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KVM: s390: ucontrol: disable sca

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This patch makes sure user controlled virtual machines do not use a
system control area (sca). This is needed in order to create
virtual machines with more cpus than the size of the sca [64].

Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Carsten Otte 2012-01-04 10:25:27 +01:00 committed by Avi Kivity
parent ccc7910fe5
commit 58f9460ba1
1 changed files with 20 additions and 10 deletions
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18
arch/s390/kvm/kvm-s390.c
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@ -228,10 +228,13 @@ out_err:
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
VCPU_EVENT(vcpu, 3, "%s", "free cpu");
clear_bit(63 - vcpu->vcpu_id, (unsigned long *) &vcpu->kvm->arch.sca->mcn);
if (!kvm_is_ucontrol(vcpu->kvm)) {
clear_bit(63 - vcpu->vcpu_id,
(unsigned long *) &vcpu->kvm->arch.sca->mcn);
if (vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda ==
(__u64) vcpu->arch.sie_block)
vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda = 0;
}
smp_mb();
if (kvm_is_ucontrol(vcpu->kvm))
@ -368,12 +371,19 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
goto out_free_cpu;
vcpu->arch.sie_block->icpua = id;
BUG_ON(!kvm->arch.sca);
if (!kvm_is_ucontrol(kvm)) {
if (!kvm->arch.sca) {
WARN_ON_ONCE(1);
goto out_free_cpu;
}
if (!kvm->arch.sca->cpu[id].sda)
kvm->arch.sca->cpu[id].sda = (__u64) vcpu->arch.sie_block;
vcpu->arch.sie_block->scaoh = (__u32)(((__u64)kvm->arch.sca) >> 32);
kvm->arch.sca->cpu[id].sda =
(__u64) vcpu->arch.sie_block;
vcpu->arch.sie_block->scaoh =
(__u32)(((__u64)kvm->arch.sca) >> 32);
vcpu->arch.sie_block->scaol = (__u32)(__u64)kvm->arch.sca;
set_bit(63 - id, (unsigned long *) &kvm->arch.sca->mcn);
}
spin_lock_init(&vcpu->arch.local_int.lock);
INIT_LIST_HEAD(&vcpu->arch.local_int.list);