From: Manali Shukla <Manali.Shukla@xxxxxxx>
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@xxxxxxx>
---
.../testing/selftests/kvm/include/kvm_util.h | 66 +++++++++++++++++++
tools/testing/selftests/kvm/lib/kvm_util.c | 32 +++++++++
2 files changed, 98 insertions(+)
diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
index 63c2aaae51f3..7dad3275a4d3 100644
--- a/tools/testing/selftests/kvm/include/kvm_util.h
+++ b/tools/testing/selftests/kvm/include/kvm_util.h
@@ -518,6 +518,72 @@ static inline uint64_t vm_get_stat(struct kvm_vm *vm, const char *stat_name)
return data;
}
+/*
+ * Ensure that the sequence of the enum vcpu_stat_types matches the order of
+ * kvm_vcpu_stats_desc[]. Otherwise, vcpu_get_stat() may return incorrect data
+ * because __vcpu_get_stat() uses the enum type as an index to get the
+ * descriptor for a given stat and then uses read_stat_data() to get the stats
+ * from the descriptor.
+ */
+enum vcpu_stat_types {
+ HALT_SUCCESSFUL_POLL,
+ HALT_ATTEMPTED_POLL,
+ HALT_POLL_INVALID,
+ HALT_WAKEUP,
+ HALT_POLL_SUCCESS_NS,
+ HALT_POLL_FAIL_NS,
+ HALT_WAIT_NS,
+ HALT_POLL_SUCCESS_HIST,
+ HALT_POLL_FAIL_HIST,
+ HALT_WAIT_HIST,
+ BLOCKING,
+ PF_TAKEN,
+ PF_FIXED,
+ PF_EMULATE,
+ PF_SPURIOUS,
+ PF_FAST,
+ PF_MMIO_SPTE_CREATED,
+ PF_GUEST,
+ TLB_FLUSH,
+ INVLPG,
+ EXITS,
+ IO_EXITS,
+ MMIO_EXITS,
+ SIGNAL_EXITS,
+ IRQ_WINDOW_EXITS,
+ NMI_WINDOW_EXITS,
+ LD_FLUSH,
+ HALT_EXITS,
+ REQUEST_IRQ_EXITS,
+ IRQ_EXITS,
+ HOST_STATE_RELOAD,
+ FPU_RELOAD,
+ INSN_EMULATION,
+ INSN_EMULATION_FAIL,
+ HYPERCALLS,
+ IRQ_INJECTIONS,
+ NMI_INJECTIONS,
+ REQ_EVENT,
+ NESTED_RUN,
+ DIRECTED_YIELD_ATTEMPTED,
+ DIRECTED_YIELD_SUCCESSFUL,
+ PREEMPTION_REPORTED,
+ PREEMPTION_OTHER,
+ GUEST_MODE,
+ NOTIFY_WINDOW_EXITS,
+};
+
+void __vcpu_get_stat(struct kvm_vcpu *vcpu, enum vcpu_stat_types type, uint64_t *data,
+ size_t max_elements);
+
+static inline uint64_t vcpu_get_stat(struct kvm_vcpu *vcpu, enum vcpu_stat_types type)
+{
+ uint64_t data;
+
+ __vcpu_get_stat(vcpu, type, &data, 1);
+ return data;
+}
+
void vm_create_irqchip(struct kvm_vm *vm);
static inline int __vm_create_guest_memfd(struct kvm_vm *vm, uint64_t size,
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 6b2158655baa..3de292ca9280 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -2256,6 +2256,38 @@ 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, enum vcpu_stat_types type, 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;
+
+ 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);
+
+ t_desc = (void *)desc + (type * size_desc);
+ read_stat_data(vcpu_stats_fd, &header, t_desc,
+ data, max_elements);
+}
+
/*
* Read the data of the named stat
*
--
2.34.1
