This series add support for talking to QEMU guest agent via a vsock transport. This transport is attempted when there's no ready virtio-serial channels **and** the domain has a usable vsock CID. AF_VSOCK are sockets too, so most of the virtio-serial/UNIX socket code is reused for everything except the connection lifecycle management (that is, initial connection etc.). Since QGA has no readiness notification mechanism for vsock transport, unlike for virtio-serial transport, we have to knock on the port to probe for readiness. For that, a custom backoff logic with cancellation support is implemented. Both the new virVsockConnectQuiet helper and the vsock QGA connection logic itself are covered by new tests. Polina Vishneva (6): util: Add virVsockConnectQuiet helper qemu: Extract qemuProcessResetAgent helper qemu: Add qemuDomainVsockHasGuestCid helper qemu: Support AF_VSOCK transport for QGA communication tests: Add a unit test for virVsockConnectQuiet() tests: Add a test for qemuConnectAgent() to cover the vsock path src/hypervisor/qemu_agent.c | 73 +++++---- src/hypervisor/qemu_agent.h | 9 ++ src/libvirt_private.syms | 2 + src/qemu/qemu_domain.c | 28 +++- src/qemu/qemu_domain.h | 8 + src/qemu/qemu_driver.c | 16 +- src/qemu/qemu_hotplug.c | 6 + src/qemu/qemu_process.c | 305 +++++++++++++++++++++++++++++++---- src/qemu/qemu_process.h | 2 + src/util/virvsock.c | 71 +++++++- src/util/virvsock.h | 10 ++ tests/meson.build | 3 + tests/qemuagenttest.c | 43 ++++- tests/qemumonitortestutils.c | 119 +++++++++++++- tests/qemumonitortestutils.h | 4 + tests/qemuvsockagentmock.c | 65 ++++++++ tests/virvsockmock.c | 143 ++++++++++++++++ tests/virvsocktest.c | 133 +++++++++++++++ 18 files changed, 963 insertions(+), 77 deletions(-) create mode 100644 tests/qemuvsockagentmock.c create mode 100644 tests/virvsockmock.c create mode 100644 tests/virvsocktest.c -- 2.54.0