[Xen-bugs] [Bug 592] New: Para-virtualized Linux memory size cannot be successfully increased

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=592

           Summary: Para-virtualized Linux memory size cannot be
                    successfully increased
           Product: Xen
           Version: unstable
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Guest-OS
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: john.l.byrne@xxxxxx


If you start a para-virtualized Linux with "memory = 128" and "maxmem = 256" in
the config file, if you do a "xm mem-set domain 256" later, Linux doesn't see
the memory. It looks as if maxmem is never passed to the para-virtualized guest.
If you add the "mem=256M" to the kernel command line, /proc/xen/balloon seems to
indicate that it is ready to do the right thing ("Current allocation" and
"Requested target" are both approximately 128M  has approximately 128M on
"Low-mem balloon "list), but when you try to do a "xm mem-set 256", the
"Requested target" goes to 256M, but the "Xen hard limit" is hit and "Current
allocation" is essentially unchanged.

Behavior on x86_64 is slightly different in that the "Low-free balloon" is zero
even if the "mem=" keyword is specified.

All tests were on SuSE xen 3.0.2_09434-0.

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