ARM architecture does not implement I/O ports. Ignore this call on ARM
to avoid the overhead of making a hypercall just for Xen to return
-ENOSYS.
Signed-off-by: Rahul Singh <rahul.si...@arm.com>
Reviewed-by: Stefano Stabellini <sstabell...@kernel.org>
---
Change in v3: Added Reviewed-by: Stefano Stabellini <sstabell...@kernel.org>
Change in v2:
- Instead of returning success in XEN, ignored the call in xl.
---
tools/libs/ctrl/xc_domain.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/tools/libs/ctrl/xc_domain.c b/tools/libs/ctrl/xc_domain.c
index 23322b70b5..25c95f6596 100644
--- a/tools/libs/ctrl/xc_domain.c
+++ b/tools/libs/ctrl/xc_domain.c
@@ -1348,6 +1348,14 @@ int xc_domain_ioport_permission(xc_interface *xch,
uint32_t nr_ports,
uint32_t allow_access)
{
+#if defined(__arm__) || defined(__aarch64__)
+ /*
+ * The ARM architecture does not implement I/O ports.
+ * Avoid the overhead of making a hypercall just for Xen to return -ENOSYS.
+ * It is safe to ignore this call on ARM so we just return 0.
+ */
+ return 0;
+#else
DECLARE_DOMCTL;
domctl.cmd = XEN_DOMCTL_ioport_permission;
@@ -1357,6 +1365,7 @@ int xc_domain_ioport_permission(xc_interface *xch,
domctl.u.ioport_permission.allow_access = allow_access;
return do_domctl(xch, &domctl);
+#endif
}
int xc_availheap(xc_interface *xch,
--
2.17.1
