The patch series originates from the NS16550 UART emulator series [1] (x86) which requires ability to switch physical console input to a PVH/HVM domain with an emulated UART.
Currently, on x86, console input can be rotated in round-robin manner only between dom0, PV shim, and Xen itself. On Arm the input rotation can include domUs with vpl011. The main idea of this series is introducing a per-domain permission flag that is set during domain initialization and used by the console driver to switch the input across permitted domains. Patch 1 performs rename of switch_serial_input() to fit the console driver notation. Patch 2 simplifies the existing vUART code by using newly introduced API. Patch 3 introduces a new domain permission flag to mark ownership of the console input for the console driver. Patch 4 cleans up the console input switch logic by removing dependency on max_init_domid. Depends on patches 1, 3 and [2]. Patch 5 performs rename of console_rx to console_domid to match the usage of the symbol in the code. [1] https://lore.kernel.org/xen-devel/20250103-vuart-ns8250-v3-v1-0-c5d36b31d...@ford.com/ [2] https://lore.kernel.org/xen-devel/20250519192306.1364471-1-dmuk...@ford.com/ [3] Link to v2: https://lore.kernel.org/xen-devel/20250331230508.440198-1-dmuk...@ford.com/ [4] Link to CI: https://gitlab.com/xen-project/people/dmukhin/xen/-/pipelines/1825448327 Denis Mukhin (5): xen/console: rename switch_serial_input() to console_switch_input() xen/console: introduce console_get_domid() xen/console: introduce console input permission xen/console: remove max_init_domid dependency xen/console: rename console_rx to console_domid xen/arch/arm/include/asm/setup.h | 2 - xen/arch/arm/setup.c | 2 - xen/arch/arm/vpl011.c | 7 +- xen/arch/ppc/include/asm/setup.h | 2 - xen/arch/riscv/include/asm/setup.h | 2 - xen/arch/x86/include/asm/setup.h | 2 - xen/arch/x86/pv/shim.c | 2 + xen/common/device-tree/dom0less-build.c | 2 - xen/common/domain.c | 31 +++++++ xen/drivers/char/console.c | 105 +++++++++++------------- xen/include/xen/console.h | 3 +- xen/include/xen/domain.h | 1 + xen/include/xen/sched.h | 8 +- 13 files changed, 94 insertions(+), 75 deletions(-) -- 2.34.1
