1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 2018, Red Hat, Inc.
8 #include <linux/compiler.h>
12 #include "../kvm_util_internal.h"
13 #include "processor.h"
15 #define DEFAULT_ARM64_GUEST_STACK_VADDR_MIN 0xac0000
17 static vm_vaddr_t exception_handlers;
19 static uint64_t page_align(struct kvm_vm *vm, uint64_t v)
21 return (v + vm->page_size) & ~(vm->page_size - 1);
24 static uint64_t pgd_index(struct kvm_vm *vm, vm_vaddr_t gva)
26 unsigned int shift = (vm->pgtable_levels - 1) * (vm->page_shift - 3) + vm->page_shift;
27 uint64_t mask = (1UL << (vm->va_bits - shift)) - 1;
29 return (gva >> shift) & mask;
32 static uint64_t pud_index(struct kvm_vm *vm, vm_vaddr_t gva)
34 unsigned int shift = 2 * (vm->page_shift - 3) + vm->page_shift;
35 uint64_t mask = (1UL << (vm->page_shift - 3)) - 1;
37 TEST_ASSERT(vm->pgtable_levels == 4,
38 "Mode %d does not have 4 page table levels", vm->mode);
40 return (gva >> shift) & mask;
43 static uint64_t pmd_index(struct kvm_vm *vm, vm_vaddr_t gva)
45 unsigned int shift = (vm->page_shift - 3) + vm->page_shift;
46 uint64_t mask = (1UL << (vm->page_shift - 3)) - 1;
48 TEST_ASSERT(vm->pgtable_levels >= 3,
49 "Mode %d does not have >= 3 page table levels", vm->mode);
51 return (gva >> shift) & mask;
54 static uint64_t pte_index(struct kvm_vm *vm, vm_vaddr_t gva)
56 uint64_t mask = (1UL << (vm->page_shift - 3)) - 1;
57 return (gva >> vm->page_shift) & mask;
60 static uint64_t pte_addr(struct kvm_vm *vm, uint64_t entry)
62 uint64_t mask = ((1UL << (vm->va_bits - vm->page_shift)) - 1) << vm->page_shift;
66 static uint64_t ptrs_per_pgd(struct kvm_vm *vm)
68 unsigned int shift = (vm->pgtable_levels - 1) * (vm->page_shift - 3) + vm->page_shift;
69 return 1 << (vm->va_bits - shift);
72 static uint64_t __maybe_unused ptrs_per_pte(struct kvm_vm *vm)
74 return 1 << (vm->page_shift - 3);
77 void virt_pgd_alloc(struct kvm_vm *vm)
79 if (!vm->pgd_created) {
80 vm_paddr_t paddr = vm_phy_pages_alloc(vm,
81 page_align(vm, ptrs_per_pgd(vm) * 8) / vm->page_size,
82 KVM_GUEST_PAGE_TABLE_MIN_PADDR, 0);
84 vm->pgd_created = true;
88 static void _virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr,
91 uint8_t attr_idx = flags & 7;
94 TEST_ASSERT((vaddr % vm->page_size) == 0,
95 "Virtual address not on page boundary,\n"
96 " vaddr: 0x%lx vm->page_size: 0x%x", vaddr, vm->page_size);
97 TEST_ASSERT(sparsebit_is_set(vm->vpages_valid,
98 (vaddr >> vm->page_shift)),
99 "Invalid virtual address, vaddr: 0x%lx", vaddr);
100 TEST_ASSERT((paddr % vm->page_size) == 0,
101 "Physical address not on page boundary,\n"
102 " paddr: 0x%lx vm->page_size: 0x%x", paddr, vm->page_size);
103 TEST_ASSERT((paddr >> vm->page_shift) <= vm->max_gfn,
104 "Physical address beyond beyond maximum supported,\n"
105 " paddr: 0x%lx vm->max_gfn: 0x%lx vm->page_size: 0x%x",
106 paddr, vm->max_gfn, vm->page_size);
108 ptep = addr_gpa2hva(vm, vm->pgd) + pgd_index(vm, vaddr) * 8;
110 *ptep = vm_alloc_page_table(vm) | 3;
112 switch (vm->pgtable_levels) {
114 ptep = addr_gpa2hva(vm, pte_addr(vm, *ptep)) + pud_index(vm, vaddr) * 8;
116 *ptep = vm_alloc_page_table(vm) | 3;
119 ptep = addr_gpa2hva(vm, pte_addr(vm, *ptep)) + pmd_index(vm, vaddr) * 8;
121 *ptep = vm_alloc_page_table(vm) | 3;
124 ptep = addr_gpa2hva(vm, pte_addr(vm, *ptep)) + pte_index(vm, vaddr) * 8;
127 TEST_FAIL("Page table levels must be 2, 3, or 4");
131 *ptep |= (attr_idx << 2) | (1 << 10) /* Access Flag */;
134 void virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr)
136 uint64_t attr_idx = 4; /* NORMAL (See DEFAULT_MAIR_EL1) */
138 _virt_pg_map(vm, vaddr, paddr, attr_idx);
141 vm_paddr_t addr_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva)
145 if (!vm->pgd_created)
148 ptep = addr_gpa2hva(vm, vm->pgd) + pgd_index(vm, gva) * 8;
152 switch (vm->pgtable_levels) {
154 ptep = addr_gpa2hva(vm, pte_addr(vm, *ptep)) + pud_index(vm, gva) * 8;
159 ptep = addr_gpa2hva(vm, pte_addr(vm, *ptep)) + pmd_index(vm, gva) * 8;
164 ptep = addr_gpa2hva(vm, pte_addr(vm, *ptep)) + pte_index(vm, gva) * 8;
169 TEST_FAIL("Page table levels must be 2, 3, or 4");
172 return pte_addr(vm, *ptep) + (gva & (vm->page_size - 1));
175 TEST_FAIL("No mapping for vm virtual address, gva: 0x%lx", gva);
179 static void pte_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent, uint64_t page, int level)
182 static const char * const type[] = { "", "pud", "pmd", "pte" };
188 for (pte = page; pte < page + ptrs_per_pte(vm) * 8; pte += 8) {
189 ptep = addr_gpa2hva(vm, pte);
192 fprintf(stream, "%*s%s: %lx: %lx at %p\n", indent, "", type[level], pte, *ptep, ptep);
193 pte_dump(stream, vm, indent + 1, pte_addr(vm, *ptep), level + 1);
198 void virt_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent)
200 int level = 4 - (vm->pgtable_levels - 1);
203 if (!vm->pgd_created)
206 for (pgd = vm->pgd; pgd < vm->pgd + ptrs_per_pgd(vm) * 8; pgd += 8) {
207 ptep = addr_gpa2hva(vm, pgd);
210 fprintf(stream, "%*spgd: %lx: %lx at %p\n", indent, "", pgd, *ptep, ptep);
211 pte_dump(stream, vm, indent + 1, pte_addr(vm, *ptep), level);
215 void aarch64_vcpu_setup(struct kvm_vm *vm, int vcpuid, struct kvm_vcpu_init *init)
217 struct kvm_vcpu_init default_init = { .target = -1, };
218 uint64_t sctlr_el1, tcr_el1;
221 init = &default_init;
223 if (init->target == -1) {
224 struct kvm_vcpu_init preferred;
225 vm_ioctl(vm, KVM_ARM_PREFERRED_TARGET, &preferred);
226 init->target = preferred.target;
229 vcpu_ioctl(vm, vcpuid, KVM_ARM_VCPU_INIT, init);
232 * Enable FP/ASIMD to avoid trapping when accessing Q0-Q15
233 * registers, which the variable argument list macros do.
235 set_reg(vm, vcpuid, ARM64_SYS_REG(CPACR_EL1), 3 << 20);
237 get_reg(vm, vcpuid, ARM64_SYS_REG(SCTLR_EL1), &sctlr_el1);
238 get_reg(vm, vcpuid, ARM64_SYS_REG(TCR_EL1), &tcr_el1);
241 case VM_MODE_P52V48_4K:
242 TEST_FAIL("AArch64 does not support 4K sized pages "
243 "with 52-bit physical address ranges");
244 case VM_MODE_PXXV48_4K:
245 TEST_FAIL("AArch64 does not support 4K sized pages "
246 "with ANY-bit physical address ranges");
247 case VM_MODE_P52V48_64K:
248 tcr_el1 |= 1ul << 14; /* TG0 = 64KB */
249 tcr_el1 |= 6ul << 32; /* IPS = 52 bits */
251 case VM_MODE_P48V48_4K:
252 tcr_el1 |= 0ul << 14; /* TG0 = 4KB */
253 tcr_el1 |= 5ul << 32; /* IPS = 48 bits */
255 case VM_MODE_P48V48_64K:
256 tcr_el1 |= 1ul << 14; /* TG0 = 64KB */
257 tcr_el1 |= 5ul << 32; /* IPS = 48 bits */
259 case VM_MODE_P40V48_4K:
260 tcr_el1 |= 0ul << 14; /* TG0 = 4KB */
261 tcr_el1 |= 2ul << 32; /* IPS = 40 bits */
263 case VM_MODE_P40V48_64K:
264 tcr_el1 |= 1ul << 14; /* TG0 = 64KB */
265 tcr_el1 |= 2ul << 32; /* IPS = 40 bits */
268 TEST_FAIL("Unknown guest mode, mode: 0x%x", vm->mode);
271 sctlr_el1 |= (1 << 0) | (1 << 2) | (1 << 12) /* M | C | I */;
272 /* TCR_EL1 |= IRGN0:WBWA | ORGN0:WBWA | SH0:Inner-Shareable */;
273 tcr_el1 |= (1 << 8) | (1 << 10) | (3 << 12);
274 tcr_el1 |= (64 - vm->va_bits) /* T0SZ */;
276 set_reg(vm, vcpuid, ARM64_SYS_REG(SCTLR_EL1), sctlr_el1);
277 set_reg(vm, vcpuid, ARM64_SYS_REG(TCR_EL1), tcr_el1);
278 set_reg(vm, vcpuid, ARM64_SYS_REG(MAIR_EL1), DEFAULT_MAIR_EL1);
279 set_reg(vm, vcpuid, ARM64_SYS_REG(TTBR0_EL1), vm->pgd);
282 void vcpu_dump(FILE *stream, struct kvm_vm *vm, uint32_t vcpuid, uint8_t indent)
286 get_reg(vm, vcpuid, ARM64_CORE_REG(regs.pstate), &pstate);
287 get_reg(vm, vcpuid, ARM64_CORE_REG(regs.pc), &pc);
289 fprintf(stream, "%*spstate: 0x%.16lx pc: 0x%.16lx\n",
290 indent, "", pstate, pc);
293 void aarch64_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpuid,
294 struct kvm_vcpu_init *init, void *guest_code)
296 size_t stack_size = vm->page_size == 4096 ?
297 DEFAULT_STACK_PGS * vm->page_size :
299 uint64_t stack_vaddr = vm_vaddr_alloc(vm, stack_size,
300 DEFAULT_ARM64_GUEST_STACK_VADDR_MIN);
302 vm_vcpu_add(vm, vcpuid);
303 aarch64_vcpu_setup(vm, vcpuid, init);
305 set_reg(vm, vcpuid, ARM64_CORE_REG(sp_el1), stack_vaddr + stack_size);
306 set_reg(vm, vcpuid, ARM64_CORE_REG(regs.pc), (uint64_t)guest_code);
309 void vm_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code)
311 aarch64_vcpu_add_default(vm, vcpuid, NULL, guest_code);
314 void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...)
319 TEST_ASSERT(num >= 1 && num <= 8, "Unsupported number of args,\n"
324 for (i = 0; i < num; i++) {
325 set_reg(vm, vcpuid, ARM64_CORE_REG(regs.regs[i]),
326 va_arg(ap, uint64_t));
332 void kvm_exit_unexpected_exception(int vector, uint64_t ec, bool valid_ec)
334 ucall(UCALL_UNHANDLED, 3, vector, ec, valid_ec);
339 void assert_on_unhandled_exception(struct kvm_vm *vm, uint32_t vcpuid)
343 if (get_ucall(vm, vcpuid, &uc) != UCALL_UNHANDLED)
346 if (uc.args[2]) /* valid_ec */ {
347 assert(VECTOR_IS_SYNC(uc.args[0]));
348 TEST_FAIL("Unexpected exception (vector:0x%lx, ec:0x%lx)",
349 uc.args[0], uc.args[1]);
351 assert(!VECTOR_IS_SYNC(uc.args[0]));
352 TEST_FAIL("Unexpected exception (vector:0x%lx)",
358 handler_fn exception_handlers[VECTOR_NUM][ESR_EC_NUM];
361 void vcpu_init_descriptor_tables(struct kvm_vm *vm, uint32_t vcpuid)
365 set_reg(vm, vcpuid, ARM64_SYS_REG(VBAR_EL1), (uint64_t)&vectors);
368 void route_exception(struct ex_regs *regs, int vector)
370 struct handlers *handlers = (struct handlers *)exception_handlers;
375 case VECTOR_SYNC_CURRENT:
376 case VECTOR_SYNC_LOWER_64:
377 ec = (read_sysreg(esr_el1) >> ESR_EC_SHIFT) & ESR_EC_MASK;
380 case VECTOR_IRQ_CURRENT:
381 case VECTOR_IRQ_LOWER_64:
382 case VECTOR_FIQ_CURRENT:
383 case VECTOR_FIQ_LOWER_64:
384 case VECTOR_ERROR_CURRENT:
385 case VECTOR_ERROR_LOWER_64:
391 goto unexpected_exception;
394 if (handlers && handlers->exception_handlers[vector][ec])
395 return handlers->exception_handlers[vector][ec](regs);
397 unexpected_exception:
398 kvm_exit_unexpected_exception(vector, ec, valid_ec);
401 void vm_init_descriptor_tables(struct kvm_vm *vm)
403 vm->handlers = vm_vaddr_alloc(vm, sizeof(struct handlers),
404 vm->page_size, 0, 0);
406 *(vm_vaddr_t *)addr_gva2hva(vm, (vm_vaddr_t)(&exception_handlers)) = vm->handlers;
409 void vm_install_sync_handler(struct kvm_vm *vm, int vector, int ec,
410 void (*handler)(struct ex_regs *))
412 struct handlers *handlers = addr_gva2hva(vm, vm->handlers);
414 assert(VECTOR_IS_SYNC(vector));
415 assert(vector < VECTOR_NUM);
416 assert(ec < ESR_EC_NUM);
417 handlers->exception_handlers[vector][ec] = handler;
420 void vm_install_exception_handler(struct kvm_vm *vm, int vector,
421 void (*handler)(struct ex_regs *))
423 struct handlers *handlers = addr_gva2hva(vm, vm->handlers);
425 assert(!VECTOR_IS_SYNC(vector));
426 assert(vector < VECTOR_NUM);
427 handlers->exception_handlers[vector][0] = handler;