For both hardware virtualized (HVM) guests and hardware virtualized guest with paravirtualized drivers (PVHVM), the possibility to change the number of virtual CPUs is limited by the kernel of the virtual machine. The table below provides an overview of guest kernel support; it applies to both x86 and x86_64 guest architectures.
Table 6.1 Guest kernel support for hot-changing virtual CPUs
Oracle Linux Version | Type | Kernel Version | Hot-Add | Hot-Remove |
|---|---|---|---|---|
Oracle Linux R5U5 | PVM | 2.6.18-194.0.0.0.3.el5xen | Yes | Yes |
Oracle Linux R5U5 | PVHVM | 2.6.18-194.0.0.0.3.el5 | No | No |
Oracle Linux R5U6 | PVM | 2.6.18-238.0.0.0.1.el5xen | Yes | Yes |
Oracle Linux R5U6 | PVHVM | 2.6.18-238.0.0.0.1.el5 | No | No |
Oracle Linux R5U7 | PVM | 2.6.32-200.13.1.el5uek | No | Yes |
Oracle Linux R5U7 | PVHVM | 2.6.32-200.13.1.el5uek | No | No |
Oracle Linux R5U8 | PVM | 2.6.32-300.10.1.el5uek | No | Yes |
Oracle Linux R5U8 | PVHVM | 2.6.32-300.10.1.el5uek | No | No |
Oracle Linux R6U1 | PVM | 2.6.32-100.34.1.el6uek | Yes | Yes |
Oracle Linux R6U1 | PVHVM | 2.6.32-100.34.1.el6uek | No | No |
Oracle Linux R6U2 | PVM | 2.6.32-300.3.1.el6uek | Yes | Yes |
Oracle Linux R6U2 | PVHVM | 2.6.32-300.3.1.el6uek | No | No |
Oracle Linux R5U8 with UEK2 | PVM | 2.6.39-100.5.1.el5uek | No | Yes |
Oracle Linux R5U8 with UEK2 | PVHVM | 2.6.39-100.5.1.el5uek | No | No |
Oracle Linux R6U2 with UEK2 | PVM | 2.6.39-100.5.1.el6uek | Yes | Yes |
Oracle Linux R6U2 with UEK2 | PVHVM | 2.6.39-100.5.1.el6uek | Yes | No |
Bugs 12913287, 13905845, 13823853, and 13898210