Windows VMM/Host switching code

dsehr · Post by **dsehr** » 4. Feb 2009, 21:45

Hello,

I don't know if this is the right forum to ask this question, but here goes.

I gather that VirtualBox installs code to save and restore guest ring 0 state on host context switches, etc. I have found where VirtualBox saves and restores the guest ring 0 state. I could use a pointer to how VirtualBox registers the save/restore code, as it does not seem to be done in the device driver, as I would have expected.

Any suggestions where to look?

Thanks in advance.

David

Post by **Sasquatch** » 4. Feb 2009, 22:00

Are you asking where the machine state is stored when you save it's state as a shutdown? That's in the VM folder. There will be a .sav file in the snapshots folder. That file is restored when the VM is resumed.

dsehr · Post by **dsehr** » 5. Feb 2009, 00:27

Actually, I'm more looking for an overview of the SW architecture and pointers to the code that sets up the register saving and restoring when transitioning between the virtual machines and the host OS.

Thanks again,

David