4.14-stable review patch. If anyone has any objections, please let me know.
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From: Christian Borntraeger borntraeger@de.ibm.com
[ Upstream commit 241e3ec0faf5ab1a0d9b1f6c43eefa919fb9c112 ]
commit a03825bbd0c3 ("KVM: s390: use kvm->created_vcpus") introduced kvm->created_vcpus to avoid races with the existing kvm->online_vcpus scheme. One place was "forgotten" and one new place was "added". Let's fix those.
Reported-by: Halil Pasic pasic@linux.vnet.ibm.com Signed-off-by: Christian Borntraeger borntraeger@de.ibm.com Reviewed-by: Halil Pasic pasic@linux.vnet.ibm.com Reviewed-by: Cornelia Huck cohuck@redhat.com Reviewed-by: David Hildenbrand david@redhat.com Fixes: 4e0b1ab72b8a ("KVM: s390: gs support for kvm guests") Fixes: a03825bbd0c3 ("KVM: s390: use kvm->created_vcpus") Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/s390/kvm/kvm-s390.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -601,7 +601,7 @@ static int kvm_vm_ioctl_enable_cap(struc case KVM_CAP_S390_GS: r = -EINVAL; mutex_lock(&kvm->lock); - if (atomic_read(&kvm->online_vcpus)) { + if (kvm->created_vcpus) { r = -EBUSY; } else if (test_facility(133)) { set_kvm_facility(kvm->arch.model.fac_mask, 133); @@ -1121,7 +1121,7 @@ static int kvm_s390_set_processor_feat(s return -EINVAL;
mutex_lock(&kvm->lock); - if (!atomic_read(&kvm->online_vcpus)) { + if (!kvm->created_vcpus) { bitmap_copy(kvm->arch.cpu_feat, (unsigned long *) data.feat, KVM_S390_VM_CPU_FEAT_NR_BITS); ret = 0;