[Xen-devel] [PATCH V3 3/29] DOMCTL: Introduce new DOMCTL commands for vIOMMU support

[Lan Tianyu <tianyu.lan@xxxxxxxxx>]

This patch is to introduce create, destroy and query capabilities
command for vIOMMU. vIOMMU layer will deal with requests and call
arch vIOMMU ops.

Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
 xen/common/domctl.c         |  6 ++++++
 xen/common/viommu.c         | 30 ++++++++++++++++++++++++++++++
 xen/include/public/domctl.h | 42 ++++++++++++++++++++++++++++++++++++++++++
 xen/include/xen/viommu.h    |  2 ++
 4 files changed, 80 insertions(+)

diff --git a/xen/common/domctl.c b/xen/common/domctl.c
index 42658e5..7e28237 100644
--- a/xen/common/domctl.c
+++ b/xen/common/domctl.c
@@ -1149,6 +1149,12 @@ long do_domctl(XEN_GUEST_HANDLE_PARAM(xen_domctl_t) 
u_domctl)
             copyback = 1;
         break;
 
+#ifdef CONFIG_VIOMMU
+    case XEN_DOMCTL_viommu_op:
+        ret = viommu_domctl(d, &op->u.viommu_op, &copyback);
+        break;
+#endif
+
     default:
         ret = arch_do_domctl(op, d, u_domctl);
         break;
diff --git a/xen/common/viommu.c b/xen/common/viommu.c
index 64d91e6..55feb5d 100644
--- a/xen/common/viommu.c
+++ b/xen/common/viommu.c
@@ -133,6 +133,36 @@ static int viommu_create(struct domain *d, uint64_t type,
     return 0;
 }
 
+int viommu_domctl(struct domain *d, struct xen_domctl_viommu_op *op,
+                  bool *need_copy)
+{
+    int rc = -EINVAL;
+
+    if ( !viommu_enabled() )
+        return -ENODEV;
+
+    switch ( op->cmd )
+    {
+    case XEN_DOMCTL_create_viommu:
+        rc = viommu_create(d, op->u.create.viommu_type,
+                           op->u.create.base_address,
+                           op->u.create.capabilities,
+                           &op->u.create.viommu_id);
+        if ( !rc )
+            *need_copy = true;
+        break;
+
+    case XEN_DOMCTL_destroy_viommu:
+        rc = viommu_destroy_domain(d);
+        break;
+
+    default:
+        return -ENOSYS;
+    }
+
+    return rc;
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
index 50ff58f..68854b6 100644
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -1163,6 +1163,46 @@ struct xen_domctl_psr_cat_op {
 typedef struct xen_domctl_psr_cat_op xen_domctl_psr_cat_op_t;
 DEFINE_XEN_GUEST_HANDLE(xen_domctl_psr_cat_op_t);
 
+/*  vIOMMU helper
+ *
+ *  vIOMMU interface can be used to create/destroy vIOMMU and
+ *  query vIOMMU capabilities.
+ */
+
+/* vIOMMU type - specify vendor vIOMMU device model */
+#define VIOMMU_TYPE_INTEL_VTD           0
+
+/* vIOMMU capabilities */
+#define VIOMMU_CAP_IRQ_REMAPPING  (1u << 0)
+
+struct xen_domctl_viommu_op {
+    uint32_t cmd;
+#define XEN_DOMCTL_create_viommu          0
+#define XEN_DOMCTL_destroy_viommu         1
+    union {
+        struct {
+            /* IN - vIOMMU type */
+            uint64_t viommu_type;
+            /* 
+             * IN - MMIO base address of vIOMMU. vIOMMU device models
+             * are in charge of to check base_address.
+             */
+            uint64_t base_address;
+            /* IN - Capabilities with which we want to create */
+            uint64_t capabilities;
+            /* OUT - vIOMMU identity */
+            uint32_t viommu_id;
+        } create;
+
+        struct {
+            /* IN - vIOMMU identity */
+            uint32_t viommu_id;
+        } destroy;
+    } u;
+};
+typedef struct xen_domctl_viommu_op xen_domctl_viommu_op;
+DEFINE_XEN_GUEST_HANDLE(xen_domctl_viommu_op);
+
 struct xen_domctl {
     uint32_t cmd;
 #define XEN_DOMCTL_createdomain                   1
@@ -1240,6 +1280,7 @@ struct xen_domctl {
 #define XEN_DOMCTL_monitor_op                    77
 #define XEN_DOMCTL_psr_cat_op                    78
 #define XEN_DOMCTL_soft_reset                    79
+#define XEN_DOMCTL_viommu_op                     80
 #define XEN_DOMCTL_gdbsx_guestmemio            1000
 #define XEN_DOMCTL_gdbsx_pausevcpu             1001
 #define XEN_DOMCTL_gdbsx_unpausevcpu           1002
@@ -1302,6 +1343,7 @@ struct xen_domctl {
         struct xen_domctl_psr_cmt_op        psr_cmt_op;
         struct xen_domctl_monitor_op        monitor_op;
         struct xen_domctl_psr_cat_op        psr_cat_op;
+        struct xen_domctl_viommu_op         viommu_op;
         uint8_t                             pad[128];
     } u;
 };
diff --git a/xen/include/xen/viommu.h b/xen/include/xen/viommu.h
index 636a2a3..baa8ab7 100644
--- a/xen/include/xen/viommu.h
+++ b/xen/include/xen/viommu.h
@@ -43,6 +43,8 @@ static inline bool viommu_enabled(void)
 
 int viommu_register_type(uint64_t type, struct viommu_ops *ops);
 int viommu_destroy_domain(struct domain *d);
+int viommu_domctl(struct domain *d, struct xen_domctl_viommu_op *op,
+                  bool_t *need_copy);
 #else
 static inline int viommu_register_type(uint64_t type, struct viommu_ops *ops)
 {
-- 
1.8.3.1


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