From 58f9460ba1cc9de67e6591bfd08dccded43d27bd Mon Sep 17 00:00:00 2001 From: Carsten Otte Date: Wed, 4 Jan 2012 10:25:27 +0100 Subject: [PATCH] KVM: s390: ucontrol: disable sca 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 Signed-off-by: Marcelo Tosatti Signed-off-by: Avi Kivity --- arch/s390/kvm/kvm-s390.c | 30 ++++++++++++++++++++---------- 1 file changed, 20 insertions(+), 10 deletions(-) diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 8489edf80c8..abf784d8c68 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -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 (vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda == - (__u64) vcpu->arch.sie_block) - vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda = 0; + 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->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); - vcpu->arch.sie_block->scaol = (__u32)(__u64)kvm->arch.sca; - set_bit(63 - id, (unsigned long *) &kvm->arch.sca->mcn); + 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); + 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); -- 2.41.0