1 #include <stdio.h> 2 #include <string.h> 3 #include <signal.h> 4 5 #include <kvm/util.h> 6 #include <kvm/kvm-cmd.h> 7 #include <kvm/builtin-balloon.h> 8 #include <kvm/parse-options.h> 9 #include <kvm/kvm.h> 10 #include <kvm/kvm-ipc.h> 11 12 static const char *instance_name; 13 static u64 inflate; 14 static u64 deflate; 15 16 struct balloon_cmd { 17 u32 type; 18 u32 len; 19 int amount; 20 }; 21 22 static const char * const balloon_usage[] = { 23 "lkvm balloon [-n name] [-p pid] [-i amount] [-d amount]", 24 NULL 25 }; 26 27 static const struct option balloon_options[] = { 28 OPT_GROUP("Instance options:"), 29 OPT_STRING('n', "name", &instance_name, "name", "Instance name"), 30 OPT_GROUP("Balloon options:"), 31 OPT_U64('i', "inflate", &inflate, "Amount to inflate"), 32 OPT_U64('d', "deflate", &deflate, "Amount to deflate"), 33 OPT_END(), 34 }; 35 36 void kvm_balloon_help(void) 37 { 38 usage_with_options(balloon_usage, balloon_options); 39 } 40 41 static void parse_balloon_options(int argc, const char **argv) 42 { 43 while (argc != 0) { 44 argc = parse_options(argc, argv, balloon_options, balloon_usage, 45 PARSE_OPT_STOP_AT_NON_OPTION); 46 if (argc != 0) 47 kvm_balloon_help(); 48 } 49 } 50 51 int kvm_cmd_balloon(int argc, const char **argv, const char *prefix) 52 { 53 struct balloon_cmd cmd; 54 int instance; 55 int r; 56 57 parse_balloon_options(argc, argv); 58 59 if (inflate == 0 && deflate == 0) 60 kvm_balloon_help(); 61 62 if (instance_name == NULL) 63 kvm_balloon_help(); 64 65 instance = kvm__get_sock_by_instance(instance_name); 66 67 if (instance <= 0) 68 die("Failed locating instance"); 69 70 cmd.type = KVM_IPC_BALLOON; 71 cmd.len = sizeof(cmd.amount); 72 73 if (inflate) 74 cmd.amount = inflate; 75 else if (deflate) 76 cmd.amount = -deflate; 77 else 78 kvm_balloon_help(); 79 80 r = write(instance, &cmd, sizeof(cmd)); 81 82 close(instance); 83 84 if (r < 0) 85 return -1; 86 87 return 0; 88 } 89