* --help/--version improvements (Eric)

* GCC 7 workaround (Greg)
 * Small SCSI fix (Hannes)
 * SSE 4.1 fix (Joseph)
 * RCU deadlock fix (myself)
 -----BEGIN PGP SIGNATURE-----
 
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 QHJlZGhhdC5jb20ACgkQv/vSX3jHroPMLgf/Zvj+1yP94YejCWma5jay8/kbWqNx
 25AVurgleLsuhFATpZixyURauVkyGi1RCCldq0EZR2bXMDmwTk76VTt2Kh7/xh5I
 GZIT44tRKwItpihfN600xGHFH00C9pu4dg5zSZvj1nuwlowEgmx7hni2uG4DdKaM
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 7LLXp1Ujngfdfcq4b4pLaFAkFkGOjHwXEtgEi/Z+mphXfORlf7haOphdOA==
 =v1PK
 -----END PGP SIGNATURE-----

Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into staging

* --help/--version improvements (Eric)
* GCC 7 workaround (Greg)
* Small SCSI fix (Hannes)
* SSE 4.1 fix (Joseph)
* RCU deadlock fix (myself)

# gpg: Signature made Tue 08 Aug 2017 16:28:56 BST
# gpg:                using RSA key 0xBFFBD25F78C7AE83
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>"
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>"
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4  E2F7 7E15 100C CD36 69B1
#      Subkey fingerprint: F133 3857 4B66 2389 866C  7682 BFFB D25F 78C7 AE83

* remotes/bonzini/tags/for-upstream:
  maint: Include bug-reporting info in --help output
  qga: Give more --version information
  qemu-io: Give more --version information
  qemu-img: Sort sub-command names in --help
  target/i386: set rip_offset for some SSE4.1 instructions
  scsi: clarify sense codes for LUN0 emulation
  kvm: workaround build break on gcc-7.1.1 / fedora26
  Revert "rcu: do not create thread in pthread_atfork callback"
  rcu: completely disable pthread_atfork callbacks as soon as possible

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

bsd-user/main.c

@@ -686,6 +686,8 @@ static void usage(void)
            "    -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
            "Note that if you provide several changes to single variable\n"
            "last change will stay in effect.\n"
+           "\n"
+           QEMU_HELP_BOTTOM "\n"
            ,
            TARGET_NAME,
            interp_prefix,

hw/scsi/scsi-bus.c

@@ -517,6 +517,11 @@ static int32_t scsi_target_send_command(SCSIRequest *req, uint8_t *buf)
 {
     SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req);
 
+    if (req->lun != 0) {
+        scsi_req_build_sense(req, SENSE_CODE(LUN_NOT_SUPPORTED));
+        scsi_req_complete(req, CHECK_CONDITION);
+        return 0;
+    }
     switch (buf[0]) {
     case REPORT_LUNS:
         if (!scsi_target_emulate_report_luns(r)) {
@@ -542,7 +547,7 @@ static int32_t scsi_target_send_command(SCSIRequest *req, uint8_t *buf)
     case TEST_UNIT_READY:
         break;
     default:
-        scsi_req_build_sense(req, SENSE_CODE(LUN_NOT_SUPPORTED));
+        scsi_req_build_sense(req, SENSE_CODE(INVALID_OPCODE));
         scsi_req_complete(req, CHECK_CONDITION);
         return 0;
     illegal_request:

include/qemu-common.h

@@ -22,6 +22,11 @@
 #define QEMU_COPYRIGHT "Copyright (c) 2003-2017 " \
     "Fabrice Bellard and the QEMU Project developers"
 
+/* Bug reporting information for --help arguments, About dialogs, etc */
+#define QEMU_HELP_BOTTOM \
+    "See <http://qemu.org/contribute/report-a-bug> for how to report bugs.\n" \
+    "More information on the QEMU project at <http://qemu.org>."
+
 /* main function, renamed */
 #if defined(CONFIG_COCOA)
 int qemu_main(int argc, char **argv, char **envp);

include/qemu/rcu.h

@@ -105,7 +105,12 @@ extern void synchronize_rcu(void);
  */
 extern void rcu_register_thread(void);
 extern void rcu_unregister_thread(void);
-extern void rcu_after_fork(void);
+
+/*
+ * Support for fork().  fork() support is enabled at startup.
+ */
+extern void rcu_enable_atfork(void);
+extern void rcu_disable_atfork(void);
 
 struct rcu_head;
 typedef void RCUCBFunc(struct rcu_head *head);

include/sysemu/kvm.h

@@ -428,11 +428,8 @@ int kvm_vm_check_extension(KVMState *s, unsigned int extension);
             .flags = cap_flags,                                      \
         };                                                           \
         uint64_t args_tmp[] = { __VA_ARGS__ };                       \
-        int i;                                                       \
+        size_t n = MIN(ARRAY_SIZE(args_tmp), ARRAY_SIZE(cap.args));  \
-        for (i = 0; i < (int)ARRAY_SIZE(args_tmp) &&                 \
+        memcpy(cap.args, args_tmp, n * sizeof(cap.args[0]));         \
-                     i < ARRAY_SIZE(cap.args); i++) {                \
-            cap.args[i] = args_tmp[i];                               \
-        }                                                            \
         kvm_vm_ioctl(s, KVM_ENABLE_CAP, &cap);                       \
     })
 
@@ -443,11 +440,8 @@ int kvm_vm_check_extension(KVMState *s, unsigned int extension);
             .flags = cap_flags,                                      \
         };                                                           \
         uint64_t args_tmp[] = { __VA_ARGS__ };                       \
-        int i;                                                       \
+        size_t n = MIN(ARRAY_SIZE(args_tmp), ARRAY_SIZE(cap.args));  \
-        for (i = 0; i < (int)ARRAY_SIZE(args_tmp) &&                 \
+        memcpy(cap.args, args_tmp, n * sizeof(cap.args[0]));         \
-                     i < ARRAY_SIZE(cap.args); i++) {                \
-            cap.args[i] = args_tmp[i];                               \
-        }                                                            \
         kvm_vcpu_ioctl(cpu, KVM_ENABLE_CAP, &cap);                   \
     })
 

linux-user/main.c

@@ -4136,7 +4136,9 @@ static void usage(int exitcode)
            "    -E var1=val2,var2=val2 -U LD_PRELOAD,LD_DEBUG\n"
            "    QEMU_SET_ENV=var1=val2,var2=val2 QEMU_UNSET_ENV=LD_PRELOAD,LD_DEBUG\n"
            "Note that if you provide several changes to a single variable\n"
-           "the last change will stay in effect.\n");
+           "the last change will stay in effect.\n"
+           "\n"
+           QEMU_HELP_BOTTOM "\n");
 
     exit(exitcode);
 }

linux-user/syscall.c

@@ -6354,7 +6354,6 @@ static int do_fork(CPUArchState *env, unsigned int flags, abi_ulong newsp,
         ret = fork();
         if (ret == 0) {
             /* Child Process.  */
-            rcu_after_fork();
             cpu_clone_regs(env, newsp);
             fork_end(1);
             /* There is a race condition here.  The parent process could

os-posix.c

@@ -34,7 +34,6 @@
 #include "sysemu/sysemu.h"
 #include "net/slirp.h"
 #include "qemu-options.h"
-#include "qemu/rcu.h"
 #include "qemu/error-report.h"
 #include "qemu/log.h"
 #include "qemu/cutils.h"
@@ -249,7 +248,6 @@ void os_daemonize(void)
         signal(SIGTSTP, SIG_IGN);
         signal(SIGTTOU, SIG_IGN);
         signal(SIGTTIN, SIG_IGN);
-        rcu_after_fork();
     }
 }
 

qemu-img-cmds.hx

@@ -1,3 +1,4 @@
+HXCOMM Keep the list of subcommands sorted by name.
 HXCOMM Use DEFHEADING() to define headings in both help text and texi
 HXCOMM Text between STEXI and ETEXI are copied to texi version and
 HXCOMM discarded from C version
@@ -9,6 +10,12 @@ STEXI
 @table @option
 ETEXI
 
+DEF("amend", img_amend,
+    "amend [--object objectdef] [--image-opts] [-p] [-q] [-f fmt] [-t cache] -o options filename")
+STEXI
+@item amend [--object @var{objectdef}] [--image-opts] [-p] [-q] [-f @var{fmt}] [-t @var{cache}] -o @var{options} @var{filename}
+ETEXI
+
 DEF("bench", img_bench,
     "bench [-c count] [-d depth] [-f fmt] [--flush-interval=flush_interval] [-n] [--no-drain] [-o offset] [--pattern=pattern] [-q] [-s buffer_size] [-S step_size] [-t cache] [-w] [-U] filename")
 STEXI
@@ -21,12 +28,6 @@ STEXI
 @item check [--object @var{objectdef}] [--image-opts] [-q] [-f @var{fmt}] [--output=@var{ofmt}] [-r [leaks | all]] [-T @var{src_cache}] [-U] @var{filename}
 ETEXI
 
-DEF("create", img_create,
-    "create [-q] [--object objectdef] [-f fmt] [-b backing_file] [-F backing_fmt] [-u] [-o options] filename [size]")
-STEXI
-@item create [--object @var{objectdef}] [-q] [-f @var{fmt}] [-b @var{backing_file}] [-F @var{backing_fmt}] [-u] [-o @var{options}] @var{filename} [@var{size}]
-ETEXI
-
 DEF("commit", img_commit,
     "commit [-q] [--object objectdef] [--image-opts] [-f fmt] [-t cache] [-b base] [-d] [-p] filename")
 STEXI
@@ -45,6 +46,12 @@ STEXI
 @item convert [--object @var{objectdef}] [--image-opts] [--target-image-opts] [-U] [-c] [-p] [-q] [-n] [-f @var{fmt}] [-t @var{cache}] [-T @var{src_cache}] [-O @var{output_fmt}] [-B @var{backing_file}] [-o @var{options}] [-s @var{snapshot_id_or_name}] [-l @var{snapshot_param}] [-S @var{sparse_size}] [-m @var{num_coroutines}] [-W] @var{filename} [@var{filename2} [...]] @var{output_filename}
 ETEXI
 
+DEF("create", img_create,
+    "create [-q] [--object objectdef] [-f fmt] [-b backing_file] [-F backing_fmt] [-u] [-o options] filename [size]")
+STEXI
+@item create [--object @var{objectdef}] [-q] [-f @var{fmt}] [-b @var{backing_file}] [-F @var{backing_fmt}] [-u] [-o @var{options}] @var{filename} [@var{size}]
+ETEXI
+
 DEF("dd", img_dd,
     "dd [--image-opts] [-U] [-f fmt] [-O output_fmt] [bs=block_size] [count=blocks] [skip=blocks] if=input of=output")
 STEXI
@@ -87,9 +94,6 @@ STEXI
 @item resize [--object @var{objectdef}] [--image-opts] [-q] @var{filename} [+ | -]@var{size}
 ETEXI
 
-DEF("amend", img_amend,
-    "amend [--object objectdef] [--image-opts] [-p] [-q] [-f fmt] [-t cache] -o options filename")
 STEXI
-@item amend [--object @var{objectdef}] [--image-opts] [-p] [-q] [-f @var{fmt}] [-t @var{cache}] -o @var{options} @var{filename}
 @end table
 ETEXI

qemu-img.c

@@ -201,7 +201,7 @@ static void QEMU_NORETURN help(void)
 
     printf("%s\nSupported formats:", help_msg);
     bdrv_iterate_format(format_print, NULL);
-    printf("\n");
+    printf("\n\n" QEMU_HELP_BOTTOM "\n");
     exit(EXIT_SUCCESS);
 }
 

qemu-io.c

@@ -26,6 +26,7 @@
 #include "block/block_int.h"
 #include "trace/control.h"
 #include "crypto/init.h"
+#include "qemu-version.h"
 
 #define CMD_NOFILE_OK   0x01
 
@@ -261,8 +262,9 @@ static void usage(const char *name)
 "  -h, --help           display this help and exit\n"
 "  -V, --version        output version information and exit\n"
 "\n"
-"See '%s -c help' for information on available commands."
+"See '%s -c help' for information on available commands.\n"
-"\n",
+"\n"
+QEMU_HELP_BOTTOM "\n",
     name, name);
 }
 
@@ -522,7 +524,8 @@ int main(int argc, char **argv)
             trace_file = trace_opt_parse(optarg);
             break;
         case 'V':
-            printf("%s version %s\n", progname, QEMU_VERSION);
+            printf("%s version " QEMU_VERSION QEMU_PKGVERSION "\n"
+                   QEMU_COPYRIGHT "\n", progname);
             exit(0);
         case 'h':
             usage(progname);

qemu-nbd.c

@@ -123,7 +123,7 @@ static void usage(const char *name)
 "      --detect-zeroes=MODE  set detect-zeroes mode (off, on, unmap)\n"
 "      --image-opts          treat FILE as a full set of image options\n"
 "\n"
-"Report bugs to <qemu-devel@nongnu.org>\n"
+QEMU_HELP_BOTTOM "\n"
     , name, NBD_DEFAULT_PORT, "DEVICE");
 }
 

qga/main.c

@@ -29,6 +29,7 @@
 #include "qemu/help_option.h"
 #include "qemu/sockets.h"
 #include "qemu/systemd.h"
+#include "qemu-version.h"
 #ifdef _WIN32
 #include "qga/service-win32.h"
 #include "qga/vss-win32.h"
@@ -213,7 +214,8 @@ static void usage(const char *cmd)
 {
     printf(
 "Usage: %s [-m <method> -p <path>] [<options>]\n"
-"QEMU Guest Agent %s\n"
+"QEMU Guest Agent " QEMU_VERSION QEMU_PKGVERSION "\n"
+QEMU_COPYRIGHT "\n"
 "\n"
 "  -m, --method      transport method: one of unix-listen, virtio-serial,\n"
 "                    isa-serial, or vsock-listen (virtio-serial is the default)\n"
@@ -247,8 +249,8 @@ static void usage(const char *cmd)
 "                    options / command-line parameters to stdout\n"
 "  -h, --help        display this help and exit\n"
 "\n"
-"Report bugs to <mdroth@linux.vnet.ibm.com>\n"
+QEMU_HELP_BOTTOM "\n"
-    , cmd, QEMU_VERSION, QGA_VIRTIO_PATH_DEFAULT, QGA_SERIAL_PATH_DEFAULT,
+    , cmd, QGA_VIRTIO_PATH_DEFAULT, QGA_SERIAL_PATH_DEFAULT,
     dfl_pathnames.pidfile,
 #ifdef CONFIG_FSFREEZE
     QGA_FSFREEZE_HOOK_DEFAULT,

target/i386/translate.c

@@ -4080,6 +4080,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
             if (sse_fn_eppi == SSE_SPECIAL) {
                 ot = mo_64_32(s->dflag);
                 rm = (modrm & 7) | REX_B(s);
+                s->rip_offset = 1;
                 if (mod != 3)
                     gen_lea_modrm(env, s, modrm);
                 reg = ((modrm >> 3) & 7) | rex_r;

util/rcu.c

@@ -318,30 +318,54 @@ static void rcu_init_complete(void)
     rcu_register_thread();
 }
 
+static int atfork_depth = 1;
+
+void rcu_enable_atfork(void)
+{
+    atfork_depth++;
+}
+
+void rcu_disable_atfork(void)
+{
+    atfork_depth--;
+}
+
 #ifdef CONFIG_POSIX
 static void rcu_init_lock(void)
 {
+    if (atfork_depth < 1) {
+        return;
+    }
+
     qemu_mutex_lock(&rcu_sync_lock);
     qemu_mutex_lock(&rcu_registry_lock);
 }
 
 static void rcu_init_unlock(void)
 {
+    if (atfork_depth < 1) {
+        return;
+    }
+
     qemu_mutex_unlock(&rcu_registry_lock);
     qemu_mutex_unlock(&rcu_sync_lock);
 }
-#endif
 
-void rcu_after_fork(void)
+static void rcu_init_child(void)
 {
+    if (atfork_depth < 1) {
+        return;
+    }
+
     memset(&registry, 0, sizeof(registry));
     rcu_init_complete();
 }
+#endif
 
 static void __attribute__((__constructor__)) rcu_init(void)
 {
 #ifdef CONFIG_POSIX
-    pthread_atfork(rcu_init_lock, rcu_init_unlock, rcu_init_unlock);
+    pthread_atfork(rcu_init_lock, rcu_init_unlock, rcu_init_child);
 #endif
     rcu_init_complete();
 }

vl.c

@@ -1942,7 +1942,9 @@ static void help(int exitcode)
            "ctrl-alt-n      switch to virtual console 'n'\n"
            "ctrl-alt        toggle mouse and keyboard grab\n"
            "\n"
-           "When using -nographic, press 'ctrl-a h' to get some help.\n");
+           "When using -nographic, press 'ctrl-a h' to get some help.\n"
+           "\n"
+           QEMU_HELP_BOTTOM "\n");
 
     exit(exitcode);
 }
@@ -4121,6 +4123,7 @@ int main(int argc, char **argv, char **envp)
     set_memory_options(&ram_slots, &maxram_size, machine_class);
 
     os_daemonize();
+    rcu_disable_atfork();
 
     if (pid_file && qemu_create_pidfile(pid_file) != 0) {
         error_report("could not acquire pid file: %s", strerror(errno));