linux-kernel - [PATCH] xen: enable XEN_UNPOPULATED

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Message-ID: <20250514092037.28970-1-roger.pau@citrix.com>
Date: Wed, 14 May 2025 11:20:36 +0200
From: Roger Pau Monne <roger.pau@...rix.com>
To: xen-devel@...ts.xenproject.org,
	linux-kernel@...r.kernel.org
Cc: jason.andryuk@....com,
	Roger Pau Monne <roger.pau@...rix.com>,
	Juergen Gross <jgross@...e.com>,
	Stefano Stabellini <sstabellini@...nel.org>,
	Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
Subject: [PATCH] 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@...rix.com>
---
 kernel/configs/xen.config | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/configs/xen.config b/kernel/configs/xen.config
index 6878b9a49be8..1875a0a5047a 100644
--- 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
-- 
2.48.1