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2025-02-03chardev/char-hub: implement backend chardev aggregatorRoman Penyaev1-1/+50
This patch implements a new chardev backend `hub` device, which aggregates input from multiple backend devices and forwards it to a single frontend device. Additionally, `hub` device takes the output from the frontend device and sends it back to all the connected backend devices. This allows for seamless interaction between different backend devices and a single frontend interface. The idea of the change is trivial: keep list of backend devices (up to 4), init them on demand and forward data buffer back and forth. The following is QEMU command line example: -chardev pty,path=/tmp/pty,id=pty0 \ -chardev vc,id=vc0 \ -chardev hub,id=hub0,chardevs.0=pty0,chardevs.1=vc0 \ -device virtconsole,chardev=hub0 \ -vnc 0.0.0.0:0 Which creates 2 backend devices: text virtual console (`vc0`) and a pseudo TTY (`pty0`) connected to the single virtio hvc console with the backend aggregator (`hub0`) help. `vc0` renders text to an image, which can be shared over the VNC protocol. `pty0` is a pseudo TTY backend which provides biderectional communication to the virtio hvc console. 'chardevs.N' list syntax is used for the sake of compatibility with the representation of JSON lists in 'key=val' pairs format of the util/keyval.c, despite the fact that modern QAPI way of parsing, namely qobject_input_visitor_new_str(), is not used. Choice of keeping QAPI list syntax may help to smoothly switch to modern parsing in the future. Signed-off-by: Roman Penyaev <r.peniaev@gmail.com> Reviewed-by: "Marc-André Lureau" <marcandre.lureau@redhat.com> Cc: qemu-devel@nongnu.org Message-ID: <20250123085327.965501-3-r.peniaev@gmail.com>
2024-10-15chardev/mux: implement detach of frontends from muxRoman Penyaev1-0/+1
With bitset management now it becomes feasible to implement the logic of detaching frontends from multiplexer. Signed-off-by: Roman Penyaev <r.peniaev@gmail.com> Cc: "Marc-André Lureau" <marcandre.lureau@redhat.com> Cc: qemu-devel@nongnu.org Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-ID: <20241014152408.427700-8-r.peniaev@gmail.com>
2024-10-15chardev/mux: switch mux frontends management to bitsetRoman Penyaev1-1/+1
Frontends can be attached and detached during run-time (although detach is not implemented, but will follow). Counter variable of muxes is not enough for proper attach/detach management, so this patch implements bitset: if bit is set for the `mux_bitset` variable, then frontend device can be found in the `backend` array (yes, huge confusion with backend and frontends names). Signed-off-by: Roman Penyaev <r.peniaev@gmail.com> Cc: "Marc-André Lureau" <marcandre.lureau@redhat.com> Cc: qemu-devel@nongnu.org Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-ID: <20241014152408.427700-7-r.peniaev@gmail.com>
2024-10-15chardev/mux: introduce `mux_chr_attach_frontend() callRoman Penyaev1-0/+2
Move away logic which attaches frontend device to a mux from `char-fe.c` to actual `char-mux.c` implementation and make it a separate function. No logic changes are made. Signed-off-by: Roman Penyaev <r.peniaev@gmail.com> Cc: "Marc-André Lureau" <marcandre.lureau@redhat.com> Cc: qemu-devel@nongnu.org Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-ID: <20241014152408.427700-6-r.peniaev@gmail.com>
2024-10-15chardev/mux: convert size members to unsigned intRoman Penyaev1-4/+4
There is no sense to keep `focus`, `mux_cnt`, `prod`, `cons` and `tag` variables as signed, those represent either size, either position in array, which both are unsigned. `focus` member of `MuxChardev` is kept signed, because initially set to -1. Signed-off-by: Roman Penyaev <r.peniaev@gmail.com> Cc: "Marc-André Lureau" <marcandre.lureau@redhat.com> Cc: qemu-devel@nongnu.org Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-ID: <20241014152408.427700-5-r.peniaev@gmail.com>
2024-10-15chardev/mux: use bool type for `linestart` and `term_got_escape`Roman Penyaev1-2/+2
Those are boolean variables, not signed integers. Signed-off-by: Roman Penyaev <r.peniaev@gmail.com> Cc: "Marc-André Lureau" <marcandre.lureau@redhat.com> Cc: qemu-devel@nongnu.org Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-ID: <20241014152408.427700-4-r.peniaev@gmail.com>
2024-10-15chardev/chardev-internal: remove unused `max_size` struct memberRoman Penyaev1-1/+0
Clean up forgotten leftovers. Signed-off-by: Roman Penyaev <r.peniaev@gmail.com> Cc: "Marc-André Lureau" <marcandre.lureau@redhat.com> Cc: qemu-devel@nongnu.org Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-ID: <20241014152408.427700-3-r.peniaev@gmail.com>
2022-05-11Clean up decorations and whitespace around header guardsMarkus Armbruster1-1/+2
Cleaned up with scripts/clean-header-guards.pl. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20220506134911.2856099-5-armbru@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2020-09-09Use DECLARE_*CHECKER* macrosEduardo Habkost1-1/+2
Generated using: $ ./scripts/codeconverter/converter.py -i \ --pattern=TypeCheckMacro $(git grep -l '' -- '*.[ch]') Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-Id: <20200831210740.126168-12-ehabkost@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-Id: <20200831210740.126168-13-ehabkost@redhat.com> Message-Id: <20200831210740.126168-14-ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2020-09-09Move QOM typedefs and add missing includesEduardo Habkost1-2/+3
Some typedefs and macros are defined after the type check macros. This makes it difficult to automatically replace their definitions with OBJECT_DECLARE_TYPE. Patch generated using: $ ./scripts/codeconverter/converter.py -i \ --pattern=QOMStructTypedefSplit $(git grep -l '' -- '*.[ch]') which will split "typdef struct { ... } TypedefName" declarations. Followed by: $ ./scripts/codeconverter/converter.py -i --pattern=MoveSymbols \ $(git grep -l '' -- '*.[ch]') which will: - move the typedefs and #defines above the type check macros - add missing #include "qom/object.h" lines if necessary Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-Id: <20200831210740.126168-9-ehabkost@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-Id: <20200831210740.126168-10-ehabkost@redhat.com> Message-Id: <20200831210740.126168-11-ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2020-07-13chardev: Extract system emulation specific codePhilippe Mathieu-Daudé1-0/+3
Split out code only used during system emulation, to reduce code pulled in user emulation and tools. Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <20200423202112.644-6-philmd@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
2020-07-13chardev: Reduce "char-mux.h" scope, rename it "chardev-internal.h"Philippe Mathieu-Daudé1-0/+62
No file out of chardev/ requires access to this header, restrict its scope. Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <20200423202112.644-5-philmd@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
generated by cgit v1.1 at 2025-03-14 23:56:06 +0000