#include <palacios/vmm_shadow_paging.h>
+
#include <palacios/vmm.h>
#include <palacios/vm_guest_mem.h>
state->guest_mode = PDE32;
state->shadow_mode = PDE32;
- state->guest_cr3.r_reg = 0;
- state->shadow_cr3.r_reg = 0;
+ state->guest_cr3 = 0;
+ state->shadow_cr3 = 0;
return 0;
}
-
-int wholesale_update_shadow_page_state(struct guest_info * guest_info) {
- unsigned i, j;
- pde32_t * guest_pde;
- pde32_t * shadow_pde;
+int handle_shadow_pagefault(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) {
+ if (info->cpu_mode == PROTECTED_PG) {
+ return handle_shadow_pagefault32(info, fault_addr, error_code);
+ } else {
+ return -1;
+ }
+}
- struct shadow_page_state * state = &(guest_info->shdw_pg_state);
+int handle_shadow_pagefault32(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) {
+ pde32_t * guest_pde = NULL;
+ pde32_t * shadow_pde = (pde32_t *)CR3_TO_PDE32(info->shdw_pg_state.shadow_cr3);
+ addr_t guest_cr3 = CR3_TO_PDE32(info->shdw_pg_state.guest_cr3);
- // For now, we'll only work with PDE32
- if (state->guest_mode != PDE32) {
+ if (guest_pa_to_host_va(info, guest_cr3, (addr_t*)&guest_pde) == -1) {
return -1;
}
- shadow_pde = (pde32_t *)(CR3_TO_PDE32(state->shadow_cr3.e_reg.low));
-
- if (host_pa_to_host_va(CR3_TO_PDE32(state->guest_cr3.e_reg.low), (addr_t*)&guest_pde) != 0) {
- return -1;
+ if (error_code.present == 0) {
+ // Faulted because page was not present...
+ if (shadow_pde[PDE32_INDEX(fault_addr)].present) {
+
+
+ } else {
+ return -1;
+ }
}
- // Delete the current page table
- delete_page_tables_pde32(shadow_pde);
+ // Checks:
+ // Shadow PDE
+ // Guest PDE
+ // Shadow PTE
+ // Guest PTE
+ // Mem Map
+
+ return -1;
+}
- shadow_pde = os_hooks->allocate_pages(1);
- state->shadow_cr3.e_reg.low = (addr_t)shadow_pde;
+addr_t create_new_shadow_pt32(struct guest_info * info) {
+ void * host_pde = 0;
- state->shadow_mode = PDE32;
+ V3_AllocPages(host_pde, 1);
+ memset(host_pde, 0, PAGE_SIZE);
+
+ return (addr_t)host_pde;
+}
- for (i = 0; i < MAX_PDE32_ENTRIES; i++) {
- shadow_pde[i] = guest_pde[i];
- // The shadow can be identical to the guest if it's not present
- if (!shadow_pde[i].present) {
- continue;
- }
- if (shadow_pde[i].large_pages) {
- // large page - just map it through shadow map to generate its physical location
- addr_t guest_addr = PAGE_ADDR(shadow_pde[i].pt_base_addr);
- addr_t host_addr;
- shadow_region_t * ent;
- ent = get_shadow_region_by_addr(&(guest_info->mem_map), guest_addr);
-
- if (!ent) {
- // FIXME Panic here - guest is trying to map to physical memory
- // it does not own in any way!
- return -1;
+addr_t setup_shadow_pt32(struct guest_info * info, addr_t virt_cr3) {
+ addr_t cr3_guest_addr = CR3_TO_PDE32(virt_cr3);
+ pde32_t * guest_pde;
+ pde32_t * host_pde = NULL;
+ int i;
+
+ // Setup up guest_pde to point to the PageDir in host addr
+ if (guest_pa_to_host_va(info, cr3_guest_addr, (addr_t*)&guest_pde) == -1) {
+ return 0;
+ }
+
+ V3_AllocPages(host_pde, 1);
+ memset(host_pde, 0, PAGE_SIZE);
+
+ for (i = 0; i < MAX_PDE32_ENTRIES; i++) {
+ if (guest_pde[i].present == 1) {
+ addr_t pt_host_addr;
+ addr_t host_pte;
+
+ if (guest_pa_to_host_va(info, PDE32_T_ADDR(guest_pde[i]), &pt_host_addr) == -1) {
+ return 0;
}
- // FIXME Bounds check here to see if it's trying to trick us
-
- switch (ent->host_type) {
- case HOST_REGION_PHYSICAL_MEMORY:
- // points into currently allocated physical memory, so we just
- // set up the shadow to point to the mapped location
- if (guest_pa_to_host_pa(guest_info, guest_addr, &host_addr)) {
- // Panic here
- return -1;
- }
-
- shadow_pde[i].pt_base_addr = PAGE_ALIGNED_ADDR(host_addr);
- // FIXME set vmm_info bits here
- break;
- case HOST_REGION_UNALLOCATED:
- // points to physical memory that is *allowed* but that we
- // have not yet allocated. We mark as not present and set a
- // bit to remind us to allocate it later
- shadow_pde[i].present = 0;
- // FIXME Set vminfo bits here so that we know that we will be
- // allocating it later
- break;
- case HOST_REGION_NOTHING:
- // points to physical memory that is NOT ALLOWED.
- // We will mark it as not present and set a bit to remind
- // us that it's bad later and insert a GPF then
- shadow_pde[i].present = 0;
- break;
- case HOST_REGION_MEMORY_MAPPED_DEVICE:
- case HOST_REGION_REMOTE:
- case HOST_REGION_SWAPPED:
- default:
- // Panic. Currently unhandled
- return -1;
- break;
+ if ((host_pte = setup_shadow_pte32(info, pt_host_addr)) == 0) {
+ return 0;
}
- } else {
- pte32_t * guest_pte;
- pte32_t * shadow_pte;
- addr_t guest_addr;
- addr_t guest_pte_host_addr;
- shadow_region_t * ent;
- // small page - set PDE and follow down to the child table
- shadow_pde[i] = guest_pde[i];
+ host_pde[i].present = 1;
+ host_pde[i].pt_base_addr = PD32_BASE_ADDR(host_pte);
- guest_addr = PAGE_ADDR(guest_pde[i].pt_base_addr);
+ //
+ // Set Page DIR flags
+ //
+ }
+ }
- // Allocate a new second level page table for the shadow
- shadow_pte = os_hooks->allocate_pages(1);
+ PrintDebugPageTables(host_pde);
- // make our first level page table in the shadow point to it
- shadow_pde[i].pt_base_addr = PAGE_ALIGNED_ADDR(shadow_pte);
-
- ent = get_shadow_region_by_addr(&(guest_info->mem_map), guest_addr);
-
+ return (addr_t)host_pde;
+}
- /* JRL: This is bad.... */
- // For now the guest Page Table must always be mapped to host physical memory
- /* If we swap out a page table or if it isn't present for some reason, this turns real ugly */
- if ((!ent) || (ent->host_type != HOST_REGION_PHYSICAL_MEMORY)) {
- // FIXME Panic here - guest is trying to map to physical memory
- // it does not own in any way!
- return -1;
- }
- // Address of the relevant second level page table in the guest
- if (guest_pa_to_host_pa(guest_info, guest_addr, &guest_pte_host_addr)) {
- // Panic here
- return -1;
- }
+addr_t setup_shadow_pte32(struct guest_info * info, addr_t pt_host_addr) {
+ pte32_t * guest_pte = (pte32_t *)pt_host_addr;
+ pte32_t * host_pte = NULL;
+ int i;
+ V3_AllocPages(host_pte, 1);
+ memset(host_pte, 0, PAGE_SIZE);
- // host_addr now contains the host physical address for the guest's 2nd level page table
- // Now we transform it to relevant virtual address
- guest_pte = os_hooks->paddr_to_vaddr((void *)guest_pte_host_addr);
+ for (i = 0; i < MAX_PTE32_ENTRIES; i++) {
+ if (guest_pte[i].present == 1) {
+ addr_t guest_pa = PTE32_T_ADDR(guest_pte[i]);
+ shadow_mem_type_t page_type;
+ addr_t host_pa = 0;
- // Now we walk through the second level guest page table
- // and clone it into the shadow
- for (j = 0; j < MAX_PTE32_ENTRIES; j++) {
- shadow_pte[j] = guest_pte[j];
+ page_type = get_shadow_addr_type(info, guest_pa);
- addr_t guest_addr = PAGE_ADDR(shadow_pte[j].page_base_addr);
+ if (page_type == HOST_REGION_PHYSICAL_MEMORY) {
+ host_pa = get_shadow_addr(info, guest_pa);
+ } else {
- shadow_region_t * ent;
-
- ent = get_shadow_region_by_addr(&(guest_info->mem_map), guest_addr);
-
- if (!ent) {
- // FIXME Panic here - guest is trying to map to physical memory
- // it does not own in any way!
- return -1;
- }
-
- switch (ent->host_type) {
- case HOST_REGION_PHYSICAL_MEMORY:
- {
- addr_t host_addr;
-
- // points into currently allocated physical memory, so we just
- // set up the shadow to point to the mapped location
- if (guest_pa_to_host_pa(guest_info, guest_addr, &host_addr)) {
- // Panic here
- return -1;
- }
-
- shadow_pte[j].page_base_addr = PAGE_ALIGNED_ADDR(host_addr);
- // FIXME set vmm_info bits here
- break;
- }
- case HOST_REGION_UNALLOCATED:
- // points to physical memory that is *allowed* but that we
- // have not yet allocated. We mark as not present and set a
- // bit to remind us to allocate it later
- shadow_pte[j].present = 0;
- // FIXME Set vminfo bits here so that we know that we will be
- // allocating it later
- break;
- case HOST_REGION_NOTHING:
- // points to physical memory that is NOT ALLOWED.
- // We will mark it as not present and set a bit to remind
- // us that it's bad later and insert a GPF then
- shadow_pte[j].present = 0;
- break;
- case HOST_REGION_MEMORY_MAPPED_DEVICE:
- case HOST_REGION_REMOTE:
- case HOST_REGION_SWAPPED:
- default:
- // Panic. Currently unhandled
- return -1;
- break;
- }
+ //
+ // Setup various memory types
+ //
}
+
+ host_pte[i].page_base_addr = PT32_BASE_ADDR(host_pa);
+ host_pte[i].present = 1;
}
}
- return 0;
+
+ return (addr_t)host_pte;
}
-
+
