[PATCH for-4.5 v6 09/16] tools: Add limited support of VMware's hyper-call rpc

[Don Slutz <dslutz@verizon.com>]

  This guestinfo support is provided via libxc.  libxl support has
not be written.

Note: VMware RPC support is only available on HVM domU.

This interface is an extension of __HYPERVISOR_HVM_op.  It was
picked because xc_get_hvm_param() also uses it and VMware guest
info is a lot like a hvm param.

The HVMOP_get_vmport_guest_info is used by two libxc functions,
xc_get_vmport_guest_info and xc_fetch_all_vmport_guest_info.
xc_fetch_all_vmport_guest_info is designed to be used to fetch all
currently set guestinfo values.

Signed-off-by: Don Slutz <dslutz@verizon.com>
---
 tools/libxc/xc_domain.c | 115 ++++++++++++++++++++++++++++++++++++++++++++++++
 tools/libxc/xenctrl.h   |  24 ++++++++++
 2 files changed, 139 insertions(+)

diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
index 1a6f90a..ce24dad 100644
--- a/tools/libxc/xc_domain.c
+++ b/tools/libxc/xc_domain.c
@@ -1577,6 +1577,121 @@ int xc_hvm_set_ioreq_server_state(xc_interface *xch,
     return rc;
 }
 
+int xc_set_vmport_guest_info(xc_interface *handle,
+                             domid_t dom,
+                             unsigned int key_len,
+                             char *key,
+                             unsigned int val_len,
+                             char *val)
+{
+    DECLARE_HYPERCALL;
+    DECLARE_HYPERCALL_BUFFER(xen_hvm_vmport_guest_info_t, arg);
+    int rc;
+
+    if ( (key_len < 1) ||
+        (key_len > VMPORT_GUEST_INFO_KEY_MAX) ||
+        (val_len > VMPORT_GUEST_INFO_VAL_MAX) )
+        return -1;
+
+    arg = xc_hypercall_buffer_alloc(handle, arg, sizeof(*arg));
+    if ( arg == NULL )
+        return -1;
+
+    hypercall.op     = __HYPERVISOR_hvm_op;
+    hypercall.arg[0] = HVMOP_set_vmport_guest_info;
+    hypercall.arg[1] = HYPERCALL_BUFFER_AS_ARG(arg);
+    arg->domid = dom;
+    arg->key_length = key_len;
+    arg->value_length = val_len;
+    memcpy(arg->data, key, key_len);
+    memcpy(&arg->data[key_len], val, val_len);
+    rc = do_xen_hypercall(handle, &hypercall);
+    xc_hypercall_buffer_free(handle, arg);
+    return rc;
+}
+
+int xc_get_vmport_guest_info(xc_interface *handle,
+                             domid_t dom,
+                             unsigned int key_len,
+                             char *key,
+                             unsigned int val_max,
+                             unsigned int *val_len,
+                             char *val)
+{
+    DECLARE_HYPERCALL;
+    DECLARE_HYPERCALL_BUFFER(xen_hvm_vmport_guest_info_t, arg);
+    int rc;
+
+    if ( (key_len < 1) ||
+        (key_len > VMPORT_GUEST_INFO_KEY_MAX) )
+        return -1;
+
+    arg = xc_hypercall_buffer_alloc(handle, arg, sizeof(*arg));
+
+    hypercall.op     = __HYPERVISOR_hvm_op;
+    hypercall.arg[0] = HVMOP_get_vmport_guest_info;
+    hypercall.arg[1] = HYPERCALL_BUFFER_AS_ARG(arg);
+    arg->domid = dom;
+    arg->key_length = key_len;
+    arg->value_length = 0;
+    *val_len = 0;
+    memcpy(arg->data, key, key_len);
+    rc = do_xen_hypercall(handle, &hypercall);
+    if ( rc == 0 )
+    {
+        *val_len = arg->value_length;
+        if ( arg->value_length > val_max )
+            arg->value_length = val_max;
+        memcpy(val, &arg->data[key_len], arg->value_length);
+    }
+    xc_hypercall_buffer_free(handle, arg);
+    return rc;
+}
+
+int xc_fetch_all_vmport_guest_info(xc_interface *handle,
+                                   domid_t dom,
+                                   unsigned int idx,
+                                   unsigned int key_max,
+                                   unsigned int *key_len,
+                                   char *key,
+                                   unsigned int val_max,
+                                   unsigned int *val_len,
+                                   char *val)
+{
+    DECLARE_HYPERCALL;
+    DECLARE_HYPERCALL_BUFFER(xen_hvm_vmport_guest_info_t, arg);
+    int rc;
+
+    arg = xc_hypercall_buffer_alloc(handle, arg, sizeof(*arg));
+
+    hypercall.op     = __HYPERVISOR_hvm_op;
+    hypercall.arg[0] = HVMOP_get_vmport_guest_info;
+    hypercall.arg[1] = HYPERCALL_BUFFER_AS_ARG(arg);
+    arg->domid = dom;
+    arg->key_length = 0;
+    arg->value_length = idx;
+    *key_len = 0;
+    *val_len = 0;
+    rc = do_xen_hypercall(handle, &hypercall);
+    if ( rc == 0 )
+    {
+        uint16_t val_off = arg->key_length;
+
+        *key_len = arg->key_length;
+        if ( arg->key_length > key_max )
+            arg->key_length = key_max;
+        memcpy(key, arg->data, arg->key_length);
+        *val_len = arg->value_length;
+        if ( arg->value_length > val_max )
+            arg->value_length = val_max;
+        memcpy(val,
+               &arg->data[val_off],
+               arg->value_length);
+    }
+    xc_hypercall_buffer_free(handle, arg);
+    return rc;
+}
+
 int xc_domain_setdebugging(xc_interface *xch,
                            uint32_t domid,
                            unsigned int enable)
diff --git a/tools/libxc/xenctrl.h b/tools/libxc/xenctrl.h
index 514b241..baac464 100644
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -2019,6 +2019,30 @@ int xc_hvm_destroy_ioreq_server(xc_interface *xch,
                                 domid_t domid,
                                 ioservid_t id);
 
+int xc_set_vmport_guest_info(xc_interface *handle,
+                             domid_t dom,
+                             unsigned int key_len,
+                             char *key,
+                             unsigned int val_len,
+                             char *val);
+int xc_get_vmport_guest_info(xc_interface *handle,
+                             domid_t dom,
+                             unsigned int key_len,
+                             char *key,
+                             unsigned int val_max,
+                             unsigned int *val_len,
+                             char *val);
+int xc_fetch_all_vmport_guest_info(xc_interface *handle,
+                                   domid_t dom,
+                                   unsigned int idx,
+                                   unsigned int key_max,
+                                   unsigned int *key_len,
+                                   char *key,
+                                   unsigned int val_max,
+                                   unsigned int *val_len,
+                                   char *val);
+
+
 /* HVM guest pass-through */
 int xc_assign_device(xc_interface *xch,
                      uint32_t domid,
-- 
1.8.4