1/*
  2 * This program is free software; you can redistribute it and/or modify
  3 * it under the terms of the GNU General Public License, version 2, as
  4 * published by the Free Software Foundation.
  5 *
  6 * This program is distributed in the hope that it will be useful,
  7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  9 * GNU General Public License for more details.
 10 *
 11 * You should have received a copy of the GNU General Public License
 12 * along with this program; if not, write to the Free Software
 13 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 14 *
 15 * Copyright IBM Corp. 2008
 16 *
 17 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
 18 */
 19
 20#include <linux/kvm_host.h>
 21#include <linux/slab.h>
 22#include <linux/err.h>
 23
 24#include <asm/reg.h>
 25#include <asm/cputable.h>
 26#include <asm/tlbflush.h>
 27#include <asm/kvm_44x.h>
 28#include <asm/kvm_ppc.h>
 29
 30#include "44x_tlb.h"
 31
 32void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 33{
 34	kvmppc_44x_tlb_load(vcpu);
 35}
 36
 37void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
 38{
 39	kvmppc_44x_tlb_put(vcpu);
 40}
 41
 42int kvmppc_core_check_processor_compat(void)
 43{
 44	int r;
 45
 46	if (strncmp(cur_cpu_spec->platform, "ppc440", 6) == 0)
 47		r = 0;
 48	else
 49		r = -ENOTSUPP;
 50
 51	return r;
 52}
 53
 54int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
 55{
 56	struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
 57	struct kvmppc_44x_tlbe *tlbe = &vcpu_44x->guest_tlb[0];
 58	int i;
 59
 60	tlbe->tid = 0;
 61	tlbe->word0 = PPC44x_TLB_16M | PPC44x_TLB_VALID;
 62	tlbe->word1 = 0;
 63	tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR;
 64
 65	tlbe++;
 66	tlbe->tid = 0;
 67	tlbe->word0 = 0xef600000 | PPC44x_TLB_4K | PPC44x_TLB_VALID;
 68	tlbe->word1 = 0xef600000;
 69	tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR
 70	              | PPC44x_TLB_I | PPC44x_TLB_G;
 71
 72	/* Since the guest can directly access the timebase, it must know the
 73	 * real timebase frequency. Accordingly, it must see the state of
 74	 * CCR1[TCS]. */
 75	/* XXX CCR1 doesn't exist on all 440 SoCs. */
 76	vcpu->arch.ccr1 = mfspr(SPRN_CCR1);
 77
 78	for (i = 0; i < ARRAY_SIZE(vcpu_44x->shadow_refs); i++)
 79		vcpu_44x->shadow_refs[i].gtlb_index = -1;
 80
 81	return 0;
 82}
 83
 84/* 'linear_address' is actually an encoding of AS|PID|EADDR . */
 85int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
 86                               struct kvm_translation *tr)
 87{
 88	int index;
 89	gva_t eaddr;
 90	u8 pid;
 91	u8 as;
 92
 93	eaddr = tr->linear_address;
 94	pid = (tr->linear_address >> 32) & 0xff;
 95	as = (tr->linear_address >> 40) & 0x1;
 96
 97	index = kvmppc_44x_tlb_index(vcpu, eaddr, pid, as);
 98	if (index == -1) {
 99		tr->valid = 0;
100		return 0;
101	}
102
103	tr->physical_address = kvmppc_mmu_xlate(vcpu, index, eaddr);
104	/* XXX what does "writeable" and "usermode" even mean? */
105	tr->valid = 1;
106
107	return 0;
108}
109
110void kvmppc_core_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
111{
112	kvmppc_get_sregs_ivor(vcpu, sregs);
113}
114
115int kvmppc_core_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
116{
117	return kvmppc_set_sregs_ivor(vcpu, sregs);
118}
119
120struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
121{
122	struct kvmppc_vcpu_44x *vcpu_44x;
123	struct kvm_vcpu *vcpu;
124	int err;
125
126	vcpu_44x = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
127	if (!vcpu_44x) {
128		err = -ENOMEM;
129		goto out;
130	}
131
132	vcpu = &vcpu_44x->vcpu;
133	err = kvm_vcpu_init(vcpu, kvm, id);
134	if (err)
135		goto free_vcpu;
136
137	vcpu->arch.shared = (void*)__get_free_page(GFP_KERNEL|__GFP_ZERO);
138	if (!vcpu->arch.shared)
139		goto uninit_vcpu;
140
141	return vcpu;
142
143uninit_vcpu:
144	kvm_vcpu_uninit(vcpu);
145free_vcpu:
146	kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
147out:
148	return ERR_PTR(err);
149}
150
151void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
152{
153	struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
154
155	free_page((unsigned long)vcpu->arch.shared);
156	kvm_vcpu_uninit(vcpu);
157	kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
158}
159
160static int __init kvmppc_44x_init(void)
161{
162	int r;
163
164	r = kvmppc_booke_init();
165	if (r)
166		return r;
167
168	return kvm_init(NULL, sizeof(struct kvmppc_vcpu_44x), 0, THIS_MODULE);
169}
170
171static void __exit kvmppc_44x_exit(void)
172{
173	kvmppc_booke_exit();
174}
175
176module_init(kvmppc_44x_init);
177module_exit(kvmppc_44x_exit);