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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 simple 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?

OR

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 these allocation differ in xen,kvm and vmware?

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closed as not constructive by Zoredache, Michael Hampton, MadHatter, HopelessN00b, mdpc Nov 12 '12 at 17:40

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wouldn't be easier for you to search in google to find the answer, because it's a complex topic ...? –  golja Nov 12 '12 at 8:19
    
Is the above question close to the way virtualization handles memory? –  Kevin Parker Nov 12 '12 at 10:13
    
@golja If u can't explain it simply then you dont understand it well enough-Einstein :) –  Kevin Parker Nov 15 '12 at 10:51
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