[PATCH v5 0/8] In-kernel XICS interrupt controller emulation

[Paul Mackerras <paulus@samba.org>]

This is a repost of my patch series implementing in-kernel emulation
of the XICS interrupt controller architecture defined in PAPR (Power
Architecture Platform Requirements, the document that defines IBM's
pSeries platform architecture).  This version of the patch series uses
the latest device API as posted by Scott Wood, that is, i.e., the
version where the core device code provides the file descriptor and
ioctl handler.  I have structured the series so that the API is added
by the last two patches, so as to be able to accommodate any future
revisions to the device API with minimal changes.

The series is based on Alex Graf's kvm-ppc-queue branch with Scott
Wood's recent patch series applied on top, together with the patch
below to allow it to build with CONFIG_KVM_MPIC=n.

The API defined here uses KVM_CREATE_DEVICE to create the XICS,
KVM_DEVICE_SET_ATTR/KVM_DEVICE_GET_ATTR to manipulate the interrupt
sources (for initialization and migration), a new KVM_CAP_IRQ_XICS
capability to connect vcpus to the XICS, a new identifier
KVM_REG_PPC_ICP_STATE for the one-reg interface to get and set
per-vcpu state, and the existing KVM_IRQ_LINE ioctl to assert and
deassert interrupt sources.

This version also cleans up some checkpatch.pl errors and clarifies
the lifetime rules for the various objects.  There are two checkpatch
warnings for long lines, but they are long because they have long
strings in them, and if I break the strings over two lines then
checkpatch warns about that.

Paul.

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 1d3888b..bd41eea 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -466,9 +466,11 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 	kvmppc_remove_vcpu_debugfs(vcpu);
 
 	switch (vcpu->arch.irq_type) {
+#ifdef CONFIG_KVM_MPIC
 	case KVMPPC_IRQ_MPIC:
 		kvmppc_mpic_disconnect_vcpu(vcpu->arch.mpic, vcpu);
 		break;
+#endif
 	}
 
 	kvmppc_core_vcpu_free(vcpu);