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  1. Mar 06, 2021
    • Paolo Bonzini's avatar
      chardev: add nodelay option · a9b1315f
      Paolo Bonzini authored 
      
The "delay" option was introduced as a way to enable Nagle's algorithm
with ",nodelay".  Since the short form for boolean options has now been
deprecated, introduce a more properly named "nodelay" option.  The "delay"
option remains as an undocumented option.

"delay" and "nodelay" are mutually exclusive.  Because the check is
done at consumption time, the code also rejects them if one of the
two is specified via -set.

Based-on: <20210226080526.651705-1-pbonzini@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      a9b1315f
  3. Feb 25, 2021
  5. Feb 04, 2021
  7. Jan 13, 2021
  9. Jan 02, 2021
  11. Dec 19, 2020
    • Eric Blake's avatar
      qapi: Use QAPI_LIST_PREPEND() where possible · 54aa3de7
      Eric Blake authored 
      
Anywhere we create a list of just one item or by prepending items
(typically because order doesn't matter), we can use
QAPI_LIST_PREPEND().  But places where we must keep the list in order
by appending remain open-coded until later patches.

Note that as a side effect, this also performs a cleanup of two minor
issues in qga/commands-posix.c: the old code was performing
 new = g_malloc0(sizeof(*ret));
which 1) is confusing because you have to verify whether 'new' and
'ret' are variables with the same type, and 2) would conflict with C++
compilation (not an actual problem for this file, but makes
copy-and-paste harder).

Signed-off-by: default avatarEric Blake <eblake@redhat.com>
Message-Id: <20201113011340.463563-5-eblake@redhat.com>
Reviewed-by: default avatarMarkus Armbruster <armbru@redhat.com>
Acked-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
[Straightforward conflicts due to commit a8aa94b5 "qga: update
schema for guest-get-disks 'dependents' field" and commit a10b453a
"target/mips: Move mips_cpu_add_definition() from helper.c to cpu.c"
resolved.  Commit message tweaked.]
Signed-off-by: default avatarMarkus Armbruster <armbru@redhat.com>
      54aa3de7
  13. Dec 15, 2020
    • Paolo Bonzini's avatar
      chardev: do not use machine_init_done · 5a1ee607
      Paolo Bonzini authored 
      
machine_init_done is not the right flag to check when preconfig
is taken into account; for example "./qemu-system-x86_64 -serial
mon:stdio -preconfig" does not print the QEMU monitor header until after
exit_preconfig.  Add back a custom bool for mux character devices.  This
partially undoes commit c7278b43 ("chardev: introduce chr_machine_done
hook", 2018-03-12), but it keeps the cleaner logic using a function
pointer in ChardevClass.

Reviewed-by: default avatarIgor Mammedov <imammedo@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      5a1ee607
  15. Dec 10, 2020
  17. Nov 17, 2020
  19. Nov 03, 2020
    • Markus Armbruster's avatar
      sockets: Make abstract UnixSocketAddress depend on CONFIG_LINUX · 8acefc79
      Markus Armbruster authored 
      
The abstract socket namespace is a non-portable Linux extension.  An
attempt to use it elsewhere should fail with ENOENT (the abstract
address looks like a "" pathname, which does not resolve).  We report
this failure like

    Failed to connect socket abc: No such file or directory

Tolerable, although ENOTSUP would be better.

However, introspection lies: it has @abstract regardless of host
support.  Easy enough to fix: since Linux provides them since 2.2,
'if': 'defined(CONFIG_LINUX)' should do.

The above failure becomes

    Parameter 'backend.data.addr.data.abstract' is unexpected

I consider this an improvement.

Reviewed-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarMarkus Armbruster <armbru@redhat.com>
Signed-off-by: default avatarDaniel P. Berrangé <berrange@redhat.com>
      8acefc79
    • Markus Armbruster's avatar
      char-socket: Fix qemu_chr_socket_address() for abstract sockets · dea7cd17
      Markus Armbruster authored 
      
Commit 776b97d3 "qemu-sockets: add abstract UNIX domain socket
support" neglected to update qemu_chr_socket_address().  It shows
shows neither @abstract nor @tight.  Fix that.

Reviewed-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarMarkus Armbruster <armbru@redhat.com>
Signed-off-by: default avatarDaniel P. Berrangé <berrange@redhat.com>
      dea7cd17
    • Markus Armbruster's avatar
      sockets: Fix default of UnixSocketAddress member @tight · b08cc97d
      Markus Armbruster authored 
      
An optional bool member of a QAPI struct can be false, true, or absent.
The previous commit demonstrated that socket_listen() and
socket_connect() are broken for absent @tight, and indeed QMP chardev-
add also defaults absent member @tight to false instead of true.

In C, QAPI members are represented by two fields, has_MEMBER and MEMBER.
We have:

            has_MEMBER    MEMBER
    false         true     false
    true          true      true
    absent       false  false/ignore

When has_MEMBER is false, MEMBER should be set to false on write, and
ignored on read.

For QMP, the QAPI visitors handle absent @tight by setting both
@has_tight and @tight to false.  unix_listen_saddr() and
unix_connect_saddr() however use @tight only, disregarding @has_tight.
This is wrong and means that absent @tight defaults to false whereas it
should default to true.

The same is true for @has_abstract, though @abstract defaults to
false and therefore has the same behavior for all of QMP, HMP and CLI.
Fix unix_listen_saddr() and unix_connect_saddr() to check
@has_abstract/@has_tight, and to default absent @tight to true.

However, this is only half of the story.  HMP chardev-add and CLI
-chardev so far correctly defaulted @tight to true, but defaults to
false again with the above fix for HMP and CLI.  In fact, the "tight"
and "abstract" options now break completely.

Digging deeper, we find that qemu_chr_parse_socket() also ignores
@has_tight, leaving it false when it sets @tight.  That is also wrong,
but the two wrongs cancelled out.  Fix qemu_chr_parse_socket() to set
@has_tight and @has_abstract; writing testcases for HMP and CLI is left
for another day.

Fixes: 776b97d3
Reported-by: default avatarKevin Wolf <kwolf@redhat.com>
Reviewed-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Reviewed-by: default avatarEric Blake <eblake@redhat.com>
Signed-off-by: default avatarMarkus Armbruster <armbru@redhat.com>
Signed-off-by: default avatarDaniel P. Berrangé <berrange@redhat.com>
      b08cc97d
  21. Oct 21, 2020
  23. Oct 15, 2020
  25. Oct 12, 2020
  27. Sep 30, 2020
    • Daniel P. Berrangé's avatar
      char: fix logging when chardev write fails · d96aa5db
      Daniel P. Berrangé authored 
      The qemu_chr_write_buffer() method sends data to the chardev backend for
writing, and then also writes to the log file. In case the chardev
backend only writes part of the data buffer, we need to make sure we
only log the same subset. qemu_chr_write_buffer() will be invoked again
later to write the rest of the buffer.

In the case the chardev backend returns an error though, no further
attempts to likely to be made to write the data. We must therefore write
the entire buffer to the log immediately.

An example where this is important is with the socket backend. This will
return -1 for all writes if no client is currently connected. We still
wish to write data to the log file when no client is present though.
This used to work because the chardev would return "len" to pretend it
had written all data when no client is connected, but this changed to
return an error in

  commit 27109447
  Author: Dima Stepanov <dimastep@yandex-team.ru>
  Date: Thu May 28 12:11:18 2020 +0300

    char-socket: return -1 in case of disconnect during tcp_chr_write

and this broke the logging, resulting in all data being discarded when
no client is present.

Fixes: https://bugs.launchpad.net/qemu/+bug/1893691


Signed-off-by: default avatarDaniel P. Berrangé <berrange@redhat.com>
Reviewed-by: default avatarMarc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      d96aa5db
  29. Sep 16, 2020
  31. Sep 09, 2020
  33. Sep 08, 2020
    • Bruce Rogers's avatar
      meson: remove linkage of sdl to baum · fd6c986d
      Bruce Rogers authored 
      
Ever since commit 537fe2d6 there
has been a 'linkage' to sdl for compiling baum.c. Originally it
had to do with including sdl cflags for any file including sdl
headers. There is no longer any such need for baum.c, but the
association has persisted in the make system, and with the switch
to meson it has now become a hard requirement, which now causes
chardev-baum.so to not be produced if sdl is not configured.
Remove this bogus linkage.

Signed-off-by: default avatarBruce Rogers <brogers@suse.com>
Message-Id: <20200903152933.97838-1-brogers@suse.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      fd6c986d
  35. Sep 01, 2020
  37. Aug 27, 2020
  39. Aug 21, 2020
  41. Jul 13, 2020
    • Philippe Mathieu-Daudé's avatar
      chardev: Extract system emulation specific code · 30827bad
      Philippe Mathieu-Daudé authored 
      
Split out code only used during system emulation,
to reduce code pulled in user emulation and tools.

Signed-off-by: default avatarPhilippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200423202112.644-6-philmd@redhat.com>
Reviewed-by: default avatarRichard Henderson <richard.henderson@linaro.org>
Signed-off-by: default avatarMarc-André Lureau <marcandre.lureau@redhat.com>
      30827bad
    • Philippe Mathieu-Daudé's avatar
      chardev: Reduce "char-mux.h" scope, rename it "chardev-internal.h" · ffa0f7eb
      Philippe Mathieu-Daudé authored 
      
No file out of chardev/ requires access to this header,
restrict its scope.

Signed-off-by: default avatarPhilippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200423202112.644-5-philmd@redhat.com>
Reviewed-by: default avatarRichard Henderson <richard.henderson@linaro.org>
Signed-off-by: default avatarMarc-André Lureau <marcandre.lureau@redhat.com>
      ffa0f7eb
    • Philippe Mathieu-Daudé's avatar
      chardev: Restrict msmouse / wctablet / testdev to system emulation · c383efd5
      Philippe Mathieu-Daudé authored 
      
The msmouse / wctablet / testdev character devices are only
used by system emulation. Remove them from user mode and tools.

Signed-off-by: default avatarPhilippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200423202112.644-4-philmd@redhat.com>
Reviewed-by: default avatarRichard Henderson <richard.henderson@linaro.org>
Signed-off-by: default avatarMarc-André Lureau <marcandre.lureau@redhat.com>
      c383efd5
    • Marc-André Lureau's avatar
      char: fix use-after-free with dup chardev & reconnect · 68066019
      Marc-André Lureau authored 
      
With a reconnect socket, qemu_char_open() will start a background
thread. It should keep a reference on the chardev.

Fixes invalid read:
READ of size 8 at 0x6040000ac858 thread T7
    #0 0x5555598d37b8 in unix_connect_saddr /home/elmarco/src/qq/util/qemu-sockets.c:954
    #1 0x5555598d4751 in socket_connect /home/elmarco/src/qq/util/qemu-sockets.c:1109
    #2 0x555559707c34 in qio_channel_socket_connect_sync /home/elmarco/src/qq/io/channel-socket.c:145
    #3 0x5555596adebb in tcp_chr_connect_client_task /home/elmarco/src/qq/chardev/char-socket.c:1104
    #4 0x555559723d55 in qio_task_thread_worker /home/elmarco/src/qq/io/task.c:123
    #5 0x5555598a6731 in qemu_thread_start /home/elmarco/src/qq/util/qemu-thread-posix.c:519
    #6 0x7ffff40d4431 in start_thread (/lib64/libpthread.so.0+0x9431)
    #7 0x7ffff40029d2 in __clone (/lib64/libc.so.6+0x1019d2)

Signed-off-by: default avatarMarc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: default avatarDaniel P. Berrangé <berrange@redhat.com>
Message-Id: <20200420112012.567284-1-marcandre.lureau@redhat.com>
      68066019
    • Marc-André Lureau's avatar
      chardev: don't abort on attempt to add duplicated chardev · 14a7a203
      Marc-André Lureau authored 
      
This is a regression from commit d2623129 ("qom: Drop parameter @errp
of object_property_add() & friends").

(qemu) chardev-add id=null,backend=null
(qemu) chardev-add id=null,backend=null
Unexpected error in object_property_try_add() at /home/elmarco/src/qemu/qom/object.c:1166:
attempt to add duplicate property 'null' to object (type 'container')

That case is currently not covered in the test suite, but will be with
the queued patch "char: fix use-after-free with dup chardev &
reconnect".

Fixes: d2623129
Signed-off-by: default avatarMarc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: default avatarMarkus Armbruster <armbru@redhat.com>
      14a7a203
    • Li Feng's avatar
      char-socket: initialize reconnect timer only when the timer doesn't start · 2b61bb71
      Li Feng authored 
      
When the disconnect event is triggered in the connecting stage,
the tcp_chr_disconnect_locked may be called twice.

The first call:
    #0  qemu_chr_socket_restart_timer (chr=0x55555582ee90) at chardev/char-socket.c:120
    #1  0x000055555558e38c in tcp_chr_disconnect_locked (chr=<optimized out>) at chardev/char-socket.c:490
    #2  0x000055555558e3cd in tcp_chr_disconnect (chr=0x55555582ee90) at chardev/char-socket.c:497
    #3  0x000055555558ea32 in tcp_chr_new_client (chr=chr@entry=0x55555582ee90, sioc=sioc@entry=0x55555582f0b0) at chardev/char-socket.c:892
    #4  0x000055555558eeb8 in qemu_chr_socket_connected (task=0x55555582f300, opaque=<optimized out>) at chardev/char-socket.c:1090
    #5  0x0000555555574352 in qio_task_complete (task=task@entry=0x55555582f300) at io/task.c:196
    #6  0x00005555555745f4 in qio_task_thread_result (opaque=0x55555582f300) at io/task.c:111
    #7  qio_task_wait_thread (task=0x55555582f300) at io/task.c:190
    #8  0x000055555558f17e in tcp_chr_wait_connected (chr=0x55555582ee90, errp=0x555555802a08 <error_abort>) at chardev/char-socket.c:1013
    #9  0x0000555555567cbd in char_socket_client_reconnect_test (opaque=0x5555557fe020 <client8unix>) at tests/test-char.c:1152
The second call:
    #0  0x00007ffff5ac3277 in raise () from /lib64/libc.so.6
    #1  0x00007ffff5ac4968 in abort () from /lib64/libc.so.6
    #2  0x00007ffff5abc096 in __assert_fail_base () from /lib64/libc.so.6
    #3  0x00007ffff5abc142 in __assert_fail () from /lib64/libc.so.6
    #4  0x000055555558d10a in qemu_chr_socket_restart_timer (chr=0x55555582ee90) at chardev/char-socket.c:125
    #5  0x000055555558df0c in tcp_chr_disconnect_locked (chr=<optimized out>) at chardev/char-socket.c:490
    #6  0x000055555558df4d in tcp_chr_disconnect (chr=0x55555582ee90) at chardev/char-socket.c:497
    #7  0x000055555558e5b2 in tcp_chr_new_client (chr=chr@entry=0x55555582ee90, sioc=sioc@entry=0x55555582f0b0) at chardev/char-socket.c:892
    #8  0x000055555558e93a in tcp_chr_connect_client_sync (chr=chr@entry=0x55555582ee90, errp=errp@entry=0x7fffffffd178) at chardev/char-socket.c:944
    #9  0x000055555558ec78 in tcp_chr_wait_connected (chr=0x55555582ee90, errp=0x555555802a08 <error_abort>) at chardev/char-socket.c:1035
    #10 0x000055555556804b in char_socket_client_test (opaque=0x5555557fe020 <client8unix>) at tests/test-char.c:1023

Run test/test-char to reproduce this issue.

test-char: chardev/char-socket.c:125: qemu_chr_socket_restart_timer: Assertion `!s->reconnect_timer' failed.

Signed-off-by: default avatarLi Feng <fengli@smartx.com>
Acked-by: default avatarMarc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20200522025554.41063-1-fengli@smartx.com>
      2b61bb71
  43. Jul 10, 2020
    • Markus Armbruster's avatar
      qemu-option: Use returned bool to check for failure · 235e59cf
      Markus Armbruster authored 
      
The previous commit enables conversion of

    foo(..., &err);
    if (err) {
        ...
    }

to

    if (!foo(..., &err)) {
        ...
    }

for QemuOpts functions that now return true / false on success /
error.  Coccinelle script:

    @@
    identifier fun = {
        opts_do_parse, parse_option_bool, parse_option_number,
        parse_option_size, qemu_opt_parse, qemu_opt_rename, qemu_opt_set,
        qemu_opt_set_bool, qemu_opt_set_number, qemu_opts_absorb_qdict,
        qemu_opts_do_parse, qemu_opts_from_qdict_entry, qemu_opts_set,
        qemu_opts_validate
    };
    expression list args, args2;
    typedef Error;
    Error *err;
    @@
    -    fun(args, &err, args2);
    -    if (err)
    +    if (!fun(args, &err, args2))
         {
             ...
         }

A few line breaks tidied up manually.

Signed-off-by: default avatarMarkus Armbruster <armbru@redhat.com>
Reviewed-by: default avatarEric Blake <eblake@redhat.com>
Reviewed-by: default avatarVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20200707160613.848843-15-armbru@redhat.com>
[Conflict with commit 0b6786a9 "block/amend: refactor qcow2 amend
options" resolved by rerunning Coccinelle on master's version]
      235e59cf
  45. Jul 07, 2020
  47. Jul 02, 2020
  49. Jun 18, 2020