Flexible Memory Appliance and Methods for Using Such

Various embodiments of the present invention provide systems and methods for using providing memory access across multiple virtual machines. For example, various embodiments of the present invention provide methods for configuring a shared main memory region. The methods include providing a memory appliance that includes a randomly accessible bank of memory and a memory controller that is operable to maintain information in relation to a first virtual machine and a second virtual machine. The methods further include receiving a request to allocate a first portion of the bank of memory to the first virtual machine, and receiving a request to allocate a second portion of the bank of memory to the second virtual machine. The first portion of the bank of memory is identified as accessible to the first virtual machine, and the second portion of the bank of memory is identified as accessible to the second virtual machine.