From: David Hildenbrand <dahi@linux.vnet.ibm.com>
Date: Tue, 24 Nov 2015 12:47:13 +0000 (+0100)
Subject: KVM: s390: guestdbg: signal missing hardware support
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=89b5b4de33902a57cb9c8f2d06de4ffbc921de15;p=linux-beck.git

KVM: s390: guestdbg: signal missing hardware support

Without guest-PER enhancement, we can't provide any debugging support.
Therefore act like kernel support is missing.

Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
---

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index efb902cdd1d2..e477c8e5b5c1 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2179,6 +2179,8 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 
 	if (dbg->control & ~VALID_GUESTDBG_FLAGS)
 		return -EINVAL;
+	if (!sclp.has_gpere)
+		return -EINVAL;
 
 	if (dbg->control & KVM_GUESTDBG_ENABLE) {
 		vcpu->guest_debug = dbg->control;