linux-kernel - [PATCH 3.16.y-ckt 052/180] KVM: s390: Zero out current VMDB of STSI before including level3 data.

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Message-Id: <1430991989-23170-53-git-send-email-luis.henriques@canonical.com>
Date:	Thu,  7 May 2015 10:44:21 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Ekaterina Tumanova <tumanova@...ux.vnet.ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 052/180] KVM: s390: Zero out current VMDB of STSI before including level3 data.

3.16.7-ckt11 -stable review patch.  If anyone has any objections, please let me know.

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

From: Ekaterina Tumanova <tumanova@...ux.vnet.ibm.com>

commit b75f4c9afac2604feb971441116c07a24ecca1ec upstream.

s390 documentation requires words 0 and 10-15 to be reserved and stored as
zeros. As we fill out all other fields, we can memset the full structure.

Signed-off-by: Ekaterina Tumanova <tumanova@...ux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@...ux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 arch/s390/kvm/priv.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index 9f41229df1aa..3d2e3b7c50db 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -470,6 +470,7 @@ static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
 	for (n = mem->count - 1; n > 0 ; n--)
 		memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
 
+	memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
 	mem->vm[0].cpus_total = cpus;
 	mem->vm[0].cpus_configured = cpus;
 	mem->vm[0].cpus_standby = 0;
--
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