linux-kernel - [PATCH kernel v9 30/32] vfio: powerpc/spapr: Use 32bit DMA window properties from table

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Message-Id: <1429964096-11524-31-git-send-email-aik@ozlabs.ru>
Date:	Sat, 25 Apr 2015 22:14:54 +1000
From:	Alexey Kardashevskiy <aik@...abs.ru>
To:	linuxppc-dev@...ts.ozlabs.org
Cc:	Alexey Kardashevskiy <aik@...abs.ru>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Alex Williamson <alex.williamson@...hat.com>,
	Gavin Shan <gwshan@...ux.vnet.ibm.com>,
	David Gibson <david@...son.dropbear.id.au>,
	linux-kernel@...r.kernel.org
Subject: [PATCH kernel v9 30/32] vfio: powerpc/spapr: Use 32bit DMA window properties from table_group

A table group might not have a table but it always has the default 32bit
window parameters so use these.

No change in behavior is expected.

Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
---
Changes:
v9:
* new in the series - to make the next patch simpler
---
 drivers/vfio/vfio_iommu_spapr_tce.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c
index 4cfc2c1..a7d6729 100644
--- a/drivers/vfio/vfio_iommu_spapr_tce.c
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
@@ -185,7 +185,6 @@ static int tce_iommu_enable(struct tce_container *container)
 {
 	int ret = 0;
 	unsigned long locked;
-	struct iommu_table *tbl;
 	struct iommu_table_group *table_group;
 
 	if (!container->grp)
@@ -221,13 +220,19 @@ static int tce_iommu_enable(struct tce_container *container)
 	 * this is that we cannot tell here the amount of RAM used by the guest
 	 * as this information is only available from KVM and VFIO is
 	 * KVM agnostic.
+	 *
+	 * So we do not allow enabling a container without a group attached
+	 * as there is no way to know how much we should increment
+	 * the locked_vm counter.
 	 */
 	table_group = iommu_group_get_iommudata(container->grp);
 	if (!table_group)
 		return -ENODEV;
 
-	tbl = &table_group->tables[0];
-	locked = (tbl->it_size << tbl->it_page_shift) >> PAGE_SHIFT;
+	if (!table_group->tce32_size)
+		return -EPERM;
+
+	locked = table_group->tce32_size >> PAGE_SHIFT;
 	ret = try_increment_locked_vm(locked);
 	if (ret)
 		return ret;
@@ -504,7 +509,6 @@ static long tce_iommu_ioctl(void *iommu_data,
 
 	case VFIO_IOMMU_SPAPR_TCE_GET_INFO: {
 		struct vfio_iommu_spapr_tce_info info;
-		struct iommu_table *tbl;
 		struct iommu_table_group *table_group;
 
 		if (WARN_ON(!container->grp))
@@ -512,8 +516,7 @@ static long tce_iommu_ioctl(void *iommu_data,
 
 		table_group = iommu_group_get_iommudata(container->grp);
 
-		tbl = &table_group->tables[0];
-		if (WARN_ON_ONCE(!tbl))
+		if (!table_group)
 			return -ENXIO;
 
 		minsz = offsetofend(struct vfio_iommu_spapr_tce_info,
@@ -525,8 +528,8 @@ static long tce_iommu_ioctl(void *iommu_data,
 		if (info.argsz < minsz)
 			return -EINVAL;
 
-		info.dma32_window_start = tbl->it_offset << tbl->it_page_shift;
-		info.dma32_window_size = tbl->it_size << tbl->it_page_shift;
+		info.dma32_window_start = table_group->tce32_start;
+		info.dma32_window_size = table_group->tce32_size;
 		info.flags = 0;
 
 		if (copy_to_user((void __user *)arg, &info, minsz))
-- 
2.0.0

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