Re: [PATCH 05/10] KVM: s390: add function unlink_gib_alert_list()

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On 25/10/2018 14:37, Michael Mueller wrote:
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>
---
  arch/s390/kvm/interrupt.c | 8 ++++++++
  1 file changed, 8 insertions(+)

diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index ce258d6b7c06..487cad95e2c9 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -2886,6 +2886,14 @@ 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)
+{
+	if (!gib)
+		return NULL;
+
+	return (void *)(u64) atomic_xchg(&gib->alert_list_origin, 0);
+}
+
  static void nullify_gisa(struct kvm_s390_gisa *gisa)
  {
  	memset(gisa, 0, sizeof(struct kvm_s390_gisa));


Reviewed-by: Pierre Morel<pmorel@xxxxxxxxxxxxx>

--
Pierre Morel
Linux/KVM/QEMU in Böblingen - Germany




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