie to get final R/C values */
|
|
for (k = 0; k < n; ++k) {
|
|
j = indexes[k];
|
|
pte_index = args[j] & ((1ul << 56) - 1);
|
|
hp = hptes[k];
|
|
rev = revs[k];
|
|
remove_revmap_chain(kvm, pte_index, rev, hp[0], hp[1]);
|
|
rcbits = rev->guest_rpte & (HPTE_R_R|HPTE_R_C);
|
|
args[j] |= rcbits << (56 - 5);
|
|
hp[0] = 0;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags,
|
|
unsigned long pte_index, unsigned long avpn,
|
|
unsigned long va)
|
|
{
|
|
struct kvm *kvm = vcpu->kvm;
|
|
unsigned long *hpte;
|
|
struct revmap_entry *rev;
|
|
unsigned long v, r, rb, mask, bits;
|
|
|
|
if (pte_index >= HPT_NPTE)
|
|
return H_PARAMETER;
|
|
|
|
hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
|
|
while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
|
|
cpu_relax();
|
|
if ((hpte[0] & (HPTE_V_ABSENT | HPTE_V_VALID)) == 0 ||
|
|
((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn)) {
|
|
hpte[0] &= ~HPTE_V_HVLOCK;
|
|
return H_NOT_FOUND;
|
|
}
|
|
|
|
if (atomic_read(&kvm->online_vcpus) == 1)
|
|
flags |= H_LOCAL;
|
|
v = hpte[0];
|
|
bits = (flags << 55) & HPTE_R_PP0;
|
|
bits |= (flags << 48) & HPTE_R_KEY_HI;
|
|
bits |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO);
|
|
|
|
/* Update guest view of 2nd HPTE dword */
|
|
mask = HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N |
|
|
HPTE_R_KEY_HI | HPTE_R_KEY_LO;
|
|
rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
|
|
if (rev) {
|
|
r = (rev->guest_rpte & ~mask) | bits;
|
|
rev->guest_rpte = r;
|
|
}
|
|
r = (hpte[1] & ~mask) | bits;
|
|
|
|
/* Update HPTE */
|
|
if (v & HPTE_V_VALID) {
|
|
rb = compute_tlbie_rb(v, r, pte_index);
|
|
hpte[0] = v & ~HPTE_V_VALID;
|
|
if (!(flags & H_LOCAL)) {
|
|
while(!try_lock_tlbie(&kvm->arch.tlbie_lock))
|
|
cpu_relax();
|
|
asm volatile("ptesync" : : : "memory");
|
|
asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync"
|
|
: : "r" (rb), "r" (kvm->arch.lpid));
|
|
asm volatile("ptesync" : : : "memory");
|
|
kvm->arch.tlbie_lock = 0;
|
|
} else {
|
|
asm volatile("ptesync" : : : "memory");
|
|
asm volatile("tlbiel %0" : : "r" (rb));
|
|
asm volatile("ptesync" : : : "memory");
|
|
}
|
|
}
|
|
hpte[1] = r;
|
|
eieio();
|
|
hpte[0] = v & ~HPTE_V_HVLOCK;
|
|
asm volatile("ptesync" : : : "memory");
|
|
return H_SUCCESS;
|
|
}
|
|
|
|
long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags,
|
|
unsigned long pte_index)
|
|
{
|
|
struct kvm *kvm = vcpu->kvm;
|
|
unsigned long *hpte, v, r;
|
|
int i, n = 1;
|
|
struct revmap_entry *rev = NULL;
|
|
|
|
if (pte_index >= HPT_NPTE)
|
|
return H_PARAMETER;
|
|
if (flags & H_READ_4) {
|
|
pte_index &= ~3;
|
|
n = 4;
|
|
}
|
|
rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
|
|
for (i = 0; i < n; ++i, ++pte_index) {
|
|
hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
|
|
v = hpte[0] & ~HPTE_V_HVLOCK;
|
|
r = hpte[1];
|
|
if (v & HPTE_V_ABSENT) {
|
|
v &= ~HPTE_V_ABSENT;
|
|
v |= HPTE_V_VALID;
|
|
}
|
|
if (v & HPTE_V_VALID)
|
|
r = rev[i].guest_rpte | (r & (HPTE_R_R | HPTE_R_C));
|
|
vcpu->arch.gpr[4 + i * 2] = v;
|
|
vcpu->arch.gpr[5 + i * 2] = r;
|
|
}
|
|
return H_SUCCESS;
|
|
}
|
|
|
|
void kvmppc_invalidate_hpte(struct kvm *kvm, unsigned long *hptep,
|
|
unsigned long pte_index)
|
|
{
|
|
unsigned long rb;
|
|
|
|
hptep[0] &= ~HPTE_V_VALID;
|
|
rb = compute_tlbie_rb(hptep[0], hptep[1], pte_index);
|
|
while (!try_lock_tlbie(&kvm->arch.tlbie_lock))
|
|
cpu_relax();
|
|
asm volatile("ptesync" : : : "memory");
|
|
asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync"
|
|
: : "r" (rb), "r" (kvm->arch.lpid));
|
|
asm volatile("ptesync" : : : "memory");
|
|
kvm->arch.tlbie_lock = 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(kvmppc_invalidate_hpte);
|
|
|
|
static int slb_base_page_shift[4] = {
|
|
24, /* 16M */
|
|
16, /* 64k */
|
|
34, /* 16G */
|
|
20, /* 1M, unsupported */
|
|
};
|
|
|
|
long kvmppc_hv_find_lock_hpte(struct kvm *kvm, gva_t eaddr, unsigned long slb_v,
|
|
unsigned long valid)
|
|
{
|
|
unsigned int i;
|
|
unsigned int pshift;
|
|
unsigned long somask;
|
|
unsigned long vsid, hash;
|
|
unsigned long avpn;
|
|
unsigned long *hpte;
|
|
unsigned long mask, val;
|
|
unsigned long v, r;
|
|
|
|
/* Get page shift, work out hash and AVPN etc. */
|
|
mask = SLB_VSID_B | HPTE_V_AVPN | HPTE_V_SECONDARY;
|
|
val = 0;
|
|
pshift = 12;
|
|
if (slb_v & SLB_VSID_L) {
|
|
mask |= HPTE_V_LARGE;
|
|
val |= HPTE_V_LARGE;
|
|
pshift = slb_base_page_shift[(slb_v & SLB_VSID_LP) >> 4];
|
|
}
|
|
if (slb_v & SLB_VSID_B_1T) {
|
|
somask = (1UL << 40) - 1;
|
|
vsid = (slb_v & ~SLB_VSID_B) >> SLB_VSID_SHIFT_1T;
|
|
vsid ^= vsid << 25;
|
|
} else {
|
|
somask = (1UL << 28) - 1;
|
|
vsid = (slb_v & ~SLB_VSID_B) >> SLB_VSID_SHIFT;
|
|
}
|
|
hash = (vsid ^ ((eaddr & somask) >> pshift)) & HPT_HASH_MASK;
|
|
avpn = slb_v & ~(somask >> 16); /* also includes B */
|
|
avpn |= (eaddr & somask) >> 16;
|
|
|
|
if (pshift >= 24)
|
|
avpn &= ~((1UL << (pshift - 16)) - 1);
|
|
else
|
|
avpn &= ~0x7fUL;
|
|
val |= avpn;
|
|
|
|
for (;;) {
|
|
hpte = (unsigned long *)(kvm->arch.hpt_virt + (hash << 7));
|
|
|
|
for (i = 0; i < 16; i += 2) {
|
|
/* Read the PTE racily */
|
|
v = hpte[i] & ~HPTE_V_HVLOCK;
|
|
|
|
/* Check valid/absent, hash, segment size and AVPN */
|
|
if (!(v & valid) || (v & mask) != val)
|
|
continue;
|
|
|
|
/* Lock the PTE and read it under the lock */
|
|
while (!try_lock_hpte(&hpte[i], HPTE_V_HVLOCK))
|
|
cpu_relax();
|
|
v = hpte[i] & ~HPTE_V_HVLOCK;
|
|
r = hpte[i+1];
|
|
|
|
/*
|
|
* Check the HPTE again, including large page size
|
|
* Since we don't currently allow any MPSS (mixed
|
|
* page-size segment) page sizes, it is sufficient
|
|
* to check against the actual page size.
|
|
*/
|
|
if ((v & valid) && (v & mask) == val &&
|
|
hpte_page_size(v, r) == (1ul << pshift))
|
|
/* Return with the HPTE still locked */
|
|
return (hash << 3) + (i >> 1);
|
|
|
|
/* Unlock and move on */
|
|
hpte[i] = v;
|
|
}
|
|
|
|
if (val & HPTE_V_SECONDARY)
|
|
break;
|
|
val |= HPTE_V_SECONDARY;
|
|
hash = hash ^ HPT_HASH_MASK;
|
|
}
|
|
return -1;
|
|
}
|
|
EXPORT_SYMBOL(kvmppc_hv_find_lock_hpte);
|
|
|
|
/*
|
|
* Called in real mode to check whether an HPTE not found fault
|
|
* is due to accessing a paged-out page or an emulated MMIO page,
|
|
* or if a protection fault is due to accessing a page that the
|
|
* guest wanted read/write access to but which we made read-only.
|
|
* Returns a possibly modified status (DSISR) value if not
|
|
* (i.e. pass the interrupt to the guest),
|
|
* -1 to pass the fault up to host kernel mode code, -2 to do that
|
|
* and also load the instruction word (for MMIO emulation),
|
|
* or 0 if we should make the guest retry the access.
|
|
*/
|
|
long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr,
|
|
unsigned long slb_v, unsigned int status, bool data)
|
|
{
|
|
struct kvm *kvm = vcpu->kvm;
|
|
long int index;
|
|
unsigned long v, r, gr;
|
|
unsigned long *hpte;
|
|
unsigned long valid;
|
|
struct revmap_entry *rev;
|
|
unsigned long pp, key;
|
|
|
|
/* For protection fault, expect to find a valid HPTE */
|
|
valid = HPTE_V_VALID;
|
|
if (status & DSISR_NOHPTE)
|
|
valid |= HPTE_V_ABSENT;
|
|
|
|
index = kvmppc_hv_find_lock_hpte(kvm, addr, slb_v, valid);
|
|
if (index < 0) {
|
|
if (status & DSISR_NOHPTE)
|
|
return status; /* there really was no HPTE */
|
|
return 0; /* for prot fault, HPTE disappeared */
|
|
}
|
|
hpte = (unsigned long *)(kvm->arch.hpt_virt + (index << 4));
|
|
v = hpte[0] & ~HPTE_V_HVLOCK;
|
|
r = hpte[1];
|
|
rev = real_vmalloc_addr(&kvm->arch.revmap[index]);
|
|
gr = rev->guest_rpte;
|
|
|
|
unlock_hpte(hpte, v);
|
|
|
|
/* For not found, if the HPTE is valid by now, retry the instruction */
|
|
if ((status & DSISR_NOHPTE) && (v & HPTE_V_VALID))
|
|
return 0;
|
|
|
|
/* Check access permissions to the page */
|
|
pp = gr & (HPTE_R_PP0 | HPTE_R_PP);
|
|
key = (vcpu->arch.shregs.msr & MSR_PR) ? SLB_VSID_KP : SLB_VSID_KS;
|
|
status &= ~DSISR_NOHPTE; /* DSISR_NOHPTE == SRR1_ISI_NOPT */
|
|
if (!data) {
|
|
if (gr & (HPTE_R_N | HPTE_R_G))
|
|
return status | SRR1_ISI_N_OR_G;
|
|
if (!hpte_read_permission(pp, slb_v & key))
|
|
return status | SRR1_ISI_PROT;
|
|
} else if (status & DSISR_ISSTORE) {
|
|
/* check write permission */
|
|
if (!hpte_write_permission(pp, slb_v & key))
|
|
return status | DSISR_PROTFAULT;
|
|
} else {
|
|
if (!hpte_read_permission(pp, slb_v & key))
|
|
return status | DSISR_PROTFAULT;
|
|
}
|
|
|
|
/* Check storage key, if applicable */
|
|
if (data && (vcpu->arch.shregs.msr & MSR_DR)) {
|
|
unsigned int perm = hpte_get_skey_perm(gr, vcpu->arch.amr);
|
|
if (status & DSISR_ISSTORE)
|
|
perm >>= 1;
|
|
if (perm & 1)
|
|
return status | DSISR_KEYFAULT;
|
|
}
|
|
|
|
/* Save HPTE info for virtual-mode handler */
|
|
vcpu->arch.pgfault_addr = addr;
|
|
vcpu->arch.pgfault_index = index;
|
|
vcpu->arch.pgfault_hpte[0] = v;
|
|
vcpu->arch.pgfault_hpte[1] = r;
|
|
|
|
/* Check the storage key to see if it is possibly emulated MMIO */
|
|
if (data && (vcpu->arch.shregs.msr & MSR_IR) &&
|
|
(r & (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) ==
|
|
(HPTE_R_KEY_HI | HPTE_R_KEY_LO))
|
|
return -2; /* MMIO emulation - load instr word */
|
|
|
|
return -1; /* send fault up to host kernel mode */
|
|
}
|