[PATCH] nestedhvm: initialize pfec for l1 pagetable walk

[Christoph Egger <Christoph.Egger@amd.com>]

[-- Attachment #1: Type: text/plain, Size: 392 bytes --]


Initialize pfec for l1 pagetable walk.

Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>
CC: Tim Deegan <tim@xen.org>


-- 
---to satisfy European Law for business letters:
Advanced Micro Devices GmbH
Einsteinring 24, 85689 Dornach b. Muenchen
Geschaeftsfuehrer: Alberto Bozzo, Andrew Bowd
Sitz: Dornach, Gemeinde Aschheim, Landkreis Muenchen
Registergericht Muenchen, HRB Nr. 43632

[-- Attachment #2: xen_nh_p2m.diff --]
[-- Type: text/plain, Size: 2234 bytes --]

diff -r c69ef56d8afc xen/arch/x86/hvm/hvm.c
--- a/xen/arch/x86/hvm/hvm.c	Tue Jul 03 11:44:28 2012 +0200
+++ b/xen/arch/x86/hvm/hvm.c	Fri Jul 13 17:15:55 2012 +0200
@@ -1278,7 +1278,8 @@ int hvm_hap_nested_page_fault(unsigned l
          * into l1 guest if not fixable. The algorithm is
          * the same as for shadow paging.
          */
-        rv = nestedhvm_hap_nested_page_fault(v, gpa);
+        rv = nestedhvm_hap_nested_page_fault(v, gpa,
+                                             access_r, access_w, access_x);
         switch (rv) {
         case NESTEDHVM_PAGEFAULT_DONE:
             return 1;
diff -r c69ef56d8afc xen/arch/x86/mm/hap/nested_hap.c
--- a/xen/arch/x86/mm/hap/nested_hap.c	Tue Jul 03 11:44:28 2012 +0200
+++ b/xen/arch/x86/mm/hap/nested_hap.c	Fri Jul 13 17:15:55 2012 +0200
@@ -177,13 +177,20 @@ out:
  */
 static int
 nestedhap_walk_L1_p2m(struct vcpu *v, paddr_t L2_gpa, paddr_t *L1_gpa,
-                      unsigned int *page_order)
+                      unsigned int *page_order,
+                      bool_t access_r, bool_t access_w, bool_t access_x)
 {
     uint32_t pfec;
     unsigned long nested_cr3, gfn;
     
     nested_cr3 = nhvm_vcpu_hostcr3(v);
 
+    pfec = PFEC_user_mode | PFEC_page_present;
+    if (access_w)
+        pfec |= PFEC_write_access;
+    if (access_x)
+        pfec |= PFEC_insn_fetch;
+
     /* Walk the guest-supplied NPT table, just as if it were a pagetable */
     gfn = paging_ga_to_gfn_cr3(v, nested_cr3, L2_gpa, &pfec, page_order);
 
@@ -200,7 +207,8 @@ nestedhap_walk_L1_p2m(struct vcpu *v, pa
  * Returns:
  */
 int
-nestedhvm_hap_nested_page_fault(struct vcpu *v, paddr_t L2_gpa)
+nestedhvm_hap_nested_page_fault(struct vcpu *v, paddr_t L2_gpa,
+    bool_t access_r, bool_t access_w, bool_t access_x)
 {
     int rv;
     paddr_t L1_gpa, L0_gpa;
@@ -212,7 +220,8 @@ nestedhvm_hap_nested_page_fault(struct v
     nested_p2m = p2m_get_nestedp2m(v, nhvm_vcpu_hostcr3(v));
 
     /* walk the L1 P2M table */
-    rv = nestedhap_walk_L1_p2m(v, L2_gpa, &L1_gpa, &page_order_21);
+    rv = nestedhap_walk_L1_p2m(v, L2_gpa, &L1_gpa, &page_order_21,
+        access_r, access_w, access_x);
 
     /* let caller to handle these two cases */
     switch (rv) {

[-- Attachment #3: Type: text/plain, Size: 126 bytes --]

_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel