[vbox-dev] Announcement: VirtualBox 5.0 Beta 1 released

Ramshankar ramshankar.venkataraman at oracle.com
Thu Apr 2 09:18:48 UTC 2015

On 04/ 1/15 09:16 PM, Alexey Eromenko wrote:
> Basically VirtualBox is going to implement ABI compatible with Hyper V and
> with KVM on the host side.

Correct. At present, this is providing paravirtualized clock support and 
a little bit more like spinlocks for KVM guests.

With Hyper-V provider, this should also result in relaxing timer checks 
within Windows guests, so BSODs like "A clock interrupt was not received 
on a secondary processor within the allocated time interval" would be 

This also results in slightly less overhead by not having to intercept 
any guest RDTSC instructions by the hypervisor once the guest has 
started using the paravirtualized clocks. However, these are difficult 
to benchmark; you would need very specific workloads triggering a huge 
amount of TSC reads on SMP VMs.


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