Paul Mackerras | de56a94 | 2011-06-29 00:21:34 +0000 | [diff] [blame] | 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 | |
Paul Mackerras | 9e368f2 | 2011-06-29 00:40:08 +0000 | [diff] [blame] | 45 | /* POWER7 has 10-bit LPIDs, PPC970 has 6-bit LPIDs */ |
| 46 | #define MAX_LPID_970 63 |
Paul Mackerras | de56a94 | 2011-06-29 00:21:34 +0000 | [diff] [blame] | 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; |
Paul Mackerras | de56a94 | 2011-06-29 00:21:34 +0000 | [diff] [blame] | 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 | { |
Paul Mackerras | de56a94 | 2011-06-29 00:21:34 +0000 | [diff] [blame] | 81 | clear_bit(kvm->arch.lpid, lpid_inuse); |
| 82 | free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT); |
Paul Mackerras | de56a94 | 2011-06-29 00:21:34 +0000 | [diff] [blame] | 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; |
Paul Mackerras | aa04b4c | 2011-06-29 00:25:44 +0000 | [diff] [blame] | 106 | if (!pfn) |
| 107 | break; |
Paul Mackerras | de56a94 | 2011-06-29 00:21:34 +0000 | [diff] [blame] | 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 | { |
Paul Mackerras | 9e368f2 | 2011-06-29 00:40:08 +0000 | [diff] [blame] | 130 | unsigned long host_lpid, rsvd_lpid; |
| 131 | |
| 132 | if (!cpu_has_feature(CPU_FTR_HVMODE)) |
Paul Mackerras | de56a94 | 2011-06-29 00:21:34 +0000 | [diff] [blame] | 133 | return -EINVAL; |
Paul Mackerras | 9e368f2 | 2011-06-29 00:40:08 +0000 | [diff] [blame] | 134 | |
Paul Mackerras | de56a94 | 2011-06-29 00:21:34 +0000 | [diff] [blame] | 135 | memset(lpid_inuse, 0, sizeof(lpid_inuse)); |
Paul Mackerras | 9e368f2 | 2011-06-29 00:40:08 +0000 | [diff] [blame] | 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); |
Paul Mackerras | de56a94 | 2011-06-29 00:21:34 +0000 | [diff] [blame] | 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 | |
Paul Mackerras | 9e368f2 | 2011-06-29 00:40:08 +0000 | [diff] [blame] | 171 | if (cpu_has_feature(CPU_FTR_ARCH_206)) |
| 172 | vcpu->arch.slb_nr = 32; /* POWER7 */ |
| 173 | else |
| 174 | vcpu->arch.slb_nr = 64; |
Paul Mackerras | de56a94 | 2011-06-29 00:21:34 +0000 | [diff] [blame] | 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 | } |