Re: [PATCH 1/1] powerpc/kernel: Enables memory hot-remove after reboot on pseries guests

[Leonardo Bras]

On Wed, 2020-03-04 at 04:18 -0300, Leonardo Bras wrote:
> Humm, this makes sense.
> But with mu change, these pieces of memory only get into ZONE_MOVABLE
> if the boot parameter 'movable_node' gets passed to guest kernel. 

Humm, I think your patch also does that.

> So, even if we are unable to sort out some flag combination that work
> fine for both use-cases, if PowerVM don't pass 'movable_node' as boot
> parameter to kernel, it will behave just as today.

Also, another option would be adding a new 'removable' flag, given it
has a lot of free bytes. It would only be passed by qemu, so we would
be safe with PowerVM. 

Then we would have 
+	if(lmb->flags & DRCONF_MEM_REMOVABLE)	
+		early_init_dt_mark_hotplug_memory_arch(base, size);

Do you know if it's possible?
We would need to update the LOPAPR? 

Leonardo

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