diff options
Diffstat (limited to 'arch/powerpc/kvm/book3s_64_mmu_host.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_64_mmu_host.c | 309 |
1 files changed, 309 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_64_mmu_host.c b/arch/powerpc/kvm/book3s_64_mmu_host.c new file mode 100644 index 00000000..fa2f0843 --- /dev/null +++ b/arch/powerpc/kvm/book3s_64_mmu_host.c @@ -0,0 +1,309 @@ +/* + * Copyright (C) 2009 SUSE Linux Products GmbH. All rights reserved. + * + * Authors: + * Alexander Graf <agraf@suse.de> + * Kevin Wolf <mail@kevin-wolf.de> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +#include <linux/kvm_host.h> + +#include <asm/kvm_ppc.h> +#include <asm/kvm_book3s.h> +#include <asm/mmu-hash64.h> +#include <asm/machdep.h> +#include <asm/mmu_context.h> +#include <asm/hw_irq.h> +#include "trace.h" + +#define PTE_SIZE 12 + +void kvmppc_mmu_invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte) +{ + ppc_md.hpte_invalidate(pte->slot, pte->host_va, + MMU_PAGE_4K, MMU_SEGSIZE_256M, + false); +} + +/* We keep 512 gvsid->hvsid entries, mapping the guest ones to the array using + * a hash, so we don't waste cycles on looping */ +static u16 kvmppc_sid_hash(struct kvm_vcpu *vcpu, u64 gvsid) +{ + return (u16)(((gvsid >> (SID_MAP_BITS * 7)) & SID_MAP_MASK) ^ + ((gvsid >> (SID_MAP_BITS * 6)) & SID_MAP_MASK) ^ + ((gvsid >> (SID_MAP_BITS * 5)) & SID_MAP_MASK) ^ + ((gvsid >> (SID_MAP_BITS * 4)) & SID_MAP_MASK) ^ + ((gvsid >> (SID_MAP_BITS * 3)) & SID_MAP_MASK) ^ + ((gvsid >> (SID_MAP_BITS * 2)) & SID_MAP_MASK) ^ + ((gvsid >> (SID_MAP_BITS * 1)) & SID_MAP_MASK) ^ + ((gvsid >> (SID_MAP_BITS * 0)) & SID_MAP_MASK)); +} + + +static struct kvmppc_sid_map *find_sid_vsid(struct kvm_vcpu *vcpu, u64 gvsid) +{ + struct kvmppc_sid_map *map; + u16 sid_map_mask; + + if (vcpu->arch.shared->msr & MSR_PR) + gvsid |= VSID_PR; + + sid_map_mask = kvmppc_sid_hash(vcpu, gvsid); + map = &to_book3s(vcpu)->sid_map[sid_map_mask]; + if (map->valid && (map->guest_vsid == gvsid)) { + trace_kvm_book3s_slb_found(gvsid, map->host_vsid); + return map; + } + + map = &to_book3s(vcpu)->sid_map[SID_MAP_MASK - sid_map_mask]; + if (map->valid && (map->guest_vsid == gvsid)) { + trace_kvm_book3s_slb_found(gvsid, map->host_vsid); + return map; + } + + trace_kvm_book3s_slb_fail(sid_map_mask, gvsid); + return NULL; +} + +int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte) +{ + pfn_t hpaddr; + ulong hash, hpteg, va; + u64 vsid; + int ret; + int rflags = 0x192; + int vflags = 0; + int attempt = 0; + struct kvmppc_sid_map *map; + + /* Get host physical address for gpa */ + hpaddr = kvmppc_gfn_to_pfn(vcpu, orig_pte->raddr >> PAGE_SHIFT); + if (is_error_pfn(hpaddr)) { + printk(KERN_INFO "Couldn't get guest page for gfn %lx!\n", orig_pte->eaddr); + return -EINVAL; + } + hpaddr <<= PAGE_SHIFT; + hpaddr |= orig_pte->raddr & (~0xfffULL & ~PAGE_MASK); + + /* and write the mapping ea -> hpa into the pt */ + vcpu->arch.mmu.esid_to_vsid(vcpu, orig_pte->eaddr >> SID_SHIFT, &vsid); + map = find_sid_vsid(vcpu, vsid); + if (!map) { + ret = kvmppc_mmu_map_segment(vcpu, orig_pte->eaddr); + WARN_ON(ret < 0); + map = find_sid_vsid(vcpu, vsid); + } + if (!map) { + printk(KERN_ERR "KVM: Segment map for 0x%llx (0x%lx) failed\n", + vsid, orig_pte->eaddr); + WARN_ON(true); + return -EINVAL; + } + + vsid = map->host_vsid; + va = hpt_va(orig_pte->eaddr, vsid, MMU_SEGSIZE_256M); + + if (!orig_pte->may_write) + rflags |= HPTE_R_PP; + else + mark_page_dirty(vcpu->kvm, orig_pte->raddr >> PAGE_SHIFT); + + if (!orig_pte->may_execute) + rflags |= HPTE_R_N; + + hash = hpt_hash(va, PTE_SIZE, MMU_SEGSIZE_256M); + +map_again: + hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP); + + /* In case we tried normal mapping already, let's nuke old entries */ + if (attempt > 1) + if (ppc_md.hpte_remove(hpteg) < 0) + return -1; + + ret = ppc_md.hpte_insert(hpteg, va, hpaddr, rflags, vflags, MMU_PAGE_4K, MMU_SEGSIZE_256M); + + if (ret < 0) { + /* If we couldn't map a primary PTE, try a secondary */ + hash = ~hash; + vflags ^= HPTE_V_SECONDARY; + attempt++; + goto map_again; + } else { + struct hpte_cache *pte = kvmppc_mmu_hpte_cache_next(vcpu); + + trace_kvm_book3s_64_mmu_map(rflags, hpteg, va, hpaddr, orig_pte); + + /* The ppc_md code may give us a secondary entry even though we + asked for a primary. Fix up. */ + if ((ret & _PTEIDX_SECONDARY) && !(vflags & HPTE_V_SECONDARY)) { + hash = ~hash; + hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP); + } + + pte->slot = hpteg + (ret & 7); + pte->host_va = va; + pte->pte = *orig_pte; + pte->pfn = hpaddr >> PAGE_SHIFT; + + kvmppc_mmu_hpte_cache_map(vcpu, pte); + } + + return 0; +} + +static struct kvmppc_sid_map *create_sid_map(struct kvm_vcpu *vcpu, u64 gvsid) +{ + struct kvmppc_sid_map *map; + struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); + u16 sid_map_mask; + static int backwards_map = 0; + + if (vcpu->arch.shared->msr & MSR_PR) + gvsid |= VSID_PR; + + /* We might get collisions that trap in preceding order, so let's + map them differently */ + + sid_map_mask = kvmppc_sid_hash(vcpu, gvsid); + if (backwards_map) + sid_map_mask = SID_MAP_MASK - sid_map_mask; + + map = &to_book3s(vcpu)->sid_map[sid_map_mask]; + + /* Make sure we're taking the other map next time */ + backwards_map = !backwards_map; + + /* Uh-oh ... out of mappings. Let's flush! */ + if (vcpu_book3s->vsid_next == vcpu_book3s->vsid_max) { + vcpu_book3s->vsid_next = vcpu_book3s->vsid_first; + memset(vcpu_book3s->sid_map, 0, + sizeof(struct kvmppc_sid_map) * SID_MAP_NUM); + kvmppc_mmu_pte_flush(vcpu, 0, 0); + kvmppc_mmu_flush_segments(vcpu); + } + map->host_vsid = vcpu_book3s->vsid_next++; + + map->guest_vsid = gvsid; + map->valid = true; + + trace_kvm_book3s_slb_map(sid_map_mask, gvsid, map->host_vsid); + + return map; +} + +static int kvmppc_mmu_next_segment(struct kvm_vcpu *vcpu, ulong esid) +{ + int i; + int max_slb_size = 64; + int found_inval = -1; + int r; + + if (!to_svcpu(vcpu)->slb_max) + to_svcpu(vcpu)->slb_max = 1; + + /* Are we overwriting? */ + for (i = 1; i < to_svcpu(vcpu)->slb_max; i++) { + if (!(to_svcpu(vcpu)->slb[i].esid & SLB_ESID_V)) + found_inval = i; + else if ((to_svcpu(vcpu)->slb[i].esid & ESID_MASK) == esid) + return i; + } + + /* Found a spare entry that was invalidated before */ + 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 ((to_svcpu(vcpu)->slb_max) == max_slb_size) + kvmppc_mmu_flush_segments(vcpu); + + r = to_svcpu(vcpu)->slb_max; + to_svcpu(vcpu)->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 */ + to_svcpu(vcpu)->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; + + to_svcpu(vcpu)->slb[slb_index].esid = slb_esid; + to_svcpu(vcpu)->slb[slb_index].vsid = slb_vsid; + + trace_kvm_book3s_slbmte(slb_vsid, slb_esid); + + return 0; +} + +void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu) +{ + to_svcpu(vcpu)->slb_max = 1; + to_svcpu(vcpu)->slb[0].esid = 0; +} + +void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu) +{ + kvmppc_mmu_hpte_destroy(vcpu); + __destroy_context(to_book3s(vcpu)->context_id[0]); +} + +int kvmppc_mmu_init(struct kvm_vcpu *vcpu) +{ + struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu); + int err; + + err = __init_new_context(); + if (err < 0) + return -1; + vcpu3s->context_id[0] = err; + + vcpu3s->vsid_max = ((vcpu3s->context_id[0] + 1) << USER_ESID_BITS) - 1; + vcpu3s->vsid_first = vcpu3s->context_id[0] << USER_ESID_BITS; + vcpu3s->vsid_next = vcpu3s->vsid_first; + + kvmppc_mmu_hpte_init(vcpu); + + return 0; +} |