linux-kernel - [PATCH 4.1 45/56] KVM: s390: clear floating interrupt bitmap and parameters

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Date:	Wed,  8 Jul 2015 00:35:34 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Jens Freimann <jfrei@...ux.vnet.ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH 4.1 45/56] KVM: s390: clear floating interrupt bitmap and parameters

4.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jens Freimann <jfrei@...ux.vnet.ibm.com>

commit f2ae45edbca7ba5324eef01719ede0151dc5cead upstream.

commit 6d3da24141 ("KVM: s390: deliver floating interrupts in order
of priority") introduced a regression for the reset handling.

We don't clear the bitmap of pending floating interrupts
and interrupt parameters. This could result in stale interrupts
even after a reset. Let's fix this by clearing the pending bitmap
and the parameters for service and machine check interrupts.

Signed-off-by: Jens Freimann <jfrei@...ux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/s390/kvm/interrupt.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -1606,6 +1606,9 @@ void kvm_s390_clear_float_irqs(struct kv
 	int i;
 
 	spin_lock(&fi->lock);
+	fi->pending_irqs = 0;
+	memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
+	memset(&fi->mchk, 0, sizeof(fi->mchk));
 	for (i = 0; i < FIRQ_LIST_COUNT; i++)
 		clear_irq_list(&fi->lists[i]);
 	for (i = 0; i < FIRQ_MAX_COUNT; i++)


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