diff options
Diffstat (limited to '0040-x86-pv-shim-correctly-ignore-empty-onlining-requests.patch')
| -rw-r--r-- | 0040-x86-pv-shim-correctly-ignore-empty-onlining-requests.patch | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/0040-x86-pv-shim-correctly-ignore-empty-onlining-requests.patch b/0040-x86-pv-shim-correctly-ignore-empty-onlining-requests.patch new file mode 100644 index 0000000..d242cb2 --- /dev/null +++ b/0040-x86-pv-shim-correctly-ignore-empty-onlining-requests.patch @@ -0,0 +1,43 @@ +From 08f6c88405a4406cac5b90e8d9873258dc445006 Mon Sep 17 00:00:00 2001 +From: Igor Druzhinin <igor.druzhinin@citrix.com> +Date: Mon, 31 Oct 2022 13:26:59 +0100 +Subject: [PATCH 40/87] 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 d9704121a739..4146ee3f9ce8 100644 +--- a/xen/arch/x86/pv/shim.c ++++ b/xen/arch/x86/pv/shim.c +@@ -944,6 +944,9 @@ 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 + |