[Xen-devel] Question about reserving one CPU for the Xen hypervisor in case of vm exit.

["Liang Yang" <multisyncfe991@xxxxxxxxxxx>]

Hi,

My platform has two dual-core processors with VT-x enabled. Suppose I use 
"xm vcpu-pin" command to set up a fixed mapping between each physical 
processor/core to virtual cpu (to avoid possible migration).
I have three domains, one is dom0, the second is domUP and the third is 
domUF (HVM domain). I give each domain one CPU and reserve one for 
hypervisor. What I want to do is to always keep one CPU idle (reserving it 
for VMM), Xen hyperviso can thus always use this idle CPU whenever a "vm 
exit" happens and the guest HVM domain still has its own CPU to do some 
overlapping processing (to improve performance).
Is this feasible?

Thanks,

Liang




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