/* Was the page fault caused by the Guest's page tables? */
if (is_guest_pf(guest_pde_access, shadow_pde_access) == 1) {
- PrintDebug("Injecting PDE pf to guest: (guest access error=%d) (pf error code=%d)\n",
- *(uint_t *)&guest_pde_access, *(uint_t *)&error_code);
+ PrintDebug("Injecting PDE pf to guest: (guest access error=%d) (shdw access error=%d) (pf error code=%d)\n",
+ *(uint_t *)&guest_pde_access, *(uint_t *)&shadow_pde_access, *(uint_t *)&error_code);
if (inject_guest_pf(info, fault_addr, error_code) == -1) {
- PrintError("Could not inject guest page fault\n");
+ PrintError("Could not inject guest page fault for vaddr %p\n", (void *)fault_addr);
return -1;
}
return 0;
shadow_pde_access, guest_pde_access);
if (inject_guest_pf(info, fault_addr, error_code) == -1) {
- PrintError("Could not inject guest page fault\n");
+ PrintError("Could not inject guest page fault for vaddr %p\n", (void *)fault_addr);
return -1;
}
return 0;
(shadow_pde_access != PT_ACCESS_OK)) {
// inject page fault in guest
if (inject_guest_pf(info, fault_addr, error_code) == -1) {
- PrintError("Could not inject guest page fault\n");
+ PrintError("Could not inject guest page fault for vaddr %p\n", (void *)fault_addr);
return -1;
}
PrintDebug("Unknown Error occurred (shadow_pde_access=%d)\n", shadow_pde_access);
}
-
static int handle_pte_shadow_pagefault_32(struct guest_info * info, addr_t fault_addr, pf_error_t error_code,
pte32_t * shadow_pt, pte32_t * guest_pt) {
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)) {
- 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);
+ pf_error_t swap_perms;
+
+
+ /*
+ int sym_ret = v3_get_vaddr_perms(info, fault_addr, guest_pte, &swap_perms);
+ sym_ret = 0;
+ */
+ addr_t swp_pg_addr = 0;
+
+
+
+#ifdef CONFIG_SYMBIOTIC_SWAP_TELEMETRY
+ if (error_code.write == 0) {
+ info->swap_state.read_faults++;
+ } else {
+ info->swap_state.write_faults++;
+ }
+#endif
+
+
+ swp_pg_addr = v3_get_swapped_pg_addr(info, guest_pte);
+
+ if (swp_pg_addr != 0) {
+ PrintDebug("Swapped page address=%p\n", (void *)swp_pg_addr);
+
+ /*
+ if (info->cpl == 0) {
+ PrintError("Swapped Page fault in kernel mode.... bad...\n");
+ goto inject;
+ }
+ */
+
+ int sym_ret = v3_get_vaddr_perms(info, fault_addr, guest_pte, &swap_perms);
- if (swp_pg_addr == 0) {
- if (inject_guest_pf(info, fault_addr, error_code) == -1) {
- PrintError("Could not inject guest page fault\n");
+ if (sym_ret == -1) {
+ PrintError("Symcall error...\n");
return -1;
+ } else if (sym_ret == 0) {
+
+
+ if (swap_perms.present == 0) {
+ PrintError("Nonpresent swapped page\n");
+ }
+
+ // swap_perms.write ==1 || error_code.write == 0
+ // swap_perms.user == 0 || error_code.user == 1
+
+ // This checks for permissions violations that require a guest PF injection
+ if ( (swap_perms.present == 1) &&
+ ( (swap_perms.write == 1) ||
+ (error_code.write == 0) ) &&
+ ( (swap_perms.user == 1) ||
+ (error_code.user == 0) ) ) {
+ addr_t swp_pg_pa = 0;
+
+ swp_pg_pa = v3_map_swp_page(info, shadow_pte, guest_pte, (void *)swp_pg_addr);
+
+ PrintDebug("Page fault on swapped out page (vaddr=%p) (pte=%x) (error_code=%x)\n",
+ (void *)fault_addr, *(uint32_t *)guest_pte, *(uint32_t *)&error_code);
+
+ shadow_pte->writable = swap_perms.write;
+ shadow_pte->user_page = swap_perms.user;
+
+ shadow_pte->write_through = 0;
+ shadow_pte->cache_disable = 0;
+ shadow_pte->global_page = 0;
+
+ shadow_pte->present = 1;
+
+ shadow_pte->page_base_addr = swp_pg_pa;
+
+#ifdef CONFIG_SYMBIOTIC_SWAP_TELEMETRY
+ info->swap_state.mapped_pages++;
+#endif
+ // PrintError("Swap fault handled\n");
+ return 0;
+ }
}
} 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) {
- PrintError("Could not inject guest page fault\n");
- return -1;
+ PrintDebug("Not a sym swappable page\n");
}
+
}
-#else
+#endif
+ // inject:
+
if (inject_guest_pf(info, fault_addr, error_code) == -1) {
- PrintError("Could not inject guest page fault\n");
+ PrintError("Could not inject guest page fault for vaddr %p\n", (void *)fault_addr);
return -1;
- }
-#endif
+ }
return 0;
}
} else {
// Inject page fault into the guest
if (inject_guest_pf(info, fault_addr, error_code) == -1) {
- PrintError("Could not inject guest page fault\n");
+ PrintError("Could not inject guest page fault for vaddr %p\n", (void *)fault_addr);
return -1;
}
