symbiotic swap updates

[palacios.git] / palacios / src / palacios / vmm_shadow_paging_32.h

diff --git a/palacios/src/palacios/vmm_shadow_paging_32.h b/palacios/src/palacios/vmm_shadow_paging_32.h
index 2760400..03e1f7a 100644 (file)
--- a/palacios/src/palacios/vmm_shadow_paging_32.h
+++ b/palacios/src/palacios/vmm_shadow_paging_32.h
@@ -229,7 +229,7 @@ static int handle_pte_shadow_pagefault_32(struct guest_info * info, addr_t fault
        PrintDebug("Access error injecting pf to guest (guest access error=%d) (pf error code=%d)\n", 
                   guest_pte_access, *(uint_t*)&error_code);
 #ifdef CONFIG_SYMBIOTIC_SWAP
-       if (is_swapped_pte32(guest_pte)) {
+       if ((error_code.write == 0) && (is_swapped_pte32(guest_pte))) {
            PrintError("Page fault on swapped out page (pte=%x)\n", *(uint32_t *)guest_pte);
 
            addr_t swp_pg_addr = v3_get_swapped_pg_addr(info, shadow_pte, guest_pte);
@@ -245,13 +245,20 @@ static int handle_pte_shadow_pagefault_32(struct guest_info * info, addr_t fault
                 */
                
                /* We need some way to check permissions.... */
-
+               
                shadow_pte->accessed = 1;
-               shadow_pte->writable = 1;
+               shadow_pte->writable = 0;
+
+               if (fault_addr & 0xc0000000) {
+                   shadow_pte->user_page = 0;
+               } else {
+                   shadow_pte->user_page = 1;
+               }
+
                shadow_pte->write_through = 0;
                shadow_pte->cache_disable = 0;
                shadow_pte->global_page = 0;
-               shadow_pte->user_page = 1;
+       
                shadow_pte->present = 1;
                
                shadow_pte->page_base_addr = swp_pg_addr;