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[Xen-users] How do VM gets RAM from Hypervisor

In Virtualization how do all the vm gets RAM?

Does the Hypervisor allocate a portion of its RAM to each VM so that they can simply use it as its own RAM?
Lets say if a host machine has 8 GB RAM and there are 3 VM each 2GB.So is it like Hyperviosr logically splits RAM as portion of 2Gb each and allocate to VM?


Is it like memory is not shared among vm but based on request call from vm,hypervisor gives access to its memory pages?

How do RAM allocation differ in HVM and paravirtualization.Can any one please help me in this?

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