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Juraj Marcin 1bd4237cb1 util/qemu-sockets: Introduce inet socket options controlling TCP keep-alive 
With the default TCP stack configuration, it could be even 2 hours
before the connection times out due to the other side not being
reachable. However, in some cases, the application needs to be aware of
a connection issue much sooner.

This is the case, for example, for postcopy live migration. If there is
no traffic from the migration destination guest (server-side) to the
migration source guest (client-side), the destination keeps waiting for
pages indefinitely and does not switch to the postcopy-paused state.
This can happen, for example, if the destination QEMU instance is
started with the '-S' command line option and the machine is not started
yet, or if the machine is idle and produces no new page faults for
not-yet-migrated pages.

This patch introduces new inet socket parameters that control count,
idle period, and interval of TCP keep-alive packets before the
connection is considered broken. These parameters are available on
systems where the respective TCP socket options are defined, that
includes Linux, Windows, macOS, but not OpenBSD. Additionally, macOS
defines TCP_KEEPIDLE as TCP_KEEPALIVE instead, so the patch supplies its
own definition.

The default value for all is 0, which means the system configuration is
used.

Signed-off-by: Juraj Marcin <jmarcin@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2025-05-22 11:24:41 +01:00
..
acpi.json qapi: convert "Example" sections without titles 2024-07-17 10:20:53 +02:00
audio.json dbus: add -audio dbus nsamples option 2025-02-03 21:16:07 +04:00
authz.json qapi: Reformat doc comments to conform to current conventions 2023-05-10 10:01:01 +02:00
block-core.json mirror: Allow QMP override to declare target already zero 2025-05-14 16:55:10 -05:00
block-export.json qapi: merge common parts of NbdServerOptions and nbd-server-start data 2025-03-04 16:44:48 -06:00
block.json qapi: Refill doc comments to conform to conventions 2024-08-05 09:31:51 +02:00
char.json qapi/char.json: minor doc rewording for hub device 2025-02-24 13:48:26 +01:00
common.json hw/qdev-properties-system: Introduce EndianMode QAPI enum 2025-02-16 14:33:39 +01:00
compat.json qapi: Belatedly update CompatPolicy documentation for unstable 2023-10-19 07:02:29 +02:00
control.json qapi: Refill doc comments to conform to conventions 2024-08-05 09:31:51 +02:00
crypto.json crypto: Introduce SM3 hash hmac pbkdf algorithm 2024-11-05 18:37:18 +00:00
cryptodev.json qapi: Document QCryptodevBackendServiceType 2024-10-02 09:10:01 +02:00
cxl.json qapi: fix colon in Since tag section 2025-02-10 15:45:04 +01:00
dump.json qapi: Refill doc comments to conform to conventions 2024-08-05 09:31:51 +02:00
ebpf.json qapi/ebpf: Drop temporary 'prefix' 2024-09-10 13:22:47 +02:00
error.json qapi: Reformat doc comments to conform to current conventions 2023-05-10 10:01:01 +02:00
introspect.json qapi/introspect: Supply missing member documentation 2024-10-02 09:10:01 +02:00
job.json qapi: synchronize jobs and block-jobs documentation 2025-05-01 12:12:19 +03:00
machine-common.json qapi/qom: Define cache enumeration and properties for machine 2024-11-05 23:32:25 +00:00
machine-target.json qapi/machine-target.json: fix "in in" typo in comment 2025-05-09 23:49:26 +03:00
machine.json qapi: Rename TargetInfo structure as QemuTargetInfo 2025-04-25 17:09:58 +02:00
meson.build hw/uefi: add var-service-json.c + qapi for NV vars. 2025-03-04 12:02:50 +01:00
migration.json migration: Update migrate_cancel documentation 2025-02-14 15:19:06 -03:00
misc-target.json qapi/misc-target: Fix the doc to distinguish query-sgx and query-sgx-capabilities 2025-05-20 08:04:19 +02:00
misc.json qapi: Refill doc comments to conform to conventions 2024-08-05 09:31:51 +02:00
net.json net: vhost-user: add QAPI events to report connection state 2025-02-21 07:21:25 -05:00
opts-visitor.c qapi: Inline and remove QERR_INVALID_PARAMETER definition 2024-04-24 09:50:58 +02:00
pci.json qapi/pci: Supply missing member documentation 2024-10-02 09:10:01 +02:00
pragma.json qapi: Document QCryptodevBackendServiceType 2024-10-02 09:10:01 +02:00
qapi-clone-visitor.c qapi: Move include/qapi/qmp/ to include/qobject/ 2025-02-10 15:33:16 +01:00
qapi-dealloc-visitor.c qapi: Move include/qapi/qmp/ to include/qobject/ 2025-02-10 15:33:16 +01:00
qapi-forward-visitor.c qapi: change 'unsigned special_features' to 'uint64_t features' 2025-02-10 15:45:04 +01:00
qapi-schema.json qapi/qapi-schema: Address the introduction's bit rot 2025-04-08 09:04:34 +02:00
qapi-type-helpers.c qapi: New strv_from_str_list() 2024-03-04 07:12:40 +01:00
qapi-util.c qapi: change 'unsigned special_features' to 'uint64_t features' 2025-02-10 15:45:04 +01:00
qapi-visit-core.c qapi: change 'unsigned special_features' to 'uint64_t features' 2025-02-10 15:45:04 +01:00
qdev.json docs: Fix some typos (found by codespell and typos) 2025-04-13 13:45:04 +03:00
qmp-dispatch.c qapi: change 'unsigned special_features' to 'uint64_t features' 2025-02-10 15:45:04 +01:00
qmp-event.c qapi: Move include/qapi/qmp/ to include/qobject/ 2025-02-10 15:33:16 +01:00
qmp-registry.c qapi: change 'unsigned special_features' to 'uint64_t features' 2025-02-10 15:45:04 +01:00
qobject-input-visitor.c qapi: change 'unsigned special_features' to 'uint64_t features' 2025-02-10 15:45:04 +01:00
qobject-output-visitor.c qapi: change 'unsigned special_features' to 'uint64_t features' 2025-02-10 15:45:04 +01:00
qom.json qapi/qom.json: fix "the the" typo in comment 2025-05-09 23:49:26 +03:00
replay.json qapi: convert "Example" sections without titles 2024-07-17 10:20:53 +02:00
rocker.json qapi/rocker: Tidy up query-rocker-of-dpa-flows example 2025-04-08 09:04:20 +02:00
run-state.json qapi: Refill doc comments to conform to conventions 2024-08-05 09:31:51 +02:00
sockets.json util/qemu-sockets: Introduce inet socket options controlling TCP keep-alive 2025-05-22 11:24:41 +01:00
stats.json qapi: Refill doc comments to conform to conventions 2024-08-05 09:31:51 +02:00
string-input-visitor.c qapi: Move include/qapi/qmp/ to include/qobject/ 2025-02-10 15:33:16 +01:00
string-output-visitor.c string-output-visitor: Fix (pseudo) struct handling 2024-01-26 11:16:58 +01:00
tpm.json qapi: convert "Example" sections without titles 2024-07-17 10:20:53 +02:00
trace-events qapi: Generalize struct member policy checking 2021-10-29 18:23:09 +02:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
trace.json qapi: convert "Example" sections without titles 2024-07-17 10:20:53 +02:00
transaction.json qapi: Refill doc comments to conform to conventions 2024-08-05 09:31:51 +02:00
uefi.json hw/uefi: add var-service-json.c + qapi for NV vars. 2025-03-04 12:02:50 +01:00
ui.json qapi/ui: Fix documentation of upper bound value in InputMoveEvent 2025-02-10 15:45:04 +01:00
vfio.json qapi/vfio: Rename VfioMigrationState to Qapi*, and drop prefix 2024-09-10 14:03:45 +02:00
virtio.json hw/vmapple/virtio-blk: Add support for apple virtio-blk 2025-03-04 14:45:34 +01:00
yank.json qapi: convert "Example" sections without titles 2024-07-17 10:20:53 +02:00