Re: [PATCH 2/5] KVM: PPC: iommu: Add missing kvm_iommu_map_pages/kvm_iommu_unmap_pages

From: Alexey Kardashevskiy <redacted>

The IOMMU API implements groups creating/deletion, device binding
and IOMMU map/unmap operations.

The PowerPC implementation uses most of the API except map/unmap
operations, which are implemented on POWER using hypercalls.

However, in order to link a kernel with the CONFIG_IOMMU_API enabled,
the empty kvm_iommu_map_pages/kvm_iommu_unmap_pages have to be
defined, so this defines them.

Signed-off-by: Alexey Kardashevskiy <redacted>
Cc: David Gibson <redacted>
Signed-off-by: Paul Mackerras <redacted>
---
 arch/powerpc/include/asm/kvm_host.h |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index b6a047e..c025d91 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h

@@ -603,4 +603,18 @@ struct kvm_vcpu_arch {
 
 #define __KVM_HAVE_ARCH_WQP
 
+#ifdef CONFIG_IOMMU_API
+/* POWERPC does not use IOMMU API for mapping/unmapping */
+static inline int kvm_iommu_map_pages(struct kvm *kvm,
+		struct kvm_memory_slot *slot)
+{
+	return 0;
+}
+
+static inline void kvm_iommu_unmap_pages(struct kvm *kvm,
+		struct kvm_memory_slot *slot)
+{
+}
+#endif /* CONFIG_IOMMU_API */
+
 #endif /* __POWERPC_KVM_HOST_H__ */