You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
72 lines
2.4 KiB
72 lines
2.4 KiB
From 5266b8e4445cc836c46689d80a9ff539fa3bfbda Mon Sep 17 00:00:00 2001
|
|
From: Juergen Gross <jgross@suse.com>
|
|
Date: Thu, 26 Oct 2017 11:50:56 +0200
|
|
Subject: [PATCH] xen: fix booting ballooned down hvm guest
|
|
|
|
Commit 96edd61dcf44362d3ef0bed1a5361e0ac7886a63 ("xen/balloon: don't
|
|
online new memory initially") introduced a regression when booting a
|
|
HVM domain with memory less than mem-max: instead of ballooning down
|
|
immediately the system would try to use the memory up to mem-max
|
|
resulting in Xen crashing the domain.
|
|
|
|
For HVM domains the current size will be reflected in Xenstore node
|
|
memory/static-max instead of memory/target.
|
|
|
|
Additionally we have to trigger the ballooning process at once.
|
|
|
|
Cc: <stable@vger.kernel.org> # 4.13
|
|
Fixes: 96edd61dcf44362d3ef0bed1a5361e0ac7886a63 ("xen/balloon: don't
|
|
online new memory initially")
|
|
|
|
Reported-by: Simon Gaiser <hw42@ipsumj.de>
|
|
Suggested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
|
|
Signed-off-by: Juergen Gross <jgross@suse.com>
|
|
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
|
|
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
|
|
---
|
|
drivers/xen/xen-balloon.c | 19 +++++++++++++------
|
|
1 file changed, 13 insertions(+), 6 deletions(-)
|
|
|
|
diff --git a/drivers/xen/xen-balloon.c b/drivers/xen/xen-balloon.c
|
|
index e89136ab851e..b437fccd4e62 100644
|
|
--- a/drivers/xen/xen-balloon.c
|
|
+++ b/drivers/xen/xen-balloon.c
|
|
@@ -57,7 +57,7 @@ static int register_balloon(struct device *dev);
|
|
static void watch_target(struct xenbus_watch *watch,
|
|
const char *path, const char *token)
|
|
{
|
|
- unsigned long long new_target;
|
|
+ unsigned long long new_target, static_max;
|
|
int err;
|
|
static bool watch_fired;
|
|
static long target_diff;
|
|
@@ -72,13 +72,20 @@ static void watch_target(struct xenbus_watch *watch,
|
|
* pages. PAGE_SHIFT converts bytes to pages, hence PAGE_SHIFT - 10.
|
|
*/
|
|
new_target >>= PAGE_SHIFT - 10;
|
|
- if (watch_fired) {
|
|
- balloon_set_new_target(new_target - target_diff);
|
|
- return;
|
|
+
|
|
+ if (!watch_fired) {
|
|
+ watch_fired = true;
|
|
+ err = xenbus_scanf(XBT_NIL, "memory", "static-max", "%llu",
|
|
+ &static_max);
|
|
+ if (err != 1)
|
|
+ static_max = new_target;
|
|
+ else
|
|
+ static_max >>= PAGE_SHIFT - 10;
|
|
+ target_diff = xen_pv_domain() ? 0
|
|
+ : static_max - balloon_stats.target_pages;
|
|
}
|
|
|
|
- watch_fired = true;
|
|
- target_diff = new_target - balloon_stats.target_pages;
|
|
+ balloon_set_new_target(new_target - target_diff);
|
|
}
|
|
static struct xenbus_watch target_watch = {
|
|
.node = "memory/target",
|
|
--
|
|
2.15.0.rc2
|
|
|