On virtual systems under Xen, the kernel does not correctly calculate the total amount of memory. This results in the system having slightly less memory available for use than the actual amount provided by Xen.
[Test Case]
Load a virtual Xen guest with the latest precise (3.2) kernel, and notice that its total memory is less than what is allocated in the Xen configuration. Also possible is to load a virtual Xen guest, with the exact same Xen guest config/parameters, with the latest trusty (3.13) kernel; on trusty and later, the total amount of memory is correctly detected.
[Impact]
On virtual systems under Xen, the kernel does not correctly calculate the total amount of memory. This results in the system having slightly less memory available for use than the actual amount provided by Xen.
[Test Case]
Load a virtual Xen guest with the latest precise (3.2) kernel, and notice that its total memory is less than what is allocated in the Xen configuration. Also possible is to load a virtual Xen guest, with the exact same Xen guest config/parameters, with the latest trusty (3.13) kernel; on trusty and later, the total amount of memory is correctly detected.
[Regression Potential]
None known.