Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 417 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 000000000..9a4614cd0
--- /dev/null
+++ b/arch/powerpc/kvm/book3s_64_mmu_host.c
@@ -0,0 +1,417 @@
+/*
+ * 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/book3s/64/mmu-hash.h>
+#include <asm/machdep.h>
+#include <asm/mmu_context.h>
+#include <asm/hw_irq.h>
+#include "trace_pr.h"
+#include "book3s.h"
+
+#define PTE_SIZE 12
+
+void kvmppc_mmu_invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
+{
+	mmu_hash_ops.hpte_invalidate(pte->slot, pte->host_vpn,
+				     pte->pagesize, pte->pagesize,
+				     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 (kvmppc_get_msr(vcpu) & 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,
+			bool iswrite)
+{
+	unsigned long vpn;
+	kvm_pfn_t hpaddr;
+	ulong hash, hpteg;
+	u64 vsid;
+	int ret;
+	int rflags = 0x192;
+	int vflags = 0;
+	int attempt = 0;
+	struct kvmppc_sid_map *map;
+	int r = 0;
+	int hpsize = MMU_PAGE_4K;
+	bool writable;
+	unsigned long mmu_seq;
+	struct kvm *kvm = vcpu->kvm;
+	struct hpte_cache *cpte;
+	unsigned long gfn = orig_pte->raddr >> PAGE_SHIFT;
+	unsigned long pfn;
+
+	/* used to check for invalidations in progress */
+	mmu_seq = kvm->mmu_notifier_seq;
+	smp_rmb();
+
+	/* Get host physical address for gpa */
+	pfn = kvmppc_gpa_to_pfn(vcpu, orig_pte->raddr, iswrite, &writable);
+	if (is_error_noslot_pfn(pfn)) {
+		printk(KERN_INFO "Couldn't get guest page for gpa %lx!\n",
+		       orig_pte->raddr);
+		r = -EINVAL;
+		goto out;
+	}
+	hpaddr = pfn << PAGE_SHIFT;
+
+	/* 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);
+		r = -EINVAL;
+		goto out;
+	}
+
+	vpn = hpt_vpn(orig_pte->eaddr, map->host_vsid, MMU_SEGSIZE_256M);
+
+	kvm_set_pfn_accessed(pfn);
+	if (!orig_pte->may_write || !writable)
+		rflags |= PP_RXRX;
+	else {
+		mark_page_dirty(vcpu->kvm, gfn);
+		kvm_set_pfn_dirty(pfn);
+	}
+
+	if (!orig_pte->may_execute)
+		rflags |= HPTE_R_N;
+	else
+		kvmppc_mmu_flush_icache(pfn);
+
+	rflags = (rflags & ~HPTE_R_WIMG) | orig_pte->wimg;
+
+	/*
+	 * Use 64K pages if possible; otherwise, on 64K page kernels,
+	 * we need to transfer 4 more bits from guest real to host real addr.
+	 */
+	if (vsid & VSID_64K)
+		hpsize = MMU_PAGE_64K;
+	else
+		hpaddr |= orig_pte->raddr & (~0xfffULL & ~PAGE_MASK);
+
+	hash = hpt_hash(vpn, mmu_psize_defs[hpsize].shift, MMU_SEGSIZE_256M);
+
+	cpte = kvmppc_mmu_hpte_cache_next(vcpu);
+
+	spin_lock(&kvm->mmu_lock);
+	if (!cpte || mmu_notifier_retry(kvm, mmu_seq)) {
+		r = -EAGAIN;
+		goto out_unlock;
+	}
+
+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 (mmu_hash_ops.hpte_remove(hpteg) < 0) {
+			r = -1;
+			goto out_unlock;
+		}
+
+	ret = mmu_hash_ops.hpte_insert(hpteg, vpn, hpaddr, rflags, vflags,
+				       hpsize, hpsize, MMU_SEGSIZE_256M);
+
+	if (ret == -1) {
+		/* If we couldn't map a primary PTE, try a secondary */
+		hash = ~hash;
+		vflags ^= HPTE_V_SECONDARY;
+		attempt++;
+		goto map_again;
+	} else if (ret < 0) {
+		r = -EIO;
+		goto out_unlock;
+	} else {
+		trace_kvm_book3s_64_mmu_map(rflags, hpteg,
+					    vpn, hpaddr, orig_pte);
+
+		/*
+		 * The mmu_hash_ops 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);
+		}
+
+		cpte->slot = hpteg + (ret & 7);
+		cpte->host_vpn = vpn;
+		cpte->pte = *orig_pte;
+		cpte->pfn = pfn;
+		cpte->pagesize = hpsize;
+
+		kvmppc_mmu_hpte_cache_map(vcpu, cpte);
+		cpte = NULL;
+	}
+
+out_unlock:
+	spin_unlock(&kvm->mmu_lock);
+	kvm_release_pfn_clean(pfn);
+	if (cpte)
+		kvmppc_mmu_hpte_cache_free(cpte);
+
+out:
+	return r;
+}
+
+void kvmppc_mmu_unmap_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
+{
+	u64 mask = 0xfffffffffULL;
+	u64 vsid;
+
+	vcpu->arch.mmu.esid_to_vsid(vcpu, pte->eaddr >> SID_SHIFT, &vsid);
+	if (vsid & VSID_64K)
+		mask = 0xffffffff0ULL;
+	kvmppc_mmu_pte_vflush(vcpu, pte->vpage, mask);
+}
+
+static struct kvmppc_sid_map *create_sid_map(struct kvm_vcpu *vcpu, u64 gvsid)
+{
+	unsigned long vsid_bits = VSID_BITS_65_256M;
+	struct kvmppc_sid_map *map;
+	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
+	u16 sid_map_mask;
+	static int backwards_map = 0;
+
+	if (kvmppc_get_msr(vcpu) & 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->proto_vsid_next == vcpu_book3s->proto_vsid_max) {
+		vcpu_book3s->proto_vsid_next = vcpu_book3s->proto_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);
+	}
+
+	if (mmu_has_feature(MMU_FTR_68_BIT_VA))
+		vsid_bits = VSID_BITS_256M;
+
+	map->host_vsid = vsid_scramble(vcpu_book3s->proto_vsid_next++,
+				       VSID_MULTIPLIER_256M, vsid_bits);
+
+	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)
+{
+	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
+	int i;
+	int max_slb_size = 64;
+	int found_inval = -1;
+	int r;
+
+	/* Are we overwriting? */
+	for (i = 0; i < svcpu->slb_max; i++) {
+		if (!(svcpu->slb[i].esid & SLB_ESID_V))
+			found_inval = i;
+		else if ((svcpu->slb[i].esid & ESID_MASK) == esid) {
+			r = i;
+			goto out;
+		}
+	}
+
+	/* Found a spare entry that was invalidated before */
+	if (found_inval >= 0) {
+		r = found_inval;
+		goto out;
+	}
+
+	/* No spare invalid entry, so create one */
+
+	if (mmu_slb_size < 64)
+		max_slb_size = mmu_slb_size;
+
+	/* Overflowing -> purge */
+	if ((svcpu->slb_max) == max_slb_size)
+		kvmppc_mmu_flush_segments(vcpu);
+
+	r = svcpu->slb_max;
+	svcpu->slb_max++;
+
+out:
+	svcpu_put(svcpu);
+	return r;
+}
+
+int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr)
+{
+	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
+	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;
+	int r = 0;
+
+	slb_index = kvmppc_mmu_next_segment(vcpu, eaddr & ESID_MASK);
+
+	if (vcpu->arch.mmu.esid_to_vsid(vcpu, esid, &gvsid)) {
+		/* Invalidate an entry */
+		svcpu->slb[slb_index].esid = 0;
+		r = -ENOENT;
+		goto out;
+	}
+
+	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;
+
+#ifdef CONFIG_PPC_64K_PAGES
+	/* Set host segment base page size to 64K if possible */
+	if (gvsid & VSID_64K)
+		slb_vsid |= mmu_psize_defs[MMU_PAGE_64K].sllp;
+#endif
+
+	svcpu->slb[slb_index].esid = slb_esid;
+	svcpu->slb[slb_index].vsid = slb_vsid;
+
+	trace_kvm_book3s_slbmte(slb_vsid, slb_esid);
+
+out:
+	svcpu_put(svcpu);
+	return r;
+}
+
+void kvmppc_mmu_flush_segment(struct kvm_vcpu *vcpu, ulong ea, ulong seg_size)
+{
+	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
+	ulong seg_mask = -seg_size;
+	int i;
+
+	for (i = 0; i < svcpu->slb_max; i++) {
+		if ((svcpu->slb[i].esid & SLB_ESID_V) &&
+		    (svcpu->slb[i].esid & seg_mask) == ea) {
+			/* Invalidate this entry */
+			svcpu->slb[i].esid = 0;
+		}
+	}
+
+	svcpu_put(svcpu);
+}
+
+void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu)
+{
+	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
+	svcpu->slb_max = 0;
+	svcpu->slb[0].esid = 0;
+	svcpu_put(svcpu);
+}
+
+void kvmppc_mmu_destroy_pr(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 = hash__alloc_context_id();
+	if (err < 0)
+		return -1;
+	vcpu3s->context_id[0] = err;
+
+	vcpu3s->proto_vsid_max = ((u64)(vcpu3s->context_id[0] + 1)
+				  << ESID_BITS) - 1;
+	vcpu3s->proto_vsid_first = (u64)vcpu3s->context_id[0] << ESID_BITS;
+	vcpu3s->proto_vsid_next = vcpu3s->proto_vsid_first;
+
+	kvmppc_mmu_hpte_init(vcpu);
+
+	return 0;
+}