[Xen-devel] [PATCH 14 of 25] libxc: convert tmem interface over to hypercall buffers

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

# HG changeset patch
# User Ian Campbell <ian.campbell@xxxxxxxxxx>
# Date 1287756891 -3600
# Node ID f9d7420fae6d3f4a324cd783ab56ea5a158cf664
# Parent  441891ba02392f7ac7ca215569eab45023b8c9cc
libxc: convert tmem interface over to hypercall buffers

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

diff -r 441891ba0239 -r f9d7420fae6d tools/libxc/xc_tmem.c
--- a/tools/libxc/xc_tmem.c     Fri Oct 22 15:14:51 2010 +0100
+++ b/tools/libxc/xc_tmem.c     Fri Oct 22 15:14:51 2010 +0100
@@ -25,21 +25,23 @@ static int do_tmem_op(xc_interface *xch,
 {
     int ret;
     DECLARE_HYPERCALL;
+    DECLARE_HYPERCALL_BOUNCE(op, sizeof(*op), XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
+
+    if ( xc_hypercall_bounce_pre(xch, op) )
+    {
+        PERROR("Could not bounce buffer for tmem op hypercall");
+        return -EFAULT;
+    }
 
     hypercall.op = __HYPERVISOR_tmem_op;
-    hypercall.arg[0] = (unsigned long)op;
-    if (lock_pages(xch, op, sizeof(*op)) != 0)
-    {
-        PERROR("Could not lock memory for Xen hypercall");
-        return -EFAULT;
-    }
+    hypercall.arg[0] = HYPERCALL_BUFFER_AS_ARG(op);
     if ((ret = do_xen_hypercall(xch, &hypercall)) < 0)
     {
         if ( errno == EACCES )
             DPRINTF("tmem operation failed -- need to"
                     " rebuild the user-space tool set?\n");
     }
-    unlock_pages(xch, op, sizeof(*op));
+    xc_hypercall_bounce_post(xch, op);
 
     return ret;
 }
@@ -54,13 +56,13 @@ int xc_tmem_control(xc_interface *xch,
                     void *buf)
 {
     tmem_op_t op;
+    DECLARE_HYPERCALL_BOUNCE(buf, arg1, XC_HYPERCALL_BUFFER_BOUNCE_OUT);
     int rc;
 
     op.cmd = TMEM_CONTROL;
     op.pool_id = pool_id;
     op.u.ctrl.subop = subop;
     op.u.ctrl.cli_id = cli_id;
-    set_xen_guest_handle(op.u.ctrl.buf,buf);
     op.u.ctrl.arg1 = arg1;
     op.u.ctrl.arg2 = arg2;
     /* use xc_tmem_control_oid if arg3 is required */
@@ -68,25 +70,28 @@ int xc_tmem_control(xc_interface *xch,
     op.u.ctrl.oid[1] = 0;
     op.u.ctrl.oid[2] = 0;
 
-    if (subop == TMEMC_LIST) {
-        if ((arg1 != 0) && (lock_pages(xch, buf, arg1) != 0))
-        {
-            PERROR("Could not lock memory for Xen hypercall");
-            return -ENOMEM;
-        }
-    }
-
 #ifdef VALGRIND
     if (arg1 != 0)
         memset(buf, 0, arg1);
 #endif
 
+    if ( subop == TMEMC_LIST && arg1 != 0 )
+    {
+        if ( buf == NULL )
+            return -EINVAL;
+        if ( xc_hypercall_bounce_pre(xch, buf) )
+        {
+            PERROR("Could not bounce buffer for tmem control hypercall");
+            return -ENOMEM;
+        }
+    }
+
+    xc_set_xen_guest_handle(op.u.ctrl.buf, buf);
+
     rc = do_tmem_op(xch, &op);
 
-    if (subop == TMEMC_LIST) {
-        if (arg1 != 0)
-            unlock_pages(xch, buf, arg1);
-    }
+    if (subop == TMEMC_LIST && arg1 != 0)
+            xc_hypercall_bounce_post(xch, buf);
 
     return rc;
 }
@@ -101,6 +106,7 @@ int xc_tmem_control_oid(xc_interface *xc
                         void *buf)
 {
     tmem_op_t op;
+    DECLARE_HYPERCALL_BOUNCE(buf, arg1, XC_HYPERCALL_BUFFER_BOUNCE_OUT);
     int rc;
 
     op.cmd = TMEM_CONTROL;
@@ -114,25 +120,28 @@ int xc_tmem_control_oid(xc_interface *xc
     op.u.ctrl.oid[1] = oid.oid[1];
     op.u.ctrl.oid[2] = oid.oid[2];
 
-    if (subop == TMEMC_LIST) {
-        if ((arg1 != 0) && (lock_pages(xch, buf, arg1) != 0))
-        {
-            PERROR("Could not lock memory for Xen hypercall");
-            return -ENOMEM;
-        }
-    }
-
 #ifdef VALGRIND
     if (arg1 != 0)
         memset(buf, 0, arg1);
 #endif
 
+    if ( subop == TMEMC_LIST && arg1 != 0 )
+    {
+        if ( buf == NULL )
+            return -EINVAL;
+        if ( xc_hypercall_bounce_pre(xch, buf) )
+        {
+            PERROR("Could not bounce buffer for tmem control (OID) hypercall");
+            return -ENOMEM;
+        }
+    }
+
+    xc_set_xen_guest_handle(op.u.ctrl.buf, buf);
+
     rc = do_tmem_op(xch, &op);
 
-    if (subop == TMEMC_LIST) {
-        if (arg1 != 0)
-            unlock_pages(xch, buf, arg1);
-    }
+    if (subop == TMEMC_LIST && arg1 != 0)
+            xc_hypercall_bounce_post(xch, buf);
 
     return rc;
 }

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