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
11 #define PAGES_PER_REGION 4
12
13 void virt_arch_pgd_alloc(struct kvm_vm *vm)
14 {
15 vm_paddr_t paddr;
16
17 TEST_ASSERT(vm->page_size == 4096, "Unsupported page size: 0x%x",
18 vm->page_size);
19
20 if (vm->pgd_created)
21 return;
22
23 paddr = vm_phy_pages_alloc(vm, PAGES_PER_REGION,
24 KVM_GUEST_PAGE_TABLE_MIN_PADDR,
25 vm->memslots[MEM_REGION_PT]);
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_arch_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_arch_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_arch_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 vcpu_arch_set_entry_point(struct kvm_vcpu *vcpu, void *guest_code)
159 {
160 vcpu->run->psw_addr = (uintptr_t)guest_code;
161 }
162
163 struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id)
164 {
165 size_t stack_size = DEFAULT_STACK_PGS * getpagesize();
166 uint64_t stack_vaddr;
167 struct kvm_regs regs;
168 struct kvm_sregs sregs;
169 struct kvm_vcpu *vcpu;
170
171 TEST_ASSERT(vm->page_size == 4096, "Unsupported page size: 0x%x",
172 vm->page_size);
173
174 stack_vaddr = __vm_vaddr_alloc(vm, stack_size,
175 DEFAULT_GUEST_STACK_VADDR_MIN,
176 MEM_REGION_DATA);
177
178 vcpu = __vm_vcpu_add(vm, vcpu_id);
179
180 /* Setup guest registers */
181 vcpu_regs_get(vcpu, ®s);
182 regs.gprs[15] = stack_vaddr + (DEFAULT_STACK_PGS * getpagesize()) - 160;
183 vcpu_regs_set(vcpu, ®s);
184
185 vcpu_sregs_get(vcpu, &sregs);
186 sregs.crs[0] |= 0x00040000; /* Enable floating point regs */
187 sregs.crs[1] = vm->pgd | 0xf; /* Primary region table */
188 vcpu_sregs_set(vcpu, &sregs);
189
190 vcpu->run->psw_mask = 0x0400000180000000ULL; /* DAT enabled + 64 bit mode */
191
192 return vcpu;
193 }
194
195 void vcpu_args_set(struct kvm_vcpu *vcpu, unsigned int num, ...)
196 {
197 va_list ap;
198 struct kvm_regs regs;
199 int i;
200
201 TEST_ASSERT(num >= 1 && num <= 5, "Unsupported number of args,\n"
202 " num: %u",
203 num);
204
205 va_start(ap, num);
206 vcpu_regs_get(vcpu, ®s);
207
208 for (i = 0; i < num; i++)
209 regs.gprs[i + 2] = va_arg(ap, uint64_t);
210
211 vcpu_regs_set(vcpu, ®s);
212 va_end(ap);
213 }
214
215 void vcpu_arch_dump(FILE *stream, struct kvm_vcpu *vcpu, uint8_t indent)
216 {
217 fprintf(stream, "%*spstate: psw: 0x%.16llx:0x%.16llx\n",
218 indent, "", vcpu->run->psw_mask, vcpu->run->psw_addr);
219 }
220
221 void assert_on_unhandled_exception(struct kvm_vcpu *vcpu)
222 {
223 }
224
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