linux-kernel - [PATCH v1 1/2] vfio:iommu: Use capabilities do report IOMMU informations

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Date:   Wed,  9 Jan 2019 13:41:53 +0100
From:   Pierre Morel <pmorel@...ux.ibm.com>
To:     alex.williamson@...hat.com
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        walling@...ux.ibm.com, cohuck@...hat.com, david@...hat.com,
        pasic@...ux.ibm.com, thuth@...hat.com
Subject: [PATCH v1 1/2] vfio:iommu: Use capabilities do report IOMMU informations

We add a new flag, VFIO_IOMMU_INFO_CAPABILITIES, inside the
vfio_iommu_type1_info to specify the support for capabilities.

We add a new capability, with id VFIO_IOMMU_INFO_CAP_DMA
in the capability list of the VFIO_IOMMU_GET_INFO ioctl.

Signed-off-by: Pierre Morel <pmorel@...ux.ibm.com>
---
 include/uapi/linux/vfio.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 8131028..54c4fcb 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -669,6 +669,15 @@ struct vfio_iommu_type1_info {
 	__u32	flags;
 #define VFIO_IOMMU_INFO_PGSIZES (1 << 0)	/* supported page sizes info */
 	__u64	iova_pgsizes;		/* Bitmap of supported page sizes */
+#define VFIO_IOMMU_INFO_CAPABILITIES (1 << 1)  /* support capabilities info */
+	__u64   cap_offset;     /* Offset within info struct of first cap */
+};
+
+#define VFIO_IOMMU_INFO_CAP_DMA 1
+struct vfio_iommu_cap_dma {
+	struct vfio_info_cap_header header;
+	__u64   dma_start;
+	__u64   dma_end;
 };
 
 #define VFIO_IOMMU_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12)
-- 
2.7.4