arch/powerpc/kvm/book3s_64_mmu_hv.c

   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 #include <linux/vmalloc.h>
  27
  28 #include <asm/tlbflush.h>
  29 #include <asm/kvm_ppc.h>
  30 #include <asm/kvm_book3s.h>
  31 #include <asm/mmu-hash64.h>
  32 #include <asm/hvcall.h>
  33 #include <asm/synch.h>
  34 #include <asm/ppc-opcode.h>
  35 #include <asm/cputable.h>
  36
  37 /* Pages in the VRMA are 16MB pages */
  38 #define VRMA_PAGE_ORDER 24
  39 #define VRMA_VSID       0x1ffffffUL     /* 1TB VSID reserved for VRMA */
  40
  41 /* POWER7 has 10-bit LPIDs, PPC970 has 6-bit LPIDs */
  42 #define MAX_LPID_970    63
  43 #define NR_LPIDS        (LPID_RSVD + 1)
  44 unsigned long lpid_inuse[BITS_TO_LONGS(NR_LPIDS)];
  45
  46 long kvmppc_alloc_hpt(struct kvm *kvm)
  47 {
  48         unsigned long hpt;
  49         unsigned long lpid;
  50         struct revmap_entry *rev;
  51
  52         /* Allocate guest's hashed page table */
  53         hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_REPEAT|__GFP_NOWARN,
  54                                HPT_ORDER - PAGE_SHIFT);
  55         if (!hpt) {
  56                 pr_err("kvm_alloc_hpt: Couldn't alloc HPT\n");
  57                 return -ENOMEM;
  58         }
  59         kvm->arch.hpt_virt = hpt;
  60
  61         /* Allocate reverse map array */
  62         rev = vmalloc(sizeof(struct revmap_entry) * HPT_NPTE);
  63         if (!rev) {
  64                 pr_err("kvmppc_alloc_hpt: Couldn't alloc reverse map array\n");
  65                 goto out_freehpt;
  66         }
  67         kvm->arch.revmap = rev;
  68
  69         /* Allocate the guest's logical partition ID */
  70         do {
  71                 lpid = find_first_zero_bit(lpid_inuse, NR_LPIDS);
  72                 if (lpid >= NR_LPIDS) {
  73                         pr_err("kvm_alloc_hpt: No LPIDs free\n");
  74                         goto out_freeboth;
  75                 }
  76         } while (test_and_set_bit(lpid, lpid_inuse));
  77
  78         kvm->arch.sdr1 = __pa(hpt) | (HPT_ORDER - 18);
  79         kvm->arch.lpid = lpid;
  80
  81         pr_info("KVM guest htab at %lx, LPID %lx\n", hpt, lpid);
  82         return 0;
  83
  84  out_freeboth:
  85         vfree(rev);
  86  out_freehpt:
  87         free_pages(hpt, HPT_ORDER - PAGE_SHIFT);
  88         return -ENOMEM;
  89 }
  90
  91 void kvmppc_free_hpt(struct kvm *kvm)
  92 {
  93         clear_bit(kvm->arch.lpid, lpid_inuse);
  94         vfree(kvm->arch.revmap);
  95         free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT);
  96 }
  97
  98 void kvmppc_map_vrma(struct kvm *kvm, struct kvm_userspace_memory_region *mem)
  99 {
 100         unsigned long i;
 101         unsigned long npages;
 102         unsigned long pa;
 103         unsigned long *hpte;
 104         unsigned long hash;
 105         unsigned long porder = kvm->arch.ram_porder;
 106         struct revmap_entry *rev;
 107         unsigned long *physp;
 108
 109         physp = kvm->arch.slot_phys[mem->slot];
 110         npages = kvm->arch.slot_npages[mem->slot];
 111
 112         /* VRMA can't be > 1TB */
 113         if (npages > 1ul << (40 - porder))
 114                 npages = 1ul << (40 - porder);
 115         /* Can't use more than 1 HPTE per HPTEG */
 116         if (npages > HPT_NPTEG)
 117                 npages = HPT_NPTEG;
 118
 119         for (i = 0; i < npages; ++i) {
 120                 pa = physp[i];
 121                 if (!pa)
 122                         break;
 123                 pa &= PAGE_MASK;
 124                 /* can't use hpt_hash since va > 64 bits */
 125                 hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25))) & HPT_HASH_MASK;
 126                 /*
 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.
 131                  */
 132                 hash = (hash << 3) + 7;
 133                 hpte = (unsigned long *) (kvm->arch.hpt_virt + (hash << 4));
 134                 /* HPTE low word - RPN, protection, etc. */
 135                 hpte[1] = pa | HPTE_R_R | HPTE_R_C | HPTE_R_M | PP_RWXX;
 136                 smp_wmb();
 137                 hpte[0] = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) |
 138                         (i << (VRMA_PAGE_ORDER - 16)) | HPTE_V_BOLTED |
 139                         HPTE_V_LARGE | HPTE_V_VALID;
 140
 141                 /* Reverse map info */
 142                 rev = &kvm->arch.revmap[hash];
 143                 rev->guest_rpte = (i << porder) | HPTE_R_R | HPTE_R_C |
 144                         HPTE_R_M | PP_RWXX;
 145         }
 146 }
 147
 148 int kvmppc_mmu_hv_init(void)
 149 {
 150         unsigned long host_lpid, rsvd_lpid;
 151
 152         if (!cpu_has_feature(CPU_FTR_HVMODE))
 153                 return -EINVAL;
 154
 155         memset(lpid_inuse, 0, sizeof(lpid_inuse));
 156
 157         if (cpu_has_feature(CPU_FTR_ARCH_206)) {
 158                 host_lpid = mfspr(SPRN_LPID);   /* POWER7 */
 159                 rsvd_lpid = LPID_RSVD;
 160         } else {
 161                 host_lpid = 0;                  /* PPC970 */
 162                 rsvd_lpid = MAX_LPID_970;
 163         }
 164
 165         set_bit(host_lpid, lpid_inuse);
 166         /* rsvd_lpid is reserved for use in partition switching */
 167         set_bit(rsvd_lpid, lpid_inuse);
 168
 169         return 0;
 170 }
 171
 172 void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)
 173 {
 174 }
 175
 176 static void kvmppc_mmu_book3s_64_hv_reset_msr(struct kvm_vcpu *vcpu)
 177 {
 178         kvmppc_set_msr(vcpu, MSR_SF | MSR_ME);
 179 }
 180
 181 static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
 182                                 struct kvmppc_pte *gpte, bool data)
 183 {
 184         return -ENOENT;
 185 }
 186
 187 void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu)
 188 {
 189         struct kvmppc_mmu *mmu = &vcpu->arch.mmu;
 190
 191         if (cpu_has_feature(CPU_FTR_ARCH_206))
 192                 vcpu->arch.slb_nr = 32;         /* POWER7 */
 193         else
 194                 vcpu->arch.slb_nr = 64;
 195
 196         mmu->xlate = kvmppc_mmu_book3s_64_hv_xlate;
 197         mmu->reset_msr = kvmppc_mmu_book3s_64_hv_reset_msr;
 198
 199         vcpu->arch.hflags |= BOOK3S_HFLAG_SLB;
 200 }