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