[PATCH] xen/xsm: Wire up get_dom0_console

[Jason Andryuk <jason.andryuk@xxxxxxx>]

An XSM hook for get_dom0_console is currently missing.  Using XSM with
a PVH dom0 shows:
(XEN) FLASK: Denying unknown platform_op: 64.

Wire up the hook, and allow it for dom0.

Fixes: 4dd160583c ("x86/platform: introduce hypercall to get initial video 
console settings")
Signed-off-by: Jason Andryuk <jason.andryuk@xxxxxxx>
---
 tools/flask/policy/modules/dom0.te  | 2 +-
 xen/xsm/flask/hooks.c               | 4 ++++
 xen/xsm/flask/policy/access_vectors | 2 ++
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/flask/policy/modules/dom0.te 
b/tools/flask/policy/modules/dom0.te
index f1dcff48e2..16b8c9646d 100644
--- a/tools/flask/policy/modules/dom0.te
+++ b/tools/flask/policy/modules/dom0.te
@@ -16,7 +16,7 @@ allow dom0_t xen_t:xen {
 allow dom0_t xen_t:xen2 {
        resource_op psr_cmt_op psr_alloc pmu_ctrl get_symbol
        get_cpu_levelling_caps get_cpu_featureset livepatch_op
-       coverage_op
+       coverage_op get_dom0_console
 };
 
 # Allow dom0 to use all XENVER_ subops that have checks.
diff --git a/xen/xsm/flask/hooks.c b/xen/xsm/flask/hooks.c
index 78225f68c1..5e88c71b8e 100644
--- a/xen/xsm/flask/hooks.c
+++ b/xen/xsm/flask/hooks.c
@@ -1558,6 +1558,10 @@ static int cf_check flask_platform_op(uint32_t op)
         return avc_has_perm(domain_sid(current->domain), SECINITSID_XEN,
                             SECCLASS_XEN2, XEN2__GET_SYMBOL, NULL);
 
+    case XENPF_get_dom0_console:
+        return avc_has_perm(domain_sid(current->domain), SECINITSID_XEN,
+                            SECCLASS_XEN2, XEN2__GET_DOM0_CONSOLE, NULL);
+
     default:
         return avc_unknown_permission("platform_op", op);
     }
diff --git a/xen/xsm/flask/policy/access_vectors 
b/xen/xsm/flask/policy/access_vectors
index 4e6710a63e..a35e3d4c51 100644
--- a/xen/xsm/flask/policy/access_vectors
+++ b/xen/xsm/flask/policy/access_vectors
@@ -99,6 +99,8 @@ class xen2
     livepatch_op
 # XEN_SYSCTL_coverage_op
     coverage_op
+# XENPF_get_dom0_console
+    get_dom0_console
 }
 
 # Classes domain and domain2 consist of operations that a domain performs on
-- 
2.44.0