linux-kernel - [PATCH 2/4] vfio: vfio_iommu_type1: Define VFIO_IOMMU_INFO

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Date:   Fri, 10 May 2019 10:22:33 +0200
From:   Pierre Morel <pmorel@...ux.ibm.com>
To:     sebott@...ux.vnet.ibm.com
Cc:     gerald.schaefer@...ibm.com, pasic@...ux.vnet.ibm.com,
        borntraeger@...ibm.com, walling@...ux.ibm.com,
        linux-s390@...r.kernel.org, iommu@...ts.linux-foundation.org,
        joro@...tes.org, linux-kernel@...r.kernel.org,
        alex.williamson@...hat.com, kvm@...r.kernel.org,
        schwidefsky@...ibm.com, heiko.carstens@...ibm.com
Subject: [PATCH 2/4] vfio: vfio_iommu_type1: Define VFIO_IOMMU_INFO_CAPABILITIES

To use the VFIO_IOMMU_GET_INFO to retrieve IOMMU specific information,
we define a new flag VFIO_IOMMU_INFO_CAPABILITIES in the
vfio_iommu_type1_info structure and the associated capability
information block.

Signed-off-by: Pierre Morel <pmorel@...ux.ibm.com>
---
 include/uapi/linux/vfio.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 8f10748..8f68e0f 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -715,6 +715,16 @@ 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_QFN		1
+#define VFIO_IOMMU_INFO_CAP_QGRP	2
+
+struct vfio_iommu_type1_info_block {
+	struct vfio_info_cap_header header;
+	__u32 data[];
 };
 
 #define VFIO_IOMMU_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12)
-- 
2.7.4