qemu/HostIOMMUDevice-Store-the-VFIO-VDPA-agent.patch

From 35f33bf18826286c9e9fc739a893b9915c71f43c Mon Sep 17 00:00:00 2001
From: Eric Auger <eric.auger@redhat.com>
Date: Fri, 14 Jun 2024 11:52:51 +0200
Subject: [PATCH] HostIOMMUDevice: Store the VFIO/VDPA agent

Store the agent device (VFIO or VDPA) in the host IOMMU device.
This will allow easy access to some of its resources.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/vfio/container.c                | 1 +
 hw/vfio/iommufd.c                  | 2 ++
 include/sysemu/host_iommu_device.h | 1 +
 3 files changed, 4 insertions(+)

diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index 10f7635425..8a5a112b6b 100644
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -1259,6 +1259,7 @@ static bool hiod_legacy_vfio_realize(HostIOMMUDevice *hiod, void *opaque,
 
     hiod->name = g_strdup(vdev->name);
     hiod->caps.aw_bits = vfio_device_get_aw_bits(vdev);
+    hiod->agent = opaque;
 
     return true;
 }
diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
index 3b75cba26c..7a069ca576 100644
--- a/hw/vfio/iommufd.c
+++ b/hw/vfio/iommufd.c
@@ -735,6 +735,8 @@ static bool hiod_iommufd_vfio_realize(HostIOMMUDevice *hiod, void *opaque,
     } data;
     uint64_t hw_caps;
 
+    hiod->agent = opaque;
+
     if (!iommufd_backend_get_device_info(vdev->iommufd, vdev->devid,
                                          &type, &data, sizeof(data),
                                          &hw_caps, errp)) {
diff --git a/include/sysemu/host_iommu_device.h b/include/sysemu/host_iommu_device.h
index a57873958b..3e5f058e7b 100644
--- a/include/sysemu/host_iommu_device.h
+++ b/include/sysemu/host_iommu_device.h
@@ -34,6 +34,7 @@ struct HostIOMMUDevice {
     Object parent_obj;
 
     char *name;
+    void *agent; /* pointer to agent device, ie. VFIO or VDPA device */
     HostIOMMUDeviceCaps caps;
 };
 
-- 
2.41.0.windows.1