summaryrefslogtreecommitdiff
path: root/arch/s390/kvm
diff options
context:
space:
mode:
authorDavid Hildenbrand <dahi@linux.vnet.ibm.com>2015-11-24 16:41:33 +0100
committerChristian Borntraeger <borntraeger@de.ibm.com>2016-06-21 09:43:41 +0200
commita1b7b9b286c0157748922526ecb353e550209833 (patch)
tree7e98809dbbada365383b55ace9731145551251e5 /arch/s390/kvm
parent77d18f6d47fbeaaceb15df9ab928757d5bb96ec6 (diff)
KVM: s390: vsie: support guest-storage-limit-suppression
We can easily forward guest-storage-limit-suppression if available. One thing to care about is keeping the prefix properly mapped when gsls in toggled on/off or the mso changes in between. Therefore we better remap the prefix on any mso changes just like we already do with the prefix. Acked-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>
Diffstat (limited to 'arch/s390/kvm')
-rw-r--r--arch/s390/kvm/kvm-s390.c2
-rw-r--r--arch/s390/kvm/vsie.c7
2 files changed, 7 insertions, 2 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 175752877c0d..ce9813afd502 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -271,6 +271,8 @@ static void kvm_s390_cpu_feat_init(void)
allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF);
if (sclp.has_gpere)
allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE);
+ if (sclp.has_gsls)
+ allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS);
}
int kvm_arch_init(void *opaque)
diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c
index b8792ef01030..ea65bf2f0201 100644
--- a/arch/s390/kvm/vsie.c
+++ b/arch/s390/kvm/vsie.c
@@ -109,6 +109,8 @@ static int prepare_cpuflags(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
}
if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_GPERE))
newflags |= cpuflags & CPUSTAT_P;
+ if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_GSLS))
+ newflags |= cpuflags & CPUSTAT_SM;
atomic_set(&scb_s->cpuflags, newflags);
return 0;
@@ -242,7 +244,7 @@ static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
bool had_tx = scb_s->ecb & 0x10U;
- unsigned long new_mso;
+ unsigned long new_mso = 0;
int rc;
/* make sure we don't have any leftovers when reusing the scb */
@@ -284,7 +286,8 @@ static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
scb_s->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
scb_s->icpua = scb_o->icpua;
- new_mso = scb_o->mso & 0xfffffffffff00000UL;
+ if (!(atomic_read(&scb_s->cpuflags) & CPUSTAT_SM))
+ new_mso = scb_o->mso & 0xfffffffffff00000UL;
/* if the hva of the prefix changes, we have to remap the prefix */
if (scb_s->mso != new_mso || scb_s->prefix != scb_o->prefix)
prefix_unmapped(vsie_page);