linux-kernel - [PATCH kernel] vfio: Only check for bus IOMMU when NOIOMMU is selected

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Date:	Fri, 22 Jan 2016 17:34:54 +1100
From:	Alexey Kardashevskiy <aik@...abs.ru>
To:	linuxppc-dev@...ts.ozlabs.org
Cc:	Alexey Kardashevskiy <aik@...abs.ru>,
	Alex Williamson <alex.williamson@...hat.com>,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH kernel] vfio: Only check for bus IOMMU when NOIOMMU is selected

Recent change 03a76b60 "vfio: Include No-IOMMU mode" disabled VFIO
on systems which do not implement iommu_ops for the PCI bus even though
there is an VFIO IOMMU driver for it such as SPAPR TCE driver for
PPC64/powernv platform.

This moves iommu_present() call under #ifdef CONFIG_VFIO_NOIOMMU as
it is done in the rest of the file to re-enable VFIO on powernv.

Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
---
 drivers/vfio/vfio.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 82f25cc..3f8060e 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -343,7 +343,6 @@ static struct vfio_group *vfio_create_group(struct iommu_group *iommu_group,
 	atomic_set(&group->opened, 0);
 	group->iommu_group = iommu_group;
 	group->noiommu = !iommu_present;
-
 	group->nb.notifier_call = vfio_iommu_group_notifier;
 
 	/*
@@ -767,7 +766,11 @@ int vfio_add_group_dev(struct device *dev,
 
 	group = vfio_group_get_from_iommu(iommu_group);
 	if (!group) {
+#ifdef CONFIG_VFIO_NOIOMMU
 		group = vfio_create_group(iommu_group, iommu_present(dev->bus));
+#else
+		group = vfio_create_group(iommu_group, true);
+#endif
 		if (IS_ERR(group)) {
 			iommu_group_put(iommu_group);
 			return PTR_ERR(group);
-- 
2.5.0.rc3