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Forcing registered code into an execution context of guest software

  • US 8,250,519 B2
  • Filed: 08/08/2008
  • Issued: 08/21/2012
  • Est. Priority Date: 08/08/2007
  • Status: Active Grant
First Claim
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1. A method of operating a virtualization system, the method comprising:

  • executing guest software in a virtual machine of the virtualization system, the virtualization system including virtualization software configured to coordinate execution, on an underlying hardware machine, of instruction sequences that correspond to respective execution contexts of the guest software, the guest software being less privileged than the virtualization software;

    performing an upcall from the virtualization software into an execution context of the guest software, the upcall causing a transfer of control to an instruction sequence of registered code from the virtualization software into the guest software;

    forcing execution of the registered code into the execution context of the guest software; and

    executing the registered code in the execution context of the guest software based on the upcall.

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