#include <palacios/vmm_direct_paging.h>
-// set this to 1 if you want us to attempt to
-// fetch multiple entries on a page fault
-#define SPECULATIVE_PAGING 1
-#define REGULAR_PAGE_FAULT 0
-#define SPECULATIVE_PAGE_FAULT 1
-#ifndef DEBUG_SHADOW_PAGING
+#ifdef V3_CONFIG_SHADOW_PAGING_TELEMETRY
+#include <palacios/vmm_telemetry.h>
+#endif
+
+#ifdef V3_CONFIG_SYMBIOTIC_SWAP
+#include <palacios/vmm_sym_swap.h>
+#endif
+
+#ifndef V3_CONFIG_DEBUG_SHADOW_PAGING
#undef PrintDebug
#define PrintDebug(fmt, args...)
#endif
-/***
- *** There be dragons
- ***/
+static const char default_strategy[] = "VTLB";
-struct shadow_page_data {
- v3_reg_t cr3;
- addr_t page_pa;
-
- struct list_head page_list_node;
-};
+static struct hashtable * master_shdw_pg_table = NULL;
+
+static uint_t shdw_pg_hash_fn(addr_t key) {
+ char * name = (char *)key;
+ return v3_hash_buffer((uint8_t *)name, strlen(name));
+}
+
+static int shdw_pg_eq_fn(addr_t key1, addr_t key2) {
+ char * name1 = (char *)key1;
+ char * name2 = (char *)key2;
+
+ return (strcmp(name1, name2) == 0);
+}
+
+
+int V3_init_shdw_paging() {
+ extern struct v3_shdw_pg_impl * __start__v3_shdw_pg_impls[];
+ extern struct v3_shdw_pg_impl * __stop__v3_shdw_pg_impls[];
+ struct v3_shdw_pg_impl ** tmp_impl = __start__v3_shdw_pg_impls;
+ int i = 0;
+ master_shdw_pg_table = v3_create_htable(0, shdw_pg_hash_fn, shdw_pg_eq_fn);
-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);
+ while (tmp_impl != __stop__v3_shdw_pg_impls) {
+ V3_Print("Registering Shadow Paging Impl (%s)\n", (*tmp_impl)->name);
+
+ if (v3_htable_search(master_shdw_pg_table, (addr_t)((*tmp_impl)->name))) {
+ PrintError("Multiple instances of shadow paging impl (%s)\n", (*tmp_impl)->name);
+ return -1;
+ }
+
+ if (v3_htable_insert(master_shdw_pg_table,
+ (addr_t)((*tmp_impl)->name),
+ (addr_t)(*tmp_impl)) == 0) {
+ PrintError("Could not register shadow paging impl (%s)\n", (*tmp_impl)->name);
+ return -1;
+ }
+ tmp_impl = &(__start__v3_shdw_pg_impls[++i]);
+ }
-static uint_t pte_hash_fn(addr_t key) {
- return hash_long(key, 32);
+ return 0;
}
-static int pte_equals(addr_t key1, addr_t key2) {
- return (key1 == key2);
+int V3_deinit_shdw_paging() {
+ v3_free_htable(master_shdw_pg_table, 0, 0);
+ return 0;
}
-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);
-#include "vmm_shadow_paging_32.h"
-#include "vmm_shadow_paging_32pae.h"
-#include "vmm_shadow_paging_64.h"
+/***
+ *** There be dragons
+ ***/
+
+
+#ifdef V3_CONFIG_SHADOW_PAGING_TELEMETRY
+static void telemetry_cb(struct v3_vm_info * vm, void * private_data, char * hdr) {
+ int i = 0;
+ for (i = 0; i < vm->num_cores; i++) {
+ struct guest_info * core = &(vm->cores[i]);
+
+ V3_Print("%s Guest Page faults: %d\n", hdr, core->shdw_pg_state.guest_faults);
+ }
+}
+#endif
-int v3_init_shadow_page_state(struct guest_info * info) {
- struct shadow_page_state * state = &(info->shdw_pg_state);
+int v3_init_shdw_pg_state(struct guest_info * core) {
+ struct v3_shdw_pg_state * state = &(core->shdw_pg_state);
+ struct v3_shdw_pg_impl * impl = core->vm_info->shdw_impl.current_impl;
+
state->guest_cr3 = 0;
state->guest_cr0 = 0;
+ state->guest_efer.value = 0x0LL;
- INIT_LIST_HEAD(&(state->page_list));
- state->cached_ptes = NULL;
- state->cached_cr3 = 0;
+ if (impl->local_init(core) == -1) {
+ PrintError("Error in Shadow paging local initialization (%s)\n", impl->name);
+ return -1;
+ }
+
+
+#ifdef V3_CONFIG_SHADOW_PAGING_TELEMETRY
+ v3_add_telemetry_cb(core->vm_info, telemetry_cb, NULL);
+#endif
return 0;
}
+int v3_deinit_shdw_pg_state(struct guest_info * core) {
+ struct v3_shdw_pg_impl * impl = core->vm_info->shdw_impl.current_impl;
-// Reads the guest CR3 register
-// 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 (v3_get_cpu_mode(info)) {
-
- case PROTECTED:
- return activate_shadow_pt_32(info);
- case PROTECTED_PAE:
- return activate_shadow_pt_32pae(info);
- case LONG:
- case LONG_32_COMPAT:
- case LONG_16_COMPAT:
- return activate_shadow_pt_64(info);
- default:
- PrintError("Invalid CPU mode: %s\n", v3_cpu_mode_to_str(v3_get_cpu_mode(info)));
- return -1;
+ if (impl->local_deinit(core) == -1) {
+ PrintError("Error deinitializing shadow paging state\n");
+ return -1;
}
+#ifdef V3_CONFIG_SHADOW_PAGING_TELEMETRY
+ v3_remove_telemetry_cb(core->vm_info, telemetry_cb, NULL);
+#endif
+
return 0;
}
-int v3_activate_passthrough_pt(struct guest_info * info) {
- // For now... But we need to change this....
- // As soon as shadow paging becomes active the passthrough tables are hosed
- // So this will cause chaos if it is called at that time
- info->ctrl_regs.cr3 = *(addr_t*)&(info->direct_map_pt);
- //PrintError("Activate Passthrough Page tables not implemented\n");
+int v3_init_shdw_impl(struct v3_vm_info * vm) {
+ struct v3_shdw_impl_state * impl_state = &(vm->shdw_impl);
+ v3_cfg_tree_t * pg_cfg = v3_cfg_subtree(vm->cfg_data->cfg, "paging");
+ char * pg_mode = v3_cfg_val(pg_cfg, "mode");
+ char * pg_strat = v3_cfg_val(pg_cfg, "strategy");
+ struct v3_shdw_pg_impl * impl = NULL;
+
+ PrintDebug("Checking if shadow paging requested.\n");
+ if ((pg_mode != NULL) && (strcasecmp(pg_mode, "nested") == 0)) {
+ PrintDebug("Nested paging specified - not initializing shadow paging.\n");
+ return 0;
+ }
+
+ if (pg_strat == NULL) {
+ pg_strat = (char *)default_strategy;
+ }
+
+ V3_Print("Initialization of Shadow Paging implementation\n");
+
+ impl = (struct v3_shdw_pg_impl *)v3_htable_search(master_shdw_pg_table, (addr_t)pg_strat);
+
+ if (impl == NULL) {
+ PrintError("Could not find shadow paging impl (%s)\n", pg_strat);
+ return -1;
+ }
+
+ impl_state->current_impl = impl;
+
+ if (impl->init(vm, pg_cfg) == -1) {
+ PrintError("Could not initialize Shadow paging implemenation (%s)\n", impl->name);
+ return -1;
+ }
+
return 0;
}
+int v3_deinit_shdw_impl(struct v3_vm_info * vm) {
+ struct v3_shdw_pg_impl * impl = vm->shdw_impl.current_impl;
+
+ if (impl->deinit(vm) == -1) {
+ PrintError("Error deinitializing shadow paging implementation\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+
+// Reads the guest CR3 register
+// creates new shadow page tables
+// updates the shadow CR3 register to point to the new pts
+int v3_activate_shadow_pt(struct guest_info * core) {
+ struct v3_shdw_impl_state * state = &(core->vm_info->shdw_impl);
+ struct v3_shdw_pg_impl * impl = state->current_impl;
+ return impl->activate_shdw_pt(core);
+}
+
-int v3_handle_shadow_pagefault(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) {
- int rc;
+// This must flush any caches
+// and reset the cr3 value to the correct value
+int v3_invalidate_shadow_pts(struct guest_info * core) {
+ struct v3_shdw_impl_state * state = &(core->vm_info->shdw_impl);
+ struct v3_shdw_pg_impl * impl = state->current_impl;
+ return impl->invalidate_shdw_pt(core);
+}
+
+
+int v3_handle_shadow_pagefault(struct guest_info * core, addr_t fault_addr, pf_error_t error_code) {
- if (v3_get_mem_mode(info) == PHYSICAL_MEM) {
+ if (v3_get_vm_mem_mode(core) == PHYSICAL_MEM) {
// If paging is not turned on we need to handle the special cases
- return v3_handle_passthrough_pagefault(info, fault_addr, error_code);
- } else if (v3_get_mem_mode(info) == VIRTUAL_MEM) {
-
- 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: {
- addr_t curr_addr;
- addr_t fault_addr_base;
- // first, we will handle the actual fault, non-speculatively
- rc=handle_shadow_pagefault_64(info, fault_addr, error_code, REGULAR_PAGE_FAULT);
- if (rc) {
- return -1;
- }
- if (!SPECULATIVE_PAGING) {
- return 0;
- }
- fault_addr_base=PAGE_ADDR_4KB(fault_addr);
- PrintDebug("Attempting speculative paging around %p\n",(void*)fault_addr_base);
- for (curr_addr = (fault_addr_base & (~0x1fffffLL)) ;
- curr_addr < (fault_addr_base | (0x1fffffLL)) ;
- curr_addr+=PAGE_SIZE) {
- if (curr_addr!=fault_addr_base) {
- rc=handle_shadow_pagefault_64(info, curr_addr, error_code, SPECULATIVE_PAGE_FAULT);
- if (rc) {
- PrintDebug("Speculative page fault handler failed at %p\n",(void*)curr_addr);
- return -1;
- }
- }
- }
- return 0;
- }
- break;
- default:
- PrintError("Unhandled CPU Mode: %s\n", v3_cpu_mode_to_str(v3_get_cpu_mode(info)));
- return -1;
- }
+ return v3_handle_passthrough_pagefault(core, fault_addr, error_code);
+ } else if (v3_get_vm_mem_mode(core) == VIRTUAL_MEM) {
+ struct v3_shdw_impl_state * state = &(core->vm_info->shdw_impl);
+ struct v3_shdw_pg_impl * impl = state->current_impl;
+
+ return impl->handle_pagefault(core, fault_addr, error_code);
} else {
PrintError("Invalid Memory mode\n");
return -1;
}
-int v3_handle_shadow_invlpg(struct guest_info * info) {
+int v3_handle_shadow_invlpg(struct guest_info * core) {
uchar_t instr[15];
struct x86_instr dec_instr;
int ret = 0;
addr_t vaddr = 0;
- if (v3_get_mem_mode(info) != VIRTUAL_MEM) {
+ if (v3_get_vm_mem_mode(core) != 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 (v3_get_mem_mode(info) == PHYSICAL_MEM) {
- ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
+ if (v3_get_vm_mem_mode(core) == PHYSICAL_MEM) {
+ ret = v3_read_gpa_memory(core, get_addr_linear(core, core->rip, &(core->segments.cs)), 15, instr);
} else {
- ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
+ ret = v3_read_gva_memory(core, get_addr_linear(core, core->rip, &(core->segments.cs)), 15, instr);
}
if (ret == -1) {
return -1;
}
- if (v3_decode(info, (addr_t)instr, &dec_instr) == -1) {
+ if (v3_decode(core, (addr_t)instr, &dec_instr) == -1) {
PrintError("Decoding Error\n");
return -1;
}
vaddr = dec_instr.dst_operand.operand;
- info->rip += dec_instr.instr_length;
-
- switch (v3_get_cpu_mode(info)) {
- case PROTECTED:
- return handle_shadow_invlpg_32(info, vaddr);
- case PROTECTED_PAE:
- return handle_shadow_invlpg_32pae(info, vaddr);
- case LONG:
- case LONG_32_COMPAT:
- case LONG_16_COMPAT:
- return handle_shadow_invlpg_64(info, vaddr);
- default:
- 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;
+ core->rip += dec_instr.instr_length;
- 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 *)(addr_t)page_tail->page_pa,
- (void *)(addr_t)cur_cr3,
- (void *)(addr_t)(page_tail->cr3));
+ {
+ struct v3_shdw_impl_state * state = &(core->vm_info->shdw_impl);
+ struct v3_shdw_pg_impl * impl = state->current_impl;
- 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;
- }
+ return impl->handle_invlpg(core, vaddr);
}
+}
- // 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 *)(addr_t)page_tail->page_pa,
- (void *)(addr_t)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;
-}
+int v3_inject_guest_pf(struct guest_info * core, addr_t fault_addr, pf_error_t error_code) {
+ core->ctrl_regs.cr2 = fault_addr;
+#ifdef V3_CONFIG_SHADOW_PAGING_TELEMETRY
+ core->shdw_pg_state.guest_faults++;
+#endif
-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);
+ return v3_raise_exception_with_error(core, PF_EXCEPTION, *(uint_t *)&error_code);
}
-static int is_guest_pf(pt_access_status_t guest_access, pt_access_status_t shadow_access) {
+int v3_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,
return 1;
}
- if ((shadow_access == PT_ACCESS_NOT_PRESENT) &&
- (guest_access == PT_ACCESS_NOT_PRESENT)) {
+ /*
+ if ((shadow_access == PT_ACCESS_NOT_PRESENT) &&
+ (guest_access == PT_ACCESS_NOT_PRESENT)) {
+ // Page tables completely blank, handle guest first
+ return 1;
+ }
+ */
+
+ if (guest_access == PT_ACCESS_NOT_PRESENT) {
// Page tables completely blank, handle guest first
return 1;
}
-
+
// Otherwise we'll handle the guest fault later...?
}
