KVM: s390: forward most SIGP orders to user space
Most SIGP orders are handled partially in kernel and partially in user space. In order to: - Get a correct SIGP SET PREFIX handler that informs user space - Avoid race conditions between concurrently executed SIGP orders - Serialize SIGP orders per VCPU We need to handle all "slow" SIGP orders in user space. The remaining ones to be handled completely in kernel are: - SENSE - SENSE RUNNING - EXTERNAL CALL - EMERGENCY SIGNAL - CONDITIONAL EMERGENCY SIGNAL According to the PoP, they have to be fast. They can be executed without conflicting to the actions of other pending/concurrently executing orders (e.g. STOP vs. START). This patch introduces a new capability that will - when enabled - forward all but the mentioned SIGP orders to user space. The instruction counters in the kernel are still updated. Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
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Christian Borntraeger

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@@ -759,6 +759,7 @@ struct kvm_ppc_smmu_info {
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#define KVM_CAP_PPC_FIXUP_HCALL 103
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#define KVM_CAP_PPC_ENABLE_HCALL 104
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#define KVM_CAP_CHECK_EXTENSION_VM 105
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#define KVM_CAP_S390_USER_SIGP 106
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#ifdef KVM_CAP_IRQ_ROUTING
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