This is a note to let you know that I've just added the patch titled
KVM: s390: floating irqs: fix user triggerable endless loop
to the 3.18-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:
kvm-s390-floating-irqs-fix-user-triggerable-endless-loop.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8e2207cdd087ebb031e9118d1fd0902c6533a5e5 Mon Sep 17 00:00:00 2001
From: David Hildenbrand <dahi@xxxxxxxxxxxxxxxxxx>
Date: Thu, 15 Jan 2015 17:56:18 +0100
Subject: KVM: s390: floating irqs: fix user triggerable endless loop
From: David Hildenbrand <dahi@xxxxxxxxxxxxxxxxxx>
commit 8e2207cdd087ebb031e9118d1fd0902c6533a5e5 upstream.
If a vm with no VCPUs is created, the injection of a floating irq
leads to an endless loop in the kernel.
Let's skip the search for a destination VCPU for a floating irq if no
VCPUs were created.
Reviewed-by: Dominik Dingel <dingel@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
Signed-off-by: David Hildenbrand <dahi@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/s390/kvm/interrupt.c | 2 ++
1 file changed, 2 insertions(+)
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -850,6 +850,8 @@ static int __inject_vm(struct kvm *kvm,
list_add_tail(&inti->list, &iter->list);
}
atomic_set(&fi->active, 1);
+ if (atomic_read(&kvm->online_vcpus) == 0)
+ goto unlock_fi;
sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
if (sigcpu == KVM_MAX_VCPUS) {
do {
Patches currently in stable-queue which might be from dahi@xxxxxxxxxxxxxxxxxx are
queue-3.18/kvm-s390-base-hrtimer-on-a-monotonic-clock.patch
queue-3.18/kvm-s390-floating-irqs-fix-user-triggerable-endless-loop.patch
queue-3.18/kvm-s390-forward-hrtimer-if-guest-ckc-not-pending-yet.patch
queue-3.18/kvm-s390-avoid-memory-leaks-if-__inject_vm-fails.patch
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