xen/23904-xenpaging_use_p2m-get_entry_in_p2m_mem_paging_functions.patch

changeset:   23904:ecab267b85ef
user:        Olaf Hering <olaf@aepfle.de>
date:        Thu Oct 06 12:33:17 2011 +0100
files:       xen/arch/x86/mm/p2m.c
description:
xenpaging: use p2m->get_entry() in p2m_mem_paging functions

Use p2m->get_entry() in the p2m_mem_paging functions. This preserves the
p2m_access type when gfn is updated with set_p2m_entry().
Its also a preparation for locking fixes in a subsequent patch.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Tim Deegan <tim@xen.org>
Committed-by: Tim Deegan <tim@xen.org>


---
 xen/arch/x86/mm/p2m.c |   25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

Index: xen-4.1.2-testing/xen/arch/x86/mm/p2m.c
===================================================================
--- xen-4.1.2-testing.orig/xen/arch/x86/mm/p2m.c
+++ xen-4.1.2-testing/xen/arch/x86/mm/p2m.c
@@ -2839,10 +2839,11 @@ int p2m_mem_paging_nominate(struct p2m_d
 {
     struct page_info *page;
     p2m_type_t p2mt;
+    p2m_access_t a;
     mfn_t mfn;
     int ret;
 
-    mfn = gfn_to_mfn(p2m, gfn, &p2mt);
+    mfn = p2m->get_entry(p2m, gfn, &p2mt, &a, p2m_query);
 
     /* Check if mfn is valid */
     ret = -EINVAL;
@@ -2869,7 +2870,7 @@ int p2m_mem_paging_nominate(struct p2m_d
 
     /* Fix p2m entry */
     p2m_lock(p2m);
-    set_p2m_entry(p2m, gfn, mfn, 0, p2m_ram_paging_out, p2m->default_access);
+    set_p2m_entry(p2m, gfn, mfn, 0, p2m_ram_paging_out, a);
     audit_p2m(p2m, 1);
     p2m_unlock(p2m);
 
@@ -2883,11 +2884,12 @@ int p2m_mem_paging_evict(struct p2m_doma
 {
     struct page_info *page;
     p2m_type_t p2mt;
+    p2m_access_t a;
     mfn_t mfn;
     struct domain *d = p2m->domain;
 
     /* Get mfn */
-    mfn = gfn_to_mfn(p2m, gfn, &p2mt);
+    mfn = p2m->get_entry(p2m, gfn, &p2mt, &a, p2m_query);
     if ( unlikely(!mfn_valid(mfn)) )
         return -EINVAL;
 
@@ -2906,7 +2908,7 @@ int p2m_mem_paging_evict(struct p2m_doma
 
     /* Remove mapping from p2m table */
     p2m_lock(p2m);
-    set_p2m_entry(p2m, gfn, _mfn(PAGING_MFN), 0, p2m_ram_paged, p2m->default_access);
+    set_p2m_entry(p2m, gfn, _mfn(PAGING_MFN), 0, p2m_ram_paged, a);
     audit_p2m(p2m, 1);
     p2m_unlock(p2m);
 
@@ -2943,6 +2945,7 @@ void p2m_mem_paging_populate(struct p2m_
     struct vcpu *v = current;
     mem_event_request_t req;
     p2m_type_t p2mt;
+    p2m_access_t a;
     struct domain *d = p2m->domain;
 
     /* Check that there's space on the ring for this request */
@@ -2955,11 +2958,11 @@ void p2m_mem_paging_populate(struct p2m_
     /* Fix p2m mapping */
     /* XXX: It seems inefficient to have this here, as it's only needed
      *      in one case (ept guest accessing paging out page) */
-    gfn_to_mfn(p2m, gfn, &p2mt);
+    p2m->get_entry(p2m, gfn, &p2mt, &a, p2m_query);
     if ( p2mt == p2m_ram_paged )
     {
         p2m_lock(p2m);
-        set_p2m_entry(p2m, gfn, _mfn(PAGING_MFN), 0, p2m_ram_paging_in_start, p2m->default_access);
+        set_p2m_entry(p2m, gfn, _mfn(PAGING_MFN), 0, p2m_ram_paging_in_start, a);
         audit_p2m(p2m, 1);
         p2m_unlock(p2m);
     }
@@ -2988,7 +2991,10 @@ void p2m_mem_paging_populate(struct p2m_
 int p2m_mem_paging_prep(struct p2m_domain *p2m, unsigned long gfn)
 {
     struct page_info *page;
+    p2m_type_t p2mt;
+    p2m_access_t a;
 
+    p2m->get_entry(p2m, gfn, &p2mt, &a, p2m_query);
     /* Get a free page */
     page = alloc_domheap_page(p2m->domain, 0);
     if ( unlikely(page == NULL) )
@@ -2996,7 +3002,7 @@ int p2m_mem_paging_prep(struct p2m_domai
 
     /* Fix p2m mapping */
     p2m_lock(p2m);
-    set_p2m_entry(p2m, gfn, page_to_mfn(page), 0, p2m_ram_paging_in, p2m->default_access);
+    set_p2m_entry(p2m, gfn, page_to_mfn(page), 0, p2m_ram_paging_in, a);
     audit_p2m(p2m, 1);
     p2m_unlock(p2m);
 
@@ -3010,6 +3016,7 @@ void p2m_mem_paging_resume(struct p2m_do
     struct domain *d = p2m->domain;
     mem_event_response_t rsp;
     p2m_type_t p2mt;
+    p2m_access_t a;
     mfn_t mfn;
 
     /* Pull the response off the ring */
@@ -3018,9 +3025,9 @@ void p2m_mem_paging_resume(struct p2m_do
     /* Fix p2m entry if the page was not dropped */
     if ( !(rsp.flags & MEM_EVENT_FLAG_DROP_PAGE) )
     {
-        mfn = gfn_to_mfn(p2m, rsp.gfn, &p2mt);
+        mfn = p2m->get_entry(p2m, rsp.gfn, &p2mt, &a, p2m_query);
         p2m_lock(p2m);
-        set_p2m_entry(p2m, rsp.gfn, mfn, 0, p2m_ram_rw, p2m->default_access);
+        set_p2m_entry(p2m, rsp.gfn, mfn, 0, p2m_ram_rw, a);
         set_gpfn_from_mfn(mfn_x(mfn), rsp.gfn);
         audit_p2m(p2m, 1);
         p2m_unlock(p2m);