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KVM: s390: Unlink vcpu on destroy - v2 

This patch makes sure we do unlink a vcpu's sie control block
from the system control area in kvm_arch_vcpu_destroy. This
prevents illegal accesses to the sie control block from other
virtual cpus after free.

Reported-by: Mijo Safradin <mijo@linux.vnet.ibm.com>
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Christian Ehrhardt <ehrhardt@de.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Carsten Otte 2009-05-12 17:21:51 +02:00 committed by Avi Kivity
parent b037a4f34e
commit abf4a71ed9
1 changed files with 8 additions and 2 deletions
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10
arch/s390/kvm/kvm-s390.c
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@ -196,6 +196,10 @@ out_nokvm:
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
VCPU_EVENT(vcpu, 3, "%s", "free cpu");
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();
free_page((unsigned long)(vcpu->arch.sie_block));
kvm_vcpu_uninit(vcpu);
kfree(vcpu);
@ -310,8 +314,10 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
vcpu->arch.sie_block->icpua = id;
BUG_ON(!kvm->arch.sca);
BUG_ON(kvm->arch.sca->cpu[id].sda);
kvm->arch.sca->cpu[id].sda = (__u64) vcpu->arch.sie_block;
if (!kvm->arch.sca->cpu[id].sda)
kvm->arch.sca->cpu[id].sda = (__u64) vcpu->arch.sie_block;
else
BUG_ON(!kvm->vcpus[id]); /* vcpu does already exist */
vcpu->arch.sie_block->scaoh = (__u32)(((__u64)kvm->arch.sca) >> 32);
vcpu->arch.sie_block->scaol = (__u32)(__u64)kvm->arch.sca;