[Xen-devel] [PATCH v4 07/16] xen/mem_event: Abstract architecture specific sanity checks

[Tamas K Lengyel <tklengyel@xxxxxxxxxxxxx>]

Move architecture specific sanity checks into its own function
which is called when enabling mem_event.

Signed-off-by: Tamas K Lengyel <tklengyel@xxxxxxxxxxxxx>
---
v4: Style fix.
v2: Move sanity check function into architecture specific p2m.h
---
 xen/common/mem_event.c    |  7 +------
 xen/include/asm-x86/p2m.h | 14 ++++++++++++++
 2 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/xen/common/mem_event.c b/xen/common/mem_event.c
index b31bb9d..fbbed43 100644
--- a/xen/common/mem_event.c
+++ b/xen/common/mem_event.c
@@ -594,12 +594,7 @@ int mem_event_domctl(struct domain *d, 
xen_domctl_mem_event_op_t *mec,
         case XEN_DOMCTL_MEM_EVENT_OP_ACCESS_ENABLE:
         {
             rc = -ENODEV;
-            /* Only HAP is supported */
-            if ( !hap_enabled(d) )
-                break;
-
-            /* Currently only EPT is supported */
-            if ( !cpu_has_vmx )
+            if ( !p2m_mem_event_sanity_check(d) )
                 break;
 
             rc = mem_event_enable(d, mec, med, _VPF_mem_access,
diff --git a/xen/include/asm-x86/p2m.h b/xen/include/asm-x86/p2m.h
index ae755bc..14be50f 100644
--- a/xen/include/asm-x86/p2m.h
+++ b/xen/include/asm-x86/p2m.h
@@ -611,6 +611,20 @@ long p2m_set_mem_access(struct domain *d, unsigned long 
start_pfn, uint32_t nr,
 int p2m_get_mem_access(struct domain *d, unsigned long pfn,
                        xenmem_access_t *access);
 
+/* Sanity check for mem_event hardware support */
+static inline bool_t p2m_mem_event_sanity_check(struct domain *d)
+{
+    /* Only HAP is supported */
+    if ( !hap_enabled(d) )
+        return 0;
+
+    /* Currently only EPT is supported */
+    if ( !cpu_has_vmx )
+        return 0;
+
+    return 1;
+}
+
 /* 
  * Internal functions, only called by other p2m code
  */
-- 
2.1.0


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