Facilitating hibernation mode transitions for virtual machines

1. A method, comprising:

responsive to determining, by a processing device of a host computer system, that an active user session exists in a virtual machine operating in a hibernation state on the host computer system, disabling modifications of a hardware configuration parameter of the virtual machine;

responsive to determining that the active user session has terminated, enabling modifications of the hardware configuration parameter of the virtual machine; and

responsive to determining the hardware configuration parameter of the virtual machine has been modified, causing the virtual machine to discard, upon awakening, a previously saved memory state.

2. The method of claim 1 , wherein disabling modifications of the hardware configuration parameter comprises causing deactivation of a user interface control employed for modifying the hardware configuration parameter.

3. The method of claim 1 , wherein a current state of the virtual machine is represented by an Advanced Configuration Power Interface (ACPI) S4 state.

4. The method of claim 1 , further comprising: detecting a transition into the hibernation state initiated by the virtual machine.

5. The method of claim 1 , wherein determining that the active user session exists further comprises receiving a signal indicative of a user login event from an application being executed by the virtual machine.

6. The method of claim 1 , wherein determining that the active user session exists further comprises tracking, by the host computer system, interactions by the virtual machine with a peripheral device.

7. The method of claim 1 , wherein determining that the active user session exists further comprises matching a pre-defined pattern to a message transmitted by a network interface controller associated with the virtual machine.

8. The method of claim 1 , wherein the hardware configuration parameter is represented by one of: a number of virtual processors associated with the virtual machine, a memory map associated with the virtual machine, or a configuration parameter of a peripheral device associated with the virtual machine.

9. A system, comprising:

a memory; and

a processing device coupled to the memory, the processing device configured to:

responsive to determining, by a processing device of a host computer system, that an active user session exists in a virtual machine operating in a hibernation state on the host computer system, disable modifications of a hardware configuration parameter of the virtual machine; and

responsive to determining that the active user session has terminated, enable modifications of the hardware configuration parameter of the virtual machine.

10. The system of claim 9 , wherein the processing device is further configured to:

responsive to determining the hardware configuration parameter of the virtual machine has been modified, cause the virtual machine to discard, upon awakening, a previously saved memory state.

11. The system of claim 9 , wherein disabling modifications of the hardware configuration parameter comprises causing deactivation of a user interface control employed for modifying the hardware configuration parameter.

12. The system of claim 9 , wherein a current state of the virtual machine is represented by an Advanced Configuration Power Interface (ACPI) S4 state.

13. The system of claim 9 , wherein the processing device is further configured to:

detect a transition into the hibernation state initiated by the virtual machine.

14. The system of claim 9 , wherein determining that the active user session exists further comprises receiving a signal indicative of a user login event from an application being executed by the virtual machine.

15. The system of claim 9 , wherein determining that the active user session exists further comprises tracking, by the host computer system, interactions by the virtual machine with a peripheral device.

16. The system of claim 9 , wherein determining that the active user session exists further comprises matching a pre-defined pattern to a message transmitted by a network interface controller associated with the virtual machine.

17. The system of claim 9 , wherein the hardware configuration parameter is represented by one of: a number of virtual processors associated with the virtual machine, a memory map associated with the virtual machine, or a configuration parameter of a peripheral device associated with the virtual machine.

18. A non-transitory computer-readable storage medium comprising executable instructions that, when executed by a processing device, cause the processing device to:

responsive to determining, by a processing device of a host computer system, that an active user session exists in a virtual machine operating in a hibernation state on the host computer system, disable modifications of a hardware configuration parameter of the virtual machine;

responsive to determining that the active user session has terminated, enable modifications of the hardware configuration parameter of the virtual machine; and

responsive to determining the hardware configuration parameter of the virtual machine has been modified, cause the virtual machine to discard, upon awakening, a previously saved memory state.

19. The non-transitory computer-readable storage medium of claim 18 , wherein a current state of the virtual machine is represented by an Advanced Configuration Power Interface (ACPI) S4 state.

20. The non-transitory computer-readable storage medium of claim 18 , wherein the hardware configuration parameter is represented by one of: a number of virtual processors associated with the virtual machine, a memory map associated with the virtual machine, or a configuration parameter of a peripheral device associated with the virtual machine.