On Wed, 7 Oct 2015 23:29:07 +0800 Yi Wang <up2w...@gmail.com> wrote: > Hi, all > When I create a vm using virsh, it will fail if maxMemory(2G) equals > to memory(2G) in XML: > error: Failed to create domain from vm1.xml > error: internal error: process exited while connecting to monitor: > qemu-kvm: -msg timestamp=on: invalid value of -m option maxmem: memory > slots were specified but maximum memory size (0x80000000) is equal to > the initial memory size (0x80000000) -m initial_memory[,slots=X,maxmem=Y]
By design 'initial_memory' is not hotplugable and slots,maxmem should be used if hotplug is needed and maxmem should be greater than initial_memory. There isn't point specifying maxmem == initial_memory (i.e. 0-sized hotplug space) and that's what QEMU is complaining about. > > However, if I allocate 1G memory for the guest at boot time(maxMemory > is still 2G), and then hotplug 1G to it, and it will success! Now > total memory is 2G and it equals to maxMemory. Is this a bug? if so, I > would be happy to work on a patch to fix this. Please tell me how this > designs if this is not a bug. > > Thanks a lot. >