symbiotic swap implementation (unsafe for kernel pages)

[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 4614232..2760400 100644 (file)
--- a/palacios/src/palacios/vmm_shadow_paging_32.h
+++ b/palacios/src/palacios/vmm_shadow_paging_32.h
@@ -33,6 +33,10 @@ static inline int activate_shadow_pt_32(struct guest_info * info) {
     shadow_cr3->pwt = guest_cr3->pwt;
     shadow_cr3->pcd = guest_cr3->pcd;
   
+#ifdef CONFIG_SYMBIOTIC_SWAP
+    v3_swap_flush(info);
+#endif
+
     return 0;
 }
 
@@ -228,9 +232,29 @@ static int handle_pte_shadow_pagefault_32(struct guest_info * info, addr_t fault
        if (is_swapped_pte32(guest_pte)) {
            PrintError("Page fault on swapped out page (pte=%x)\n", *(uint32_t *)guest_pte);
 
-           if (inject_guest_pf(info, fault_addr, error_code) == -1) {
-               PrintError("Could not inject guest page fault\n");
-               return -1;
+           addr_t swp_pg_addr = v3_get_swapped_pg_addr(info, shadow_pte, guest_pte);
+
+           if (swp_pg_addr == 0) {
+               if (inject_guest_pf(info, fault_addr, error_code) == -1) {
+                   PrintError("Could not inject guest page fault\n");
+                   return -1;
+               }
+           } else {
+               /* 
+                *  Setup shadow paging state
+                */
+               
+               /* We need some way to check permissions.... */
+
+               shadow_pte->accessed = 1;
+               shadow_pte->writable = 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;
            }
        } else {
            if (inject_guest_pf(info, fault_addr, error_code) == -1) {