xen: enable XEN_UNPOPULATED_ALLOC as part of xen.config

PVH dom0 is useless without XEN_UNPOPULATED_ALLOC, as otherwise it will
very likely balloon out all dom0 memory to map foreign and grant pages.

Enable it by default as part of xen.config.  This also requires enabling
MEMORY_HOTREMOVE and ZONE_DEVICE.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Message-ID: <20250514092037.28970-1-roger.pau@citrix.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

diff --git a/kernel/configs/xen.config b/kernel/configs/xen.config
index 6878b9a49be8d442f01c5ffb28e27bf413d28fd0..1875a0a5047ac971b8faa9ad5a48494224252041 100644 (file)
--- a/kernel/configs/xen.config
+++ b/kernel/configs/xen.config
@@ -13,6 +13,8 @@ CONFIG_SCSI=y
 CONFIG_FB=y
 CONFIG_INPUT_MISC=y
 CONFIG_MEMORY_HOTPLUG=y
+CONFIG_MEMORY_HOTREMOVE=y
+CONFIG_ZONE_DEVICE=y
 CONFIG_TTY=y
 # Technically not required but otherwise produces
 # pretty useless systems starting from allnoconfig
@@ -47,3 +49,4 @@ CONFIG_XEN_GNTDEV=m
 CONFIG_XEN_GRANT_DEV_ALLOC=m
 CONFIG_SWIOTLB_XEN=y
 CONFIG_XEN_PRIVCMD=m
+CONFIG_XEN_UNPOPULATED_ALLOC=y