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Oracle VM: Fail to Start 32-bit PVM with error panic: xc_dom_boot.c:160: xc_dom_boot_mem_init: can't allocate low memory for domain (Doc ID 2445597.1)

Last updated on JULY 28, 2020

Applies to:

Oracle VM - Version 3.3.4 and later
Linux x86-64


There are two Oracle VM guests:

vm32 : 32bit, PVM, 12GB Memory

vm64 : 64bit, PVM, 160GB Memory

and one Oracle VM Server ovs1

total dom0 memory: 5.80 GB

total physical memory: 256 GB


32-bit PVM guests are restricted to using the low 128GB of OVM Server's physical memory.

When firstly starting 64-bit PVM with 160GB (larger than 128GB), the first 160GB is allocated on the machine address. Then starting 32-bit PVM guest will fail because 32-bit PVM guest can not map the address above 128GB.


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