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I use Redhat Enterprise Linux 6 as the hypervisor to run virtual machine. The KVM guest OS is Windows 7. If I change the clock in Redhat, Windows may hang, and I can't move mouse in Windows desktop. (If I only set clock to be several minutes faster, then there is no problems. If I set it to be one day faster, then the problem occurs.)

Does anyone know why it happens? Is it related to KVM scheduling issue?

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Maybe it triggered a kernel bug on real-time clock? Afterall BIOS time does not normally change itself without going through the OS and many OS kernels rely on the real-time clock to achieve preemptive scheduling. Maybe you can file a bug with KVM and ask them to implement a time shift feature? – billc.cn Aug 13 '11 at 3:19
Maybe it's the time shift issue. VMWare seems not have this problem. – flypen Aug 17 '11 at 2:32
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Are you changing the clock while the VM is running?

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Yes, I am changing the clock while the VM is running. – flypen Aug 16 '11 at 6:13
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