[Libvir] [PATCH] Implement memory operations for qemu driver

[Cole Robinson]

Cole Robinson wrote:
> The attached patch implements the following operations for the qemu driver:
> 
> virDomainGetMaxMemory
> virDomainSetMaxMemory
> virDomainSetMemory
> 
> A few questions/comments:
> 
> 1) I changed maxmem and memory in the qemu_vm_def struct to unsigned long
>    to match the public api for memory values. Seems to work, but not sure
>    if there are any undesirable side effects to this.
> 
> 2) Should SetMaxMem be able to be called on a running guest? This code
>    allows it, since maxmem is basically a metavalue that doesn't directly
>    affect a guest.
> 
> 3) Should maxmem be able to be set lower than the currently allocated mem?
>    This code does not allow this. If this changed, would also need to take
>    into account how we would handle this if we can change the maxmem while
>    the guest is running. After rethinking, we probably should be able to
>    do this, but I haven't changed the code.
> 
> Thanks,
> Cole
> 

In testing this with virt-manager I found a bug: I was using comparing maxmem
against the wrong memory value. Fixed this and updated the parameter names
to be a bit more clear. Seems to work as excepted now.

Thanks,
Cole

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