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de56a948 PM |
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 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> | |
16 | */ | |
17 | ||
18 | #include <linux/types.h> | |
19 | #include <linux/string.h> | |
20 | #include <linux/kvm.h> | |
21 | #include <linux/kvm_host.h> | |
22 | #include <linux/highmem.h> | |
23 | #include <linux/gfp.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/hugetlb.h> | |
26 | ||
27 | #include <asm/tlbflush.h> | |
28 | #include <asm/kvm_ppc.h> | |
29 | #include <asm/kvm_book3s.h> | |
30 | #include <asm/mmu-hash64.h> | |
31 | #include <asm/hvcall.h> | |
32 | #include <asm/synch.h> | |
33 | #include <asm/ppc-opcode.h> | |
34 | #include <asm/cputable.h> | |
35 | ||
36 | /* For now use fixed-size 16MB page table */ | |
37 | #define HPT_ORDER 24 | |
38 | #define HPT_NPTEG (1ul << (HPT_ORDER - 7)) /* 128B per pteg */ | |
39 | #define HPT_HASH_MASK (HPT_NPTEG - 1) | |
40 | ||
41 | /* Pages in the VRMA are 16MB pages */ | |
42 | #define VRMA_PAGE_ORDER 24 | |
43 | #define VRMA_VSID 0x1ffffffUL /* 1TB VSID reserved for VRMA */ | |
44 | ||
9e368f29 PM |
45 | /* POWER7 has 10-bit LPIDs, PPC970 has 6-bit LPIDs */ |
46 | #define MAX_LPID_970 63 | |
de56a948 PM |
47 | #define NR_LPIDS (LPID_RSVD + 1) |
48 | unsigned long lpid_inuse[BITS_TO_LONGS(NR_LPIDS)]; | |
49 | ||
50 | long kvmppc_alloc_hpt(struct kvm *kvm) | |
51 | { | |
52 | unsigned long hpt; | |
53 | unsigned long lpid; | |
54 | ||
55 | hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_REPEAT|__GFP_NOWARN, | |
56 | HPT_ORDER - PAGE_SHIFT); | |
57 | if (!hpt) { | |
58 | pr_err("kvm_alloc_hpt: Couldn't alloc HPT\n"); | |
59 | return -ENOMEM; | |
60 | } | |
61 | kvm->arch.hpt_virt = hpt; | |
62 | ||
63 | do { | |
64 | lpid = find_first_zero_bit(lpid_inuse, NR_LPIDS); | |
65 | if (lpid >= NR_LPIDS) { | |
66 | pr_err("kvm_alloc_hpt: No LPIDs free\n"); | |
67 | free_pages(hpt, HPT_ORDER - PAGE_SHIFT); | |
68 | return -ENOMEM; | |
69 | } | |
70 | } while (test_and_set_bit(lpid, lpid_inuse)); | |
71 | ||
72 | kvm->arch.sdr1 = __pa(hpt) | (HPT_ORDER - 18); | |
73 | kvm->arch.lpid = lpid; | |
de56a948 PM |
74 | |
75 | pr_info("KVM guest htab at %lx, LPID %lx\n", hpt, lpid); | |
76 | return 0; | |
77 | } | |
78 | ||
79 | void kvmppc_free_hpt(struct kvm *kvm) | |
80 | { | |
de56a948 PM |
81 | clear_bit(kvm->arch.lpid, lpid_inuse); |
82 | free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT); | |
de56a948 PM |
83 | } |
84 | ||
85 | void kvmppc_map_vrma(struct kvm *kvm, struct kvm_userspace_memory_region *mem) | |
86 | { | |
87 | unsigned long i; | |
88 | unsigned long npages = kvm->arch.ram_npages; | |
89 | unsigned long pfn; | |
90 | unsigned long *hpte; | |
91 | unsigned long hash; | |
92 | struct kvmppc_pginfo *pginfo = kvm->arch.ram_pginfo; | |
93 | ||
94 | if (!pginfo) | |
95 | return; | |
96 | ||
97 | /* VRMA can't be > 1TB */ | |
98 | if (npages > 1ul << (40 - kvm->arch.ram_porder)) | |
99 | npages = 1ul << (40 - kvm->arch.ram_porder); | |
100 | /* Can't use more than 1 HPTE per HPTEG */ | |
101 | if (npages > HPT_NPTEG) | |
102 | npages = HPT_NPTEG; | |
103 | ||
104 | for (i = 0; i < npages; ++i) { | |
105 | pfn = pginfo[i].pfn; | |
aa04b4cc PM |
106 | if (!pfn) |
107 | break; | |
de56a948 PM |
108 | /* can't use hpt_hash since va > 64 bits */ |
109 | hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25))) & HPT_HASH_MASK; | |
110 | /* | |
111 | * We assume that the hash table is empty and no | |
112 | * vcpus are using it at this stage. Since we create | |
113 | * at most one HPTE per HPTEG, we just assume entry 7 | |
114 | * is available and use it. | |
115 | */ | |
116 | hpte = (unsigned long *) (kvm->arch.hpt_virt + (hash << 7)); | |
117 | hpte += 7 * 2; | |
118 | /* HPTE low word - RPN, protection, etc. */ | |
119 | hpte[1] = (pfn << PAGE_SHIFT) | HPTE_R_R | HPTE_R_C | | |
120 | HPTE_R_M | PP_RWXX; | |
121 | wmb(); | |
122 | hpte[0] = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) | | |
123 | (i << (VRMA_PAGE_ORDER - 16)) | HPTE_V_BOLTED | | |
124 | HPTE_V_LARGE | HPTE_V_VALID; | |
125 | } | |
126 | } | |
127 | ||
128 | int kvmppc_mmu_hv_init(void) | |
129 | { | |
9e368f29 PM |
130 | unsigned long host_lpid, rsvd_lpid; |
131 | ||
132 | if (!cpu_has_feature(CPU_FTR_HVMODE)) | |
de56a948 | 133 | return -EINVAL; |
9e368f29 | 134 | |
de56a948 | 135 | memset(lpid_inuse, 0, sizeof(lpid_inuse)); |
9e368f29 PM |
136 | |
137 | if (cpu_has_feature(CPU_FTR_ARCH_206)) { | |
138 | host_lpid = mfspr(SPRN_LPID); /* POWER7 */ | |
139 | rsvd_lpid = LPID_RSVD; | |
140 | } else { | |
141 | host_lpid = 0; /* PPC970 */ | |
142 | rsvd_lpid = MAX_LPID_970; | |
143 | } | |
144 | ||
145 | set_bit(host_lpid, lpid_inuse); | |
146 | /* rsvd_lpid is reserved for use in partition switching */ | |
147 | set_bit(rsvd_lpid, lpid_inuse); | |
de56a948 PM |
148 | |
149 | return 0; | |
150 | } | |
151 | ||
152 | void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu) | |
153 | { | |
154 | } | |
155 | ||
156 | static void kvmppc_mmu_book3s_64_hv_reset_msr(struct kvm_vcpu *vcpu) | |
157 | { | |
158 | kvmppc_set_msr(vcpu, MSR_SF | MSR_ME); | |
159 | } | |
160 | ||
161 | static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, | |
162 | struct kvmppc_pte *gpte, bool data) | |
163 | { | |
164 | return -ENOENT; | |
165 | } | |
166 | ||
167 | void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu) | |
168 | { | |
169 | struct kvmppc_mmu *mmu = &vcpu->arch.mmu; | |
170 | ||
9e368f29 PM |
171 | if (cpu_has_feature(CPU_FTR_ARCH_206)) |
172 | vcpu->arch.slb_nr = 32; /* POWER7 */ | |
173 | else | |
174 | vcpu->arch.slb_nr = 64; | |
de56a948 PM |
175 | |
176 | mmu->xlate = kvmppc_mmu_book3s_64_hv_xlate; | |
177 | mmu->reset_msr = kvmppc_mmu_book3s_64_hv_reset_msr; | |
178 | ||
179 | vcpu->arch.hflags |= BOOK3S_HFLAG_SLB; | |
180 | } |