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| author | David Hildenbrand <dahi@linux.vnet.ibm.com> | 2014-04-14 12:40:03 +0200 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2014-07-10 14:09:44 +0200 |
| commit | 32f5ff63ff9c87195d06896e6ab4086b6369546a (patch) | |
| tree | f58d782380f402e03dcac5bbbe92776437a0052a /arch/s390/kvm/intercept.c | |
| parent | KVM: s390: allow only one SIGP STOP (AND STORE STATUS) at a time (diff) | |
| download | linux-32f5ff63ff9c87195d06896e6ab4086b6369546a.tar.xz 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/intercept.c')
| -rw-r--r-- | arch/s390/kvm/intercept.c | 31 |
1 files changed, 12 insertions, 19 deletions
diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c index a0b586c1913c..ac6b32585a36 100644 --- a/arch/s390/kvm/intercept.c +++ b/arch/s390/kvm/intercept.c @@ -56,32 +56,25 @@ static int handle_noop(struct kvm_vcpu *vcpu) static int handle_stop(struct kvm_vcpu *vcpu) { int rc = 0; + unsigned int action_bits; vcpu->stat.exit_stop_request++; - spin_lock_bh(&vcpu->arch.local_int.lock); - trace_kvm_s390_stop_request(vcpu->arch.local_int.action_bits); - if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP) { - kvm_s390_vcpu_stop(vcpu); - vcpu->arch.local_int.action_bits &= ~ACTION_STOP_ON_STOP; - VCPU_EVENT(vcpu, 3, "%s", "cpu stopped"); - rc = -EOPNOTSUPP; - } + action_bits = vcpu->arch.local_int.action_bits; - if (vcpu->arch.local_int.action_bits & ACTION_STORE_ON_STOP) { - vcpu->arch.local_int.action_bits &= ~ACTION_STORE_ON_STOP; - /* store status must be called unlocked. Since local_int.lock - * only protects local_int.* and not guest memory we can give - * up the lock here */ - spin_unlock_bh(&vcpu->arch.local_int.lock); + if (!(action_bits & ACTION_STOP_ON_STOP)) + return 0; + + if (action_bits & ACTION_STORE_ON_STOP) { rc = kvm_s390_vcpu_store_status(vcpu, KVM_S390_STORE_STATUS_NOADDR); - if (rc >= 0) - rc = -EOPNOTSUPP; - } else - spin_unlock_bh(&vcpu->arch.local_int.lock); - return rc; + if (rc) + return rc; + } + + kvm_s390_vcpu_stop(vcpu); + return -EOPNOTSUPP; } static int handle_validity(struct kvm_vcpu *vcpu) |