5 #include <geekos/ktypes.h>
9 #include <geekos/vmm_mem.h>
10 #include <geekos/vmm_util.h>
14 In the following, when we say "page table", we mean the whole 2 or 4 layer
15 page table (PDEs, PTEs), etc.
18 guest-visible paging state
19 This is the state that the guest thinks the machine is using
21 - guest physical memory
22 The physical memory addresses the guest is allowed to use
23 (see shadow page maps, below)
25 (we care about when the current one changes)
26 - guest paging registers (these are never written to hardware)
32 This the state that the machine will actually use when the guest
33 is running. It consists of:
34 - current shadow page table
35 This is the page table actually useed when the guest is running.
36 It is changed/regenerated when the guest page table changes
37 It mostly reflects the guest page table, except that it restricts
38 physical addresses to those the VMM allocates to the guest.
40 This is a mapping from guest physical memory addresses to
41 the current location of the guest physical memory content.
42 It maps from regions of physical memory addresses to regions
43 located in physical memory or elsewhere.
44 (8192,16384) -> MEM(8912,...)
45 (0,8191) -> DISK(65536,..)
46 - guest paging registers (these are written to guest state)
51 This is the state we expect to be operative when the VMM is running.
52 Typically, this is set up by the host os into which we have embedded
53 the VMM, but we include the description here for clarity.
55 This is the page table we use when we are executing in
56 the VMM (or the host os)
62 The reason why the shadow paging state and the host paging state are
63 distinct is to permit the guest to use any virtual address it wants,
64 irrespective of the addresses the VMM or the host os use. These guest
65 virtual addresses are reflected in the shadow paging state. When we
66 exit from the guest, we switch to the host paging state so that any
67 virtual addresses that overlap between the guest and VMM/host now map
68 to the physical addresses epxected by the VMM/host. On AMD SVM, this
69 switch is done by the hardware. On Intel VT, the switch is done
70 by the hardware as well, but we are responsible for manually updating
71 the host state in the vmcs before entering the guest.
79 #define MAX_PTE32_ENTRIES 1024
80 #define MAX_PDE32_ENTRIES 1024
82 #define MAX_PTE64_ENTRIES 512
83 #define MAX_PDE64_ENTRIES 512
84 #define MAX_PDPE64_ENTRIES 512
85 #define MAX_PML4E64_ENTRIES 512
87 #define PDE32_INDEX(x) ((((uint_t)x) >> 22) & 0x3ff)
88 #define PTE32_INDEX(x) ((((uint_t)x) >> 12) & 0x3ff)
91 #define PAGE_ALIGNED_ADDR(x) (((uint_t) (x)) >> 12)
94 #define PAGE_ADDR(x) (PAGE_ALIGNED_ADDR(x) << 12)
96 #define PAGE_OFFSET(x) ((((uint_t)x) & 0xfff))
100 #define CR3_TO_PDE32(cr3) (((ulong_t)cr3) & 0xfffff000)
101 #define CR3_TO_PDPTRE(cr3) (((ulong_t)cr3) & 0xffffffe0)
102 #define CR3_TO_PML4E64(cr3) (((ullong_t)cr3) & 0x000ffffffffff000)
111 /* PDE 32 bit PAGE STRUCTURES */
112 typedef enum {NOT_PRESENT, PTE32, LARGE_PAGE} pde32_entry_type_t;
114 typedef struct pde32 {
119 uint_t large_pages : 1;
120 uint_t global_page : 1;
122 uint_t pt_base_addr : 20;
125 typedef struct pte32 {
131 uint_t global_page : 1;
133 uint_t page_base_addr : 20;
137 /* 32 bit PAE PAGE STRUCTURES */
146 /* LONG MODE 64 bit PAGE STRUCTURES */
147 typedef struct pml4e64 {
157 uint_t pdp_base_addr_lo : 20;
158 uint_t pdp_base_addr_hi : 20;
159 uint_t available : 11;
160 uint_t no_execute : 1;
164 typedef struct pdpe64 {
172 uint_t large_pages : 1;
175 uint_t pd_base_addr_lo : 20;
176 uint_t pd_base_addr_hi : 20;
177 uint_t available : 11;
178 uint_t no_execute : 1;
184 typedef struct pde64 {
189 uint_t large_pages : 1;
190 uint_t reserved2 : 1;
192 uint_t pt_base_addr_lo : 20;
193 uint_t pt_base_addr_hi : 20;
194 uint_t available : 11;
195 uint_t no_execute : 1;
198 typedef struct pte64 {
204 uint_t global_page : 1;
206 uint_t page_base_addr_lo : 20;
207 uint_t page_base_addr_hi : 20;
208 uint_t available : 11;
209 uint_t no_execute : 1;
212 /* *************** */
215 typedef enum { PDE32 } paging_mode_t;
220 void delete_page_tables_pde32(pde32_t * pde);
223 pde32_entry_type_t pde32_lookup(pde32_t * pde, addr_t addr, addr_t * entry);
224 int pte32_lookup(pte32_t * pte, addr_t addr, addr_t * entry);
230 pde32_t * create_passthrough_pde32_pts(struct guest_info * guest_info);
237 void PrintDebugPageTables(pde32_t * pde);