linux-kernel - [PATCH 3.2 004/164] KVM: s390: Zero out current VMDB of STSI before including level3 data.

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Message-ID: <lsq.1438473757.651409932@decadent.org.uk>
Date:	Sun, 02 Aug 2015 01:02:37 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"David Hildenbrand" <dahi@...ux.vnet.ibm.com>,
	"Christian Borntraeger" <borntraeger@...ibm.com>,
	"Ekaterina Tumanova" <tumanova@...ux.vnet.ibm.com>
Subject: [PATCH 3.2 004/164] KVM: s390: Zero out current VMDB of STSI
 before including level3 data.

3.2.70-rc1 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: Ben Hutchings <ben@...adent.org.uk>
---
 arch/s390/kvm/priv.c | 1 +
 1 file changed, 1 insertion(+)

--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -219,6 +219,7 @@ static void handle_stsi_3_2_2(struct kvm
 	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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