New device, has never been released, so we can still improve things
without worrying about compatibility.
Naming is a mess. The code calls the device driver CirMemCharDriver,
the public API calls it "memory", "memchardev", or "memchar", and the
special commands are named like "memchar-FOO". "memory" is a
particularly unfortunate choice, because there's another character
device driver called MemoryDriver. Moreover, the device's distinctive
property is that it's a ring buffer, not that's in memory. Therefore:
* Rename CirMemCharDriver to RingBufCharDriver, and call the thing a
"ringbuf" in the API.
* Rename QMP and HMP commands from memchar-FOO to ringbuf-FOO.
* Rename device parameter from maxcapacity to size (simple words are
good for you).
* Clearly mark the parameter as optional in documentation.
* Fix error reporting so that chardev-add reports to current monitor,
not stderr.
* Replace cirmem in C identifiers by ringbuf.
* Rework documentation. Document the impact of our crappy UTF-8
handling on reading.
* QMP examples that even work.
I could split this up into multiple commits, but they'd change the
same documentation lines multiple times. Not worth it.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Inline trivial cirmem_chr_is_empty() into its only caller.
Rename qemu_chr_cirmem_count() to cirmem_count().
Fast ring buffer index wraparound. Without this, there's no point in
restricting size to a power two.
qemu_is_chr(chr, "memory") returns *zero* when chr is a memory
character device, which isn't what I'd expect. Replace it by the
saner and more obviously correct chr_is_cirmem(). Also avoids
encouraging testing for specific character devices elsewhere.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This is a new device, so there's no compatibility to maintain, and its
use case isn't common enough to justify shorthand syntax.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Undocumented misfeature, get rid of it while we can.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Const-correctness, consistently use standard C types instead of mixing
them with GLib types.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
New errors should be generic unless there's a real use case for rich
errors.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
The data returned has a well-defined size, which makes the size
returned along with it redundant at best. Drop it.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Command memchar-write takes data and size parameter. Begs the
question what happens when data doesn't match size.
With format base64, qmp_memchar_write() copies the full data argument,
regardless of size argument.
With format utf8, qmp_memchar_write() copies size bytes from data,
happily reading beyond data. Copies crap from the heap or even
crashes.
Drop the size parameter, and always copy the full data argument.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
# By Lei Li (3) and others
# Via Luiz Capitulino
* luiz/queue/qmp:
QAPI: Introduce memchar-read QMP command
QAPI: Introduce memchar-write QMP command
qemu-char: Add new char backend CirMemCharDriver
docs: document virtio-balloon stats
balloon: re-enable balloon stats
balloon: drop old stats code & API
block: Monitor command commit neglects to report some errors
Avoid unused variable warnings:
qemu-char.c: In function 'qmp_chardev_open_port':
qemu-char.c:3132: warning: unused variable 'fd'
qemu-char.c:3132: warning: unused variable 'flags'
in configurations with neither HAVE_CHARDEV_TTY nor
HAVE_CHARDEV_PARPORT set.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
The ptsname is returned directly, so there is no need to
use query-chardev to figure the pty device path.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
qemu_chr_open_socket is split into two functions. All initialization
after creating the socket file handler is split away into the new
qemu_chr_open_socket_fd function.
chr->filename doesn't get filled from QemuOpts any more. Qemu gathers
the information using getsockname and getnameinfo instead. This way it
will also work correctly for file handles passed via file descriptor
passing.
Finally qmp_chardev_open_socket() is the actual qmp hotplug
implementation which basically just calls socket_listen or
socket_connect and the new qemu_chr_open_socket_fd function.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Similar to file, except that no separate in/out files are supported
because it's pointless for direct device access. Also the special
tty ioctl hooks (pass through linespeed settings etc) are activated
on Unix.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Add chardev-add and chardev-remove qmp commands. Hotplugging
a null chardev is supported for now, more will be added later.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
qemu_chr_new_from_opts handles QemuOpts release now, so callers don't
have to worry. It will either be saved in CharDriverState, then
released in qemu_chr_delete, or in the error case released instantly.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Commit 586502189e breaks libvirt pty
support because it tried to figure the pts name from stderr output.
Fix this by moving the label to the end of the line, this way the
libvirt parser does still recognise the message. libvirt looks
for "char device redirected to ${ptsname}<whitespace>".
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Curses display requires stdin/out to stay on the terminal,
so -daemonize makes no sense in this case. Instead of
leaving display uninitialized like is done since 995ee2bf46,
explicitly detect this case earlier and error out.
-nographic can actually be used with -daemonize, by redirecting
everything to a null device, but the problem is that according
to documentation and historical behavour, -nographic redirects
guest ports to stdin/out, which, again, makes no sense in case
of -daemonize. Since -nographic is a legacy option, don't bother
fixing this case (to allow -nographic and -daemonize by redirecting
guest ports to null instead of stdin/out in this case), but disallow
it completely instead, to stop garbling host terminal.
If no display display needed and user wants to use -nographic,
the right way to go is to use
-serial null -parallel null -monitor none -display none -vga none
instead of -nographic.
Also prevent the same issue -- it was possible to get garbled
host tty after
-nographic -daemonize
and it is still possible to have it by using
-serial stdio -daemonize
Fix this by disallowing opening stdio chardev when -daemonize
is specified.
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Changes since V1:
- Avoid crashing since qemu_opts_id() may return null on some
systems according to Markus's suggestion.
When controlling a qemu instance from another program, it's
hard to know which serial port or monitor device is redirected
to which pty. With more than one device using "pty" a lot of
guesswork is involved.
$ ./x86_64-softmmu/qemu-system-x86_64 -serial pty -serial pty -monitor pty
char device redirected to /dev/pts/5
char device redirected to /dev/pts/6
char device redirected to /dev/pts/7
Although we can find out what everything else is connected to
by the "info chardev" with "-monitor stdio" in the command line,
It'd be very useful to be able to have qemu inherit pseudo-tty
file descriptors so they could just be specified on the command
line like:
$ ./x86_64-softmmu/qemu-system-x86_64 -serial pty -serial pty -monitor pty
char device compat_monitor0 redirected to /dev/pts/5
char device serial0 redirected to /dev/pts/6
char device serial1 redirected to /dev/pts/7
Referred link: https://bugs.launchpad.net/qemu/+bug/938552
Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
* bonzini/header-dirs: (45 commits)
janitor: move remaining public headers to include/
hw: move executable format header files to hw/
fpu: move public header file to include/fpu
softmmu: move remaining include files to include/ subdirectories
softmmu: move include files to include/sysemu/
misc: move include files to include/qemu/
qom: move include files to include/qom/
migration: move include files to include/migration/
monitor: move include files to include/monitor/
exec: move include files to include/exec/
block: move include files to include/block/
qapi: move include files to include/qobject/
janitor: add guards to headers
qapi: make struct Visitor opaque
qapi: remove qapi/qapi-types-core.h
qapi: move inclusions of qemu-common.h from headers to .c files
ui: move files to ui/ and include/ui/
qemu-ga: move qemu-ga files to qga/
net: reorganize headers
net: move net.c to net/
...
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Add a new spice chardev to allow arbitrary communication between the
host and the Spice client via the spice server.
Examples:
This allows the Spice client to have a special port for the qemu
monitor:
... -chardev spiceport,name=org.qemu.monitor,id=monitorport
-mon chardev=monitorport
v2:
- remove support for chardev to chardev linking
- conditionnaly compile with SPICE_SERVER_VERSION
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
The vm clock may be stopped, and then we won't get open events anymore.
Seen with QMP sessions.
Reported-by: Dietmar Maurer <dietmar@proxmox.com>
Tested-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
As the block layer may decide to flush bottom-halfs while the machine is
still initializing (e.g. to read geometry data from the disk), our
postponed open event may be processed before the last frontend
registered with a muxed chardev.
Until the semantics of BHs have been clarified, use an expired timer to
achieve the same effect (suggested by Paolo Bonzini). This requires to
perform the alarm timer initialization earlier as otherwise timer
subsystem can be used before being ready.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
This patch mostly mimics what was done to TCP sockets, but simpler
because there is only one address to try. It also includes a free EINTR
bug fix.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This lets me adjust the clients to do proper error propagation first,
thus avoiding temporary regressions in the quality of the error messages.
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
getaddrinfo can give us a list of addresses, but we only try to
connect to the first one. If that fails we never proceed to
the next one. This is common on desktop setups that often have ipv6
configured but not actually working.
To fix this make inet_connect_nonblocking retry connection with a different
address.
callers on inet_nonblocking_connect register a callback function that will
be called when connect opertion completes, in case of failure the fd will have
a negative value
Signed-off-by: Orit Wasserman <owasserm@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
No need to add non blocking parameters to the blocking inet_connect
add block parameter for inet_connect_opts instead of using QemuOpt "block".
Signed-off-by: Orit Wasserman <owasserm@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
tcp_chr_connect(), unlike for example udp_chr_update_read_handler() does
not check if the fd it is using is valid (>= 0) before passing it to
qemu_set_fd_handler2(). If using e.g. a TCP serial port, which is not
initially connected, this can result in -1 being passed to FD_ISSET, which
has undefined behaviour. On x86 it seems to harmlessly return 0, but on
PowerPC, it causes a fortify buffer overflow error to be thrown.
This patch fixes this by putting an extra test in tcp_chr_connect(), and
also adds an assert qemu_set_fd_handler2() to catch other such errors on
all platforms, rather than just some.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
commit c3767ed0eb
qemu-char: (Re-)connect for tcp_chr_write() unconnected writing
Has no hope of working because tcp_chr_connect() does not actually connect.
455aa1e08 just fixes the SEGV with server() but the attempt to connect a client
socket is still completely broken.
This patch reverts both.
Reported-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Markus Armbruster