Per https://www.qemu.org/docs/master/devel/clocks.html#clock-multiplier-and-divider-settings:
Note that clock_set_mul_div() does not automatically call clock_propagate(). If you make a runtime change to the multiplier or divider you must call clock_propagate() yourself. Fix what we forgot to do that in recent commit ec7d83acbd ("hw/misc/stm32l4x5_rcc: Add an internal clock multiplexer object") Arnaud Minier (1): hw/misc/stm32l4x5_rcc: Propagate period when enabling a clock Philippe Mathieu-Daudé (1): hw/clock: Let clock_set_mul_div() return boolean value include/hw/clock.h | 4 +++- hw/core/clock.c | 8 +++++++- hw/misc/stm32l4x5_rcc.c | 5 ++++- 3 files changed, 14 insertions(+), 3 deletions(-) -- 2.41.0