# HG changeset patch
# User Ian Campbell <ian.campbell@xxxxxxxxxx>
# Date 1287650255 -3600
# Node ID f9ce4cbcfbc43e34a14493aff2c7605d17d33439
# Parent 2ef7e26cabd8919f5797a22dbd070a4a189063f1
libxc: convert tmem interface over to hypercall buffers
Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
diff -r 2ef7e26cabd8 -r f9ce4cbcfbc4 tools/libxc/xc_tmem.c
--- a/tools/libxc/xc_tmem.c Thu Oct 21 09:37:35 2010 +0100
+++ b/tools/libxc/xc_tmem.c Thu Oct 21 09:37:35 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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