Method and system for a guest physical address...

Details Method and system for a guest physical address... Method and system for a guest physical address...

G - Physics

06

F

G06F 9/46 (2006.01) G06F 9/455 (2006.01) G06F 12/02 (2006.01)

Patent

CA 2535484

A method of sharing pages between virtual machines in a multiple virtual machine environment includes initially allocating a temporary guest physical address range of a first virtual machine for sharing pages with a second virtual machine. The temporary range is within a guest physical address space of the first virtual machine. An access request, such as with a DMA request, from a second virtual machine for pages available to the first virtual machine is received. A reference count of pending accesses to the pages is incremented to indicate a pending access and the ages are mapped into the temporary guest physical address range. The pages are accessed and the reference count is decremented. The mapping in the temporary guest physical address range is then removed if the reference count is zero.

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