#include <palacios/vmm_hashtable.h>
+#include <palacios/vmm_direct_paging.h>
+
#ifndef DEBUG_SHADOW_PAGING
#undef PrintDebug
#define PrintDebug(fmt, args...)
***/
-struct guest_table {
- addr_t cr3;
- struct list_head link;
-};
-
-
-struct backptr {
- addr_t ptr;
- struct list_head link;
-};
-
-
struct shadow_page_data {
- addr_t ptr;
- addr_t guest_addr;
-
- struct list_head backptrs;
- struct list_head guest_tables;
+ v3_reg_t cr3;
+ addr_t page_pa;
+
+ struct list_head page_list_node;
};
-
-
-//DEFINE_HASHTABLE_INSERT(add_cr3_to_cache, addr_t, struct hashtable *);
-//DEFINE_HASHTABLE_SEARCH(find_cr3_in_cache, addr_t, struct hashtable *);
-//DEFINE_HASHTABLE_REMOVE(del_cr3_from_cache, addr_t, struct hashtable *, 0);
-
-
DEFINE_HASHTABLE_INSERT(add_pte_map, addr_t, addr_t);
DEFINE_HASHTABLE_SEARCH(find_pte_map, addr_t, addr_t);
//DEFINE_HASHTABLE_REMOVE(del_pte_map, addr_t, addr_t, 0);
return (key1 == key2);
}
-static addr_t create_new_shadow_pt();
+static struct shadow_page_data * create_new_shadow_pt(struct guest_info * info);
static void inject_guest_pf(struct guest_info * info, addr_t fault_addr, pf_error_t error_code);
static int is_guest_pf(pt_access_status_t guest_access, pt_access_status_t shadow_access);
state->guest_cr3 = 0;
state->guest_cr0 = 0;
+ INIT_LIST_HEAD(&(state->page_list));
+
state->cached_ptes = NULL;
state->cached_cr3 = 0;
// creates new shadow page tables
// updates the shadow CR3 register to point to the new pts
int v3_activate_shadow_pt(struct guest_info * info) {
- switch (info->cpu_mode) {
+ switch (v3_get_cpu_mode(info)) {
case PROTECTED:
return activate_shadow_pt_32(info);
case LONG_16_COMPAT:
return activate_shadow_pt_64(info);
default:
- PrintError("Invalid CPU mode: %d\n", info->cpu_mode);
+ PrintError("Invalid CPU mode: %s\n", v3_cpu_mode_to_str(v3_get_cpu_mode(info)));
return -1;
}
int v3_handle_shadow_pagefault(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) {
- if (info->mem_mode == PHYSICAL_MEM) {
+ if (v3_get_mem_mode(info) == PHYSICAL_MEM) {
// If paging is not turned on we need to handle the special cases
- return handle_special_page_fault(info, fault_addr, fault_addr, error_code);
- } else if (info->mem_mode == VIRTUAL_MEM) {
+ return v3_handle_passthrough_pagefault(info, fault_addr, error_code);
+ } else if (v3_get_mem_mode(info) == VIRTUAL_MEM) {
- switch (info->cpu_mode) {
+ switch (v3_get_cpu_mode(info)) {
case PROTECTED:
return handle_shadow_pagefault_32(info, fault_addr, error_code);
break;
case PROTECTED_PAE:
return handle_shadow_pagefault_32pae(info, fault_addr, error_code);
case LONG:
+ case LONG_32_COMPAT:
+ case LONG_16_COMPAT:
return handle_shadow_pagefault_64(info, fault_addr, error_code);
break;
default:
- PrintError("Unhandled CPU Mode\n");
+ PrintError("Unhandled CPU Mode: %s\n", v3_cpu_mode_to_str(v3_get_cpu_mode(info)));
return -1;
}
} else {
}
-
-static addr_t create_new_shadow_pt() {
- void * host_pde = 0;
-
- host_pde = V3_VAddr(V3_AllocPages(1));
- memset(host_pde, 0, PAGE_SIZE);
-
- return (addr_t)host_pde;
-}
-
-
-static void inject_guest_pf(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) {
- if (info->enable_profiler) {
- info->profiler.guest_pf_cnt++;
- }
-
- info->ctrl_regs.cr2 = fault_addr;
- v3_raise_exception_with_error(info, PF_EXCEPTION, *(uint_t *)&error_code);
-}
-
-
-static int is_guest_pf(pt_access_status_t guest_access, pt_access_status_t shadow_access) {
- /* basically the reasoning is that there can be multiple reasons for a page fault:
- If there is a permissions failure for a page present in the guest _BUT_
- the reason for the fault was that the page is not present in the shadow,
- _THEN_ we have to map the shadow page in and reexecute, this will generate
- a permissions fault which is _THEN_ valid to send to the guest
- _UNLESS_ both the guest and shadow have marked the page as not present
-
- whew...
- */
- if (guest_access != PT_ACCESS_OK) {
- // Guest Access Error
-
- if ((shadow_access != PT_ACCESS_NOT_PRESENT) &&
- (guest_access != PT_ACCESS_NOT_PRESENT)) {
- // aka (guest permission error)
- return 1;
- }
-
- if ((shadow_access == PT_ACCESS_NOT_PRESENT) &&
- (guest_access == PT_ACCESS_NOT_PRESENT)) {
- // Page tables completely blank, handle guest first
- return 1;
- }
-
- // Otherwise we'll handle the guest fault later...?
- }
-
- return 0;
-}
-
-
-
-
-
-
-
-
-
-
int v3_handle_shadow_invlpg(struct guest_info * info) {
uchar_t instr[15];
struct x86_instr dec_instr;
int ret = 0;
addr_t vaddr = 0;
- if (info->mem_mode != VIRTUAL_MEM) {
+ if (v3_get_mem_mode(info) != VIRTUAL_MEM) {
// Paging must be turned on...
// should handle with some sort of fault I think
PrintError("ERROR: INVLPG called in non paged mode\n");
return -1;
}
- if (info->mem_mode == PHYSICAL_MEM) {
+ if (v3_get_mem_mode(info) == PHYSICAL_MEM) {
ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
} else {
ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
info->rip += dec_instr.instr_length;
- switch (info->cpu_mode) {
+ switch (v3_get_cpu_mode(info)) {
case PROTECTED:
return handle_shadow_invlpg_32(info, vaddr);
case PROTECTED_PAE:
case LONG_16_COMPAT:
return handle_shadow_invlpg_64(info, vaddr);
default:
- PrintError("Invalid CPU mode: %d\n", info->cpu_mode);
+ PrintError("Invalid CPU mode: %s\n", v3_cpu_mode_to_str(v3_get_cpu_mode(info)));
return -1;
}
}
+
+
+
+static struct shadow_page_data * create_new_shadow_pt(struct guest_info * info) {
+ struct shadow_page_state * state = &(info->shdw_pg_state);
+ v3_reg_t cur_cr3 = info->ctrl_regs.cr3;
+ struct shadow_page_data * page_tail = NULL;
+ addr_t shdw_page = 0;
+
+ if (!list_empty(&(state->page_list))) {
+ page_tail = list_tail_entry(&(state->page_list), struct shadow_page_data, page_list_node);
+
+ if (page_tail->cr3 != cur_cr3) {
+ PrintDebug("Reusing old shadow Page: %p (cur_CR3=%p)(page_cr3=%p) \n",
+ (void *) page_tail->page_pa, (void *)cur_cr3, (void *)(page_tail->cr3));
+
+ list_move(&(page_tail->page_list_node), &(state->page_list));
+
+ memset(V3_VAddr((void *)(page_tail->page_pa)), 0, PAGE_SIZE_4KB);
+
+
+ return page_tail;
+ }
+ }
+
+ // else
+
+ page_tail = (struct shadow_page_data *)V3_Malloc(sizeof(struct shadow_page_data));
+ page_tail->page_pa = (addr_t)V3_AllocPages(1);
+
+ PrintDebug("Allocating new shadow Page: %p (cur_cr3=%p)\n", (void *)page_tail->page_pa, (void *)cur_cr3);
+
+ page_tail->cr3 = cur_cr3;
+ list_add(&(page_tail->page_list_node), &(state->page_list));
+
+ shdw_page = (addr_t)V3_VAddr((void *)(page_tail->page_pa));
+ memset((void *)shdw_page, 0, PAGE_SIZE_4KB);
+
+ return page_tail;
+}
+
+
+static void inject_guest_pf(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) {
+ if (info->enable_profiler) {
+ info->profiler.guest_pf_cnt++;
+ }
+
+ info->ctrl_regs.cr2 = fault_addr;
+ v3_raise_exception_with_error(info, PF_EXCEPTION, *(uint_t *)&error_code);
+}
+
+
+static int is_guest_pf(pt_access_status_t guest_access, pt_access_status_t shadow_access) {
+ /* basically the reasoning is that there can be multiple reasons for a page fault:
+ If there is a permissions failure for a page present in the guest _BUT_
+ the reason for the fault was that the page is not present in the shadow,
+ _THEN_ we have to map the shadow page in and reexecute, this will generate
+ a permissions fault which is _THEN_ valid to send to the guest
+ _UNLESS_ both the guest and shadow have marked the page as not present
+
+ whew...
+ */
+ if (guest_access != PT_ACCESS_OK) {
+ // Guest Access Error
+
+ if ((shadow_access != PT_ACCESS_NOT_PRESENT) &&
+ (guest_access != PT_ACCESS_NOT_PRESENT)) {
+ // aka (guest permission error)
+ return 1;
+ }
+
+ if ((shadow_access == PT_ACCESS_NOT_PRESENT) &&
+ (guest_access == PT_ACCESS_NOT_PRESENT)) {
+ // Page tables completely blank, handle guest first
+ return 1;
+ }
+
+ // Otherwise we'll handle the guest fault later...?
+ }
+
+ return 0;
+}
+
+
