linux-kernel - [RFC 3/3] vfio/type1: Increase the version of VFIO_IOMMU_TYPE1_INFO_CAP_IOVA

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Date:   Mon, 28 Sep 2020 21:50:37 +0200
From:   Eric Auger <eric.auger@...hat.com>
To:     eric.auger.pro@...il.com, eric.auger@...hat.com, joro@...tes.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        will.deacon@....com, robin.murphy@....com, dwmw2@...radead.org,
        alex.williamson@...hat.com
Cc:     baolu.lu@...ux.intel.com, shameerali.kolothum.thodi@...wei.com,
        jean-philippe.brucker@....com
Subject: [RFC 3/3] vfio/type1: Increase the version of VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE

Now the IOVA regions beyond the dma_mask and the vfio aperture are
removed from the usable IOVA ranges, the API becomes reliable to
compute the max IOVA. Let's advertise this by using a new version
for the capability.

Signed-off-by: Eric Auger <eric.auger@...hat.com>
---
 drivers/vfio/vfio_iommu_type1.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 5fbf0c1f7433..af4596123954 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -2541,7 +2541,7 @@ static int vfio_iommu_iova_add_cap(struct vfio_info_cap *caps,
 	struct vfio_iommu_type1_info_cap_iova_range *iova_cap;
 
 	header = vfio_info_cap_add(caps, size,
-				   VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE, 1);
+				   VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE, 2);
 	if (IS_ERR(header))
 		return PTR_ERR(header);
 
-- 
2.21.3