From e63414078a7dd7ac08dc916af04f01c90d01c875 Mon Sep 17 00:00:00 2001
From: Aaron Andersen <aaron@fosslib.net>
Date: Wed, 16 Jan 2019 19:58:08 +0000
Subject: [PATCH] Enable memory hotplug support

---
 pkgs/os-specific/linux/kernel/common-config.nix | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/pkgs/os-specific/linux/kernel/common-config.nix b/pkgs/os-specific/linux/kernel/common-config.nix
index ab4b1cc2fc96..4e23e533433b 100644
--- a/pkgs/os-specific/linux/kernel/common-config.nix
+++ b/pkgs/os-specific/linux/kernel/common-config.nix
@@ -686,6 +686,14 @@ let
       HOTPLUG_PCI_ACPI = yes; # PCI hotplug using ACPI
       HOTPLUG_PCI_PCIE = yes; # PCI-Expresscard hotplug support
 
+      # Enable memory hotplug support
+      # Allows you to dynamically add & remove memory to a VM client running NixOS without requiring a reboot
+      ACPI_HOTPLUG_MEMORY = yes;
+      MEMORY_HOTPLUG = yes;
+      MEMORY_HOTREMOVE = yes;
+      MIGRATION = yes;
+      SPARSEMEM = yes;
+
     } // optionalAttrs (stdenv.hostPlatform.system == "x86_64-linux" || stdenv.hostPlatform.system == "aarch64-linux") {
       # Bump the maximum number of CPUs to support systems like EC2 x1.*
       # instances and Xeon Phi.