[PATCH v2 06/12] KVM: s390: add function unlink_gib_alert_list()

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The function atomically returns the address of the first
GISA of this list and stores a zero address in the origin
list field of the GIB instead.

The GIB alert list contains all GISAs that have pending
adapter interruptions.

Signed-off-by: Michael Mueller <mimu@xxxxxxxxxxxxx>
Reviewed-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
---
 arch/s390/kvm/interrupt.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 56d431508435..fc9eae499319 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -2882,6 +2882,20 @@ int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
 	return n;
 }
 
+static struct kvm_s390_gisa __maybe_unused *unlink_gib_alert_list(void)
+{
+	u32 gisa;
+
+	if (!gib)
+		return NULL;
+
+	do {
+		gisa = READ_ONCE(gib->alert_list_origin);
+	} while (cmpxchg(&gib->alert_list_origin, gisa, 0) != gisa);
+
+	return (void *)(u64) gisa;
+}
+
 static void nullify_gisa(struct kvm_s390_gisa *gisa)
 {
 	memset(gisa, 0, sizeof(struct kvm_s390_gisa));
-- 
2.13.4




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