tools/testing/selftests/kvm/lib/s390x/processor.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * KVM selftest s390x library code - CPU-related functions (page tables...)
   4  *
   5  * Copyright (C) 2019, Red Hat, Inc.
   6  */
   7
   8 #include "processor.h"
   9 #include "kvm_util.h"
  10 #include "../kvm_util_internal.h"
  11
  12 #define PAGES_PER_REGION 4
  13
  14 void virt_pgd_alloc(struct kvm_vm *vm)
  15 {
  16         vm_paddr_t paddr;
  17
  18         TEST_ASSERT(vm->page_size == 4096, "Unsupported page size: 0x%x",
  19                     vm->page_size);
  20
  21         if (vm->pgd_created)
  22                 return;
  23
  24         paddr = vm_phy_pages_alloc(vm, PAGES_PER_REGION,
  25                                    KVM_GUEST_PAGE_TABLE_MIN_PADDR, 0);
  26         memset(addr_gpa2hva(vm, paddr), 0xff, PAGES_PER_REGION * vm->page_size);
  27
  28         vm->pgd = paddr;
  29         vm->pgd_created = true;
  30 }
  31
  32 /*
  33  * Allocate 4 pages for a region/segment table (ri < 4), or one page for
  34  * a page table (ri == 4). Returns a suitable region/segment table entry
  35  * which points to the freshly allocated pages.
  36  */
  37 static uint64_t virt_alloc_region(struct kvm_vm *vm, int ri)
  38 {
  39         uint64_t taddr;
  40
  41         taddr = vm_phy_pages_alloc(vm,  ri < 4 ? PAGES_PER_REGION : 1,
  42                                    KVM_GUEST_PAGE_TABLE_MIN_PADDR, 0);
  43         memset(addr_gpa2hva(vm, taddr), 0xff, PAGES_PER_REGION * vm->page_size);
  44
  45         return (taddr & REGION_ENTRY_ORIGIN)
  46                 | (((4 - ri) << 2) & REGION_ENTRY_TYPE)
  47                 | ((ri < 4 ? (PAGES_PER_REGION - 1) : 0) & REGION_ENTRY_LENGTH);
  48 }
  49
  50 void virt_pg_map(struct kvm_vm *vm, uint64_t gva, uint64_t gpa)
  51 {
  52         int ri, idx;
  53         uint64_t *entry;
  54
  55         TEST_ASSERT((gva % vm->page_size) == 0,
  56                 "Virtual address not on page boundary,\n"
  57                 "  vaddr: 0x%lx vm->page_size: 0x%x",
  58                 gva, vm->page_size);
  59         TEST_ASSERT(sparsebit_is_set(vm->vpages_valid,
  60                 (gva >> vm->page_shift)),
  61                 "Invalid virtual address, vaddr: 0x%lx",
  62                 gva);
  63         TEST_ASSERT((gpa % vm->page_size) == 0,
  64                 "Physical address not on page boundary,\n"
  65                 "  paddr: 0x%lx vm->page_size: 0x%x",
  66                 gva, vm->page_size);
  67         TEST_ASSERT((gpa >> vm->page_shift) <= vm->max_gfn,
  68                 "Physical address beyond beyond maximum supported,\n"
  69                 "  paddr: 0x%lx vm->max_gfn: 0x%lx vm->page_size: 0x%x",
  70                 gva, vm->max_gfn, vm->page_size);
  71
  72         /* Walk through region and segment tables */
  73         entry = addr_gpa2hva(vm, vm->pgd);
  74         for (ri = 1; ri <= 4; ri++) {
  75                 idx = (gva >> (64 - 11 * ri)) & 0x7ffu;
  76                 if (entry[idx] & REGION_ENTRY_INVALID)
  77                         entry[idx] = virt_alloc_region(vm, ri);
  78                 entry = addr_gpa2hva(vm, entry[idx] & REGION_ENTRY_ORIGIN);
  79         }
  80
  81         /* Fill in page table entry */
  82         idx = (gva >> 12) & 0x0ffu;             /* page index */
  83         if (!(entry[idx] & PAGE_INVALID))
  84                 fprintf(stderr,
  85                         "WARNING: PTE for gpa=0x%"PRIx64" already set!\n", gpa);
  86         entry[idx] = gpa;
  87 }
  88
  89 vm_paddr_t addr_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva)
  90 {
  91         int ri, idx;
  92         uint64_t *entry;
  93
  94         TEST_ASSERT(vm->page_size == 4096, "Unsupported page size: 0x%x",
  95                     vm->page_size);
  96
  97         entry = addr_gpa2hva(vm, vm->pgd);
  98         for (ri = 1; ri <= 4; ri++) {
  99                 idx = (gva >> (64 - 11 * ri)) & 0x7ffu;
 100                 TEST_ASSERT(!(entry[idx] & REGION_ENTRY_INVALID),
 101                             "No region mapping for vm virtual address 0x%lx",
 102                             gva);
 103                 entry = addr_gpa2hva(vm, entry[idx] & REGION_ENTRY_ORIGIN);
 104         }
 105
 106         idx = (gva >> 12) & 0x0ffu;             /* page index */
 107
 108         TEST_ASSERT(!(entry[idx] & PAGE_INVALID),
 109                     "No page mapping for vm virtual address 0x%lx", gva);
 110
 111         return (entry[idx] & ~0xffful) + (gva & 0xffful);
 112 }
 113
 114 static void virt_dump_ptes(FILE *stream, struct kvm_vm *vm, uint8_t indent,
 115                            uint64_t ptea_start)
 116 {
 117         uint64_t *pte, ptea;
 118
 119         for (ptea = ptea_start; ptea < ptea_start + 0x100 * 8; ptea += 8) {
 120                 pte = addr_gpa2hva(vm, ptea);
 121                 if (*pte & PAGE_INVALID)
 122                         continue;
 123                 fprintf(stream, "%*spte @ 0x%lx: 0x%016lx\n",
 124                         indent, "", ptea, *pte);
 125         }
 126 }
 127
 128 static void virt_dump_region(FILE *stream, struct kvm_vm *vm, uint8_t indent,
 129                              uint64_t reg_tab_addr)
 130 {
 131         uint64_t addr, *entry;
 132
 133         for (addr = reg_tab_addr; addr < reg_tab_addr + 0x400 * 8; addr += 8) {
 134                 entry = addr_gpa2hva(vm, addr);
 135                 if (*entry & REGION_ENTRY_INVALID)
 136                         continue;
 137                 fprintf(stream, "%*srt%lde @ 0x%lx: 0x%016lx\n",
 138                         indent, "", 4 - ((*entry & REGION_ENTRY_TYPE) >> 2),
 139                         addr, *entry);
 140                 if (*entry & REGION_ENTRY_TYPE) {
 141                         virt_dump_region(stream, vm, indent + 2,
 142                                          *entry & REGION_ENTRY_ORIGIN);
 143                 } else {
 144                         virt_dump_ptes(stream, vm, indent + 2,
 145                                        *entry & REGION_ENTRY_ORIGIN);
 146                 }
 147         }
 148 }
 149
 150 void virt_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent)
 151 {
 152         if (!vm->pgd_created)
 153                 return;
 154
 155         virt_dump_region(stream, vm, indent, vm->pgd);
 156 }
 157
 158 void vm_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code)
 159 {
 160         size_t stack_size =  DEFAULT_STACK_PGS * getpagesize();
 161         uint64_t stack_vaddr;
 162         struct kvm_regs regs;
 163         struct kvm_sregs sregs;
 164         struct kvm_run *run;
 165
 166         TEST_ASSERT(vm->page_size == 4096, "Unsupported page size: 0x%x",
 167                     vm->page_size);
 168
 169         stack_vaddr = vm_vaddr_alloc(vm, stack_size,
 170                                      DEFAULT_GUEST_STACK_VADDR_MIN);
 171
 172         vm_vcpu_add(vm, vcpuid);
 173
 174         /* Setup guest registers */
 175         vcpu_regs_get(vm, vcpuid, &regs);
 176         regs.gprs[15] = stack_vaddr + (DEFAULT_STACK_PGS * getpagesize()) - 160;
 177         vcpu_regs_set(vm, vcpuid, &regs);
 178
 179         vcpu_sregs_get(vm, vcpuid, &sregs);
 180         sregs.crs[0] |= 0x00040000;             /* Enable floating point regs */
 181         sregs.crs[1] = vm->pgd | 0xf;           /* Primary region table */
 182         vcpu_sregs_set(vm, vcpuid, &sregs);
 183
 184         run = vcpu_state(vm, vcpuid);
 185         run->psw_mask = 0x0400000180000000ULL;  /* DAT enabled + 64 bit mode */
 186         run->psw_addr = (uintptr_t)guest_code;
 187 }
 188
 189 void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...)
 190 {
 191         va_list ap;
 192         struct kvm_regs regs;
 193         int i;
 194
 195         TEST_ASSERT(num >= 1 && num <= 5, "Unsupported number of args,\n"
 196                     "  num: %u\n",
 197                     num);
 198
 199         va_start(ap, num);
 200         vcpu_regs_get(vm, vcpuid, &regs);
 201
 202         for (i = 0; i < num; i++)
 203                 regs.gprs[i + 2] = va_arg(ap, uint64_t);
 204
 205         vcpu_regs_set(vm, vcpuid, &regs);
 206         va_end(ap);
 207 }
 208
 209 void vcpu_dump(FILE *stream, struct kvm_vm *vm, uint32_t vcpuid, uint8_t indent)
 210 {
 211         struct vcpu *vcpu = vcpu_find(vm, vcpuid);
 212
 213         if (!vcpu)
 214                 return;
 215
 216         fprintf(stream, "%*spstate: psw: 0x%.16llx:0x%.16llx\n",
 217                 indent, "", vcpu->state->psw_mask, vcpu->state->psw_addr);
 218 }
 219
 220 void assert_on_unhandled_exception(struct kvm_vm *vm, uint32_t vcpuid)
 221 {
 222 }