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authorChristian Borntraeger <borntraeger@de.ibm.com>2017-11-21 18:02:52 +0300
committerChristian Borntraeger <borntraeger@de.ibm.com>2017-12-06 11:18:43 +0300
commitbb64da9aba89765fee74b395967b18a7d6c364e9 (patch)
treec3499d7eaece67a6be01d01490c78b7ffe875e89 /arch
parent940f89a5a37789b94f332755767c556a64b004e4 (diff)
downloadlinux-bb64da9aba89765fee74b395967b18a7d6c364e9.tar.xz
KVM: s390: mark irq_state.flags as non-usable
Old kernels did not check for zero in the irq_state.flags field and old QEMUs did not zero the flag/reserved fields when calling KVM_S390_*_IRQ_STATE. Let's add comments to prevent future uses of these fields. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: David Hildenbrand <david@redhat.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/kvm/kvm-s390.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 34375eed93ee..efa439f6ffb3 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -1,8 +1,8 @@
// SPDX-License-Identifier: GPL-2.0
/*
- * hosting zSeries kernel virtual machines
+ * hosting IBM Z kernel virtual machines (s390x)
*
- * Copyright IBM Corp. 2008, 2009
+ * Copyright IBM Corp. 2008, 2017
*
* Author(s): Carsten Otte <cotte@de.ibm.com>
* Christian Borntraeger <borntraeger@de.ibm.com>
@@ -3808,6 +3808,7 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
r = -EINVAL;
break;
}
+ /* do not use irq_state.flags, it will break old QEMUs */
r = kvm_s390_set_irq_state(vcpu,
(void __user *) irq_state.buf,
irq_state.len);
@@ -3823,6 +3824,7 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
r = -EINVAL;
break;
}
+ /* do not use irq_state.flags, it will break old QEMUs */
r = kvm_s390_get_irq_state(vcpu,
(__u8 __user *) irq_state.buf,
irq_state.len);