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+/*
+ * 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>
+
+#define PTE_SIZE 12
+#define VSID_ALL 0
+
+// #define DEBUG_MMU
+// #define DEBUG_SLB
+
+void kvmppc_mmu_pte_flush(struct kvm_vcpu *vcpu, u64 guest_ea, u64 ea_mask)
+{
+ int i;
+
+#ifdef DEBUG_MMU
+ printk(KERN_INFO "KVM: Flushing %d Shadow PTEs: 0x%llx & 0x%llx\n",
+ vcpu->arch.hpte_cache_offset, guest_ea, ea_mask);
+#endif
+ BUG_ON(vcpu->arch.hpte_cache_offset > HPTEG_CACHE_NUM);
+ guest_ea &= ea_mask;
+ for (i=0; i<vcpu->arch.hpte_cache_offset; i++) {
+ struct hpte_cache *pte;
+
+ pte = &vcpu->arch.hpte_cache[i];
+ if (!pte->host_va)
+ continue;
+
+ if ((pte->pte.eaddr & ea_mask) == guest_ea) {
+#ifdef DEBUG_MMU
+ printk(KERN_INFO "KVM: Flushing SPT %d: 0x%llx (0x%llx) -> 0x%llx\n", i, pte->pte.eaddr, pte->pte.vpage, pte->host_va);
+#endif
+ ppc_md.hpte_invalidate(pte->slot, pte->host_va,
+ MMU_PAGE_4K, MMU_SEGSIZE_256M,
+ false);
+ pte->host_va = 0;
+ kvm_release_pfn_dirty(pte->pfn);
+ }
+ }
+
+ /* Doing a complete flush -> start from scratch */
+ if (!ea_mask)
+ vcpu->arch.hpte_cache_offset = 0;
+}
+
+void kvmppc_mmu_pte_vflush(struct kvm_vcpu *vcpu, u64 guest_vp, u64 vp_mask)
+{
+ int i;
+
+#ifdef DEBUG_MMU
+ printk(KERN_INFO "KVM: Flushing %d Shadow vPTEs: 0x%llx & 0x%llx\n",
+ vcpu->arch.hpte_cache_offset, guest_vp, vp_mask);
+#endif
+ BUG_ON(vcpu->arch.hpte_cache_offset > HPTEG_CACHE_NUM);
+ guest_vp &= vp_mask;
+ for (i=0; i<vcpu->arch.hpte_cache_offset; i++) {
+ struct hpte_cache *pte;
+
+ pte = &vcpu->arch.hpte_cache[i];
+ if (!pte->host_va)
+ continue;
+
+ if ((pte->pte.vpage & vp_mask) == guest_vp) {
+#ifdef DEBUG_MMU
+ printk(KERN_INFO "KVM: Flushing SPT %d: 0x%llx (0x%llx) -> 0x%llx\n", i, pte->pte.eaddr, pte->pte.vpage, pte->host_va);
+#endif
+ ppc_md.hpte_invalidate(pte->slot, pte->host_va,
+ MMU_PAGE_4K, MMU_SEGSIZE_256M,
+ false);
+ pte->host_va = 0;
+ kvm_release_pfn_dirty(pte->pfn);
+ }
+ }
+}
+
+void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, u64 pa_start, u64 pa_end)
+{
+ int i;
+
+#ifdef DEBUG_MMU
+ printk(KERN_INFO "KVM: Flushing %d Shadow pPTEs: 0x%llx & 0x%llx\n",
+ vcpu->arch.hpte_cache_offset, guest_pa, pa_mask);
+#endif
+ BUG_ON(vcpu->arch.hpte_cache_offset > HPTEG_CACHE_NUM);
+
+ for (i=0; i<vcpu->arch.hpte_cache_offset; i++) {
+ struct hpte_cache *pte;
+
+ pte = &vcpu->arch.hpte_cache[i];
+ if (!pte->host_va)
+ continue;
+
+ if ((pte->pte.raddr >= pa_start) && (pte->pte.raddr < pa_end)) {
+#ifdef DEBUG_MMU
+ printk(KERN_INFO "KVM: Flushing SPT %d: 0x%llx (0x%llx) -> 0x%llx\n", i, pte->pte.eaddr, pte->pte.raddr, pte->host_va);
+#endif
+ ppc_md.hpte_invalidate(pte->slot, pte->host_va,
+ MMU_PAGE_4K, MMU_SEGSIZE_256M,
+ false);
+ pte->host_va = 0;
+ kvm_release_pfn_dirty(pte->pfn);
+ }
+ }
+}
+
+struct kvmppc_pte *kvmppc_mmu_find_pte(struct kvm_vcpu *vcpu, u64 ea, bool data)
+{
+ int i;
+ u64 guest_vp;
+
+ guest_vp = vcpu->arch.mmu.ea_to_vp(vcpu, ea, false);
+ for (i=0; i<vcpu->arch.hpte_cache_offset; i++) {
+ struct hpte_cache *pte;
+
+ pte = &vcpu->arch.hpte_cache[i];
+ if (!pte->host_va)
+ continue;
+
+ if (pte->pte.vpage == guest_vp)
+ return &pte->pte;
+ }
+
+ return NULL;
+}
+
+static int kvmppc_mmu_hpte_cache_next(struct kvm_vcpu *vcpu)
+{
+ if (vcpu->arch.hpte_cache_offset == HPTEG_CACHE_NUM)
+ kvmppc_mmu_pte_flush(vcpu, 0, 0);
+
+ return vcpu->arch.hpte_cache_offset++;
+}
+
+/* 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;
+
+ if (vcpu->arch.msr & MSR_PR)
+ gvsid |= VSID_PR;
+
+ map = &to_book3s(vcpu)->sid_map[kvmppc_sid_hash(vcpu, gvsid)];
+ if (map->guest_vsid == gvsid) {
+#ifdef DEBUG_SLB
+ printk(KERN_INFO "SLB: Searching 0x%llx -> 0x%llx\n", gvsid, map->host_vsid);
+#endif
+ return map;
+ }
+
+ map = &to_book3s(vcpu)->sid_map[SID_MAP_MASK - kvmppc_sid_hash(vcpu, gvsid)];
+ if (map->guest_vsid == gvsid) {
+#ifdef DEBUG_SLB
+ printk(KERN_INFO "SLB: Searching 0x%llx -> 0x%llx\n", gvsid, map->host_vsid);
+#endif
+ return map;
+ }
+
+#ifdef DEBUG_SLB
+ printk(KERN_INFO "SLB: Searching 0x%llx -> not found\n", gvsid);
+#endif
+ 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 */
+ down_read(¤t->mm->mmap_sem);
+ hpaddr = gfn_to_pfn(vcpu->kvm, orig_pte->raddr >> PAGE_SHIFT);
+ if (kvm_is_error_hva(hpaddr)) {
+ printk(KERN_INFO "Couldn't get guest page for gfn %llx!\n", orig_pte->eaddr);
+ up_read(¤t->mm->mmap_sem);
+ return -EINVAL;
+ }
+ hpaddr <<= PAGE_SHIFT;
+#if PAGE_SHIFT == 12
+#elif PAGE_SHIFT == 16
+ hpaddr |= orig_pte->raddr & 0xf000;
+#else
+#error Unknown page size
+#endif
+
+ up_read(¤t->mm->mmap_sem);
+
+ /* 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) {
+ kvmppc_mmu_map_segment(vcpu, orig_pte->eaddr);
+ map = find_sid_vsid(vcpu, vsid);
+ }
+ BUG_ON(!map);
+
+ 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 */
+#ifdef USE_SECONDARY
+ hash = ~hash;
+ attempt++;
+ if (attempt % 2)
+ vflags = HPTE_V_SECONDARY;
+ else
+ vflags = 0;
+#else
+ attempt = 2;
+#endif
+ goto map_again;
+ } else {
+ int hpte_id = kvmppc_mmu_hpte_cache_next(vcpu);
+ struct hpte_cache *pte = &vcpu->arch.hpte_cache[hpte_id];
+#ifdef DEBUG_MMU
+ printk(KERN_INFO "KVM: %c%c Map 0x%llx: [%lx] 0x%lx (0x%llx) -> %lx\n",
+ ((rflags & HPTE_R_PP) == 3) ? '-' : 'w',
+ (rflags & HPTE_R_N) ? '-' : 'x',
+ orig_pte->eaddr, hpteg, va, orig_pte->vpage,
+ hpaddr);
+#endif
+ pte->slot = hpteg + (ret & 7);
+ pte->host_va = va;
+ pte->pte = *orig_pte;
+ pte->pfn = hpaddr >> PAGE_SHIFT;
+ }
+
+ 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);
+ static int backwards_map = 0;
+
+ if (vcpu->arch.msr & MSR_PR)
+ gvsid |= VSID_PR;
+
+ /* We might get collisions that trap in preceding order, so let's
+ map them differently */
+ if (backwards_map)
+ map = &to_book3s(vcpu)->sid_map[SID_MAP_MASK - kvmppc_sid_hash(vcpu, gvsid)];
+ else
+ map = &to_book3s(vcpu)->sid_map[kvmppc_sid_hash(vcpu, gvsid)];
+ 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;
+
+ 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 (!get_paca()->kvm_slb_max)
+ get_paca()->kvm_slb_max = 1;
+
+ /* Are we overwriting? */
+ for (i = 1; i < get_paca()->kvm_slb_max; i++) {
+ if (!(get_paca()->kvm_slb[i].esid & SLB_ESID_V))
+ found_inval = i;
+ else if ((get_paca()->kvm_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 ((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;
+
+#ifdef DEBUG_SLB
+ printk(KERN_INFO "slbmte %#llx, %#llx\n", slb_vsid, slb_esid);
+#endif
+
+ 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);
+}