[PATCH for-4.5 v6 02/17] xen: Relocate p2m_mem_access_resume to mem_access common

[Tamas K Lengyel <tklengyel@sec.in.tum.de>]

The p2m_mem_access resume function is not p2m specific and could be shared
across ARM/x86.

Signed-off-by: Tamas K Lengyel <tklengyel@sec.in.tum.de>
---
v6: Keep the comment describing the function.
v5: Style fix.
---
 xen/arch/x86/mm/p2m.c        | 24 ------------------------
 xen/common/mem_access.c      | 26 +++++++++++++++++++++++++-
 xen/common/mem_event.c       |  2 +-
 xen/include/asm-x86/p2m.h    |  2 --
 xen/include/xen/mem_access.h |  5 +++++
 5 files changed, 31 insertions(+), 28 deletions(-)

diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index a9f120a..bf8e537 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -1427,30 +1427,6 @@ bool_t p2m_mem_access_check(paddr_t gpa, unsigned long gla,
     return (p2ma == p2m_access_n2rwx);
 }
 
-void p2m_mem_access_resume(struct domain *d)
-{
-    mem_event_response_t rsp;
-
-    /* Pull all responses off the ring */
-    while( mem_event_get_response(d, &d->mem_event->access, &rsp) )
-    {
-        struct vcpu *v;
-
-        if ( rsp.flags & MEM_EVENT_FLAG_DUMMY )
-            continue;
-
-        /* Validate the vcpu_id in the response. */
-        if ( (rsp.vcpu_id >= d->max_vcpus) || !d->vcpu[rsp.vcpu_id] )
-            continue;
-
-        v = d->vcpu[rsp.vcpu_id];
-
-        /* Unpause domain */
-        if ( rsp.flags & MEM_EVENT_FLAG_VCPU_PAUSED )
-            mem_event_vcpu_unpause(v);
-    }
-}
-
 /* Set access type for a region of pfns.
  * If start_pfn == -1ul, sets the default access type */
 long p2m_set_mem_access(struct domain *d, unsigned long pfn, uint32_t nr,
diff --git a/xen/common/mem_access.c b/xen/common/mem_access.c
index 9a8c1a9..1674d7a 100644
--- a/xen/common/mem_access.c
+++ b/xen/common/mem_access.c
@@ -29,6 +29,30 @@
 #include <asm/p2m.h>
 #include <xsm/xsm.h>
 
+void mem_access_resume(struct domain *d)
+{
+    mem_event_response_t rsp;
+
+    /* Pull all responses off the ring. */
+    while ( mem_event_get_response(d, &d->mem_event->access, &rsp) )
+    {
+        struct vcpu *v;
+
+        if ( rsp.flags & MEM_EVENT_FLAG_DUMMY )
+            continue;
+
+        /* Validate the vcpu_id in the response. */
+        if ( (rsp.vcpu_id >= d->max_vcpus) || !d->vcpu[rsp.vcpu_id] )
+            continue;
+
+        v = d->vcpu[rsp.vcpu_id];
+
+        /* Unpause domain. */
+        if ( rsp.flags & MEM_EVENT_FLAG_VCPU_PAUSED )
+            mem_event_vcpu_unpause(v);
+    }
+}
+
 int mem_access_memop(unsigned long cmd,
                      XEN_GUEST_HANDLE_PARAM(xen_mem_access_op_t) arg)
 {
@@ -58,7 +82,7 @@ int mem_access_memop(unsigned long cmd,
     switch ( mao.op )
     {
     case XENMEM_access_op_resume:
-        p2m_mem_access_resume(d);
+        mem_access_resume(d);
         rc = 0;
         break;
 
diff --git a/xen/common/mem_event.c b/xen/common/mem_event.c
index 336b638..615a8b7 100644
--- a/xen/common/mem_event.c
+++ b/xen/common/mem_event.c
@@ -430,7 +430,7 @@ static void mem_paging_notification(struct vcpu *v, unsigned int port)
 static void mem_access_notification(struct vcpu *v, unsigned int port)
 {
     if ( likely(v->domain->mem_event->access.ring_page != NULL) )
-        p2m_mem_access_resume(v->domain);
+        mem_access_resume(v->domain);
 }
 
 /* Registered with Xen-bound event channel for incoming notifications. */
diff --git a/xen/include/asm-x86/p2m.h b/xen/include/asm-x86/p2m.h
index bae669e..3702bea 100644
--- a/xen/include/asm-x86/p2m.h
+++ b/xen/include/asm-x86/p2m.h
@@ -601,8 +601,6 @@ void p2m_mem_paging_resume(struct domain *d);
 bool_t p2m_mem_access_check(paddr_t gpa, unsigned long gla,
                             struct npfec npfec,
                             mem_event_request_t **req_ptr);
-/* Resumes the running of the VCPU, restarting the last instruction */
-void p2m_mem_access_resume(struct domain *d);
 
 /* Set access type for a region of pfns.
  * If start_pfn == -1ul, sets the default access type */
diff --git a/xen/include/xen/mem_access.h b/xen/include/xen/mem_access.h
index 19d1a2d..6ceb2a4 100644
--- a/xen/include/xen/mem_access.h
+++ b/xen/include/xen/mem_access.h
@@ -31,6 +31,9 @@ int mem_access_memop(unsigned long cmd,
                      XEN_GUEST_HANDLE_PARAM(xen_mem_access_op_t) arg);
 int mem_access_send_req(struct domain *d, mem_event_request_t *req);
 
+/* Resumes the running of the VCPU, restarting the last instruction */
+void mem_access_resume(struct domain *d);
+
 #else
 
 static inline
@@ -46,6 +49,8 @@ int mem_access_send_req(struct domain *d, mem_event_request_t *req)
     return -ENOSYS;
 }
 
+static inline void mem_access_resume(struct domain *d) {}
+
 #endif /* HAS_MEM_ACCESS */
 
 #endif /* _XEN_ASM_MEM_ACCESS_H */
-- 
2.1.0