diff options
Diffstat (limited to 'tools/testing/selftests/kvm/lib/kvm_util.c')
| -rw-r--r-- | tools/testing/selftests/kvm/lib/kvm_util.c | 249 |
1 files changed, 149 insertions, 100 deletions
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index 1b197426f29f..33fefeb3ca44 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -4,11 +4,10 @@ * * Copyright (C) 2018, Google LLC. */ - -#define _GNU_SOURCE /* for program_invocation_name */ #include "test_util.h" #include "kvm_util.h" #include "processor.h" +#include "ucall_common.h" #include <assert.h> #include <sched.h> @@ -20,6 +19,10 @@ #define KVM_UTIL_MIN_PFN 2 +uint32_t guest_random_seed; +struct guest_random_state guest_rng; +static uint32_t last_guest_seed; + static int vcpu_mmap_sz(void); int open_path_or_exit(const char *path, int flags) @@ -52,13 +55,13 @@ int open_kvm_dev_path_or_exit(void) return _open_kvm_dev_path_or_exit(O_RDONLY); } -static bool get_module_param_bool(const char *module_name, const char *param) +static ssize_t get_module_param(const char *module_name, const char *param, + void *buffer, size_t buffer_size) { const int path_size = 128; char path[path_size]; - char value; - ssize_t r; - int fd; + ssize_t bytes_read; + int fd, r; r = snprintf(path, path_size, "/sys/module/%s/parameters/%s", module_name, param); @@ -67,11 +70,46 @@ static bool get_module_param_bool(const char *module_name, const char *param) fd = open_path_or_exit(path, O_RDONLY); - r = read(fd, &value, 1); - TEST_ASSERT(r == 1, "read(%s) failed", path); + bytes_read = read(fd, buffer, buffer_size); + TEST_ASSERT(bytes_read > 0, "read(%s) returned %ld, wanted %ld bytes", + path, bytes_read, buffer_size); r = close(fd); TEST_ASSERT(!r, "close(%s) failed", path); + return bytes_read; +} + +static int get_module_param_integer(const char *module_name, const char *param) +{ + /* + * 16 bytes to hold a 64-bit value (1 byte per char), 1 byte for the + * NUL char, and 1 byte because the kernel sucks and inserts a newline + * at the end. + */ + char value[16 + 1 + 1]; + ssize_t r; + + memset(value, '\0', sizeof(value)); + + r = get_module_param(module_name, param, value, sizeof(value)); + TEST_ASSERT(value[r - 1] == '\n', + "Expected trailing newline, got char '%c'", value[r - 1]); + + /* + * Squash the newline, otherwise atoi_paranoid() will complain about + * trailing non-NUL characters in the string. + */ + value[r - 1] = '\0'; + return atoi_paranoid(value); +} + +static bool get_module_param_bool(const char *module_name, const char *param) +{ + char value; + ssize_t r; + + r = get_module_param(module_name, param, &value, sizeof(value)); + TEST_ASSERT_EQ(r, 1); if (value == 'Y') return true; @@ -96,6 +134,21 @@ bool get_kvm_amd_param_bool(const char *param) return get_module_param_bool("kvm_amd", param); } +int get_kvm_param_integer(const char *param) +{ + return get_module_param_integer("kvm", param); +} + +int get_kvm_intel_param_integer(const char *param) +{ + return get_module_param_integer("kvm_intel", param); +} + +int get_kvm_amd_param_integer(const char *param) +{ + return get_module_param_integer("kvm_amd", param); +} + /* * Capability * @@ -266,6 +319,7 @@ struct kvm_vm *____vm_create(struct vm_shape shape) case VM_MODE_PXXV48_4K: #ifdef __x86_64__ kvm_get_cpu_address_width(&vm->pa_bits, &vm->va_bits); + kvm_init_vm_address_properties(vm); /* * Ignore KVM support for 5-level paging (vm->va_bits == 57), * it doesn't take effect unless a CR4.LA57 is set, which it @@ -381,6 +435,13 @@ struct kvm_vm *__vm_create(struct vm_shape shape, uint32_t nr_runnable_vcpus, slot0 = memslot2region(vm, 0); ucall_init(vm, slot0->region.guest_phys_addr + slot0->region.memory_size); + if (guest_random_seed != last_guest_seed) { + pr_info("Random seed: 0x%x\n", guest_random_seed); + last_guest_seed = guest_random_seed; + } + guest_rng = new_guest_random_state(guest_random_seed); + sync_global_to_guest(vm, guest_rng); + kvm_arch_vm_post_create(vm); return vm; @@ -651,21 +712,16 @@ void kvm_vm_release(struct kvm_vm *vmp) } static void __vm_mem_region_delete(struct kvm_vm *vm, - struct userspace_mem_region *region, - bool unlink) + struct userspace_mem_region *region) { int ret; - if (unlink) { - rb_erase(®ion->gpa_node, &vm->regions.gpa_tree); - rb_erase(®ion->hva_node, &vm->regions.hva_tree); - hash_del(®ion->slot_node); - } - - region->region.memory_size = 0; - vm_ioctl(vm, KVM_SET_USER_MEMORY_REGION2, ®ion->region); + rb_erase(®ion->gpa_node, &vm->regions.gpa_tree); + rb_erase(®ion->hva_node, &vm->regions.hva_tree); + hash_del(®ion->slot_node); sparsebit_free(®ion->unused_phy_pages); + sparsebit_free(®ion->protected_phy_pages); ret = munmap(region->mmap_start, region->mmap_size); TEST_ASSERT(!ret, __KVM_SYSCALL_ERROR("munmap()", ret)); if (region->fd >= 0) { @@ -700,7 +756,7 @@ void kvm_vm_free(struct kvm_vm *vmp) /* Free userspace_mem_regions. */ hash_for_each_safe(vmp->regions.slot_hash, ctr, node, region, slot_node) - __vm_mem_region_delete(vmp, region, false); + __vm_mem_region_delete(vmp, region); /* Free sparsebit arrays. */ sparsebit_free(&vmp->vpages_valid); @@ -732,76 +788,6 @@ int kvm_memfd_alloc(size_t size, bool hugepages) return fd; } -/* - * Memory Compare, host virtual to guest virtual - * - * Input Args: - * hva - Starting host virtual address - * vm - Virtual Machine - * gva - Starting guest virtual address - * len - number of bytes to compare - * - * Output Args: None - * - * Input/Output Args: None - * - * Return: - * Returns 0 if the bytes starting at hva for a length of len - * are equal the guest virtual bytes starting at gva. Returns - * a value < 0, if bytes at hva are less than those at gva. - * Otherwise a value > 0 is returned. - * - * Compares the bytes starting at the host virtual address hva, for - * a length of len, to the guest bytes starting at the guest virtual - * address given by gva. - */ -int kvm_memcmp_hva_gva(void *hva, struct kvm_vm *vm, vm_vaddr_t gva, size_t len) -{ - size_t amt; - - /* - * Compare a batch of bytes until either a match is found - * or all the bytes have been compared. - */ - for (uintptr_t offset = 0; offset < len; offset += amt) { - uintptr_t ptr1 = (uintptr_t)hva + offset; - - /* - * Determine host address for guest virtual address - * at offset. - */ - uintptr_t ptr2 = (uintptr_t)addr_gva2hva(vm, gva + offset); - - /* - * Determine amount to compare on this pass. - * Don't allow the comparsion to cross a page boundary. - */ - amt = len - offset; - if ((ptr1 >> vm->page_shift) != ((ptr1 + amt) >> vm->page_shift)) - amt = vm->page_size - (ptr1 % vm->page_size); - if ((ptr2 >> vm->page_shift) != ((ptr2 + amt) >> vm->page_shift)) - amt = vm->page_size - (ptr2 % vm->page_size); - - assert((ptr1 >> vm->page_shift) == ((ptr1 + amt - 1) >> vm->page_shift)); - assert((ptr2 >> vm->page_shift) == ((ptr2 + amt - 1) >> vm->page_shift)); - - /* - * Perform the comparison. If there is a difference - * return that result to the caller, otherwise need - * to continue on looking for a mismatch. - */ - int ret = memcmp((void *)ptr1, (void *)ptr2, amt); - if (ret != 0) - return ret; - } - - /* - * No mismatch found. Let the caller know the two memory - * areas are equal. - */ - return 0; -} - static void vm_userspace_mem_region_gpa_insert(struct rb_root *gpa_tree, struct userspace_mem_region *region) { @@ -877,6 +863,10 @@ void vm_set_user_memory_region(struct kvm_vm *vm, uint32_t slot, uint32_t flags, errno, strerror(errno)); } +#define TEST_REQUIRE_SET_USER_MEMORY_REGION2() \ + __TEST_REQUIRE(kvm_has_cap(KVM_CAP_USER_MEMORY2), \ + "KVM selftests now require KVM_SET_USER_MEMORY_REGION2 (introduced in v6.8)") + int __vm_set_user_memory_region2(struct kvm_vm *vm, uint32_t slot, uint32_t flags, uint64_t gpa, uint64_t size, void *hva, uint32_t guest_memfd, uint64_t guest_memfd_offset) @@ -891,6 +881,8 @@ int __vm_set_user_memory_region2(struct kvm_vm *vm, uint32_t slot, uint32_t flag .guest_memfd_offset = guest_memfd_offset, }; + TEST_REQUIRE_SET_USER_MEMORY_REGION2(); + return ioctl(vm->fd, KVM_SET_USER_MEMORY_REGION2, ®ion); } @@ -917,6 +909,8 @@ void vm_mem_add(struct kvm_vm *vm, enum vm_mem_backing_src_type src_type, size_t mem_size = npages * vm->page_size; size_t alignment; + TEST_REQUIRE_SET_USER_MEMORY_REGION2(); + TEST_ASSERT(vm_adjust_num_guest_pages(vm->mode, npages) == npages, "Number of guest pages is not compatible with the host. " "Try npages=%d", vm_adjust_num_guest_pages(vm->mode, npages)); @@ -1047,6 +1041,8 @@ void vm_mem_add(struct kvm_vm *vm, enum vm_mem_backing_src_type src_type, } region->unused_phy_pages = sparsebit_alloc(); + if (vm_arch_has_protected_memory(vm)) + region->protected_phy_pages = sparsebit_alloc(); sparsebit_set_num(region->unused_phy_pages, guest_paddr >> vm->page_shift, npages); region->region.slot = slot; @@ -1198,7 +1194,12 @@ void vm_mem_region_move(struct kvm_vm *vm, uint32_t slot, uint64_t new_gpa) */ void vm_mem_region_delete(struct kvm_vm *vm, uint32_t slot) { - __vm_mem_region_delete(vm, memslot2region(vm, slot), true); + struct userspace_mem_region *region = memslot2region(vm, slot); + + region->region.memory_size = 0; + vm_ioctl(vm, KVM_SET_USER_MEMORY_REGION2, ®ion->region); + + __vm_mem_region_delete(vm, region); } void vm_guest_mem_fallocate(struct kvm_vm *vm, uint64_t base, uint64_t size, @@ -1377,15 +1378,17 @@ va_found: return pgidx_start * vm->page_size; } -vm_vaddr_t __vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min, - enum kvm_mem_region_type type) +static vm_vaddr_t ____vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, + vm_vaddr_t vaddr_min, + enum kvm_mem_region_type type, + bool protected) { uint64_t pages = (sz >> vm->page_shift) + ((sz % vm->page_size) != 0); virt_pgd_alloc(vm); - vm_paddr_t paddr = vm_phy_pages_alloc(vm, pages, - KVM_UTIL_MIN_PFN * vm->page_size, - vm->memslots[type]); + vm_paddr_t paddr = __vm_phy_pages_alloc(vm, pages, + KVM_UTIL_MIN_PFN * vm->page_size, + vm->memslots[type], protected); /* * Find an unused range of virtual page addresses of at least @@ -1405,6 +1408,20 @@ vm_vaddr_t __vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min, return vaddr_start; } +vm_vaddr_t __vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min, + enum kvm_mem_region_type type) +{ + return ____vm_vaddr_alloc(vm, sz, vaddr_min, type, + vm_arch_has_protected_memory(vm)); +} + +vm_vaddr_t vm_vaddr_alloc_shared(struct kvm_vm *vm, size_t sz, + vm_vaddr_t vaddr_min, + enum kvm_mem_region_type type) +{ + return ____vm_vaddr_alloc(vm, sz, vaddr_min, type, false); +} + /* * VM Virtual Address Allocate * @@ -1527,6 +1544,8 @@ void *addr_gpa2hva(struct kvm_vm *vm, vm_paddr_t gpa) { struct userspace_mem_region *region; + gpa = vm_untag_gpa(vm, gpa); + region = userspace_mem_region_find(vm, gpa, gpa); if (!region) { TEST_FAIL("No vm physical memory at 0x%lx", gpa); @@ -1629,7 +1648,8 @@ int _vcpu_run(struct kvm_vcpu *vcpu) rc = __vcpu_run(vcpu); } while (rc == -1 && errno == EINTR); - assert_on_unhandled_exception(vcpu); + if (!rc) + assert_on_unhandled_exception(vcpu); return rc; } @@ -1873,6 +1893,10 @@ void vm_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent) region->host_mem); fprintf(stream, "%*sunused_phy_pages: ", indent + 2, ""); sparsebit_dump(stream, region->unused_phy_pages, 0); + if (region->protected_phy_pages) { + fprintf(stream, "%*sprotected_phy_pages: ", indent + 2, ""); + sparsebit_dump(stream, region->protected_phy_pages, 0); + } } fprintf(stream, "%*sMapped Virtual Pages:\n", indent, ""); sparsebit_dump(stream, vm->vpages_mapped, indent + 2); @@ -1974,6 +1998,7 @@ const char *exit_reason_str(unsigned int exit_reason) * num - number of pages * paddr_min - Physical address minimum * memslot - Memory region to allocate page from + * protected - True if the pages will be used as protected/private memory * * Output Args: None * @@ -1985,8 +2010,9 @@ const char *exit_reason_str(unsigned int exit_reason) * and their base address is returned. A TEST_ASSERT failure occurs if * not enough pages are available at or above paddr_min. */ -vm_paddr_t vm_phy_pages_alloc(struct kvm_vm *vm, size_t num, - vm_paddr_t paddr_min, uint32_t memslot) +vm_paddr_t __vm_phy_pages_alloc(struct kvm_vm *vm, size_t num, + vm_paddr_t paddr_min, uint32_t memslot, + bool protected) { struct userspace_mem_region *region; sparsebit_idx_t pg, base; @@ -1999,8 +2025,10 @@ vm_paddr_t vm_phy_pages_alloc(struct kvm_vm *vm, size_t num, paddr_min, vm->page_size); region = memslot2region(vm, memslot); - base = pg = paddr_min >> vm->page_shift; + TEST_ASSERT(!protected || region->protected_phy_pages, + "Region doesn't support protected memory"); + base = pg = paddr_min >> vm->page_shift; do { for (; pg < base + num; ++pg) { if (!sparsebit_is_set(region->unused_phy_pages, pg)) { @@ -2019,8 +2047,11 @@ vm_paddr_t vm_phy_pages_alloc(struct kvm_vm *vm, size_t num, abort(); } - for (pg = base; pg < base + num; ++pg) + for (pg = base; pg < base + num; ++pg) { sparsebit_clear(region->unused_phy_pages, pg); + if (protected) + sparsebit_set(region->protected_phy_pages, pg); + } return base * vm->page_size; } @@ -2222,5 +2253,23 @@ void __attribute((constructor)) kvm_selftest_init(void) /* Tell stdout not to buffer its content. */ setbuf(stdout, NULL); + guest_random_seed = last_guest_seed = random(); + pr_info("Random seed: 0x%x\n", guest_random_seed); + kvm_selftest_arch_init(); } + +bool vm_is_gpa_protected(struct kvm_vm *vm, vm_paddr_t paddr) +{ + sparsebit_idx_t pg = 0; + struct userspace_mem_region *region; + + if (!vm_arch_has_protected_memory(vm)) + return false; + + region = userspace_mem_region_find(vm, paddr, paddr); + TEST_ASSERT(region, "No vm physical memory at 0x%lx", paddr); + + pg = paddr >> vm->page_shift; + return sparsebit_is_set(region->protected_phy_pages, pg); +} |