X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=palacios%2Fsrc%2Fpalacios%2Fvmm_direct_paging_64.h;h=baae5d54d223b792df8f25e42b85bdfeaf574009;hb=2a9554f33cc3bdaab08d59ac54d6dd1f4472285d;hp=a840c2b94564b95a1af2a2577adf4d2f43cf7727;hpb=c255ba778677e2006f1d7ebad69a8f7005747907;p=palacios.git

diff --git a/palacios/src/palacios/vmm_direct_paging_64.h b/palacios/src/palacios/vmm_direct_paging_64.h
index a840c2b..baae5d5 100644
--- a/palacios/src/palacios/vmm_direct_paging_64.h
+++ b/palacios/src/palacios/vmm_direct_paging_64.h
@@ -27,104 +27,216 @@
 #include <palacios/vm_guest_mem.h>
 #include <palacios/vm_guest.h>
 
+// Reference: AMD Software Developer Manual Vol.2 Ch.5 "Page Translation and Protection"
+
+static inline int handle_passthrough_pagefault_64(struct guest_info * core, addr_t fault_addr, pf_error_t error_code) {
+    pml4e64_t * pml      = NULL;
+    pdpe64_t * pdpe      = NULL;
+    pde64_t * pde        = NULL;
+    pde64_2MB_t * pde2mb = NULL;
+    pte64_t * pte        = NULL;
+    addr_t host_addr     = 0;
+
+    int pml_index  = PML4E64_INDEX(fault_addr);
+    int pdpe_index = PDPE64_INDEX(fault_addr);
+    int pde_index  = PDE64_INDEX(fault_addr);
+    int pte_index  = PTE64_INDEX(fault_addr);
+
+    struct v3_mem_region * region =  v3_get_mem_region(core->vm_info, core->cpu_id, fault_addr);
+    int page_size = PAGE_SIZE_4KB;
+
+    if (region == NULL) {
+	PrintError("%s: invalid region, addr=%p\n", __FUNCTION__, (void *)fault_addr);
+	return -1;
+    }
 
-static inline int handle_passthrough_pagefault_64(struct guest_info * info, 
-						     addr_t fault_addr, 
-						     pf_error_t error_code) {
-  pml4e64_t * pml = CR3_TO_PML4E64_VA(info->ctrl_regs.cr3);
-  pdpe64_t * pdpe = NULL;
-  pde64_t * pde = NULL;
-  pte64_t * pte = NULL;
-  addr_t host_addr = 0;
-
-  int pml_index = PML4E64_INDEX(fault_addr);
-  int pdpe_index = PDPE64_INDEX(fault_addr);
-  int pde_index = PDE64_INDEX(fault_addr);
-  int pte_index = PTE64_INDEX(fault_addr);
-
-  struct v3_shadow_region * region =  v3_get_shadow_region(info, fault_addr);
-  
-  if ((region == NULL) || 
-      (region->host_type == SHDW_REGION_INVALID)) {
-    PrintError("Invalid region in passthrough page fault 64, addr=%p\n", 
-	       (void *)fault_addr);
-    return -1;
-  }
-
-  host_addr = v3_get_shadow_addr(region, fault_addr);
-
-  //Fix up the PML entry
-  if (pml[pml_index].present == 0) {
-    pdpe = (pdpe64_t *)create_generic_pt_page();
-   
-    pml[pml_index].present = 1;
-    // Set default PML Flags...
-    pml[pml_index].pdp_base_addr = PAGE_BASE_ADDR((addr_t)V3_PAddr(pdpe));    
-  } else {
-    pdpe = V3_VAddr((void*)BASE_TO_PAGE_ADDR(pml[pml_index].pdp_base_addr));
-  }
+    /*  Check if:
+     *  1. the guest is configured to use large pages and 
+     * 	2. the memory regions can be referenced by a large page
+     */
+    if ((core->use_large_pages == 1) || (core->use_giant_pages == 1)) {
+	page_size = v3_get_max_page_size(core, fault_addr, LONG);
+    }
+
+    PrintDebug("Using page size of %dKB\n", page_size / 1024);
 
-  // Fix up the PDPE entry
-  if (pdpe[pdpe_index].present == 0) {
-    pde = (pde64_t *)create_generic_pt_page();
+ 
+    // Lookup the correct PML address based on the PAGING MODE
+    if (core->shdw_pg_mode == SHADOW_PAGING) {
+	pml = CR3_TO_PML4E64_VA(core->ctrl_regs.cr3);
+    } else {
+	pml = CR3_TO_PML4E64_VA(core->direct_map_pt);
+    }
+
+    //Fix up the PML entry
+    if (pml[pml_index].present == 0) {
+	pdpe = (pdpe64_t *)create_generic_pt_page();
    
-    pdpe[pdpe_index].present = 1;
-    // Set default PDPE Flags...
-    pdpe[pdpe_index].pd_base_addr = PAGE_BASE_ADDR((addr_t)V3_PAddr(pde));    
-  } else {
-    pde = V3_VAddr((void*)BASE_TO_PAGE_ADDR(pdpe[pdpe_index].pd_base_addr));
-  }
+	// Set default PML Flags...
+	pml[pml_index].present = 1;
+        pml[pml_index].writable = 1;
+        pml[pml_index].user_page = 1;
 
+	pml[pml_index].pdp_base_addr = PAGE_BASE_ADDR_4KB((addr_t)V3_PAddr(pdpe));    
+    } else {
+	pdpe = V3_VAddr((void*)BASE_TO_PAGE_ADDR_4KB(pml[pml_index].pdp_base_addr));
+    }
 
-  // Fix up the PDE entry
-  if (pde[pde_index].present == 0) {
-    pte = (pte64_t *)create_generic_pt_page();
+    // Fix up the PDPE entry
+    if (pdpe[pdpe_index].present == 0) {
+	pde = (pde64_t *)create_generic_pt_page();
+	
+	// Set default PDPE Flags...
+	pdpe[pdpe_index].present = 1;
+	pdpe[pdpe_index].writable = 1;
+	pdpe[pdpe_index].user_page = 1;
 
-    pde[pde_index].present = 1;
-    pde[pde_index].writable = 1;
-    pde[pde_index].user_page = 1;
+	pdpe[pdpe_index].pd_base_addr = PAGE_BASE_ADDR_4KB((addr_t)V3_PAddr(pde));    
+    } else {
+	pde = V3_VAddr((void*)BASE_TO_PAGE_ADDR_4KB(pdpe[pdpe_index].pd_base_addr));
+    }
 
-    pde[pde_index].pt_base_addr = PAGE_BASE_ADDR((addr_t)V3_PAddr(pte));
-  } else {
-    pte = V3_VAddr((void*)BASE_TO_PAGE_ADDR(pde[pde_index].pt_base_addr));
-  }
+    // Fix up the 2MiB PDE and exit here
+    if (page_size == PAGE_SIZE_2MB) {
+	pde2mb = (pde64_2MB_t *)pde; // all but these two lines are the same for PTE
+	pde2mb[pde_index].large_page = 1;
+
+	if (pde2mb[pde_index].present == 0) {
+	    pde2mb[pde_index].user_page = 1;
+
+	    if ( (region->flags.alloced == 1) && 
+		 (region->flags.read == 1)) {
+		// Full access
+		pde2mb[pde_index].present = 1;
+
+		if (region->flags.write == 1) {
+		    pde2mb[pde_index].writable = 1;
+		} else {
+		    pde2mb[pde_index].writable = 0;
+		}
+
+		if (v3_gpa_to_hpa(core, fault_addr, &host_addr) == -1) {
+		    PrintError("Error Could not translate fault addr (%p)\n", (void *)fault_addr);
+		    return -1;
+		}
+
+		pde2mb[pde_index].page_base_addr = PAGE_BASE_ADDR_2MB(host_addr);
+	    } else {
+		return region->unhandled(core, fault_addr, fault_addr, region, error_code);
+	    }
+	} else {
+	    // We fix all permissions on the first pass, 
+	    // so we only get here if its an unhandled exception
+
+	    return region->unhandled(core, fault_addr, fault_addr, region, error_code);
+	}
+
+	// All done
+	return 0;
+    } 
+
+    // Continue with the 4KiB page heirarchy
+    
+    // Fix up the PDE entry
+    if (pde[pde_index].present == 0) {
+	pte = (pte64_t *)create_generic_pt_page();
+	
+	pde[pde_index].present = 1;
+	pde[pde_index].writable = 1;
+	pde[pde_index].user_page = 1;
+	
+	pde[pde_index].pt_base_addr = PAGE_BASE_ADDR_4KB((addr_t)V3_PAddr(pte));
+    } else {
+	pte = V3_VAddr((void*)BASE_TO_PAGE_ADDR_4KB(pde[pde_index].pt_base_addr));
+    }
 
+    // Fix up the PTE entry
+    if (pte[pte_index].present == 0) {
+	pte[pte_index].user_page = 1;
+	
+	if ((region->flags.alloced == 1) && 
+	    (region->flags.read == 1)) {
+	    // Full access
+	    pte[pte_index].present = 1;
+
+	    if (region->flags.write == 1) {
+		pte[pte_index].writable = 1;
+	    } else {
+		pte[pte_index].writable = 0;
+	    }
+
+    	    if (v3_gpa_to_hpa(core, fault_addr, &host_addr) == -1) {
+		PrintError("Error Could not translate fault addr (%p)\n", (void *)fault_addr);
+		return -1;
+   	    }
+
+	    pte[pte_index].page_base_addr = PAGE_BASE_ADDR_4KB(host_addr);
+	} else {
+	    return region->unhandled(core, fault_addr, fault_addr, region, error_code);
+	}
+    } else {
+	// We fix all permissions on the first pass, 
+	// so we only get here if its an unhandled exception
 
-  // Fix up the PTE entry
-  if (pte[pte_index].present == 0) {
-    pte[pte_index].user_page = 1;
+	return region->unhandled(core, fault_addr, fault_addr, region, error_code);
+    }
 
-    if (region->host_type == SHDW_REGION_ALLOCATED) {
-      // Full access
-      pte[pte_index].present = 1;
-      pte[pte_index].writable = 1;
+    return 0;
+}
 
-      pte[pte_index].page_base_addr = PAGE_BASE_ADDR(host_addr);
+static inline int invalidate_addr_64(struct guest_info * core, addr_t inv_addr) {
+    pml4e64_t * pml = NULL;
+    pdpe64_t * pdpe = NULL;
+    pde64_t * pde = NULL;
+    pte64_t * pte = NULL;
 
-    } else if (region->host_type == SHDW_REGION_WRITE_HOOK) {
-      // Only trap writes
-     pte[pte_index].present = 1; 
-     pte[pte_index].writable = 0;
 
-     pte[pte_index].page_base_addr = PAGE_BASE_ADDR(host_addr);
+    // TODO:
+    // Call INVLPGA
 
-    } else if (region->host_type == SHDW_REGION_FULL_HOOK) {
-      // trap all accesses
-      return v3_handle_mem_full_hook(info, fault_addr, fault_addr, region, error_code);
+    // clear the page table entry
+    int pml_index = PML4E64_INDEX(inv_addr);
+    int pdpe_index = PDPE64_INDEX(inv_addr);
+    int pde_index = PDE64_INDEX(inv_addr);
+    int pte_index = PTE64_INDEX(inv_addr);
 
+    
+    // Lookup the correct PDE address based on the PAGING MODE
+    if (core->shdw_pg_mode == SHADOW_PAGING) {
+	pml = CR3_TO_PML4E64_VA(core->ctrl_regs.cr3);
     } else {
-      PrintError("Unknown Region Type...\n");
-      return -1;
+	pml = CR3_TO_PML4E64_VA(core->direct_map_pt);
+    }
+
+    if (pml[pml_index].present == 0) {
+	return 0;
+    }
+
+    pdpe = V3_VAddr((void*)BASE_TO_PAGE_ADDR(pml[pml_index].pdp_base_addr));
+
+    if (pdpe[pdpe_index].present == 0) {
+	return 0;
+    } else if (pdpe[pdpe_index].large_page == 1) { // 1GiB
+	pdpe[pdpe_index].present = 0;
+	return 0;
     }
-  }
-   
-  if ( (region->host_type == SHDW_REGION_WRITE_HOOK) && 
-       (error_code.write == 1) ) {
-    return v3_handle_mem_wr_hook(info, fault_addr, fault_addr, region, error_code);
-  }
 
-  return 0;
+    pde = V3_VAddr((void*)BASE_TO_PAGE_ADDR(pdpe[pdpe_index].pd_base_addr));
+
+    if (pde[pde_index].present == 0) {
+	return 0;
+    } else if (pde[pde_index].large_page == 1) { // 2MiB
+	pde[pde_index].present = 0;
+	return 0;
+    }
+
+    pte = V3_VAddr((void*)BASE_TO_PAGE_ADDR(pde[pde_index].pt_base_addr));
+
+    pte[pte_index].present = 0; // 4KiB
+
+    return 0;
 }
 
 
+
 #endif