On 06/06/2012 05:28 PM, Jan Kiszka wrote: > Due to a offset between the clock used to generate the in-kernel > count_load_time (CLOCK_MONOTONIC) and the clock used for processing this > in userspace (vm_clock), reading back the output of PIT channel 2 via > port 0x61 was broken. One use cases that suffered from it was the CPU > frequency calibration of SeaBIOS, which also affected IDE/AHCI timeouts. > > This fixes it by calibrating the offset between both clocks on > kvm_pit_get and adjusting the kernel value before saving it in the > userspace state. As the calibration only works while the vm_clock is > running, we cache the in-kernel state across stopped phases.
Applied, thanks. > + clock_offset = LLONG_MAX; INT64_MAX would me more strictly correct, but in practice it makes no difference. -- error compiling committee.c: too many arguments to function
