[dpdk-dev] [PATCH v7 3/9] examples/vm_power_mgr: add vcpu to pcpu mapping

David Hunt david.hunt at intel.com
Thu Oct 5 15:28:14 CEST 2017


Signed-off-by: Nemanja Marjanovic <nemanja.marjanovic at intel.com>
Signed-off-by: Rory Sexton <rory.sexton at intel.com>
Signed-off-by: David Hunt <david.hunt at intel.com>
---
 examples/vm_power_manager/channel_manager.c | 67 +++++++++++++++++++++++++++++
 examples/vm_power_manager/channel_manager.h | 25 +++++++++++
 2 files changed, 92 insertions(+)

diff --git a/examples/vm_power_manager/channel_manager.c b/examples/vm_power_manager/channel_manager.c
index e068ae2..ab856bd 100644
--- a/examples/vm_power_manager/channel_manager.c
+++ b/examples/vm_power_manager/channel_manager.c
@@ -574,6 +574,73 @@ set_channel_status(const char *vm_name, unsigned *channel_list,
 	return num_channels_changed;
 }
 
+void
+get_all_vm(int *num_vm, int *num_vcpu)
+{
+
+	virNodeInfo node_info;
+	virDomainPtr *domptr;
+	uint64_t mask;
+	int i, ii, numVcpus[MAX_VCPUS], cpu, n_vcpus;
+	unsigned int jj;
+	const char *vm_name;
+	unsigned int domain_flags = VIR_CONNECT_LIST_DOMAINS_RUNNING |
+				VIR_CONNECT_LIST_DOMAINS_PERSISTENT;
+	unsigned int domain_flag = VIR_DOMAIN_VCPU_CONFIG;
+
+
+	memset(global_cpumaps, 0, CHANNEL_CMDS_MAX_CPUS*global_maplen);
+	if (virNodeGetInfo(global_vir_conn_ptr, &node_info)) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to retrieve node Info\n");
+		return;
+	}
+
+	/* Returns number of pcpus */
+	global_n_host_cpus = (unsigned int)node_info.cpus;
+
+	/* Returns number of active domains */
+	*num_vm = virConnectListAllDomains(global_vir_conn_ptr, &domptr,
+					domain_flags);
+	if (*num_vm <= 0) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "No Active Domains Running\n");
+		return;
+	}
+
+	for (i = 0; i < *num_vm; i++) {
+
+		/* Get Domain Names */
+		vm_name = virDomainGetName(domptr[i]);
+		lvm_info[i].vm_name = vm_name;
+
+		/* Get Number of Vcpus */
+		numVcpus[i] = virDomainGetVcpusFlags(domptr[i], domain_flag);
+
+		/* Get Number of VCpus & VcpuPinInfo */
+		n_vcpus = virDomainGetVcpuPinInfo(domptr[i],
+				numVcpus[i], global_cpumaps,
+				global_maplen, domain_flag);
+
+		if ((int)n_vcpus > 0) {
+			*num_vcpu = n_vcpus;
+			lvm_info[i].num_cpus = n_vcpus;
+		}
+
+		/* Save pcpu in use by libvirt VMs */
+		for (ii = 0; ii < n_vcpus; ii++) {
+			mask = 0;
+			for (jj = 0; jj < global_n_host_cpus; jj++) {
+				if (VIR_CPU_USABLE(global_cpumaps,
+						global_maplen, ii, jj) > 0) {
+					mask |= 1ULL << jj;
+				}
+			}
+			ITERATIVE_BITMASK_CHECK_64(mask, cpu) {
+				lvm_info[i].pcpus[ii] = cpu;
+			}
+		}
+	}
+}
+
 int
 get_info_vm(const char *vm_name, struct vm_info *info)
 {
diff --git a/examples/vm_power_manager/channel_manager.h b/examples/vm_power_manager/channel_manager.h
index 47c3b9c..358fb8f 100644
--- a/examples/vm_power_manager/channel_manager.h
+++ b/examples/vm_power_manager/channel_manager.h
@@ -66,6 +66,17 @@ struct sockaddr_un _sockaddr_un;
 #define UNIX_PATH_MAX sizeof(_sockaddr_un.sun_path)
 #endif
 
+#define MAX_VMS 4
+#define MAX_VCPUS 20
+
+
+struct libvirt_vm_info {
+	const char *vm_name;
+	unsigned int pcpus[MAX_VCPUS];
+	uint8_t num_cpus;
+};
+
+struct libvirt_vm_info lvm_info[MAX_VMS];
 /* Communication Channel Status */
 enum channel_status { CHANNEL_MGR_CHANNEL_DISCONNECTED = 0,
 	CHANNEL_MGR_CHANNEL_CONNECTED,
@@ -319,6 +330,20 @@ int set_channel_status(const char *vm_name, unsigned *channel_list,
  */
 int get_info_vm(const char *vm_name, struct vm_info *info);
 
+/**
+ * Populates a table with all domains running and their physical cpu.
+ * All information is gathered through libvirt api.
+ *
+ * @param num_vm
+ *  modified to store number of active VMs
+ *
+ * @param num_vcpu
+    modified to store number of vcpus active
+ *
+ * @return
+ *   void
+ */
+void get_all_vm(int *num_vm, int *num_vcpu);
 #ifdef __cplusplus
 }
 #endif
-- 
2.7.4



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