1 #include <kvm/util.h> 2 #include <kvm/kvm-cmd.h> 3 #include <kvm/builtin-debug.h> 4 #include <kvm/kvm.h> 5 #include <kvm/parse-options.h> 6 #include <kvm/kvm-ipc.h> 7 #include <kvm/read-write.h> 8 9 #include <stdio.h> 10 #include <string.h> 11 #include <signal.h> 12 13 #define BUFFER_SIZE 100 14 15 static bool all; 16 static int instance; 17 static int nmi = -1; 18 static bool dump; 19 static const char *instance_name; 20 21 static const char * const debug_usage[] = { 22 "kvm debug [--all] [-n name] [-d] [-m vcpu]", 23 NULL 24 }; 25 26 static const struct option debug_options[] = { 27 OPT_GROUP("General options:"), 28 OPT_BOOLEAN('d', "dump", &dump, "Generate a debug dump from guest"), 29 OPT_INTEGER('m', "nmi", &nmi, "Generate NMI on VCPU"), 30 OPT_GROUP("Instance options:"), 31 OPT_BOOLEAN('a', "all", &all, "Debug all instances"), 32 OPT_STRING('n', "name", &instance_name, "name", "Instance name"), 33 OPT_END() 34 }; 35 36 static void parse_debug_options(int argc, const char **argv) 37 { 38 while (argc != 0) { 39 argc = parse_options(argc, argv, debug_options, debug_usage, 40 PARSE_OPT_STOP_AT_NON_OPTION); 41 if (argc != 0) 42 kvm_debug_help(); 43 } 44 } 45 46 void kvm_debug_help(void) 47 { 48 usage_with_options(debug_usage, debug_options); 49 } 50 51 static int do_debug(const char *name, int sock) 52 { 53 char buff[BUFFER_SIZE]; 54 struct debug_cmd cmd = {KVM_IPC_DEBUG, 2 * sizeof(u32)}; 55 int r; 56 57 if (dump) 58 cmd.params.dbg_type |= KVM_DEBUG_CMD_TYPE_DUMP; 59 60 if (nmi != -1) { 61 cmd.params.dbg_type |= KVM_DEBUG_CMD_TYPE_NMI; 62 cmd.params.cpu = nmi; 63 } 64 65 r = xwrite(sock, &cmd, sizeof(cmd)); 66 if (r < 0) 67 return r; 68 69 if (!dump) 70 return 0; 71 72 do { 73 r = xread(sock, buff, BUFFER_SIZE); 74 if (r < 0) 75 return 0; 76 printf("%.*s", r, buff); 77 } while (r > 0); 78 79 return 0; 80 } 81 82 int kvm_cmd_debug(int argc, const char **argv, const char *prefix) 83 { 84 parse_debug_options(argc, argv); 85 86 if (all) 87 return kvm__enumerate_instances(do_debug); 88 89 if (instance_name == NULL && 90 instance == 0) 91 kvm_debug_help(); 92 93 if (instance_name) 94 instance = kvm__get_sock_by_instance(instance_name); 95 96 if (instance <= 0) 97 die("Failed locating instance"); 98 99 return do_debug(instance_name, instance); 100 } 101