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| author | David Hildenbrand | 2014-04-14 12:40:03 +0200 |
|---|---|---|
| committer | Christian Borntraeger | 2014-07-10 14:09:44 +0200 |
| commit | 32f5ff63ff9c87195d06896e6ab4086b6369546a (patch) | |
| tree | f58d782380f402e03dcac5bbbe92776437a0052a /arch/s390/kvm/kvm-s390.c | |
| parent | KVM: s390: allow only one SIGP STOP (AND STORE STATUS) at a time (diff) | |
| download | kernel-qcow2-linux-32f5ff63ff9c87195d06896e6ab4086b6369546a.tar.gz kernel-qcow2-linux-32f5ff63ff9c87195d06896e6ab4086b6369546a.tar.xz kernel-qcow2-linux-32f5ff63ff9c87195d06896e6ab4086b6369546a.zip | |
KVM: s390: move finalization of SIGP STOP orders to kvm_s390_vcpu_stop
Let's move the finalization of SIGP STOP and SIGP STOP AND STORE STATUS orders to
the point where the VCPU is actually stopped.
This change is needed to prepare for a user space driven VCPU state change. The
action_bits may only be cleared when setting the cpu state to STOPPED while
holding the local irq lock.
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/kvm/kvm-s390.c')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 2f3e14fe91a4..c5077899de5b 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -1494,7 +1494,15 @@ void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu) spin_lock_bh(&vcpu->kvm->arch.start_stop_lock); online_vcpus = atomic_read(&vcpu->kvm->online_vcpus); + /* Need to lock access to action_bits to avoid a SIGP race condition */ + spin_lock_bh(&vcpu->arch.local_int.lock); atomic_set_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags); + + /* SIGP STOP and SIGP STOP AND STORE STATUS has been fully processed */ + vcpu->arch.local_int.action_bits &= + ~(ACTION_STOP_ON_STOP | ACTION_STORE_ON_STOP); + spin_unlock_bh(&vcpu->arch.local_int.lock); + __disable_ibs_on_vcpu(vcpu); for (i = 0; i < online_vcpus; i++) { |