409 lines
10 KiB
C
409 lines
10 KiB
C
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/*
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* Copyright (C) 2009 SUSE Linux Products GmbH. All rights reserved.
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*
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* Authors:
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* Alexander Graf <agraf@suse.de>
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* Kevin Wolf <mail@kevin-wolf.de>
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*
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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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/kvm_host.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/machdep.h>
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#include <asm/mmu_context.h>
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#include <asm/hw_irq.h>
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#define PTE_SIZE 12
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#define VSID_ALL 0
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/* #define DEBUG_MMU */
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/* #define DEBUG_SLB */
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#ifdef DEBUG_MMU
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#define dprintk_mmu(a, ...) printk(KERN_INFO a, __VA_ARGS__)
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#else
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#define dprintk_mmu(a, ...) do { } while(0)
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#endif
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#ifdef DEBUG_SLB
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#define dprintk_slb(a, ...) printk(KERN_INFO a, __VA_ARGS__)
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#else
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#define dprintk_slb(a, ...) do { } while(0)
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#endif
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static void invalidate_pte(struct hpte_cache *pte)
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{
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dprintk_mmu("KVM: Flushing SPT %d: 0x%llx (0x%llx) -> 0x%llx\n",
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i, pte->pte.eaddr, pte->pte.vpage, pte->host_va);
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ppc_md.hpte_invalidate(pte->slot, pte->host_va,
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MMU_PAGE_4K, MMU_SEGSIZE_256M,
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false);
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pte->host_va = 0;
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kvm_release_pfn_dirty(pte->pfn);
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}
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void kvmppc_mmu_pte_flush(struct kvm_vcpu *vcpu, u64 guest_ea, u64 ea_mask)
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{
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int i;
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dprintk_mmu("KVM: Flushing %d Shadow PTEs: 0x%llx & 0x%llx\n",
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vcpu->arch.hpte_cache_offset, guest_ea, ea_mask);
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BUG_ON(vcpu->arch.hpte_cache_offset > HPTEG_CACHE_NUM);
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guest_ea &= ea_mask;
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for (i = 0; i < vcpu->arch.hpte_cache_offset; i++) {
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struct hpte_cache *pte;
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pte = &vcpu->arch.hpte_cache[i];
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if (!pte->host_va)
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continue;
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if ((pte->pte.eaddr & ea_mask) == guest_ea) {
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invalidate_pte(pte);
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}
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}
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/* Doing a complete flush -> start from scratch */
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if (!ea_mask)
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vcpu->arch.hpte_cache_offset = 0;
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}
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void kvmppc_mmu_pte_vflush(struct kvm_vcpu *vcpu, u64 guest_vp, u64 vp_mask)
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{
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int i;
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dprintk_mmu("KVM: Flushing %d Shadow vPTEs: 0x%llx & 0x%llx\n",
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vcpu->arch.hpte_cache_offset, guest_vp, vp_mask);
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BUG_ON(vcpu->arch.hpte_cache_offset > HPTEG_CACHE_NUM);
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guest_vp &= vp_mask;
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for (i = 0; i < vcpu->arch.hpte_cache_offset; i++) {
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struct hpte_cache *pte;
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pte = &vcpu->arch.hpte_cache[i];
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if (!pte->host_va)
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continue;
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if ((pte->pte.vpage & vp_mask) == guest_vp) {
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invalidate_pte(pte);
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}
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}
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}
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void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, u64 pa_start, u64 pa_end)
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{
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int i;
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dprintk_mmu("KVM: Flushing %d Shadow pPTEs: 0x%llx & 0x%llx\n",
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vcpu->arch.hpte_cache_offset, guest_pa, pa_mask);
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BUG_ON(vcpu->arch.hpte_cache_offset > HPTEG_CACHE_NUM);
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for (i = 0; i < vcpu->arch.hpte_cache_offset; i++) {
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struct hpte_cache *pte;
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pte = &vcpu->arch.hpte_cache[i];
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if (!pte->host_va)
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continue;
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if ((pte->pte.raddr >= pa_start) &&
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(pte->pte.raddr < pa_end)) {
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invalidate_pte(pte);
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}
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}
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}
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struct kvmppc_pte *kvmppc_mmu_find_pte(struct kvm_vcpu *vcpu, u64 ea, bool data)
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{
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int i;
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u64 guest_vp;
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guest_vp = vcpu->arch.mmu.ea_to_vp(vcpu, ea, false);
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for (i=0; i<vcpu->arch.hpte_cache_offset; i++) {
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struct hpte_cache *pte;
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pte = &vcpu->arch.hpte_cache[i];
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if (!pte->host_va)
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continue;
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if (pte->pte.vpage == guest_vp)
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return &pte->pte;
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}
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return NULL;
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}
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static int kvmppc_mmu_hpte_cache_next(struct kvm_vcpu *vcpu)
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{
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if (vcpu->arch.hpte_cache_offset == HPTEG_CACHE_NUM)
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kvmppc_mmu_pte_flush(vcpu, 0, 0);
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return vcpu->arch.hpte_cache_offset++;
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}
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/* We keep 512 gvsid->hvsid entries, mapping the guest ones to the array using
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* a hash, so we don't waste cycles on looping */
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static u16 kvmppc_sid_hash(struct kvm_vcpu *vcpu, u64 gvsid)
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{
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return (u16)(((gvsid >> (SID_MAP_BITS * 7)) & SID_MAP_MASK) ^
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((gvsid >> (SID_MAP_BITS * 6)) & SID_MAP_MASK) ^
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((gvsid >> (SID_MAP_BITS * 5)) & SID_MAP_MASK) ^
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((gvsid >> (SID_MAP_BITS * 4)) & SID_MAP_MASK) ^
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((gvsid >> (SID_MAP_BITS * 3)) & SID_MAP_MASK) ^
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((gvsid >> (SID_MAP_BITS * 2)) & SID_MAP_MASK) ^
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((gvsid >> (SID_MAP_BITS * 1)) & SID_MAP_MASK) ^
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((gvsid >> (SID_MAP_BITS * 0)) & SID_MAP_MASK));
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}
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static struct kvmppc_sid_map *find_sid_vsid(struct kvm_vcpu *vcpu, u64 gvsid)
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{
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struct kvmppc_sid_map *map;
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u16 sid_map_mask;
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if (vcpu->arch.msr & MSR_PR)
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gvsid |= VSID_PR;
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sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
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map = &to_book3s(vcpu)->sid_map[sid_map_mask];
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if (map->guest_vsid == gvsid) {
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dprintk_slb("SLB: Searching 0x%llx -> 0x%llx\n",
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gvsid, map->host_vsid);
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return map;
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}
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map = &to_book3s(vcpu)->sid_map[SID_MAP_MASK - sid_map_mask];
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if (map->guest_vsid == gvsid) {
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dprintk_slb("SLB: Searching 0x%llx -> 0x%llx\n",
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gvsid, map->host_vsid);
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return map;
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}
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dprintk_slb("SLB: Searching 0x%llx -> not found\n", gvsid);
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return NULL;
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}
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int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte)
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{
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pfn_t hpaddr;
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ulong hash, hpteg, va;
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u64 vsid;
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int ret;
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int rflags = 0x192;
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int vflags = 0;
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int attempt = 0;
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struct kvmppc_sid_map *map;
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/* Get host physical address for gpa */
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hpaddr = gfn_to_pfn(vcpu->kvm, orig_pte->raddr >> PAGE_SHIFT);
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if (kvm_is_error_hva(hpaddr)) {
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printk(KERN_INFO "Couldn't get guest page for gfn %llx!\n", orig_pte->eaddr);
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return -EINVAL;
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}
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hpaddr <<= PAGE_SHIFT;
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#if PAGE_SHIFT == 12
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#elif PAGE_SHIFT == 16
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hpaddr |= orig_pte->raddr & 0xf000;
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#else
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#error Unknown page size
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#endif
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/* and write the mapping ea -> hpa into the pt */
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vcpu->arch.mmu.esid_to_vsid(vcpu, orig_pte->eaddr >> SID_SHIFT, &vsid);
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map = find_sid_vsid(vcpu, vsid);
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if (!map) {
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kvmppc_mmu_map_segment(vcpu, orig_pte->eaddr);
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map = find_sid_vsid(vcpu, vsid);
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}
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BUG_ON(!map);
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vsid = map->host_vsid;
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va = hpt_va(orig_pte->eaddr, vsid, MMU_SEGSIZE_256M);
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if (!orig_pte->may_write)
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rflags |= HPTE_R_PP;
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else
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mark_page_dirty(vcpu->kvm, orig_pte->raddr >> PAGE_SHIFT);
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if (!orig_pte->may_execute)
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rflags |= HPTE_R_N;
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hash = hpt_hash(va, PTE_SIZE, MMU_SEGSIZE_256M);
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map_again:
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hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
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/* In case we tried normal mapping already, let's nuke old entries */
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if (attempt > 1)
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if (ppc_md.hpte_remove(hpteg) < 0)
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return -1;
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ret = ppc_md.hpte_insert(hpteg, va, hpaddr, rflags, vflags, MMU_PAGE_4K, MMU_SEGSIZE_256M);
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if (ret < 0) {
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/* If we couldn't map a primary PTE, try a secondary */
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#ifdef USE_SECONDARY
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hash = ~hash;
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attempt++;
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if (attempt % 2)
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vflags = HPTE_V_SECONDARY;
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else
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vflags = 0;
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#else
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attempt = 2;
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#endif
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goto map_again;
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} else {
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int hpte_id = kvmppc_mmu_hpte_cache_next(vcpu);
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struct hpte_cache *pte = &vcpu->arch.hpte_cache[hpte_id];
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dprintk_mmu("KVM: %c%c Map 0x%llx: [%lx] 0x%lx (0x%llx) -> %lx\n",
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((rflags & HPTE_R_PP) == 3) ? '-' : 'w',
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(rflags & HPTE_R_N) ? '-' : 'x',
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orig_pte->eaddr, hpteg, va, orig_pte->vpage, hpaddr);
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pte->slot = hpteg + (ret & 7);
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pte->host_va = va;
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pte->pte = *orig_pte;
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pte->pfn = hpaddr >> PAGE_SHIFT;
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}
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return 0;
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}
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static struct kvmppc_sid_map *create_sid_map(struct kvm_vcpu *vcpu, u64 gvsid)
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{
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struct kvmppc_sid_map *map;
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struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
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u16 sid_map_mask;
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static int backwards_map = 0;
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if (vcpu->arch.msr & MSR_PR)
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gvsid |= VSID_PR;
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/* We might get collisions that trap in preceding order, so let's
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map them differently */
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sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
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if (backwards_map)
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sid_map_mask = SID_MAP_MASK - sid_map_mask;
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map = &to_book3s(vcpu)->sid_map[sid_map_mask];
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/* Make sure we're taking the other map next time */
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backwards_map = !backwards_map;
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/* Uh-oh ... out of mappings. Let's flush! */
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if (vcpu_book3s->vsid_next == vcpu_book3s->vsid_max) {
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vcpu_book3s->vsid_next = vcpu_book3s->vsid_first;
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memset(vcpu_book3s->sid_map, 0,
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sizeof(struct kvmppc_sid_map) * SID_MAP_NUM);
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kvmppc_mmu_pte_flush(vcpu, 0, 0);
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kvmppc_mmu_flush_segments(vcpu);
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}
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map->host_vsid = vcpu_book3s->vsid_next++;
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map->guest_vsid = gvsid;
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map->valid = true;
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return map;
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}
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static int kvmppc_mmu_next_segment(struct kvm_vcpu *vcpu, ulong esid)
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{
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int i;
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int max_slb_size = 64;
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int found_inval = -1;
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int r;
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if (!get_paca()->kvm_slb_max)
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get_paca()->kvm_slb_max = 1;
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/* Are we overwriting? */
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for (i = 1; i < get_paca()->kvm_slb_max; i++) {
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if (!(get_paca()->kvm_slb[i].esid & SLB_ESID_V))
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found_inval = i;
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else if ((get_paca()->kvm_slb[i].esid & ESID_MASK) == esid)
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return i;
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}
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/* Found a spare entry that was invalidated before */
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if (found_inval > 0)
|
||
|
|
return found_inval;
|
||
|
|
|
||
|
|
/* No spare invalid entry, so create one */
|
||
|
|
|
||
|
|
if (mmu_slb_size < 64)
|
||
|
|
max_slb_size = mmu_slb_size;
|
||
|
|
|
||
|
|
/* Overflowing -> purge */
|
||
|
|
if ((get_paca()->kvm_slb_max) == max_slb_size)
|
||
|
|
kvmppc_mmu_flush_segments(vcpu);
|
||
|
|
|
||
|
|
r = get_paca()->kvm_slb_max;
|
||
|
|
get_paca()->kvm_slb_max++;
|
||
|
|
|
||
|
|
return r;
|
||
|
|
}
|
||
|
|
|
||
|
|
int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr)
|
||
|
|
{
|
||
|
|
u64 esid = eaddr >> SID_SHIFT;
|
||
|
|
u64 slb_esid = (eaddr & ESID_MASK) | SLB_ESID_V;
|
||
|
|
u64 slb_vsid = SLB_VSID_USER;
|
||
|
|
u64 gvsid;
|
||
|
|
int slb_index;
|
||
|
|
struct kvmppc_sid_map *map;
|
||
|
|
|
||
|
|
slb_index = kvmppc_mmu_next_segment(vcpu, eaddr & ESID_MASK);
|
||
|
|
|
||
|
|
if (vcpu->arch.mmu.esid_to_vsid(vcpu, esid, &gvsid)) {
|
||
|
|
/* Invalidate an entry */
|
||
|
|
get_paca()->kvm_slb[slb_index].esid = 0;
|
||
|
|
return -ENOENT;
|
||
|
|
}
|
||
|
|
|
||
|
|
map = find_sid_vsid(vcpu, gvsid);
|
||
|
|
if (!map)
|
||
|
|
map = create_sid_map(vcpu, gvsid);
|
||
|
|
|
||
|
|
map->guest_esid = esid;
|
||
|
|
|
||
|
|
slb_vsid |= (map->host_vsid << 12);
|
||
|
|
slb_vsid &= ~SLB_VSID_KP;
|
||
|
|
slb_esid |= slb_index;
|
||
|
|
|
||
|
|
get_paca()->kvm_slb[slb_index].esid = slb_esid;
|
||
|
|
get_paca()->kvm_slb[slb_index].vsid = slb_vsid;
|
||
|
|
|
||
|
|
dprintk_slb("slbmte %#llx, %#llx\n", slb_vsid, slb_esid);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu)
|
||
|
|
{
|
||
|
|
get_paca()->kvm_slb_max = 1;
|
||
|
|
get_paca()->kvm_slb[0].esid = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)
|
||
|
|
{
|
||
|
|
kvmppc_mmu_pte_flush(vcpu, 0, 0);
|
||
|
|
}
|