2 * Copyright (C) 2009 SUSE Linux Products GmbH. All rights reserved.
5 * Alexander Graf <agraf@suse.de>
6 * Kevin Wolf <mail@kevin-wolf.de>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License, version 2, as
10 * published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
22 #include <linux/kvm_host.h>
24 #include <asm/kvm_ppc.h>
25 #include <asm/kvm_book3s.h>
26 #include <asm/mmu-hash64.h>
27 #include <asm/machdep.h>
28 #include <asm/mmu_context.h>
29 #include <asm/hw_irq.h>
34 void kvmppc_mmu_invalidate_pte(struct kvm_vcpu
*vcpu
, struct hpte_cache
*pte
)
36 ppc_md
.hpte_invalidate(pte
->slot
, pte
->host_vpn
,
37 MMU_PAGE_4K
, MMU_SEGSIZE_256M
,
41 /* We keep 512 gvsid->hvsid entries, mapping the guest ones to the array using
42 * a hash, so we don't waste cycles on looping */
43 static u16
kvmppc_sid_hash(struct kvm_vcpu
*vcpu
, u64 gvsid
)
45 return (u16
)(((gvsid
>> (SID_MAP_BITS
* 7)) & SID_MAP_MASK
) ^
46 ((gvsid
>> (SID_MAP_BITS
* 6)) & SID_MAP_MASK
) ^
47 ((gvsid
>> (SID_MAP_BITS
* 5)) & SID_MAP_MASK
) ^
48 ((gvsid
>> (SID_MAP_BITS
* 4)) & SID_MAP_MASK
) ^
49 ((gvsid
>> (SID_MAP_BITS
* 3)) & SID_MAP_MASK
) ^
50 ((gvsid
>> (SID_MAP_BITS
* 2)) & SID_MAP_MASK
) ^
51 ((gvsid
>> (SID_MAP_BITS
* 1)) & SID_MAP_MASK
) ^
52 ((gvsid
>> (SID_MAP_BITS
* 0)) & SID_MAP_MASK
));
56 static struct kvmppc_sid_map
*find_sid_vsid(struct kvm_vcpu
*vcpu
, u64 gvsid
)
58 struct kvmppc_sid_map
*map
;
61 if (vcpu
->arch
.shared
->msr
& MSR_PR
)
64 sid_map_mask
= kvmppc_sid_hash(vcpu
, gvsid
);
65 map
= &to_book3s(vcpu
)->sid_map
[sid_map_mask
];
66 if (map
->valid
&& (map
->guest_vsid
== gvsid
)) {
67 trace_kvm_book3s_slb_found(gvsid
, map
->host_vsid
);
71 map
= &to_book3s(vcpu
)->sid_map
[SID_MAP_MASK
- sid_map_mask
];
72 if (map
->valid
&& (map
->guest_vsid
== gvsid
)) {
73 trace_kvm_book3s_slb_found(gvsid
, map
->host_vsid
);
77 trace_kvm_book3s_slb_fail(sid_map_mask
, gvsid
);
81 int kvmppc_mmu_map_page(struct kvm_vcpu
*vcpu
, struct kvmppc_pte
*orig_pte
)
91 struct kvmppc_sid_map
*map
;
94 /* Get host physical address for gpa */
95 hpaddr
= kvmppc_gfn_to_pfn(vcpu
, orig_pte
->raddr
>> PAGE_SHIFT
);
96 if (is_error_noslot_pfn(hpaddr
)) {
97 printk(KERN_INFO
"Couldn't get guest page for gfn %lx!\n", orig_pte
->eaddr
);
101 hpaddr
<<= PAGE_SHIFT
;
102 hpaddr
|= orig_pte
->raddr
& (~0xfffULL
& ~PAGE_MASK
);
104 /* and write the mapping ea -> hpa into the pt */
105 vcpu
->arch
.mmu
.esid_to_vsid(vcpu
, orig_pte
->eaddr
>> SID_SHIFT
, &vsid
);
106 map
= find_sid_vsid(vcpu
, vsid
);
108 ret
= kvmppc_mmu_map_segment(vcpu
, orig_pte
->eaddr
);
110 map
= find_sid_vsid(vcpu
, vsid
);
113 printk(KERN_ERR
"KVM: Segment map for 0x%llx (0x%lx) failed\n",
114 vsid
, orig_pte
->eaddr
);
120 vsid
= map
->host_vsid
;
121 vpn
= hpt_vpn(orig_pte
->eaddr
, vsid
, MMU_SEGSIZE_256M
);
123 if (!orig_pte
->may_write
)
126 mark_page_dirty(vcpu
->kvm
, orig_pte
->raddr
>> PAGE_SHIFT
);
128 if (!orig_pte
->may_execute
)
131 kvmppc_mmu_flush_icache(hpaddr
>> PAGE_SHIFT
);
133 hash
= hpt_hash(vpn
, PTE_SIZE
, MMU_SEGSIZE_256M
);
136 hpteg
= ((hash
& htab_hash_mask
) * HPTES_PER_GROUP
);
138 /* In case we tried normal mapping already, let's nuke old entries */
140 if (ppc_md
.hpte_remove(hpteg
) < 0) {
145 ret
= ppc_md
.hpte_insert(hpteg
, vpn
, hpaddr
, rflags
, vflags
,
146 MMU_PAGE_4K
, MMU_SEGSIZE_256M
);
149 /* If we couldn't map a primary PTE, try a secondary */
151 vflags
^= HPTE_V_SECONDARY
;
155 struct hpte_cache
*pte
= kvmppc_mmu_hpte_cache_next(vcpu
);
157 trace_kvm_book3s_64_mmu_map(rflags
, hpteg
,
158 vpn
, hpaddr
, orig_pte
);
160 /* The ppc_md code may give us a secondary entry even though we
161 asked for a primary. Fix up. */
162 if ((ret
& _PTEIDX_SECONDARY
) && !(vflags
& HPTE_V_SECONDARY
)) {
164 hpteg
= ((hash
& htab_hash_mask
) * HPTES_PER_GROUP
);
167 pte
->slot
= hpteg
+ (ret
& 7);
169 pte
->pte
= *orig_pte
;
170 pte
->pfn
= hpaddr
>> PAGE_SHIFT
;
172 kvmppc_mmu_hpte_cache_map(vcpu
, pte
);
174 kvm_release_pfn_clean(hpaddr
>> PAGE_SHIFT
);
180 static struct kvmppc_sid_map
*create_sid_map(struct kvm_vcpu
*vcpu
, u64 gvsid
)
182 struct kvmppc_sid_map
*map
;
183 struct kvmppc_vcpu_book3s
*vcpu_book3s
= to_book3s(vcpu
);
185 static int backwards_map
= 0;
187 if (vcpu
->arch
.shared
->msr
& MSR_PR
)
190 /* We might get collisions that trap in preceding order, so let's
191 map them differently */
193 sid_map_mask
= kvmppc_sid_hash(vcpu
, gvsid
);
195 sid_map_mask
= SID_MAP_MASK
- sid_map_mask
;
197 map
= &to_book3s(vcpu
)->sid_map
[sid_map_mask
];
199 /* Make sure we're taking the other map next time */
200 backwards_map
= !backwards_map
;
202 /* Uh-oh ... out of mappings. Let's flush! */
203 if (vcpu_book3s
->proto_vsid_next
== vcpu_book3s
->proto_vsid_max
) {
204 vcpu_book3s
->proto_vsid_next
= vcpu_book3s
->proto_vsid_first
;
205 memset(vcpu_book3s
->sid_map
, 0,
206 sizeof(struct kvmppc_sid_map
) * SID_MAP_NUM
);
207 kvmppc_mmu_pte_flush(vcpu
, 0, 0);
208 kvmppc_mmu_flush_segments(vcpu
);
210 map
->host_vsid
= vsid_scramble(vcpu_book3s
->proto_vsid_next
++, 256M
);
212 map
->guest_vsid
= gvsid
;
215 trace_kvm_book3s_slb_map(sid_map_mask
, gvsid
, map
->host_vsid
);
220 static int kvmppc_mmu_next_segment(struct kvm_vcpu
*vcpu
, ulong esid
)
222 struct kvmppc_book3s_shadow_vcpu
*svcpu
= svcpu_get(vcpu
);
224 int max_slb_size
= 64;
225 int found_inval
= -1;
231 /* Are we overwriting? */
232 for (i
= 1; i
< svcpu
->slb_max
; i
++) {
233 if (!(svcpu
->slb
[i
].esid
& SLB_ESID_V
))
235 else if ((svcpu
->slb
[i
].esid
& ESID_MASK
) == esid
) {
241 /* Found a spare entry that was invalidated before */
242 if (found_inval
> 0) {
247 /* No spare invalid entry, so create one */
249 if (mmu_slb_size
< 64)
250 max_slb_size
= mmu_slb_size
;
252 /* Overflowing -> purge */
253 if ((svcpu
->slb_max
) == max_slb_size
)
254 kvmppc_mmu_flush_segments(vcpu
);
264 int kvmppc_mmu_map_segment(struct kvm_vcpu
*vcpu
, ulong eaddr
)
266 struct kvmppc_book3s_shadow_vcpu
*svcpu
= svcpu_get(vcpu
);
267 u64 esid
= eaddr
>> SID_SHIFT
;
268 u64 slb_esid
= (eaddr
& ESID_MASK
) | SLB_ESID_V
;
269 u64 slb_vsid
= SLB_VSID_USER
;
272 struct kvmppc_sid_map
*map
;
275 slb_index
= kvmppc_mmu_next_segment(vcpu
, eaddr
& ESID_MASK
);
277 if (vcpu
->arch
.mmu
.esid_to_vsid(vcpu
, esid
, &gvsid
)) {
278 /* Invalidate an entry */
279 svcpu
->slb
[slb_index
].esid
= 0;
284 map
= find_sid_vsid(vcpu
, gvsid
);
286 map
= create_sid_map(vcpu
, gvsid
);
288 map
->guest_esid
= esid
;
290 slb_vsid
|= (map
->host_vsid
<< 12);
291 slb_vsid
&= ~SLB_VSID_KP
;
292 slb_esid
|= slb_index
;
294 svcpu
->slb
[slb_index
].esid
= slb_esid
;
295 svcpu
->slb
[slb_index
].vsid
= slb_vsid
;
297 trace_kvm_book3s_slbmte(slb_vsid
, slb_esid
);
304 void kvmppc_mmu_flush_segments(struct kvm_vcpu
*vcpu
)
306 struct kvmppc_book3s_shadow_vcpu
*svcpu
= svcpu_get(vcpu
);
308 svcpu
->slb
[0].esid
= 0;
312 void kvmppc_mmu_destroy(struct kvm_vcpu
*vcpu
)
314 kvmppc_mmu_hpte_destroy(vcpu
);
315 __destroy_context(to_book3s(vcpu
)->context_id
[0]);
318 int kvmppc_mmu_init(struct kvm_vcpu
*vcpu
)
320 struct kvmppc_vcpu_book3s
*vcpu3s
= to_book3s(vcpu
);
323 err
= __init_new_context();
326 vcpu3s
->context_id
[0] = err
;
328 vcpu3s
->proto_vsid_max
= ((vcpu3s
->context_id
[0] + 1)
329 << USER_ESID_BITS
) - 1;
330 vcpu3s
->proto_vsid_first
= vcpu3s
->context_id
[0] << USER_ESID_BITS
;
331 vcpu3s
->proto_vsid_next
= vcpu3s
->proto_vsid_first
;
333 kvmppc_mmu_hpte_init(vcpu
);