Offset guest time from host time sufficiently to hide the cost of
running in the virtual machine. This can aid the consistency of
time between multiple timers, but can cause the guest to run
- slightly slower than the host.
-
-config TIME_HIDE_EXIT_COST
- bool "Hide VMM Exit Cost"
- default n
- depends on TIME_HIDE_VM_COST
- help
- Add additional TSC offset to hide VMM exit costs from the guest.
-
-config TIME_EXIT_COST_ADJUST
- int "Exit cost adjustment for hiding VM exits"
- default 2000
- depends on TIME_HIDE_EXIT_COST
- help
- Amount to adjust the time to hide the exit cost of fully virtualizing
- the timestamp counter. Used to hide the cost of fully virtualizing
- the TSC for OSes that assume that reading the TSC is inexpensive
- (e.g. Linux TSC-based timer calibration).
+ a good bit slower than the host in VM-intensive parts of the code.
config TIME_VIRTUALIZE_TSC
bool "Fully virtualize guest TSC"
