From: Manali Shukla Manali.Shukla@amd.com
The interface is used to read the data values of a specified vcpu stat from the currenly available binary stats interface.
Signed-off-by: Manali Shukla Manali.Shukla@amd.com --- .../selftests/kvm/include/kvm_util_base.h | 11 +++++ tools/testing/selftests/kvm/lib/kvm_util.c | 41 +++++++++++++++++++ 2 files changed, 52 insertions(+)
diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h index 9e5afc472c14..294bb42b6940 100644 --- a/tools/testing/selftests/kvm/include/kvm_util_base.h +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h @@ -512,6 +512,17 @@ void read_stat_data(int stats_fd, struct kvm_stats_header *header, struct kvm_stats_desc *desc, uint64_t *data, size_t max_elements);
+void __vcpu_get_stat(struct kvm_vcpu *vcpu, const char *stat_name, uint64_t *data, + size_t max_elements); + +static inline uint64_t vcpu_get_stat(struct kvm_vcpu *vcpu, const char *stat_name) +{ + uint64_t data; + + __vcpu_get_stat(vcpu, stat_name, &data, 1); + return data; +} + void __vm_get_stat(struct kvm_vm *vm, const char *stat_name, uint64_t *data, size_t max_elements);
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index e066d584c656..3d3a67ea0c7a 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -2166,6 +2166,47 @@ void read_stat_data(int stats_fd, struct kvm_stats_header *header, desc->name, size, ret); }
+/* + * Read the data of the named vcpu stat + * + * Input Args: + * vcpu - the vcpu for which the stat should be read + * stat_name - the name of the stat to read + * max_elements - the maximum number of 8-byte values to read into data + * + * Output Args: + * data - the buffer into which stat data should be read + * + * Read the data values of a specified stat from the binary stats interface. + */ +void __vcpu_get_stat(struct kvm_vcpu *vcpu, const char *stat_name, uint64_t *data, + size_t max_elements) +{ + int vcpu_stats_fd; + struct kvm_stats_header header; + struct kvm_stats_desc *desc, *t_desc; + size_t size_desc; + int i; + + vcpu_stats_fd = vcpu_get_stats_fd(vcpu); + read_stats_header(vcpu_stats_fd, &header); + + desc = read_stats_descriptors(vcpu_stats_fd, &header); + size_desc = get_stats_descriptor_size(&header); + + for (i = 0; i < header.num_desc; ++i) { + t_desc = (void *)desc + (i * size_desc); + + if (strcmp(t_desc->name, stat_name)) + continue; + + read_stat_data(vcpu_stats_fd, &header, t_desc, + data, max_elements); + + break; + } +} + /* * Read the data of the named stat *