linux-kernel - [PATCH 1/1] vfio iommu type1: set size to PAGE

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Date:   Tue, 6 Dec 2016 02:38:01 +0530
From:   Kirti Wankhede <kwankhede@...dia.com>
To:     <alex.williamson@...hat.com>, <pbonzini@...hat.com>,
        <kraxel@...hat.com>, <cjia@...dia.com>
CC:     <qemu-devel@...gnu.org>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Kirti Wankhede <kwankhede@...dia.com>
Subject: [PATCH 1/1] vfio iommu type1: set size to PAGE_SIZE while looking for iova in dma list

In the functions of pin_pages/unpin_pages from mdev vendor driver,
vfio_find_dma() should be called with size as PAGE_SIZE instead of 0.
vfio_find_dma() searches for the range in dma_list.

In vfio_dma_do_unmap(), vfio_find_dma() when used to look for start
address of unmap->iova, size should be 1, not 0. Otherwise vfio_find_dma()
returns NULL.

Signed-off-by: Kirti Wankhede <kwankhede@...dia.com>
Signed-off-by: Neo Jia <cjia@...dia.com>
Change-Id: Iee6fd45441c342b5e8626087046b2e0075d19a08
---
 drivers/vfio/vfio_iommu_type1.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index a28fbddb505c..023fba7b8d5a 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -581,7 +581,7 @@ static int vfio_iommu_type1_pin_pages(void *iommu_data,
 		struct vfio_pfn *vpfn;
 
 		iova = user_pfn[i] << PAGE_SHIFT;
-		dma = vfio_find_dma(iommu, iova, 0);
+		dma = vfio_find_dma(iommu, iova, PAGE_SIZE);
 		if (!dma) {
 			ret = -EINVAL;
 			goto pin_unwind;
@@ -622,7 +622,7 @@ pin_unwind:
 		dma_addr_t iova;
 
 		iova = user_pfn[j] << PAGE_SHIFT;
-		dma = vfio_find_dma(iommu, iova, 0);
+		dma = vfio_find_dma(iommu, iova, PAGE_SIZE);
 		vfio_unpin_page_external(dma, iova, do_accounting);
 		phys_pfn[j] = 0;
 	}
@@ -659,7 +659,7 @@ static int vfio_iommu_type1_unpin_pages(void *iommu_data,
 		dma_addr_t iova;
 
 		iova = user_pfn[i] << PAGE_SHIFT;
-		dma = vfio_find_dma(iommu, iova, 0);
+		dma = vfio_find_dma(iommu, iova, PAGE_SIZE);
 		if (!dma)
 			goto unpin_exit;
 		vfio_unpin_page_external(dma, iova, do_accounting);
@@ -826,7 +826,7 @@ again:
 	 * mappings within the range.
 	 */
 	if (iommu->v2) {
-		dma = vfio_find_dma(iommu, unmap->iova, 0);
+		dma = vfio_find_dma(iommu, unmap->iova, 1);
 		if (dma && dma->iova != unmap->iova) {
 			ret = -EINVAL;
 			goto unlock;
-- 
2.7.0