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From a46f01fad17173afe3809ac1980cbe4b67a9a8b5 Mon Sep 17 00:00:00 2001
From: Igor Druzhinin <igor.druzhinin@citrix.com>
Date: Mon, 31 Oct 2022 13:37:17 +0100
Subject: [PATCH 080/126] x86/pv-shim: correctly ignore empty onlining requests
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Mem-op requests may have zero extents. Such requests need treating as
no-ops. pv_shim_online_memory(), however, would have tried to take 2³²-1
order-sized pages from its balloon list (to then populate them),
typically ending when the entire set of ballooned pages of this order
was consumed.
Note that pv_shim_offline_memory() does not have such an issue.
Fixes: b2245acc60c3 ("xen/pvshim: memory hotplug")
Signed-off-by: Igor Druzhinin <igor.druzhinin@citrix.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
master commit: 9272225ca72801fd9fa5b268a2d1c5adebd19cd9
master date: 2022-10-28 15:47:59 +0200
---
xen/arch/x86/pv/shim.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/xen/arch/x86/pv/shim.c b/xen/arch/x86/pv/shim.c
index b4e83e077891..104357e2c398 100644
--- a/xen/arch/x86/pv/shim.c
+++ b/xen/arch/x86/pv/shim.c
@@ -922,6 +922,9 @@ void pv_shim_online_memory(unsigned int nr, unsigned int order)
struct page_info *page, *tmp;
PAGE_LIST_HEAD(list);
+ if ( !nr )
+ return;
+
spin_lock(&balloon_lock);
page_list_for_each_safe ( page, tmp, &balloon )
{
--
2.37.4
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