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Notify the host (via a PV mechanism) to indicate that an error has occurred within the guest. Introduce code in Linux to use this notification mechanism.


Detailed Summary

Very often when a guest crash, lockup, or warning occurs, the guest is aware enough to print a message to the console to alert the user. When this happens, it might be useful to trigger some action on the host such as gathering usage statistics of other VMs. Today, the host has no insight into when a guest has a problem but this could be easily addressed by paravirtualizing a guest.