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| author | Collin L. Walling <walling@linux.vnet.ibm.com> | 2016-07-26 15:29:44 -0400 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2017-08-29 15:15:54 +0200 |
| commit | 8fa1696ea78162ca3112a26879d9379483443c85 (patch) | |
| tree | 3930f3b5b7b71e39dd8117c87704392b7badc840 /arch/s390/kvm/vsie.c | |
| parent | b697e435aeee99b7f5b2d8f8dbb51f791be99b16 (diff) | |
| download | lwn-8fa1696ea78162ca3112a26879d9379483443c85.tar.gz lwn-8fa1696ea78162ca3112a26879d9379483443c85.zip | |
KVM: s390: Multiple Epoch Facility support
Allow for the enablement of MEF and the support for the extended
epoch in SIE and VSIE for the extended guest TOD-Clock.
A new interface is used for getting/setting a guest's extended TOD-Clock
that uses a single ioctl invocation, KVM_S390_VM_TOD_EXT. Since the
host time is a moving target that might see an epoch switch or STP sync
checks we need an atomic ioctl and cannot use the exisiting two
interfaces. The old method of getting and setting the guest TOD-Clock is
still retained and is used when the old ioctls are called.
Signed-off-by: Collin L. Walling <walling@linux.vnet.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Reviewed-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/kvm/vsie.c')
| -rw-r--r-- | arch/s390/kvm/vsie.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c index 715c19c45d9a..d471910bd9ea 100644 --- a/arch/s390/kvm/vsie.c +++ b/arch/s390/kvm/vsie.c @@ -349,6 +349,9 @@ static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) scb_s->eca |= scb_o->eca & ECA_IB; if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_CEI)) scb_s->eca |= scb_o->eca & ECA_CEI; + /* Epoch Extension */ + if (test_kvm_facility(vcpu->kvm, 139)) + scb_s->ecd |= scb_o->ecd & ECD_MEF; prepare_ibc(vcpu, vsie_page); rc = shadow_crycb(vcpu, vsie_page); @@ -919,6 +922,13 @@ static void register_shadow_scb(struct kvm_vcpu *vcpu, */ preempt_disable(); scb_s->epoch += vcpu->kvm->arch.epoch; + + if (scb_s->ecd & ECD_MEF) { + scb_s->epdx += vcpu->kvm->arch.epdx; + if (scb_s->epoch < vcpu->kvm->arch.epoch) + scb_s->epdx += 1; + } + preempt_enable(); } |