352 lines
9.6 KiB
C
352 lines
9.6 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef CHANNEL_MANAGER_H_
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#define CHANNEL_MANAGER_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <linux/limits.h>
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#include <sys/un.h>
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#include <rte_atomic.h>
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/* Maximum number of CPUs */
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#define CHANNEL_CMDS_MAX_CPUS 64
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#if CHANNEL_CMDS_MAX_CPUS > 64
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#error Maximum number of cores is 64, overflow is guaranteed to \
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cause problems with VM Power Management
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#endif
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/* Maximum name length including '\0' terminator */
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#define CHANNEL_MGR_MAX_NAME_LEN 64
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/* Maximum number of channels to each Virtual Machine */
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#define CHANNEL_MGR_MAX_CHANNELS 64
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/* Hypervisor Path for libvirt(qemu/KVM) */
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#define CHANNEL_MGR_DEFAULT_HV_PATH "qemu:///system"
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/* File socket directory */
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#define CHANNEL_MGR_SOCKET_PATH "/tmp/powermonitor/"
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#ifndef UNIX_PATH_MAX
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struct sockaddr_un _sockaddr_un;
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#define UNIX_PATH_MAX sizeof(_sockaddr_un.sun_path)
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#endif
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#define MAX_VMS 4
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#define MAX_VCPUS 20
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struct libvirt_vm_info {
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const char *vm_name;
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unsigned int pcpus[MAX_VCPUS];
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uint8_t num_cpus;
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};
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struct libvirt_vm_info lvm_info[MAX_VMS];
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/* Communication Channel Status */
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enum channel_status { CHANNEL_MGR_CHANNEL_DISCONNECTED = 0,
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CHANNEL_MGR_CHANNEL_CONNECTED,
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CHANNEL_MGR_CHANNEL_DISABLED,
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CHANNEL_MGR_CHANNEL_PROCESSING};
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/* VM libvirt(qemu/KVM) connection status */
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enum vm_status { CHANNEL_MGR_VM_INACTIVE = 0, CHANNEL_MGR_VM_ACTIVE};
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/*
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* Represents a single and exclusive VM channel that exists between a guest and
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* the host.
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*/
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struct channel_info {
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char channel_path[UNIX_PATH_MAX]; /**< Path to host socket */
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volatile uint32_t status; /**< Connection status(enum channel_status) */
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int fd; /**< AF_UNIX socket fd */
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unsigned channel_num; /**< CHANNEL_MGR_SOCKET_PATH/<vm_name>.channel_num */
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void *priv_info; /**< Pointer to private info, do not modify */
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};
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/* Represents a single VM instance used to return internal information about
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* a VM */
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struct vm_info {
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char name[CHANNEL_MGR_MAX_NAME_LEN]; /**< VM name */
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enum vm_status status; /**< libvirt status */
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uint64_t pcpu_mask[CHANNEL_CMDS_MAX_CPUS]; /**< pCPU mask for each vCPU */
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unsigned num_vcpus; /**< number of vCPUS */
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struct channel_info channels[CHANNEL_MGR_MAX_CHANNELS]; /**< Array of channel_info */
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unsigned num_channels; /**< Number of channels */
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};
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/**
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* Initialize the Channel Manager resources and connect to the Hypervisor
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* specified in path.
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* This must be successfully called first before calling any other functions.
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* It must only be call once;
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*
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* @param path
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* Must be a local path, e.g. qemu:///system.
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*
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* @return
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* - 0 on success.
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* - Negative on error.
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*/
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int channel_manager_init(const char *path);
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/**
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* Free resources associated with the Channel Manager.
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*
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* @param path
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* Must be a local path, e.g. qemu:///system.
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*
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* @return
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* None
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*/
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void channel_manager_exit(void);
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/**
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* Get the Physical CPU mask for VM lcore channel(vcpu), result is assigned to
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* core_mask.
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* It is not thread-safe.
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*
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* @param chan_info
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* Pointer to struct channel_info
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*
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* @param vcpu
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* The virtual CPU to query.
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*
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*
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* @return
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* - 0 on error.
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* - >0 on success.
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*/
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uint64_t get_pcpus_mask(struct channel_info *chan_info, unsigned vcpu);
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/**
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* Set the Physical CPU mask for the specified vCPU.
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* It is not thread-safe.
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*
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* @param name
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* Virtual Machine name to lookup
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*
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* @param vcpu
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* The virtual CPU to set.
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*
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* @param core_mask
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* The core mask of the physical CPU(s) to bind the vCPU
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*
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* @return
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* - 0 on success.
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* - Negative on error.
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*/
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int set_pcpus_mask(char *vm_name, unsigned vcpu, uint64_t core_mask);
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/**
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* Set the Physical CPU for the specified vCPU.
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* It is not thread-safe.
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*
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* @param name
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* Virtual Machine name to lookup
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*
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* @param vcpu
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* The virtual CPU to set.
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*
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* @param core_num
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* The core number of the physical CPU(s) to bind the vCPU
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*
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* @return
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* - 0 on success.
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* - Negative on error.
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*/
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int set_pcpu(char *vm_name, unsigned vcpu, unsigned core_num);
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/**
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* Add a VM as specified by name to the Channel Manager. The name must
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* correspond to a valid libvirt domain name.
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* This is required prior to adding channels.
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* It is not thread-safe.
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*
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* @param name
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* Virtual Machine name to lookup.
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*
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* @return
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* - 0 on success.
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* - Negative on error.
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*/
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int add_vm(const char *name);
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/**
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* Remove a previously added Virtual Machine from the Channel Manager
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* It is not thread-safe.
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*
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* @param name
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* Virtual Machine name to lookup.
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*
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* @return
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* - 0 on success.
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* - Negative on error.
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*/
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int remove_vm(const char *name);
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/**
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* Add all available channels to the VM as specified by name.
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* Channels in the form of paths
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* (CHANNEL_MGR_SOCKET_PATH/<vm_name>.<channel_number>) will only be parsed.
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* It is not thread-safe.
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*
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* @param name
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* Virtual Machine name to lookup.
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*
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* @return
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* - N the number of channels added for the VM
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*/
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int add_all_channels(const char *vm_name);
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/**
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* Add the channel numbers in channel_list to the domain specified by name.
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* Channels in the form of paths
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* (CHANNEL_MGR_SOCKET_PATH/<vm_name>.<channel_number>) will only be parsed.
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* It is not thread-safe.
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*
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* @param name
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* Virtual Machine name to add channels.
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*
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* @param channel_list
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* Pointer to list of unsigned integers, representing the channel number to add
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* It must be allocated outside of this function.
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*
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* @param num_channels
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* The amount of channel numbers in channel_list
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*
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* @return
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* - N the number of channels added for the VM
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* - 0 for error
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*/
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int add_channels(const char *vm_name, unsigned *channel_list,
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unsigned num_channels);
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/**
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* Remove a channel definition from the channel manager. This must only be
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* called from the channel monitor thread.
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*
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* @param chan_info
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* Pointer to a valid struct channel_info.
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*
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* @return
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* - 0 on success.
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* - Negative on error.
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*/
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int remove_channel(struct channel_info **chan_info_dptr);
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/**
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* For all channels associated with a Virtual Machine name, update the
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* connection status. Valid states are CHANNEL_MGR_CHANNEL_CONNECTED or
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* CHANNEL_MGR_CHANNEL_DISABLED only.
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*
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*
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* @param name
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* Virtual Machine name to modify all channels.
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*
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* @param status
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* The status to set each channel
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*
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* @param num_channels
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* The amount of channel numbers in channel_list
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*
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* @return
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* - N the number of channels added for the VM
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* - 0 for error
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*/
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int set_channel_status_all(const char *name, enum channel_status status);
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/**
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* For all channels in channel_list associated with a Virtual Machine name
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* update the connection status of each.
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* Valid states are CHANNEL_MGR_CHANNEL_CONNECTED or
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* CHANNEL_MGR_CHANNEL_DISABLED only.
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* It is not thread-safe.
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*
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* @param name
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* Virtual Machine name to add channels.
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*
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* @param channel_list
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* Pointer to list of unsigned integers, representing the channel numbers to
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* modify.
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* It must be allocated outside of this function.
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*
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* @param num_channels
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* The amount of channel numbers in channel_list
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*
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* @return
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* - N the number of channels modified for the VM
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* - 0 for error
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*/
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int set_channel_status(const char *vm_name, unsigned *channel_list,
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unsigned len_channel_list, enum channel_status status);
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/**
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* Populates a pointer to struct vm_info associated with vm_name.
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*
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* @param vm_name
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* The name of the virtual machine to lookup.
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*
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* @param vm_info
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* Pointer to a struct vm_info, this must be allocated prior to calling this
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* function.
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*
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* @return
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* - 0 on success.
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* - Negative on error.
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*/
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int get_info_vm(const char *vm_name, struct vm_info *info);
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/**
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* Populates a table with all domains running and their physical cpu.
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* All information is gathered through libvirt api.
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*
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* @param num_vm
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* modified to store number of active VMs
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*
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* @param num_vcpu
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modified to store number of vcpus active
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*
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* @return
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* void
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*/
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void get_all_vm(int *num_vm, int *num_vcpu);
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#ifdef __cplusplus
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}
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#endif
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#endif /* CHANNEL_MANAGER_H_ */
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