[PATCH v4 06/20] xen/sysctl: wrap around XEN_SYSCTL_readconsole

[Penny Zheng <Penny.Zheng@xxxxxxx>]

The following functions is to deal with XEN_SYSCTL_readconsole sub-op, and
shall be wrapped:
- xsm_readconsole()
- read_console_ring()

Signed-off-by: Penny Zheng <Penny.Zheng@xxxxxxx>
Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
v2 -> v3:
- move #endif up ahead of the blank line
---
v3 -> v4:
- remove transient "#ifdef CONFIG_SYSCTL"
---
 xen/drivers/char/console.c | 2 ++
 xen/include/xsm/xsm.h      | 4 ++++
 xen/xsm/dummy.c            | 2 +-
 xen/xsm/flask/hooks.c      | 4 ++--
 4 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/xen/drivers/char/console.c b/xen/drivers/char/console.c
index c15987f5bb..2413cd6c51 100644
--- a/xen/drivers/char/console.c
+++ b/xen/drivers/char/console.c
@@ -368,6 +368,7 @@ static void conring_puts(const char *str, size_t len)
         conringc = conringp - conring_size;
 }
 
+#ifdef CONFIG_SYSCTL
 long read_console_ring(struct xen_sysctl_readconsole *op)
 {
     XEN_GUEST_HANDLE_PARAM(char) str;
@@ -410,6 +411,7 @@ long read_console_ring(struct xen_sysctl_readconsole *op)
 
     return 0;
 }
+#endif /* CONFIG_SYSCTL */
 
 
 /*
diff --git a/xen/include/xsm/xsm.h b/xen/include/xsm/xsm.h
index 22e2429f52..042a99449f 100644
--- a/xen/include/xsm/xsm.h
+++ b/xen/include/xsm/xsm.h
@@ -270,7 +270,11 @@ static inline int xsm_sysctl(xsm_default_t def, int cmd)
 
 static inline int xsm_readconsole(xsm_default_t def, uint32_t clear)
 {
+#ifdef CONFIG_SYSCTL
     return alternative_call(xsm_ops.readconsole, clear);
+#else
+    return -EOPNOTSUPP;
+#endif
 }
 
 static inline int xsm_evtchn_unbound(
diff --git a/xen/xsm/dummy.c b/xen/xsm/dummy.c
index 93a0665ecc..cd0e844fcf 100644
--- a/xen/xsm/dummy.c
+++ b/xen/xsm/dummy.c
@@ -24,8 +24,8 @@ static const struct xsm_ops __initconst_cf_clobber dummy_ops 
= {
     .domctl                        = xsm_domctl,
 #ifdef CONFIG_SYSCTL
     .sysctl                        = xsm_sysctl,
-#endif
     .readconsole                   = xsm_readconsole,
+#endif
 
     .evtchn_unbound                = xsm_evtchn_unbound,
     .evtchn_interdomain            = xsm_evtchn_interdomain,
diff --git a/xen/xsm/flask/hooks.c b/xen/xsm/flask/hooks.c
index 3a43e5a1d6..df7e10775b 100644
--- a/xen/xsm/flask/hooks.c
+++ b/xen/xsm/flask/hooks.c
@@ -934,7 +934,6 @@ static int cf_check flask_sysctl(int cmd)
         return avc_unknown_permission("sysctl", cmd);
     }
 }
-#endif /* CONFIG_SYSCTL */
 
 static int cf_check flask_readconsole(uint32_t clear)
 {
@@ -945,6 +944,7 @@ static int cf_check flask_readconsole(uint32_t clear)
 
     return domain_has_xen(current->domain, perms);
 }
+#endif /* CONFIG_SYSCTL */
 
 static inline uint32_t resource_to_perm(uint8_t access)
 {
@@ -1888,8 +1888,8 @@ static const struct xsm_ops __initconst_cf_clobber 
flask_ops = {
     .domctl = flask_domctl,
 #ifdef CONFIG_SYSCTL
     .sysctl = flask_sysctl,
-#endif
     .readconsole = flask_readconsole,
+#endif
 
     .evtchn_unbound = flask_evtchn_unbound,
     .evtchn_interdomain = flask_evtchn_interdomain,
-- 
2.34.1