qemu-kvm/kvm-vfio-spapr-Introduce-a-sPAPR-VFIOIOMMU-QOM-interface.patch

From 645ed97633935712edcc2c56f252738b38f15e3a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= <clg@redhat.com>
Date: Tue, 19 Dec 2023 07:58:22 +0100
Subject: [PATCH 055/101] vfio/spapr: Introduce a sPAPR VFIOIOMMU QOM interface
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RH-Author: Eric Auger <eric.auger@redhat.com>
RH-MergeRequest: 211: IOMMUFD backend backport
RH-Jira: RHEL-19302 RHEL-21057
RH-Acked-by: Cédric Le Goater <clg@redhat.com>
RH-Acked-by: Sebastian Ott <sebott@redhat.com>
RH-Commit: [54/67] 2ceac3c07d71790dc3852fbbbd4084a7affb9373 (eauger1/centos-qemu-kvm)

Move vfio_spapr_container_setup() to a VFIOIOMMUClass::setup handler
and convert the sPAPR VFIOIOMMUOps struct to a QOM interface. The
sPAPR QOM interface inherits from the legacy QOM interface because
because both have the same basic needs. The sPAPR interface is then
extended with the handlers specific to the sPAPR IOMMU.

This allows reuse and provides better abstraction of the backends. It
will be useful to avoid compiling the sPAPR IOMMU backend on targets
not supporting it.

Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Tested-by: Eric Farman <farman@linux.ibm.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
(cherry picked from commit f221f641a2fe69c2ca3857759551470664b0bec8)
Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
 hw/vfio/container.c                   | 18 +++++--------
 hw/vfio/spapr.c                       | 39 ++++++++++++++++-----------
 include/hw/vfio/vfio-container-base.h |  1 +
 3 files changed, 31 insertions(+), 27 deletions(-)

diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index c22bdd3216..688cf23bab 100644
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -381,6 +381,10 @@ static const VFIOIOMMUClass *vfio_get_iommu_class(int iommu_type, Error **errp)
     case VFIO_TYPE1_IOMMU:
         klass = object_class_by_name(TYPE_VFIO_IOMMU_LEGACY);
         break;
+    case VFIO_SPAPR_TCE_v2_IOMMU:
+    case VFIO_SPAPR_TCE_IOMMU:
+        klass = object_class_by_name(TYPE_VFIO_IOMMU_SPAPR);
+        break;
     default:
         g_assert_not_reached();
     };
@@ -623,19 +627,9 @@ static int vfio_connect_container(VFIOGroup *group, AddressSpace *as,
         goto free_container_exit;
     }
 
-    switch (container->iommu_type) {
-    case VFIO_TYPE1v2_IOMMU:
-    case VFIO_TYPE1_IOMMU:
-        ret = vfio_legacy_setup(bcontainer, errp);
-        break;
-    case VFIO_SPAPR_TCE_v2_IOMMU:
-    case VFIO_SPAPR_TCE_IOMMU:
-        ret = vfio_spapr_container_init(container, errp);
-        break;
-    default:
-        g_assert_not_reached();
-    }
+    assert(bcontainer->ops->setup);
 
+    ret = bcontainer->ops->setup(bcontainer, errp);
     if (ret) {
         goto enable_discards_exit;
     }
diff --git a/hw/vfio/spapr.c b/hw/vfio/spapr.c
index 44617dfc6b..0d949bb728 100644
--- a/hw/vfio/spapr.c
+++ b/hw/vfio/spapr.c
@@ -458,20 +458,11 @@ static void vfio_spapr_container_release(VFIOContainerBase *bcontainer)
     }
 }
 
-static VFIOIOMMUOps vfio_iommu_spapr_ops;
-
-static void setup_spapr_ops(VFIOContainerBase *bcontainer)
-{
-    vfio_iommu_spapr_ops = *bcontainer->ops;
-    vfio_iommu_spapr_ops.add_window = vfio_spapr_container_add_section_window;
-    vfio_iommu_spapr_ops.del_window = vfio_spapr_container_del_section_window;
-    vfio_iommu_spapr_ops.release = vfio_spapr_container_release;
-    bcontainer->ops = &vfio_iommu_spapr_ops;
-}
-
-int vfio_spapr_container_init(VFIOContainer *container, Error **errp)
+static int vfio_spapr_container_setup(VFIOContainerBase *bcontainer,
+                                      Error **errp)
 {
-    VFIOContainerBase *bcontainer = &container->bcontainer;
+    VFIOContainer *container = container_of(bcontainer, VFIOContainer,
+                                            bcontainer);
     VFIOSpaprContainer *scontainer = container_of(container, VFIOSpaprContainer,
                                                   container);
     struct vfio_iommu_spapr_tce_info info;
@@ -536,8 +527,6 @@ int vfio_spapr_container_init(VFIOContainer *container, Error **errp)
                           0x1000);
     }
 
-    setup_spapr_ops(bcontainer);
-
     return 0;
 
 listener_unregister_exit:
@@ -546,3 +535,23 @@ listener_unregister_exit:
     }
     return ret;
 }
+
+static void vfio_iommu_spapr_class_init(ObjectClass *klass, void *data)
+{
+    VFIOIOMMUClass *vioc = VFIO_IOMMU_CLASS(klass);
+
+    vioc->add_window = vfio_spapr_container_add_section_window;
+    vioc->del_window = vfio_spapr_container_del_section_window;
+    vioc->release = vfio_spapr_container_release;
+    vioc->setup = vfio_spapr_container_setup;
+};
+
+static const TypeInfo types[] = {
+    {
+        .name = TYPE_VFIO_IOMMU_SPAPR,
+        .parent = TYPE_VFIO_IOMMU_LEGACY,
+        .class_init = vfio_iommu_spapr_class_init,
+    },
+};
+
+DEFINE_TYPES(types)
diff --git a/include/hw/vfio/vfio-container-base.h b/include/hw/vfio/vfio-container-base.h
index ce8b1fba88..9e21d7811f 100644
--- a/include/hw/vfio/vfio-container-base.h
+++ b/include/hw/vfio/vfio-container-base.h
@@ -95,6 +95,7 @@ void vfio_container_destroy(VFIOContainerBase *bcontainer);
 
 #define TYPE_VFIO_IOMMU "vfio-iommu"
 #define TYPE_VFIO_IOMMU_LEGACY TYPE_VFIO_IOMMU "-legacy"
+#define TYPE_VFIO_IOMMU_SPAPR TYPE_VFIO_IOMMU "-spapr"
 
 /*
  * VFIOContainerBase is not an abstract QOM object because it felt
-- 
2.39.3