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...interrupt. This method for determining a cycle counter frequency is unreliable on virtual hardware since the VCPU may be preempted by the hypervisor during this calculation. Instead, the VMI Time device determines the frequency of the VMI cycle counters by querying the VMI. 2) The timer_irq_works() algorithm is problematic in a virtual environment for various reasons, and is avoided. When running on a hypervisor, the kernel can assume that the alarm will be wired up correctly to the interrupt controller and this logic is avoided altogether. 3) Rather than keeping kernel...

...interrupt. This method for determining a cycle counter frequency is unreliable on virtual hardware since the VCPU may be preempted by the hypervisor during this calculation. Instead, the VMI Time device determines the frequency of the VMI cycle counters by querying the VMI. 2) The timer_irq_works() algorithm is problematic in a virtual environment for various reasons, and is avoided. When running on a hypervisor, the kernel can assume that the alarm will be wired up correctly to the interrupt controller and this logic is avoided altogether. 3) Rather than keeping kernel...