[PATCH v1 13/22] vfio: add bind stage-1 page table support

[Liu Yi L <yi.l.liu@intel.com>]

This patch adds bind_stage1_pgtbl() definition in HostIOMMUContextClass,
also adds corresponding implementation in VFIO. This is to expose a way
for vIOMMU to setup dual stage DMA translation for passthru devices on
hardware.

Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Eric Auger <eric.auger@redhat.com>
Cc: Yi Sun <yi.y.sun@linux.intel.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
---
 hw/iommu/host_iommu_context.c         | 49 ++++++++++++++++++++++++++++++-
 hw/vfio/common.c                      | 55 ++++++++++++++++++++++++++++++++++-
 include/hw/iommu/host_iommu_context.h | 26 ++++++++++++++++-
 3 files changed, 127 insertions(+), 3 deletions(-)

diff --git a/hw/iommu/host_iommu_context.c b/hw/iommu/host_iommu_context.c
index af61899..8a53376 100644
--- a/hw/iommu/host_iommu_context.c
+++ b/hw/iommu/host_iommu_context.c
@@ -69,21 +69,67 @@ int host_iommu_ctx_pasid_free(HostIOMMUContext *host_icx, uint32_t pasid)
     return hicxc->pasid_free(host_icx, pasid);
 }
 
+int host_iommu_ctx_bind_stage1_pgtbl(HostIOMMUContext *host_icx,
+                                     DualIOMMUStage1BindData *data)
+{
+    HostIOMMUContextClass *hicxc;
+
+    if (!host_icx) {
+        return -EINVAL;
+    }
+
+    hicxc = HOST_IOMMU_CONTEXT_GET_CLASS(host_icx);
+    if (!hicxc) {
+        return -EINVAL;
+    }
+
+    if (!(host_icx->flags & HOST_IOMMU_NESTING) ||
+        !hicxc->bind_stage1_pgtbl) {
+        return -EINVAL;
+    }
+
+    return hicxc->bind_stage1_pgtbl(host_icx, data);
+}
+
+int host_iommu_ctx_unbind_stage1_pgtbl(HostIOMMUContext *host_icx,
+                                       DualIOMMUStage1BindData *data)
+{
+    HostIOMMUContextClass *hicxc;
+
+    if (!host_icx) {
+        return -EINVAL;
+    }
+
+    hicxc = HOST_IOMMU_CONTEXT_GET_CLASS(host_icx);
+    if (!hicxc) {
+        return -EINVAL;
+    }
+
+    if (!(host_icx->flags & HOST_IOMMU_NESTING) ||
+        !hicxc->unbind_stage1_pgtbl) {
+        return -EINVAL;
+    }
+
+    return hicxc->unbind_stage1_pgtbl(host_icx, data);
+}
+
 void host_iommu_ctx_init(void *_host_icx, size_t instance_size,
                          const char *mrtypename,
-                         uint64_t flags)
+                         uint64_t flags, uint32_t formats)
 {
     HostIOMMUContext *host_icx;
 
     object_initialize(_host_icx, instance_size, mrtypename);
     host_icx = HOST_IOMMU_CONTEXT(_host_icx);
     host_icx->flags = flags;
+    host_icx->stage1_formats = formats;
     host_icx->initialized = true;
 }
 
 void host_iommu_ctx_destroy(HostIOMMUContext *host_icx)
 {
     host_icx->flags = 0x0;
+    host_icx->stage1_formats = 0x0;
     host_icx->initialized = false;
 }
 
@@ -92,6 +138,7 @@ static void host_icx_init_fn(Object *obj)
     HostIOMMUContext *host_icx = HOST_IOMMU_CONTEXT(obj);
 
     host_icx->flags = 0x0;
+    host_icx->stage1_formats = 0x0;
     host_icx->initialized = false;
 }
 
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index e0f2828..770a785 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -1223,6 +1223,52 @@ static int vfio_host_icx_pasid_free(HostIOMMUContext *host_icx,
     return 0;
 }
 
+static int vfio_host_icx_bind_stage1_pgtbl(HostIOMMUContext *host_icx,
+                                           DualIOMMUStage1BindData *bind_data)
+{
+    VFIOContainer *container = container_of(host_icx, VFIOContainer, host_icx);
+    struct vfio_iommu_type1_bind *bind;
+    unsigned long argsz;
+    int ret = 0;
+
+    argsz = sizeof(*bind) + sizeof(bind_data->bind_data);
+    bind = g_malloc0(argsz);
+    bind->argsz = argsz;
+    bind->flags = VFIO_IOMMU_BIND_GUEST_PGTBL;
+    memcpy(&bind->data, &bind_data->bind_data, sizeof(bind_data->bind_data));
+
+    if (ioctl(container->fd, VFIO_IOMMU_BIND, bind)) {
+        ret = -errno;
+        error_report("%s: pasid (%u) bind failed: %d",
+                      __func__, bind_data->pasid, ret);
+    }
+    g_free(bind);
+    return ret;
+}
+
+static int vfio_host_icx_unbind_stage1_pgtbl(HostIOMMUContext *host_icx,
+                                        DualIOMMUStage1BindData *bind_data)
+{
+    VFIOContainer *container = container_of(host_icx, VFIOContainer, host_icx);
+    struct vfio_iommu_type1_bind *bind;
+    unsigned long argsz;
+    int ret = 0;
+
+    argsz = sizeof(*bind) + sizeof(bind_data->bind_data);
+    bind = g_malloc0(argsz);
+    bind->argsz = argsz;
+    bind->flags = VFIO_IOMMU_UNBIND_GUEST_PGTBL;
+    memcpy(&bind->data, &bind_data->bind_data, sizeof(bind_data->bind_data));
+
+    if (ioctl(container->fd, VFIO_IOMMU_BIND, bind)) {
+        ret = -errno;
+        error_report("%s: pasid (%u) unbind failed: %d",
+                      __func__, bind_data->pasid, ret);
+    }
+    g_free(bind);
+    return ret;
+}
+
 /**
  * Get iommu info from host. Caller of this funcion should free
  * the memory pointed by the returned pointer stored in @info
@@ -1337,6 +1383,7 @@ static int vfio_init_container(VFIOContainer *container, int group_fd,
         struct vfio_iommu_type1_info_cap_nesting nesting = {
                                          .nesting_capabilities = 0x0,
                                          .stage1_formats = 0, };
+        uint32_t stage1_formats;
 
         ret = vfio_get_nesting_iommu_cap(container, &nesting);
         if (ret) {
@@ -1347,10 +1394,14 @@ static int vfio_init_container(VFIOContainer *container, int group_fd,
 
         flags |= (nesting.nesting_capabilities & VFIO_IOMMU_PASID_REQS) ?
                  HOST_IOMMU_PASID_REQUEST : 0;
+        flags |= HOST_IOMMU_NESTING;
+        stage1_formats = nesting.stage1_formats;
+
         host_iommu_ctx_init(&container->host_icx,
                             sizeof(container->host_icx),
                             TYPE_VFIO_HOST_IOMMU_CONTEXT,
-                            flags);
+                            flags,
+                            stage1_formats);
     }
 
     container->iommu_type = iommu_type;
@@ -1943,6 +1994,8 @@ static void vfio_host_iommu_context_class_init(ObjectClass *klass,
 
     hicxc->pasid_alloc = vfio_host_icx_pasid_alloc;
     hicxc->pasid_free = vfio_host_icx_pasid_free;
+    hicxc->bind_stage1_pgtbl = vfio_host_icx_bind_stage1_pgtbl;
+    hicxc->unbind_stage1_pgtbl = vfio_host_icx_unbind_stage1_pgtbl;
 }
 
 static const TypeInfo vfio_host_iommu_context_info = {
diff --git a/include/hw/iommu/host_iommu_context.h b/include/hw/iommu/host_iommu_context.h
index 5f11a4c..97c9473 100644
--- a/include/hw/iommu/host_iommu_context.h
+++ b/include/hw/iommu/host_iommu_context.h
@@ -41,6 +41,7 @@
                          TYPE_HOST_IOMMU_CONTEXT)
 
 typedef struct HostIOMMUContext HostIOMMUContext;
+typedef struct DualIOMMUStage1BindData DualIOMMUStage1BindData;
 
 typedef struct HostIOMMUContextClass {
     /* private */
@@ -54,6 +55,16 @@ typedef struct HostIOMMUContextClass {
     /* Reclaim pasid from HostIOMMUContext (a.k.a. host software) */
     int (*pasid_free)(HostIOMMUContext *host_icx,
                       uint32_t pasid);
+    /*
+     * Bind stage-1 page table to a hostIOMMU w/ dual stage
+     * DMA translation capability.
+     * @bind_data specifies the bind configurations.
+     */
+    int (*bind_stage1_pgtbl)(HostIOMMUContext *dsi_obj,
+                             DualIOMMUStage1BindData *bind_data);
+    /* Undo a previous bind. @bind_data specifies the unbind info. */
+    int (*unbind_stage1_pgtbl)(HostIOMMUContext *dsi_obj,
+                               DualIOMMUStage1BindData *bind_data);
 } HostIOMMUContextClass;
 
 /*
@@ -62,17 +73,30 @@ typedef struct HostIOMMUContextClass {
 struct HostIOMMUContext {
     Object parent_obj;
 #define HOST_IOMMU_PASID_REQUEST (1ULL << 0)
+#define HOST_IOMMU_NESTING       (1ULL << 1)
     uint64_t flags;
+    uint32_t stage1_formats;
     bool initialized;
 };
 
+struct DualIOMMUStage1BindData {
+    uint32_t pasid;
+    union {
+        struct iommu_gpasid_bind_data gpasid_bind;
+    } bind_data;
+};
+
 int host_iommu_ctx_pasid_alloc(HostIOMMUContext *host_icx, uint32_t min,
                                uint32_t max, uint32_t *pasid);
 int host_iommu_ctx_pasid_free(HostIOMMUContext *host_icx, uint32_t pasid);
+int host_iommu_ctx_bind_stage1_pgtbl(HostIOMMUContext *host_icx,
+                                     DualIOMMUStage1BindData *data);
+int host_iommu_ctx_unbind_stage1_pgtbl(HostIOMMUContext *host_icx,
+                                       DualIOMMUStage1BindData *data);
 
 void host_iommu_ctx_init(void *_host_icx, size_t instance_size,
                          const char *mrtypename,
-                         uint64_t flags);
+                         uint64_t flags, uint32_t formats);
 void host_iommu_ctx_destroy(HostIOMMUContext *host_icx);
 
 #endif
-- 
2.7.4