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KVM: s390: Reworked SIGP RESTART order 

When SIGP RESTART detected an illegal CPU address, there is no need to
drop to userspace, we can return CC3 to the guest directly instead.
Also renamed __sigp_restart() to sigp_check_callable() (since this
is a better description of what the function is really doing) and
moved a string specific to RESTART to the calling place instead, so
that this function gets usable by other SIGP orders, too.

Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Thomas Huth 2013-11-27 11:47:10 +01:00 committed by Cornelia Huck
parent b13d3580ee
commit cc92d6dea1
1 changed files with 11 additions and 8 deletions
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19
arch/s390/kvm/sigp.c
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@ -363,7 +363,8 @@ static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr,
return rc;
}
static int __sigp_restart(struct kvm_vcpu *vcpu, u16 cpu_addr)
/* Test whether the destination CPU is available and not busy */
static int sigp_check_callable(struct kvm_vcpu *vcpu, u16 cpu_addr)
{
struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
struct kvm_s390_local_interrupt *li;
@ -382,9 +383,6 @@ static int __sigp_restart(struct kvm_vcpu *vcpu, u16 cpu_addr)
spin_lock_bh(&li->lock);
if (li->action_bits & ACTION_STOP_ON_STOP)
rc = SIGP_CC_BUSY;
else
VCPU_EVENT(vcpu, 4, "sigp restart %x to handle userspace",
cpu_addr);
spin_unlock_bh(&li->lock);
out:
spin_unlock(&fi->lock);
@ -459,10 +457,15 @@ int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
break;
case SIGP_RESTART:
vcpu->stat.instruction_sigp_restart++;
rc = __sigp_restart(vcpu, cpu_addr);
if (rc == SIGP_CC_BUSY)
break;
/* user space must know about restart */
rc = sigp_check_callable(vcpu, cpu_addr);
if (rc == SIGP_CC_ORDER_CODE_ACCEPTED) {
VCPU_EVENT(vcpu, 4,
"sigp restart %x to handle userspace",
cpu_addr);
/* user space must know about restart */
rc = -EOPNOTSUPP;
}
break;
default:
return -EOPNOTSUPP;
}