linux-kernel - [PATCH] iommu: adding missing kvm_iommu_map_pages/kvm_iommu_unmap

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Message-Id: <1360559342-21423-1-git-send-email-aik@ozlabs.ru>
Date:	Mon, 11 Feb 2013 16:09:02 +1100
From:	Alexey Kardashevskiy <aik@...abs.ru>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Alexey Kardashevskiy <aik@...abs.ru>,
	Paul Mackerras <paulus@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	David Gibson <david@...son.dropbear.id.au>,
	kvm-ppc@...r.kernel.org
Subject: [PATCH] iommu: adding missing kvm_iommu_map_pages/kvm_iommu_unmap_pages

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 POWERPC 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 does the patch.

Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
Cc: David Gibson <david@...son.dropbear.id.au>
---
 arch/powerpc/kernel/iommu.c |   17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index 31c4fdc..7c309fe 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -36,6 +36,7 @@
 #include <linux/hash.h>
 #include <linux/fault-inject.h>
 #include <linux/pci.h>
+#include <linux/kvm_host.h>
 #include <asm/io.h>
 #include <asm/prom.h>
 #include <asm/iommu.h>
@@ -860,3 +861,19 @@ void iommu_free_coherent(struct iommu_table *tbl, size_t size,
 		free_pages((unsigned long)vaddr, get_order(size));
 	}
 }
+
+#ifdef CONFIG_IOMMU_API
+/*
+ * SPAPR TCE API
+ */
+
+/* POWERPC does not use IOMMU API for mapping/unmapping */
+int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
+{
+	return 0;
+}
+void kvm_iommu_unmap_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
+{
+}
+
+#endif /* CONFIG_IOMMU_API */
-- 
1.7.10.4

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