With this patch, I/O handlers (including event notifier handlers) can be
attached to a single AioContext.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Start introducing AioContext, which will let us remove globals from
aio.c/async.c, and introduce multiple I/O threads.
The bottom half functions now take an additional AioContext argument.
A bottom half is created with a specific AioContext that remains the
same throughout the lifetime. qemu_bh_new is just a wrapper that
uses a global context.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This adds to aio.c a platform-independent API based on EventNotifiers, that
can be used by both POSIX and Win32.
Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Otherwise, chardevs will not be able to create a bottom half as soon
as that will require an AioContext.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This takes the eventfd emulation code from the main loop. When the
EventNotifier is used for the main loop too, we need this compatibility
code.
Without CONFIG_EVENTFD, event_notifier_get_fd is only usable for the
"read" side of the notifier, for example to set a select() handler.
The return value of event_notifier_set changes to the cleaner 0/-errno.
No caller is actually checking the return value.
Reviewed-by: Anthony Liguori <anthony@codemonkey.ws>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
qemu-tool.c has its own (largeish) set of dependencies. Weak aliases
can be placed directly where people use them, and do not contribute
to increasing the dependencies of generic utility files.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Commit ad0b5321f1 forgot to add
QEMU_MADV_HUGEPAGE macros for when CONFIG_MADVISE is not defined.
This broke the build for Windows. Fix it.
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
* bonzini/nbd-next: (30 commits)
qmp: add NBD server commands
block: add close notifiers
block: prepare code for adding block notifiers
qemu-sockets: add socket_listen, socket_connect, socket_parse
tests: do not include tools-obj-y Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
qemu-sockets: return InetSocketAddress from inet_parse
qapi: add socket address types
build: add QAPI files to the tools
vnc: drop QERR_VNC_SERVER_FAILED
qemu-sockets: add error propagation to Unix socket functions
qemu-sockets: add error propagation to inet_parse
qemu-sockets: add error propagation to inet_dgram_opts
qemu-sockets: add error propagation to inet_connect_addr
qemu-sockets: include strerror or gai_strerror output in error messages
vnc: add error propagation to vnc_display_open
vnc: reorganize code for reverse mode
vnc: introduce a single label for error returns
vnc: avoid Yoda conditionals
qemu-ga: ask and print error information from qemu-sockets
nbd: ask and print error information from qemu-sockets
...
Adding an NBD server inside QEMU is trivial, since all the logic is
in nbd.c and can be shared easily between qemu-nbd and QEMU itself.
The main difference is that qemu-nbd serves a single unnamed export,
while QEMU serves named exports.
Acked-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
The first user of close notifiers will be the embedded NBD server.
It would be possible to use them to do some of the ad hoc processing
(e.g. for block jobs and I/O limits) that is currently done by
bdrv_close.
Acked-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
There is no reason in principle to skip job cancellation and draining
of pending I/O when there is no medium in the disk. Do these unconditionally,
which also prepares the code for the next patch.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
These are QAPI-friendly versions of the qemu-sockets functions. They
support IP sockets, Unix sockets, and named file descriptors, using a
QAPI union to dispatch to the correct function.
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
We need them because qemu-sockets will soon be using SocketAddress.
Acked-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
target_phys_addr_t is unwieldly, violates the C standard (_t suffixes are
reserved) and its purpose doesn't match the name (most target_phys_addr_t
addresses are not target specific). Replace it with a finger-friendly,
standards conformant hwaddr.
Outstanding patchsets can be fixed up with the command
git rebase -i --exec 'find -name "*.[ch]"
| xargs s/target_phys_addr_t/hwaddr/g' origin
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
We now always return "nice" error messages in errp when we goto fail.
Drop the default error message.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Before:
$ qemu-system-x86_64 -monitor unix:/vvv,server=off
connect(unix:/vvv): No such file or directory
chardev: opening backend "socket" failed
After:
$ x86_64-softmmu/qemu-system-x86_64 -monitor unix:/vvv,server=off
qemu-system-x86_64: -monitor unix:/vvv,server=off: Failed to connect to socket: No such file or directory
chardev: opening backend "socket" failed
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
perror and fprintf can be removed because all clients can now consume
Errors properly. However, we'll need to change the non-blocking connect
handlers to take an Error, in order to improve error handling for
migration with the TCP protocol.
This is a minor degradation in error reporting for outgoing migration.
However, until 1.2 this case just failed without even attempting to
connect, so it is still an improvement as far as overall QoI is
concerned.
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Among others, before:
$ qemu-system-x86_64 -chardev socket,port=12345,id=char
inet_connect: host and/or port not specified
chardev: opening backend "socket" failed
After:
$ x86_64-softmmu/qemu-system-x86_64 -chardev socket,port=12345,id=char
qemu-system-x86_64: -chardev socket,port=12345,id=char: host and/or port not specified
chardev: opening backend "socket" failed
perror and fprintf can be removed because all clients can now
consume Errors properly.
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Before:
$ qemu-system-x86_64 -vnc foo.bar:12345
getaddrinfo(foo.bar,18245): Name or service not known
Failed to start VNC server on `foo.bar:12345'
$ qemu-system-x86_64 -vnc localhost:12345,reverse=on
inet_connect_opts: connect(ipv4,yakj.usersys.redhat.com,127.0.0.1,12345): Connection refused
Failed to start VNC server on `localhost:12345,reverse=on'
After:
$ x86_64-softmmu/qemu-system-x86_64 -vnc foo.bar:12345
Failed to start VNC server on `foo.bar:12345': address resolution failed for foo.bar:18245: Name or service not known
$ x86_64-softmmu/qemu-system-x86_64 -vnc localhost:12345,reverse=on
Failed to start VNC server on `localhost:12345,reverse=on': Failed to connect to socket: Connection refused
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Before:
$ qemu-system-x86_64 nbd:localhost:12345
inet_connect_opts: connect(ipv4,yakj.usersys.redhat.com,127.0.0.1,12345): Connection refused
qemu-system-x86_64: could not open disk image nbd:localhost:12345: Connection refused
After:
$ x86_64-softmmu/qemu-system-x86_64 nbd:localhost:12345
qemu-system-x86_64: Failed to connect to socket: Connection refused
qemu-system-x86_64: could not open disk image nbd:localhost:12345: Connection refused
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
And remove the superfluous integer return value.
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Error propagation is already there for socket backends. Add it to other
protocols, simplifying code that tests for errors that will never happen.
With all protocols understanding Error, the code can be simplified
further by removing the return value.
Unfortunately, the quality of error messages varies depending
on where the error is detected, because no Error is passed to the
NonBlockingConnectHandler. Thus, the exact error message still cannot
be sent to the user if the OS reports it asynchronously via SO_ERROR.
If NonBlockingConnectHandler received an Error**, we could for
example report the error class and/or message via a new field of the
query-migration command even if it is reported asynchronously.
Before:
(qemu) migrate fd:ffff
migrate: An undefined error has occurred
(qemu) info migrate
(qemu)
After:
(qemu) migrate fd:ffff
migrate: File descriptor named 'ffff' has not been found
(qemu) info migrate
capabilities: xbzrle: off
Migration status: failed
total time: 0 milliseconds
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This makes migration-unix.c again a cut-and-paste job from migration-tcp.c,
exactly as it was in the beginning. :)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
The call to migrate_fd_error() was missing for non-socket backends, so
centralize it in qmp_migrate().
Before:
(qemu) migrate fd:ffff
migrate: An undefined error has occurred
(qemu) info migrate
(qemu)
After:
(qemu) migrate fd:ffff
migrate: An undefined error has occurred
(qemu) info migrate
capabilities: xbzrle: off
Migration status: failed
total time: 0 milliseconds
(The awful error message will be fixed later in the series).
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
The migration code is using errp to detect "internal" errors, this means
that it relies on errp being non-NULL.
No impact so far because our only QMP clients (the QMP marshaller and HMP)
never pass a NULL Error **. But if we had others, this patch would make
sure that migration can work with a NULL Error **.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.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>
They are just wrappers and do not need a Win32-specific version.
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
