From: Christian Borntraeger <borntraeger@de.ibm.com>
Date: Tue, 29 Jul 2008 21:48:42 +0000 (+0200)
Subject: KVM: s390: Fix kvm on IBM System z10
X-Git-Tag: firefly_0821_release~18474^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=1f4170e12db06fdde5279d665a7e6e2976b2b623;p=firefly-linux-kernel-4.4.55.git

KVM: s390: Fix kvm on IBM System z10

The z10 system supports large pages, kvm-s390 doesnt.
Make sure that we dont advertise large pages to avoid the guest crashing as
soon as the guest kernel activates DAT.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
---

diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index 2e2d2ffb6a07..d1faf5c54405 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -158,6 +158,7 @@ static int handle_stfl(struct kvm_vcpu *vcpu)
 
 	vcpu->stat.instruction_stfl++;
 	facility_list &= ~(1UL<<24); /* no stfle */
+	facility_list &= ~(1UL<<23); /* no large pages */
 
 	rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list),
 			   &facility_list, sizeof(facility_list));