Signed-off-by: Jing Zhang jingzhangos@google.com --- tools/testing/selftests/kvm/.gitignore | 1 + tools/testing/selftests/kvm/Makefile | 3 + .../testing/selftests/kvm/include/kvm_util.h | 3 + .../selftests/kvm/kvm_bin_form_stats.c | 370 ++++++++++++++++++ tools/testing/selftests/kvm/lib/kvm_util.c | 11 + 5 files changed, 388 insertions(+) create mode 100644 tools/testing/selftests/kvm/kvm_bin_form_stats.c
diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore index 34414e83b3f1..a398ddbb84ae 100644 --- a/tools/testing/selftests/kvm/.gitignore +++ b/tools/testing/selftests/kvm/.gitignore @@ -42,3 +42,4 @@ /memslot_modification_stress_test /set_memory_region_test /steal_time +/kvm_bin_form_stats diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index 6b0a9e70083e..567cfef02b76 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -76,6 +76,7 @@ TEST_GEN_PROGS_x86_64 += kvm_page_table_test TEST_GEN_PROGS_x86_64 += memslot_modification_stress_test TEST_GEN_PROGS_x86_64 += set_memory_region_test TEST_GEN_PROGS_x86_64 += steal_time +TEST_GEN_PROGS_x86_64 += kvm_bin_form_stats
TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list-sve @@ -86,6 +87,7 @@ TEST_GEN_PROGS_aarch64 += kvm_create_max_vcpus TEST_GEN_PROGS_aarch64 += kvm_page_table_test TEST_GEN_PROGS_aarch64 += set_memory_region_test TEST_GEN_PROGS_aarch64 += steal_time +TEST_GEN_PROGS_aarch64 += kvm_bin_form_stats
TEST_GEN_PROGS_s390x = s390x/memop TEST_GEN_PROGS_s390x += s390x/resets @@ -95,6 +97,7 @@ TEST_GEN_PROGS_s390x += dirty_log_test TEST_GEN_PROGS_s390x += kvm_create_max_vcpus TEST_GEN_PROGS_s390x += kvm_page_table_test TEST_GEN_PROGS_s390x += set_memory_region_test +TEST_GEN_PROGS_s390x += kvm_bin_form_stats
TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(UNAME_M)) LIBKVM += $(LIBKVM_$(UNAME_M)) diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h index 0e6cc25642a6..770b54b5a15c 100644 --- a/tools/testing/selftests/kvm/include/kvm_util.h +++ b/tools/testing/selftests/kvm/include/kvm_util.h @@ -378,4 +378,7 @@ uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc); #define GUEST_ASSERT_4(_condition, arg1, arg2, arg3, arg4) \ __GUEST_ASSERT((_condition), 4, (arg1), (arg2), (arg3), (arg4))
+int vm_get_statsfd(struct kvm_vm *vm); +int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid); + #endif /* SELFTEST_KVM_UTIL_H */ diff --git a/tools/testing/selftests/kvm/kvm_bin_form_stats.c b/tools/testing/selftests/kvm/kvm_bin_form_stats.c new file mode 100644 index 000000000000..44dd6341dcaf --- /dev/null +++ b/tools/testing/selftests/kvm/kvm_bin_form_stats.c @@ -0,0 +1,370 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * kvm_bin_form_stats + * + * Copyright (C) 2021, Google LLC. + * + * Test the fd-based interface for KVM statistics. + */ + +#define _GNU_SOURCE /* for program_invocation_short_name */ +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> + +#include "test_util.h" + +#include "kvm_util.h" +#include "asm/kvm.h" +#include "linux/kvm.h" + +int vm_stats_test(struct kvm_vm *vm) +{ + ssize_t ret; + int i, stats_fd, err = -1; + size_t size_desc, size_data = 0; + struct kvm_stats_header header; + struct kvm_stats_desc *stats_desc, *pdesc; + struct kvm_vm_stats_data *stats_data; + + /* Get fd for VM stats */ + stats_fd = vm_get_statsfd(vm); + if (stats_fd < 0) { + perror("Get VM stats fd"); + return err; + } + /* Read kvm vm stats header */ + ret = read(stats_fd, &header, sizeof(header)); + if (ret != sizeof(header)) { + perror("Read VM stats header"); + goto out_close_fd; + } + size_desc = sizeof(*stats_desc) + header.name_size; + /* Check id string in header, that should start with "kvm" */ + if (strncmp(header.id, "kvm", 3) || + strlen(header.id) >= KVM_STATS_ID_MAXLEN) { + printf("Invalid KVM VM stats type!\n"); + goto out_close_fd; + } + /* Sanity check for other fields in header */ + if (header.count == 0) { + err = 0; + goto out_close_fd; + } + /* Check overlap */ + if (header.desc_offset == 0 || header.data_offset == 0 || + header.desc_offset < sizeof(header) || + header.data_offset < sizeof(header)) { + printf("Invalid offset fields in header!\n"); + goto out_close_fd; + } + if (header.desc_offset < header.data_offset && + (header.desc_offset + size_desc * header.count > + header.data_offset)) { + printf("Descriptor block is overlapped with data block!\n"); + goto out_close_fd; + } + + /* Allocate memory for stats descriptors */ + stats_desc = calloc(header.count, size_desc); + if (!stats_desc) { + perror("Allocate memory for VM stats descriptors"); + goto out_close_fd; + } + /* Read kvm vm stats descriptors */ + ret = pread(stats_fd, stats_desc, + size_desc * header.count, header.desc_offset); + if (ret != size_desc * header.count) { + perror("Read KVM VM stats descriptors"); + goto out_free_desc; + } + /* Sanity check for fields in descriptors */ + for (i = 0; i < header.count; ++i) { + pdesc = (void *)stats_desc + i * size_desc; + /* Check type,unit,scale boundaries */ + if ((pdesc->flags & KVM_STATS_TYPE_MASK) > KVM_STATS_TYPE_MAX) { + printf("Unknown KVM stats type!\n"); + goto out_free_desc; + } + if ((pdesc->flags & KVM_STATS_UNIT_MASK) > KVM_STATS_UNIT_MAX) { + printf("Unknown KVM stats unit!\n"); + goto out_free_desc; + } + if ((pdesc->flags & KVM_STATS_SCALE_MASK) > + KVM_STATS_SCALE_MAX) { + printf("Unknown KVM stats scale!\n"); + goto out_free_desc; + } + /* Check exponent for stats unit + * Exponent for counter should be greater than or equal to 0 + * Exponent for unit bytes should be greater than or equal to 0 + * Exponent for unit seconds should be less than or equal to 0 + * Exponent for unit clock cycles should be greater than or + * equal to 0 + */ + switch (pdesc->flags & KVM_STATS_UNIT_MASK) { + case KVM_STATS_UNIT_NONE: + case KVM_STATS_UNIT_BYTES: + case KVM_STATS_UNIT_CYCLES: + if (pdesc->exponent < 0) { + printf("Unsupported KVM stats unit!\n"); + goto out_free_desc; + } + break; + case KVM_STATS_UNIT_SECONDS: + if (pdesc->exponent > 0) { + printf("Unsupported KVM stats unit!\n"); + goto out_free_desc; + } + break; + } + /* Check name string */ + if (strlen(pdesc->name) >= header.name_size) { + printf("KVM stats name(%s) too long!\n", pdesc->name); + goto out_free_desc; + } + /* Check size field, which should not be zero */ + if (pdesc->size == 0) { + printf("KVM descriptor(%s) with size of 0!\n", + pdesc->name); + goto out_free_desc; + } + size_data = pdesc->size * sizeof(stats_data->value[0]); + } + /* Check overlap */ + if (header.data_offset < header.desc_offset && + header.data_offset + size_data > header.desc_offset) { + printf("Data block is overlapped with Descriptor block!\n"); + goto out_free_desc; + } + + /* Allocate memory for stats data */ + stats_data = malloc(size_data); + if (!stats_data) { + perror("Allocate memory for VM stats data"); + goto out_free_desc; + } + /* Read kvm vm stats data */ + ret = pread(stats_fd, stats_data, size_data, header.data_offset); + if (ret != size_data) { + perror("Read KVM VM stats data"); + goto out_free_data; + } + + err = 0; +out_free_data: + free(stats_data); +out_free_desc: + free(stats_desc); +out_close_fd: + close(stats_fd); + return err; +} + +int vcpu_stats_test(struct kvm_vm *vm, int vcpu_id) +{ + ssize_t ret; + int i, stats_fd, err = -1; + size_t size_desc, size_data = 0; + struct kvm_stats_header header; + struct kvm_stats_desc *stats_desc, *pdesc; + struct kvm_vcpu_stats_data *stats_data; + + /* Get fd for VCPU stats */ + stats_fd = vcpu_get_statsfd(vm, vcpu_id); + if (stats_fd < 0) { + perror("Get VCPU stats fd"); + return err; + } + /* Read kvm vcpu stats header */ + ret = read(stats_fd, &header, sizeof(header)); + if (ret != sizeof(header)) { + perror("Read VCPU stats header"); + goto out_close_fd; + } + size_desc = sizeof(*stats_desc) + header.name_size; + /* Check id string in header, that should start with "kvm" */ + if (strncmp(header.id, "kvm", 3) || + strlen(header.id) >= KVM_STATS_ID_MAXLEN) { + printf("Invalid KVM VCPU stats type!\n"); + goto out_close_fd; + } + /* Sanity check for other fields in header */ + if (header.count == 0) { + err = 0; + goto out_close_fd; + } + /* Check overlap */ + if (header.desc_offset == 0 || header.data_offset == 0 || + header.desc_offset < sizeof(header) || + header.data_offset < sizeof(header)) { + printf("Invalid offset fields in header!\n"); + goto out_close_fd; + } + if (header.desc_offset < header.data_offset && + (header.desc_offset + size_desc * header.count > + header.data_offset)) { + printf("Descriptor block is overlapped with data block!\n"); + goto out_close_fd; + } + + /* Allocate memory for stats descriptors */ + stats_desc = calloc(header.count, size_desc); + if (!stats_desc) { + perror("Allocate memory for VCPU stats descriptors"); + goto out_close_fd; + } + /* Read kvm vcpu stats descriptors */ + ret = pread(stats_fd, stats_desc, + size_desc * header.count, header.desc_offset); + if (ret != size_desc * header.count) { + perror("Read KVM VCPU stats descriptors"); + goto out_free_desc; + } + /* Sanity check for fields in descriptors */ + for (i = 0; i < header.count; ++i) { + pdesc = (void *)stats_desc + i * size_desc; + /* Check boundaries */ + if ((pdesc->flags & KVM_STATS_TYPE_MASK) > KVM_STATS_TYPE_MAX) { + printf("Unknown KVM stats type!\n"); + goto out_free_desc; + } + if ((pdesc->flags & KVM_STATS_UNIT_MASK) > KVM_STATS_UNIT_MAX) { + printf("Unknown KVM stats unit!\n"); + goto out_free_desc; + } + if ((pdesc->flags & KVM_STATS_SCALE_MASK) > + KVM_STATS_SCALE_MAX) { + printf("Unknown KVM stats scale!\n"); + goto out_free_desc; + } + /* Check exponent for stats unit + * Exponent for counter should be greater than or equal to 0 + * Exponent for unit bytes should be greater than or equal to 0 + * Exponent for unit seconds should be less than or equal to 0 + * Exponent for unit clock cycles should be greater than or + * equal to 0 + */ + switch (pdesc->flags & KVM_STATS_UNIT_MASK) { + case KVM_STATS_UNIT_NONE: + case KVM_STATS_UNIT_BYTES: + case KVM_STATS_UNIT_CYCLES: + if (pdesc->exponent < 0) { + printf("Unsupported KVM stats unit!\n"); + goto out_free_desc; + } + break; + case KVM_STATS_UNIT_SECONDS: + if (pdesc->exponent > 0) { + printf("Unsupported KVM stats unit!\n"); + goto out_free_desc; + } + break; + } + /* Check name string */ + if (strlen(pdesc->name) >= header.name_size) { + printf("KVM stats name(%s) too long!\n", pdesc->name); + goto out_free_desc; + } + /* Check size field, which should not be zero */ + if (pdesc->size == 0) { + printf("KVM descriptor(%s) with size of 0!\n", + pdesc->name); + goto out_free_desc; + } + size_data = pdesc->size * sizeof(stats_data->value[0]); + } + /* Check overlap */ + if (header.data_offset < header.desc_offset && + header.data_offset + size_data > header.desc_offset) { + printf("Data block is overlapped with Descriptor block!\n"); + goto out_free_desc; + } + + /* Allocate memory for stats data */ + stats_data = malloc(size_data); + if (!stats_data) { + perror("Allocate memory for VCPU stats data"); + goto out_free_desc; + } + /* Read kvm vcpu stats data */ + ret = pread(stats_fd, stats_data, size_data, header.data_offset); + if (ret != size_data) { + perror("Read KVM VCPU stats data"); + goto out_free_data; + } + + err = 0; +out_free_data: + free(stats_data); +out_free_desc: + free(stats_desc); +out_close_fd: + close(stats_fd); + return err; +} + +/* + * Usage: kvm_bin_form_stats [#vm] [#vcpu] + * The first parameter #vm set the number of VMs being created. + * The second parameter #vcpu set the number of VCPUs being created. + * By default, 1 VM and 1 VCPU for the VM would be created for testing. + */ + +int main(int argc, char *argv[]) +{ + int max_vm = 1, max_vcpu = 1, ret, i, j, err = -1; + struct kvm_vm **vms; + + /* Get the number of VMs and VCPUs that would be created for testing. */ + if (argc > 1) { + max_vm = strtol(argv[1], NULL, 0); + if (max_vm <= 0) + max_vm = 1; + } + if (argc > 2 ) { + max_vcpu = strtol(argv[2], NULL, 0); + if (max_vcpu <= 0) + max_vcpu = 1; + } + + /* Check the extension for binary stats */ + ret = kvm_check_cap(KVM_CAP_STATS_BINARY_FD); + if (ret < 0) { + printf("Binary form statistics interface is not supported!\n"); + return err; + } + + /* Create VMs and VCPUs */ + vms = malloc(sizeof(vms[0]) * max_vm); + if (!vms) { + perror("Allocate memory for storing VM pointers"); + return err; + } + for (i = 0; i < max_vm; ++i) { + vms[i] = vm_create(VM_MODE_DEFAULT, + DEFAULT_GUEST_PHY_PAGES, O_RDWR); + for (j = 0; j < max_vcpu; ++j) { + vm_vcpu_add(vms[i], j); + } + } + + /* Check stats read for every VM and VCPU */ + for (i = 0; i < max_vm; ++i) { + if (vm_stats_test(vms[i])) + goto out_free_vm; + for (j = 0; j < max_vcpu; ++j) { + if (vcpu_stats_test(vms[i], j)) + goto out_free_vm; + } + } + + err = 0; +out_free_vm: + for (i = 0; i < max_vm; ++i) + kvm_vm_free(vms[i]); + free(vms); + return err; +} diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index 35247dba362e..bc2ad96b7a86 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -2015,3 +2015,14 @@ unsigned int vm_calc_num_guest_pages(enum vm_guest_mode mode, size_t size) n = DIV_ROUND_UP(size, vm_guest_mode_params[mode].page_size); return vm_adjust_num_guest_pages(mode, n); } + +int vm_get_statsfd(struct kvm_vm *vm) +{ + return ioctl(vm->fd, KVM_STATS_GETFD, NULL); +} + +int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid) +{ + struct vcpu *vcpu = vcpu_find(vm, vcpuid); + return ioctl(vcpu->fd, KVM_STATS_GETFD, NULL); +}