This is a note to let you know that I've just added the patch titled
x86/xen: don't reset vcpu_info on a cancelled suspend
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-xen-don-t-reset-vcpu_info-on-a-cancelled-suspend.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6a1f513776b78c994045287073e55bae44ed9f8c Mon Sep 17 00:00:00 2001
From: "Ouyang Zhaowei (Charles)" <ouyangzhaowei@xxxxxxxxxx>
Date: Wed, 6 May 2015 09:47:04 +0800
Subject: x86/xen: don't reset vcpu_info on a cancelled suspend
From: "Ouyang Zhaowei (Charles)" <ouyangzhaowei@xxxxxxxxxx>
commit 6a1f513776b78c994045287073e55bae44ed9f8c upstream.
On a cancelled suspend the vcpu_info location does not change (it's
still in the per-cpu area registered by xen_vcpu_setup()). So do not
call xen_hvm_init_shared_info() which would make the kernel think its
back in the shared info. With the wrong vcpu_info, events cannot be
received and the domain will hang after a cancelled suspend.
Signed-off-by: Charles Ouyang <ouyangzhaowei@xxxxxxxxxx>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/xen/suspend.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/x86/xen/suspend.c
+++ b/arch/x86/xen/suspend.c
@@ -34,7 +34,8 @@ static void xen_hvm_post_suspend(int sus
{
#ifdef CONFIG_XEN_PVHVM
int cpu;
- xen_hvm_init_shared_info();
+ if (!suspend_cancelled)
+ xen_hvm_init_shared_info();
xen_callback_vector();
xen_unplug_emulated_devices();
if (xen_feature(XENFEAT_hvm_safe_pvclock)) {
Patches currently in stable-queue which might be from ouyangzhaowei@xxxxxxxxxx are
queue-4.4/x86-xen-don-t-reset-vcpu_info-on-a-cancelled-suspend.patch
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