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
