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.
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.
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.
15 * Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
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>
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>
36 /* For now use fixed-size 16MB page table */
38 #define HPT_NPTEG (1ul << (HPT_ORDER - 7)) /* 128B per pteg */
39 #define HPT_HASH_MASK (HPT_NPTEG - 1)
41 /* Pages in the VRMA are 16MB pages */
42 #define VRMA_PAGE_ORDER 24
43 #define VRMA_VSID 0x1ffffffUL /* 1TB VSID reserved for VRMA */
45 /* POWER7 has 10-bit LPIDs, PPC970 has 6-bit LPIDs */
46 #define MAX_LPID_970 63
47 #define NR_LPIDS (LPID_RSVD + 1)
48 unsigned long lpid_inuse[BITS_TO_LONGS(NR_LPIDS)];
50 long kvmppc_alloc_hpt(struct kvm *kvm)
54 struct kvmppc_linear_info *li;
56 /* using preallocated memory */
59 hpt = (ulong)li->base_virt;
60 kvm->arch.hpt_li = li;
61 memset(li->base_virt, 0, li->npages << PAGE_SHIFT);
65 /* using dynamic memory */
66 hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_REPEAT|__GFP_NOWARN,
67 HPT_ORDER - PAGE_SHIFT);
70 pr_err("kvm_alloc_hpt: Couldn't alloc HPT\n");
73 kvm->arch.hpt_virt = hpt;
76 lpid = find_first_zero_bit(lpid_inuse, NR_LPIDS);
77 if (lpid >= NR_LPIDS) {
78 pr_err("kvm_alloc_hpt: No LPIDs free\n");
79 free_pages(hpt, HPT_ORDER - PAGE_SHIFT);
82 } while (test_and_set_bit(lpid, lpid_inuse));
84 kvm->arch.sdr1 = __pa(hpt) | (HPT_ORDER - 18);
85 kvm->arch.lpid = lpid;
87 pr_info("KVM guest htab at %lx, LPID %lx\n", hpt, lpid);
91 void kvmppc_free_hpt(struct kvm *kvm)
93 clear_bit(kvm->arch.lpid, lpid_inuse);
94 free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT);
96 kvm_release_hpt(kvm->arch.hpt_li);
98 free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT);
101 void kvmppc_map_vrma(struct kvm *kvm, struct kvm_userspace_memory_region *mem)
104 unsigned long npages = kvm->arch.ram_npages;
108 struct kvmppc_pginfo *pginfo = kvm->arch.ram_pginfo;
113 /* VRMA can't be > 1TB */
114 if (npages > 1ul << (40 - kvm->arch.ram_porder))
115 npages = 1ul << (40 - kvm->arch.ram_porder);
116 /* Can't use more than 1 HPTE per HPTEG */
117 if (npages > HPT_NPTEG)
120 for (i = 0; i < npages; ++i) {
124 /* can't use hpt_hash since va > 64 bits */
125 hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25))) & HPT_HASH_MASK;
127 * We assume that the hash table is empty and no
128 * vcpus are using it at this stage. Since we create
129 * at most one HPTE per HPTEG, we just assume entry 7
130 * is available and use it.
132 hpte = (unsigned long *) (kvm->arch.hpt_virt + (hash << 7));
134 /* HPTE low word - RPN, protection, etc. */
135 hpte[1] = (pfn << PAGE_SHIFT) | HPTE_R_R | HPTE_R_C |
138 hpte[0] = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) |
139 (i << (VRMA_PAGE_ORDER - 16)) | HPTE_V_BOLTED |
140 HPTE_V_LARGE | HPTE_V_VALID;
144 int kvmppc_mmu_hv_init(void)
146 unsigned long host_lpid, rsvd_lpid;
148 if (!cpu_has_feature(CPU_FTR_HVMODE))
151 memset(lpid_inuse, 0, sizeof(lpid_inuse));
153 if (cpu_has_feature(CPU_FTR_ARCH_206)) {
154 host_lpid = mfspr(SPRN_LPID); /* POWER7 */
155 rsvd_lpid = LPID_RSVD;
157 host_lpid = 0; /* PPC970 */
158 rsvd_lpid = MAX_LPID_970;
161 set_bit(host_lpid, lpid_inuse);
162 /* rsvd_lpid is reserved for use in partition switching */
163 set_bit(rsvd_lpid, lpid_inuse);
168 void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)
172 static void kvmppc_mmu_book3s_64_hv_reset_msr(struct kvm_vcpu *vcpu)
174 kvmppc_set_msr(vcpu, MSR_SF | MSR_ME);
177 static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
178 struct kvmppc_pte *gpte, bool data)
183 void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu)
185 struct kvmppc_mmu *mmu = &vcpu->arch.mmu;
187 if (cpu_has_feature(CPU_FTR_ARCH_206))
188 vcpu->arch.slb_nr = 32; /* POWER7 */
190 vcpu->arch.slb_nr = 64;
192 mmu->xlate = kvmppc_mmu_book3s_64_hv_xlate;
193 mmu->reset_msr = kvmppc_mmu_book3s_64_hv_reset_msr;
195 vcpu->arch.hflags |= BOOK3S_HFLAG_SLB;