[PATCH v7 01/25] xen: allow console_io hypercalls from certain DomUs

[Stefano Stabellini <sstabellini@kernel.org>]

Introduce an is_console option to allow certain classes of domUs to use
the Xen console. Specifically, it will be used to give console access to
all domUs started from Xen from information on device tree.

Signed-off-by: Stefano Stabellini <stefanos@xilinx.com>
Acked-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
CC: andrew.cooper3@citrix.com
CC: George.Dunlap@eu.citrix.com
CC: ian.jackson@eu.citrix.com
CC: jbeulich@suse.com
CC: konrad.wilk@oracle.com
CC: tim@xen.org
CC: wei.liu2@citrix.com
CC: dgdegra@tycho.nsa.gov
---
Changes in v3:
- remove changes to hooks.c

Changes in v2:
- introduce is_console
- remove #ifdefs
---
 xen/include/xen/sched.h | 2 ++
 xen/include/xsm/dummy.h | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index 0ba80cb..abcc74e 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -379,6 +379,8 @@ struct domain
     bool             auto_node_affinity;
     /* Is this guest fully privileged (aka dom0)? */
     bool             is_privileged;
+    /* Can this guest access the Xen console? */
+    bool             is_console;
     /* Is this a xenstore domain (not dom0)? */
     bool             is_xenstore;
     /* Domain's VCPUs are pinned 1:1 to physical CPUs? */
diff --git a/xen/include/xsm/dummy.h b/xen/include/xsm/dummy.h
index b0ac1f6..29d7b50 100644
--- a/xen/include/xsm/dummy.h
+++ b/xen/include/xsm/dummy.h
@@ -230,6 +230,8 @@ static XSM_INLINE int xsm_memory_stat_reservation(XSM_DEFAULT_ARG struct domain
 static XSM_INLINE int xsm_console_io(XSM_DEFAULT_ARG struct domain *d, int cmd)
 {
     XSM_ASSERT_ACTION(XSM_OTHER);
+    if ( d->is_console )
+        return xsm_default_action(XSM_HOOK, d, NULL);
 #ifdef CONFIG_VERBOSE_DEBUG
     if ( cmd == CONSOLEIO_write )
         return xsm_default_action(XSM_HOOK, d, NULL);
-- 
1.9.1


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