Re: Increasing domain memory beyond initial maxmem

[Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

On Thu, Mar 31, 2022 at 02:22:03PM +0200, Juergen Gross wrote:
> Maybe some kernel config differences, or other udev rules (memory onlining
> is done via udev in my guest)?
> 
> I'm seeing:
> 
> # zgrep MEMORY_HOTPLUG /proc/config.gz
> CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y
> CONFIG_MEMORY_HOTPLUG=y
> # CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE is not set
> CONFIG_XEN_BALLOON_MEMORY_HOTPLUG=y
> CONFIG_XEN_MEMORY_HOTPLUG_LIMIT=512

I have:
# zgrep MEMORY_HOTPLUG /proc/config.gz 
CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y
CONFIG_MEMORY_HOTPLUG=y
CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE=y
CONFIG_XEN_BALLOON_MEMORY_HOTPLUG=y
CONFIG_XEN_MEMORY_HOTPLUG_LIMIT=512

Not sure if relevant, but I also have:
CONFIG_XEN_UNPOPULATED_ALLOC=y

on top of that, I have a similar udev rule too:

SUBSYSTEM=="memory", ACTION=="add", ATTR{state}=="offline", ATTR{state}="online"

But I don't think they are conflicting.

> What type of guest are you using? Mine was a PVH guest.

PVH here too.

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab

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