VirtualBox

source: vbox/trunk/src/VBox/VMM/VMMAll/PGMAllShw.h@ 103583

Last change on this file since 103583 was 99748, checked in by vboxsync, 19 months ago

VMM/PGM: Nested VMX: bugref:10318 Ensure we don't modify the leaf bit via (ModifyPage).
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1/* $Id: PGMAllShw.h 99748 2023-05-11 11:22:56Z vboxsync $ */
2/** @file
3 * VBox - Page Manager, Shadow Paging Template - All context code.
4 */
5
6/*
7 * Copyright (C) 2006-2023 Oracle and/or its affiliates.
8 *
9 * This file is part of VirtualBox base platform packages, as
10 * available from https://www.virtualbox.org.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation, in version 3 of the
15 * License.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <https://www.gnu.org/licenses>.
24 *
25 * SPDX-License-Identifier: GPL-3.0-only
26 */
27
28
29/*********************************************************************************************************************************
30* Defined Constants And Macros *
31*********************************************************************************************************************************/
32#undef SHWUINT
33#undef SHWPT
34#undef PSHWPT
35#undef SHWPTE
36#undef PSHWPTE
37#undef SHWPD
38#undef PSHWPD
39#undef SHWPDE
40#undef PSHWPDE
41#undef SHW_PDE_PG_MASK
42#undef SHW_PD_SHIFT
43#undef SHW_PD_MASK
44#undef SHW_PDE_ATOMIC_SET
45#undef SHW_PDE_ATOMIC_SET2
46#undef SHW_PDE_IS_P
47#undef SHW_PDE_IS_A
48#undef SHW_PDE_IS_BIG
49#undef SHW_PTE_PG_MASK
50#undef SHW_PTE_IS_P
51#undef SHW_PTE_IS_RW
52#undef SHW_PTE_IS_US
53#undef SHW_PTE_IS_A
54#undef SHW_PTE_IS_D
55#undef SHW_PTE_IS_P_RW
56#undef SHW_PTE_IS_TRACK_DIRTY
57#undef SHW_PTE_GET_HCPHYS
58#undef SHW_PTE_GET_U
59#undef SHW_PTE_LOG64
60#undef SHW_PTE_SET
61#undef SHW_PTE_ATOMIC_SET
62#undef SHW_PTE_ATOMIC_SET2
63#undef SHW_PTE_SET_RO
64#undef SHW_PTE_SET_RW
65#undef SHW_PT_SHIFT
66#undef SHW_PT_MASK
67#undef SHW_TOTAL_PD_ENTRIES
68#undef SHW_PDPT_SHIFT
69#undef SHW_PDPT_MASK
70#undef SHW_PDPE_PG_MASK
71
72#if PGM_SHW_TYPE == PGM_TYPE_32BIT || PGM_SHW_TYPE == PGM_TYPE_NESTED_32BIT
73# define SHWUINT uint32_t
74# define SHWPT X86PT
75# define PSHWPT PX86PT
76# define SHWPTE X86PTE
77# define PSHWPTE PX86PTE
78# define SHWPD X86PD
79# define PSHWPD PX86PD
80# define SHWPDE X86PDE
81# define PSHWPDE PX86PDE
82# define SHW_PDE_PG_MASK X86_PDE_PG_MASK
83# define SHW_PD_SHIFT X86_PD_SHIFT
84# define SHW_PD_MASK X86_PD_MASK
85# define SHW_TOTAL_PD_ENTRIES X86_PG_ENTRIES
86# define SHW_PDE_IS_P(Pde) ( (Pde).u & X86_PDE_P )
87# define SHW_PDE_IS_A(Pde) ( (Pde).u & X86_PDE_A )
88# define SHW_PDE_IS_BIG(Pde) ( (Pde).u & X86_PDE_PS )
89# define SHW_PDE_ATOMIC_SET(Pde, uNew) do { ASMAtomicWriteU32(&(Pde).u, (uNew)); } while (0)
90# define SHW_PDE_ATOMIC_SET2(Pde, Pde2) do { ASMAtomicWriteU32(&(Pde).u, (Pde2).u); } while (0)
91# define SHW_PTE_PG_MASK X86_PTE_PG_MASK
92# define SHW_PTE_IS_P(Pte) ( (Pte).u & X86_PTE_P )
93# define SHW_PTE_IS_RW(Pte) ( (Pte).u & X86_PTE_RW )
94# define SHW_PTE_IS_US(Pte) ( (Pte).u & X86_PTE_US )
95# define SHW_PTE_IS_A(Pte) ( (Pte).u & X86_PTE_A )
96# define SHW_PTE_IS_D(Pte) ( (Pte).u & X86_PTE_D )
97# define SHW_PTE_IS_P_RW(Pte) ( ((Pte).u & (X86_PTE_P | X86_PTE_RW)) == (X86_PTE_P | X86_PTE_RW) )
98# define SHW_PTE_IS_TRACK_DIRTY(Pte) ( !!((Pte).u & PGM_PTFLAGS_TRACK_DIRTY) )
99# define SHW_PTE_GET_HCPHYS(Pte) ( (Pte).u & X86_PTE_PG_MASK )
100# define SHW_PTE_LOG64(Pte) ( (uint64_t)(Pte).u )
101# define SHW_PTE_GET_U(Pte) ( (Pte).u ) /**< Use with care. */
102# define SHW_PTE_SET(Pte, uNew) do { (Pte).u = (uNew); } while (0)
103# define SHW_PTE_ATOMIC_SET(Pte, uNew) do { ASMAtomicWriteU32(&(Pte).u, (uNew)); } while (0)
104# define SHW_PTE_ATOMIC_SET2(Pte, Pte2) do { ASMAtomicWriteU32(&(Pte).u, (Pte2).u); } while (0)
105# define SHW_PTE_SET_RO(Pte) do { (Pte).u &= ~(X86PGUINT)X86_PTE_RW; } while (0)
106# define SHW_PTE_SET_RW(Pte) do { (Pte).u |= X86_PTE_RW; } while (0)
107# define SHW_PT_SHIFT X86_PT_SHIFT
108# define SHW_PT_MASK X86_PT_MASK
109
110#elif PGM_SHW_TYPE == PGM_TYPE_EPT
111# define SHWUINT uint64_t
112# define SHWPT EPTPT
113# define PSHWPT PEPTPT
114# define SHWPTE EPTPTE
115# define PSHWPTE PEPTPTE
116# define SHWPD EPTPD
117# define PSHWPD PEPTPD
118# define SHWPDE EPTPDE
119# define PSHWPDE PEPTPDE
120# define SHW_PDE_PG_MASK EPT_PDE_PG_MASK
121# define SHW_PD_SHIFT EPT_PD_SHIFT
122# define SHW_PD_MASK EPT_PD_MASK
123# define SHW_PDE_IS_P(Pde) ( (Pde).u & EPT_E_READ /* always set*/ )
124# define SHW_PDE_IS_A(Pde) ( 1 ) /* We don't use EPT_E_ACCESSED, use with care! */
125# define SHW_PDE_IS_BIG(Pde) ( (Pde).u & EPT_E_LEAF )
126# define SHW_PDE_ATOMIC_SET(Pde, uNew) do { ASMAtomicWriteU64(&(Pde).u, (uNew)); } while (0)
127# define SHW_PDE_ATOMIC_SET2(Pde, Pde2) do { ASMAtomicWriteU64(&(Pde).u, (Pde2).u); } while (0)
128# define SHW_PTE_PG_MASK EPT_PTE_PG_MASK
129# define SHW_PTE_IS_P(Pte) ( (Pte).u & EPT_E_READ ) /* Approximation, works for us. */
130# define SHW_PTE_IS_RW(Pte) ( (Pte).u & EPT_E_WRITE )
131# define SHW_PTE_IS_US(Pte) ( true )
132# define SHW_PTE_IS_A(Pte) ( true )
133# define SHW_PTE_IS_D(Pte) ( true )
134# define SHW_PTE_IS_P_RW(Pte) ( ((Pte).u & (EPT_E_READ | EPT_E_WRITE)) == (EPT_E_READ | EPT_E_WRITE) )
135# define SHW_PTE_IS_TRACK_DIRTY(Pte) ( false )
136# define SHW_PTE_GET_HCPHYS(Pte) ( (Pte).u & EPT_PTE_PG_MASK )
137# define SHW_PTE_LOG64(Pte) ( (Pte).u )
138# define SHW_PTE_GET_U(Pte) ( (Pte).u ) /**< Use with care. */
139# define SHW_PTE_SET(Pte, uNew) do { (Pte).u = (uNew); } while (0)
140# define SHW_PTE_ATOMIC_SET(Pte, uNew) do { ASMAtomicWriteU64(&(Pte).u, (uNew)); } while (0)
141# define SHW_PTE_ATOMIC_SET2(Pte, Pte2) do { ASMAtomicWriteU64(&(Pte).u, (Pte2).u); } while (0)
142# define SHW_PTE_SET_RO(Pte) do { (Pte).u &= ~(uint64_t)EPT_E_WRITE; } while (0)
143# define SHW_PTE_SET_RW(Pte) do { (Pte).u |= EPT_E_WRITE; } while (0)
144# define SHW_PT_SHIFT EPT_PT_SHIFT
145# define SHW_PT_MASK EPT_PT_MASK
146# define SHW_PDPT_SHIFT EPT_PDPT_SHIFT
147# define SHW_PDPT_MASK EPT_PDPT_MASK
148# define SHW_PDPE_PG_MASK EPT_PDPE_PG_MASK
149# define SHW_TOTAL_PD_ENTRIES (EPT_PG_AMD64_ENTRIES * EPT_PG_AMD64_PDPE_ENTRIES)
150
151#else
152# define SHWUINT uint64_t
153# define SHWPT PGMSHWPTPAE
154# define PSHWPT PPGMSHWPTPAE
155# define SHWPTE PGMSHWPTEPAE
156# define PSHWPTE PPGMSHWPTEPAE
157# define SHWPD X86PDPAE
158# define PSHWPD PX86PDPAE
159# define SHWPDE X86PDEPAE
160# define PSHWPDE PX86PDEPAE
161# define SHW_PDE_PG_MASK X86_PDE_PAE_PG_MASK
162# define SHW_PD_SHIFT X86_PD_PAE_SHIFT
163# define SHW_PD_MASK X86_PD_PAE_MASK
164# define SHW_PDE_IS_P(Pde) ( (Pde).u & X86_PDE_P )
165# define SHW_PDE_IS_A(Pde) ( (Pde).u & X86_PDE_A )
166# define SHW_PDE_IS_BIG(Pde) ( (Pde).u & X86_PDE_PS )
167# define SHW_PDE_ATOMIC_SET(Pde, uNew) do { ASMAtomicWriteU64(&(Pde).u, (uNew)); } while (0)
168# define SHW_PDE_ATOMIC_SET2(Pde, Pde2) do { ASMAtomicWriteU64(&(Pde).u, (Pde2).u); } while (0)
169# define SHW_PTE_PG_MASK X86_PTE_PAE_PG_MASK
170# define SHW_PTE_IS_P(Pte) PGMSHWPTEPAE_IS_P(Pte)
171# define SHW_PTE_IS_RW(Pte) PGMSHWPTEPAE_IS_RW(Pte)
172# define SHW_PTE_IS_US(Pte) PGMSHWPTEPAE_IS_US(Pte)
173# define SHW_PTE_IS_A(Pte) PGMSHWPTEPAE_IS_A(Pte)
174# define SHW_PTE_IS_D(Pte) PGMSHWPTEPAE_IS_D(Pte)
175# define SHW_PTE_IS_P_RW(Pte) PGMSHWPTEPAE_IS_P_RW(Pte)
176# define SHW_PTE_IS_TRACK_DIRTY(Pte) PGMSHWPTEPAE_IS_TRACK_DIRTY(Pte)
177# define SHW_PTE_GET_HCPHYS(Pte) PGMSHWPTEPAE_GET_HCPHYS(Pte)
178# define SHW_PTE_LOG64(Pte) PGMSHWPTEPAE_GET_LOG(Pte)
179# define SHW_PTE_GET_U(Pte) PGMSHWPTEPAE_GET_U(Pte) /**< Use with care. */
180# define SHW_PTE_SET(Pte, uNew) PGMSHWPTEPAE_SET(Pte, uNew)
181# define SHW_PTE_ATOMIC_SET(Pte, uNew) PGMSHWPTEPAE_ATOMIC_SET(Pte, uNew)
182# define SHW_PTE_ATOMIC_SET2(Pte, Pte2) PGMSHWPTEPAE_ATOMIC_SET2(Pte, Pte2)
183# define SHW_PTE_SET_RO(Pte) PGMSHWPTEPAE_SET_RO(Pte)
184# define SHW_PTE_SET_RW(Pte) PGMSHWPTEPAE_SET_RW(Pte)
185# define SHW_PT_SHIFT X86_PT_PAE_SHIFT
186# define SHW_PT_MASK X86_PT_PAE_MASK
187
188# if PGM_SHW_TYPE == PGM_TYPE_AMD64 || PGM_SHW_TYPE == PGM_TYPE_NESTED_AMD64 || /* whatever: */ PGM_SHW_TYPE == PGM_TYPE_NONE
189# define SHW_PDPT_SHIFT X86_PDPT_SHIFT
190# define SHW_PDPT_MASK X86_PDPT_MASK_AMD64
191# define SHW_PDPE_PG_MASK X86_PDPE_PG_MASK
192# define SHW_TOTAL_PD_ENTRIES (X86_PG_AMD64_ENTRIES * X86_PG_AMD64_PDPE_ENTRIES)
193
194# elif PGM_SHW_TYPE == PGM_TYPE_PAE || PGM_SHW_TYPE == PGM_TYPE_NESTED_PAE
195# define SHW_PDPT_SHIFT X86_PDPT_SHIFT
196# define SHW_PDPT_MASK X86_PDPT_MASK_PAE
197# define SHW_PDPE_PG_MASK X86_PDPE_PG_MASK
198# define SHW_TOTAL_PD_ENTRIES (X86_PG_PAE_ENTRIES * X86_PG_PAE_PDPE_ENTRIES)
199
200# else
201# error "Misconfigured PGM_SHW_TYPE or something..."
202# endif
203#endif
204
205#if PGM_SHW_TYPE == PGM_TYPE_NONE && PGM_TYPE_IS_NESTED_OR_EPT(PGM_SHW_TYPE)
206# error "PGM_TYPE_IS_NESTED_OR_EPT is true for PGM_TYPE_NONE!"
207#endif
208
209
210
211/*********************************************************************************************************************************
212* Internal Functions *
213*********************************************************************************************************************************/
214RT_C_DECLS_BEGIN
215PGM_SHW_DECL(int, GetPage)(PVMCPUCC pVCpu, RTGCUINTPTR GCPtr, uint64_t *pfFlags, PRTHCPHYS pHCPhys);
216PGM_SHW_DECL(int, ModifyPage)(PVMCPUCC pVCpu, RTGCUINTPTR GCPtr, size_t cbPages, uint64_t fFlags, uint64_t fMask, uint32_t fOpFlags);
217PGM_SHW_DECL(int, Exit)(PVMCPUCC pVCpu);
218#ifdef IN_RING3
219PGM_SHW_DECL(int, Relocate)(PVMCPUCC pVCpu, RTGCPTR offDelta);
220#endif
221RT_C_DECLS_END
222
223
224/**
225 * Enters the shadow mode.
226 *
227 * @returns VBox status code.
228 * @param pVCpu The cross context virtual CPU structure.
229 */
230PGM_SHW_DECL(int, Enter)(PVMCPUCC pVCpu)
231{
232#if PGM_TYPE_IS_NESTED_OR_EPT(PGM_SHW_TYPE)
233
234# ifdef VBOX_WITH_NESTED_HWVIRT_VMX_EPT
235 RTGCPHYS GCPhysCR3;
236 PGMPOOLKIND enmKind;
237 if (pVCpu->pgm.s.enmGuestSlatMode != PGMSLAT_EPT)
238 {
239 GCPhysCR3 = RT_BIT_64(63);
240 enmKind = PGMPOOLKIND_ROOT_NESTED;
241 }
242 else
243 {
244 GCPhysCR3 = pVCpu->pgm.s.uEptPtr & EPT_EPTP_PG_MASK;
245 enmKind = PGMPOOLKIND_EPT_PML4_FOR_EPT_PML4;
246 }
247# else
248 RTGCPHYS const GCPhysCR3 = RT_BIT_64(63);
249 PGMPOOLKIND const enmKind = PGMPOOLKIND_ROOT_NESTED;
250# endif
251 PVMCC const pVM = pVCpu->CTX_SUFF(pVM);
252
253 Assert(HMIsNestedPagingActive(pVM));
254 Assert(pVM->pgm.s.fNestedPaging);
255 Assert(!pVCpu->pgm.s.pShwPageCR3R3);
256
257 PGM_LOCK_VOID(pVM);
258
259 PPGMPOOLPAGE pNewShwPageCR3;
260 int rc = pgmPoolAlloc(pVM, GCPhysCR3, enmKind, PGMPOOLACCESS_DONTCARE, PGM_A20_IS_ENABLED(pVCpu),
261 NIL_PGMPOOL_IDX, UINT32_MAX, true /*fLockPage*/,
262 &pNewShwPageCR3);
263 AssertLogRelRCReturnStmt(rc, PGM_UNLOCK(pVM), rc);
264
265 pVCpu->pgm.s.pShwPageCR3R3 = pgmPoolConvertPageToR3(pVM->pgm.s.CTX_SUFF(pPool), pNewShwPageCR3);
266 pVCpu->pgm.s.pShwPageCR3R0 = pgmPoolConvertPageToR0(pVM->pgm.s.CTX_SUFF(pPool), pNewShwPageCR3);
267
268 PGM_UNLOCK(pVM);
269
270 Log(("Enter nested shadow paging mode: root %RHv phys %RHp\n", pVCpu->pgm.s.pShwPageCR3R3, pVCpu->pgm.s.CTX_SUFF(pShwPageCR3)->Core.Key));
271#else
272 NOREF(pVCpu);
273#endif
274 return VINF_SUCCESS;
275}
276
277
278/**
279 * Exits the shadow mode.
280 *
281 * @returns VBox status code.
282 * @param pVCpu The cross context virtual CPU structure.
283 */
284PGM_SHW_DECL(int, Exit)(PVMCPUCC pVCpu)
285{
286#if PGM_TYPE_IS_NESTED_OR_EPT(PGM_SHW_TYPE)
287 PVMCC pVM = pVCpu->CTX_SUFF(pVM);
288 if (pVCpu->pgm.s.CTX_SUFF(pShwPageCR3))
289 {
290 PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
291
292 PGM_LOCK_VOID(pVM);
293
294# if defined(VBOX_WITH_NESTED_HWVIRT_VMX_EPT) && PGM_SHW_TYPE == PGM_TYPE_EPT
295 if (pVCpu->pgm.s.enmGuestSlatMode == PGMSLAT_EPT)
296 pgmPoolUnlockPage(pPool, pVCpu->pgm.s.CTX_SUFF(pShwPageCR3));
297# endif
298
299 /* Do *not* unlock this page as we have two of them floating around in the 32-bit host & 64-bit guest case.
300 * We currently assert when you try to free one of them; don't bother to really allow this.
301 *
302 * Note that this is two nested paging root pages max. This isn't a leak. They are reused.
303 */
304 /* pgmPoolUnlockPage(pPool, pVCpu->pgm.s.CTX_SUFF(pShwPageCR3)); */
305
306 pgmPoolFreeByPage(pPool, pVCpu->pgm.s.CTX_SUFF(pShwPageCR3), NIL_PGMPOOL_IDX, UINT32_MAX);
307 pVCpu->pgm.s.pShwPageCR3R3 = 0;
308 pVCpu->pgm.s.pShwPageCR3R0 = 0;
309
310 PGM_UNLOCK(pVM);
311
312 Log(("Leave nested shadow paging mode\n"));
313 }
314#else
315 RT_NOREF_PV(pVCpu);
316#endif
317 return VINF_SUCCESS;
318}
319
320
321#if 0
322PGM_SHW_DECL(int, NestedGetPage)(PVMCPUCC pVCpu, PEPTPD pEptPd, PPGMPTWALK pWalk, uint64_t *pfFlags, PRTHCPHYS pHCPhys)
323{
324#if PGM_SHW_TYPE == PGM_TYPE_EPT
325 RTGCPHYS const GCPhysNested = pWalk->GCPhysNested;
326 unsigned const iEptPd = ((GCPhysNested >> SHW_PD_SHIFT) & SHW_PD_MASK);
327 Assert(iEptPd < EPT_PG_ENTRIES);
328 SHWPDE EptPde = pEptPd->a[iEptPd];
329 if (!SHW_PDE_IS_P(EptPde))
330 {
331 *pfFlags = 0;
332 *pHCPhys = NIL_RTHCPHYS;
333 return VERR_PAGE_TABLE_NOT_PRESENT;
334 }
335
336 if (SHW_PDE_IS_BIG(EptPde))
337 {
338 Assert(pWalk->fBigPage);
339 if (pfFlags)
340 *pfFlags = (EptPde.u & ~SHW_PDE_PG_MASK);
341 if (pHCPhys)
342 *pHCPhys = (EptPde.u & EPT_PDE2M_PG_MASK) + (pWalk->GCPhys & (RT_BIT(EPT_PD_SHIFT) - 1) & X86_PAGE_4K_BASE_MASK);
343 return VINF_SUCCESS;
344 }
345
346 PSHWPT pEptPt;
347 int const rc = PGM_HCPHYS_2_PTR(pVCpu->CTX_SUFF(pVM), pVCpu, EptPde.u & EPT_PDE_PG_MASK, &pEptPt);
348 if (RT_FAILURE(rc))
349 {
350 *pfFlags = 0;
351 *pHCPhys = NIL_RTHCPHYS;
352 return rc;
353 }
354
355 unsigned const iEptPt = (GCPhysNested >> SHW_PT_SHIFT) & SHW_PT_MASK;
356 Assert(iEptPt < EPT_PG_ENTRIES);
357 SHWPTE EptPte = pEptPt->a[iEptPt];
358 if (!SHW_PTE_IS_P(EptPte))
359 {
360 *pfFlags = 0;
361 *pHCPhys = NIL_RTHCPHYS;
362 return VERR_PAGE_NOT_PRESENT;
363 }
364
365 if (pfFlags)
366 {
367 /* Read, Write and Execute bits (Present mask) are cumulative. */
368 *pfFlags = (SHW_PTE_GET_U(EptPte) & ~SHW_PTE_PG_MASK)
369 & ((EptPde.u & EPT_PRESENT_MASK) | ~(uint64_t)EPT_PRESENT_MASK);
370 }
371 if (pHCPhys)
372 *pHCPhys = SHW_PTE_GET_HCPHYS(EptPte);
373 return VINF_SUCCESS;
374
375#else /* PGM_SHW_TYPE != PGM_TYPE_EPT */
376 RT_NOREF(pVCpu, pEptPd, pWalk, *pfFlags, pHCPhys);
377 AssertFailed();
378 return VERR_PGM_SHW_NONE_IPE;
379#endif /* PGM_SHW_TYPE != PGM_TYPE_EPT */
380}
381#endif
382
383
384/**
385 * Gets effective page information (from the VMM page directory).
386 *
387 * @returns VBox status code.
388 * @param pVCpu The cross context virtual CPU structure.
389 * @param GCPtr Guest Context virtual address of the page.
390 * @param pfFlags Where to store the flags. These are X86_PTE_*.
391 * @param pHCPhys Where to store the HC physical address of the page.
392 * This is page aligned.
393 * @remark You should use PGMMapGetPage() for pages in a mapping.
394 */
395PGM_SHW_DECL(int, GetPage)(PVMCPUCC pVCpu, RTGCUINTPTR GCPtr, uint64_t *pfFlags, PRTHCPHYS pHCPhys)
396{
397#if PGM_SHW_TYPE == PGM_TYPE_NONE
398 RT_NOREF(pVCpu, GCPtr);
399 AssertFailed();
400 *pfFlags = 0;
401 *pHCPhys = NIL_RTHCPHYS;
402 return VERR_PGM_SHW_NONE_IPE;
403
404#else /* PGM_SHW_TYPE != PGM_TYPE_NONE */
405 PVMCC pVM = pVCpu->CTX_SUFF(pVM);
406
407 PGM_LOCK_ASSERT_OWNER(pVM);
408
409 /*
410 * Get the PDE.
411 */
412# if PGM_SHW_TYPE == PGM_TYPE_AMD64 || PGM_SHW_TYPE == PGM_TYPE_NESTED_AMD64
413 X86PDEPAE Pde;
414
415 /* PML4 */
416 X86PML4E Pml4e = pgmShwGetLongModePML4E(pVCpu, GCPtr);
417 if (!(Pml4e.u & X86_PML4E_P))
418 return VERR_PAGE_TABLE_NOT_PRESENT;
419
420 /* PDPT */
421 PX86PDPT pPDPT;
422 int rc = PGM_HCPHYS_2_PTR(pVM, pVCpu, Pml4e.u & X86_PML4E_PG_MASK, &pPDPT);
423 if (RT_FAILURE(rc))
424 return rc;
425 const unsigned iPDPT = (GCPtr >> SHW_PDPT_SHIFT) & SHW_PDPT_MASK;
426 X86PDPE Pdpe = pPDPT->a[iPDPT];
427 if (!(Pdpe.u & X86_PDPE_P))
428 return VERR_PAGE_TABLE_NOT_PRESENT;
429
430 /* PD */
431 PX86PDPAE pPd;
432 rc = PGM_HCPHYS_2_PTR(pVM, pVCpu, Pdpe.u & X86_PDPE_PG_MASK, &pPd);
433 if (RT_FAILURE(rc))
434 return rc;
435 const unsigned iPd = (GCPtr >> SHW_PD_SHIFT) & SHW_PD_MASK;
436 Pde = pPd->a[iPd];
437
438 /* Merge accessed, write, user and no-execute bits into the PDE. */
439 AssertCompile(X86_PML4E_A == X86_PDPE_A && X86_PML4E_A == X86_PDE_A);
440 AssertCompile(X86_PML4E_RW == X86_PDPE_RW && X86_PML4E_RW == X86_PDE_RW);
441 AssertCompile(X86_PML4E_US == X86_PDPE_US && X86_PML4E_US == X86_PDE_US);
442 AssertCompile(X86_PML4E_NX == X86_PDPE_LM_NX && X86_PML4E_NX == X86_PDE_PAE_NX);
443 Pde.u &= (Pml4e.u & Pdpe.u) | ~(X86PGPAEUINT)(X86_PML4E_A | X86_PML4E_RW | X86_PML4E_US);
444 Pde.u |= (Pml4e.u | Pdpe.u) & X86_PML4E_NX;
445
446# elif PGM_SHW_TYPE == PGM_TYPE_PAE || PGM_SHW_TYPE == PGM_TYPE_NESTED_PAE
447 X86PDEPAE Pde = pgmShwGetPaePDE(pVCpu, GCPtr);
448
449# elif PGM_SHW_TYPE == PGM_TYPE_EPT
450 /*
451 * We're currently ASSUMING that the SLAT mode here is always "direct".
452 * If a guest (e.g., nested Hyper-V) turns out to require this
453 * (probably while modifying shadow non-MMIO2 pages) then handle this
454 * by calling (NestedGetPage). Asserting for now.
455 */
456 Assert(pVCpu->pgm.s.enmGuestSlatMode == PGMSLAT_DIRECT);
457 PEPTPD pPDDst;
458 int rc = pgmShwGetEPTPDPtr(pVCpu, GCPtr, NULL, &pPDDst);
459 if (rc == VINF_SUCCESS) /** @todo this function isn't expected to return informational status codes. Check callers / fix. */
460 { /* likely */ }
461 else
462 {
463 AssertRC(rc);
464 return rc;
465 }
466 Assert(pPDDst);
467
468 const unsigned iPd = ((GCPtr >> SHW_PD_SHIFT) & SHW_PD_MASK);
469 EPTPDE Pde = pPDDst->a[iPd];
470
471# elif PGM_SHW_TYPE == PGM_TYPE_32BIT || PGM_SHW_TYPE == PGM_TYPE_NESTED_32BIT
472 X86PDE Pde = pgmShwGet32BitPDE(pVCpu, GCPtr);
473
474# else
475# error "Misconfigured PGM_SHW_TYPE or something..."
476# endif
477 if (!SHW_PDE_IS_P(Pde))
478 return VERR_PAGE_TABLE_NOT_PRESENT;
479
480 /* Deal with large pages. */
481 if (SHW_PDE_IS_BIG(Pde))
482 {
483 /*
484 * Store the results.
485 * RW and US flags depend on the entire page translation hierarchy - except for
486 * legacy PAE which has a simplified PDPE.
487 */
488 if (pfFlags)
489 {
490 *pfFlags = (Pde.u & ~SHW_PDE_PG_MASK);
491# if PGM_WITH_NX(PGM_SHW_TYPE, PGM_SHW_TYPE) || PGM_SHW_TYPE == PGM_TYPE_NESTED_PAE || PGM_SHW_TYPE == PGM_TYPE_NESTED_AMD64
492 if ( (Pde.u & X86_PTE_PAE_NX)
493# if PGM_WITH_NX(PGM_SHW_TYPE, PGM_SHW_TYPE)
494 && CPUMIsGuestNXEnabled(pVCpu) /** @todo why do we have to check the guest state here? */
495# endif
496 )
497 *pfFlags |= X86_PTE_PAE_NX;
498# endif
499 }
500
501 if (pHCPhys)
502 *pHCPhys = (Pde.u & SHW_PDE_PG_MASK) + (GCPtr & (RT_BIT(SHW_PD_SHIFT) - 1) & X86_PAGE_4K_BASE_MASK);
503
504 return VINF_SUCCESS;
505 }
506
507 /*
508 * Get PT entry.
509 */
510 PSHWPT pPT;
511 int rc2 = PGM_HCPHYS_2_PTR(pVM, pVCpu, Pde.u & SHW_PDE_PG_MASK, &pPT);
512 if (RT_FAILURE(rc2))
513 return rc2;
514 const unsigned iPt = (GCPtr >> SHW_PT_SHIFT) & SHW_PT_MASK;
515 SHWPTE Pte = pPT->a[iPt];
516 if (!SHW_PTE_IS_P(Pte))
517 return VERR_PAGE_NOT_PRESENT;
518
519 /*
520 * Store the results.
521 * RW and US flags depend on the entire page translation hierarchy - except for
522 * legacy PAE which has a simplified PDPE.
523 */
524 if (pfFlags)
525 {
526 *pfFlags = (SHW_PTE_GET_U(Pte) & ~SHW_PTE_PG_MASK)
527 & ((Pde.u & (X86_PTE_RW | X86_PTE_US)) | ~(uint64_t)(X86_PTE_RW | X86_PTE_US));
528
529# if PGM_WITH_NX(PGM_SHW_TYPE, PGM_SHW_TYPE) || PGM_SHW_TYPE == PGM_TYPE_NESTED_PAE || PGM_SHW_TYPE == PGM_TYPE_NESTED_AMD64
530 /* The NX bit is determined by a bitwise OR between the PT and PD */
531 if ( ((SHW_PTE_GET_U(Pte) | Pde.u) & X86_PTE_PAE_NX)
532# if PGM_WITH_NX(PGM_SHW_TYPE, PGM_SHW_TYPE)
533 && CPUMIsGuestNXEnabled(pVCpu) /** @todo why do we have to check the guest state here? */
534# endif
535 )
536 *pfFlags |= X86_PTE_PAE_NX;
537# endif
538 }
539
540 if (pHCPhys)
541 *pHCPhys = SHW_PTE_GET_HCPHYS(Pte);
542
543 return VINF_SUCCESS;
544#endif /* PGM_SHW_TYPE != PGM_TYPE_NONE */
545}
546
547
548/**
549 * Modify page flags for a range of pages in the shadow context.
550 *
551 * The existing flags are ANDed with the fMask and ORed with the fFlags.
552 *
553 * @returns VBox status code.
554 * @param pVCpu The cross context virtual CPU structure.
555 * @param GCPtr Virtual address of the first page in the range. Page aligned!
556 * @param cb Size (in bytes) of the range to apply the modification to. Page aligned!
557 * @param fFlags The OR mask - page flags X86_PTE_*, excluding the page mask of course.
558 * @param fMask The AND mask - page flags X86_PTE_*.
559 * Be extremely CAREFUL with ~'ing values because they can be 32-bit!
560 * @param fOpFlags A combination of the PGM_MK_PK_XXX flags.
561 * @remark You must use PGMMapModifyPage() for pages in a mapping.
562 */
563PGM_SHW_DECL(int, ModifyPage)(PVMCPUCC pVCpu, RTGCUINTPTR GCPtr, size_t cb, uint64_t fFlags, uint64_t fMask, uint32_t fOpFlags)
564{
565#if PGM_SHW_TYPE == PGM_TYPE_NONE
566 RT_NOREF(pVCpu, GCPtr, cb, fFlags, fMask, fOpFlags);
567 AssertFailed();
568 return VERR_PGM_SHW_NONE_IPE;
569
570#else /* PGM_SHW_TYPE != PGM_TYPE_NONE */
571 PVMCC pVM = pVCpu->CTX_SUFF(pVM);
572 PGM_LOCK_ASSERT_OWNER(pVM);
573
574 /*
575 * Walk page tables and pages till we're done.
576 */
577 int rc;
578 for (;;)
579 {
580 /*
581 * Get the PDE.
582 */
583# if PGM_SHW_TYPE == PGM_TYPE_AMD64 || PGM_SHW_TYPE == PGM_TYPE_NESTED_AMD64
584 X86PDEPAE Pde;
585 /* PML4 */
586 X86PML4E Pml4e = pgmShwGetLongModePML4E(pVCpu, GCPtr);
587 if (!(Pml4e.u & X86_PML4E_P))
588 return VERR_PAGE_TABLE_NOT_PRESENT;
589
590 /* PDPT */
591 PX86PDPT pPDPT;
592 rc = PGM_HCPHYS_2_PTR(pVM, pVCpu, Pml4e.u & X86_PML4E_PG_MASK, &pPDPT);
593 if (RT_FAILURE(rc))
594 return rc;
595 const unsigned iPDPT = (GCPtr >> SHW_PDPT_SHIFT) & SHW_PDPT_MASK;
596 X86PDPE Pdpe = pPDPT->a[iPDPT];
597 if (!(Pdpe.u & X86_PDPE_P))
598 return VERR_PAGE_TABLE_NOT_PRESENT;
599
600 /* PD */
601 PX86PDPAE pPd;
602 rc = PGM_HCPHYS_2_PTR(pVM, pVCpu, Pdpe.u & X86_PDPE_PG_MASK, &pPd);
603 if (RT_FAILURE(rc))
604 return rc;
605 const unsigned iPd = (GCPtr >> SHW_PD_SHIFT) & SHW_PD_MASK;
606 Pde = pPd->a[iPd];
607
608# elif PGM_SHW_TYPE == PGM_TYPE_PAE || PGM_SHW_TYPE == PGM_TYPE_NESTED_PAE
609 X86PDEPAE Pde = pgmShwGetPaePDE(pVCpu, GCPtr);
610
611# elif PGM_SHW_TYPE == PGM_TYPE_EPT
612 EPTPDE Pde;
613 const unsigned iPd = ((GCPtr >> SHW_PD_SHIFT) & SHW_PD_MASK);
614 if (pVCpu->pgm.s.enmGuestSlatMode == PGMSLAT_DIRECT)
615 {
616 PEPTPD pPDDst;
617 rc = pgmShwGetEPTPDPtr(pVCpu, GCPtr, NULL, &pPDDst);
618 if (rc != VINF_SUCCESS)
619 {
620 AssertRC(rc);
621 return rc;
622 }
623 Assert(pPDDst);
624 Pde = pPDDst->a[iPd];
625 }
626 else
627 {
628# ifdef VBOX_WITH_NESTED_HWVIRT_VMX_EPT
629 Assert(pVCpu->pgm.s.enmGuestSlatMode == PGMSLAT_EPT);
630 Assert(!(GCPtr & GUEST_PAGE_OFFSET_MASK));
631 PGMPTWALK Walk;
632 PGMPTWALKGST GstWalkAll;
633 RTGCPHYS const GCPhysNestedPage = GCPtr;
634 rc = pgmGstSlatWalk(pVCpu, GCPhysNestedPage, false /*fIsLinearAddrValid*/, 0 /*GCPtrNestedFault*/, &Walk,
635 &GstWalkAll);
636 if (RT_SUCCESS(rc))
637 {
638# ifdef DEBUG_ramshankar
639 /* Paranoia. */
640 Assert(GstWalkAll.enmType == PGMPTWALKGSTTYPE_EPT);
641 Assert(Walk.fSucceeded);
642 Assert(Walk.fEffective & (PGM_PTATTRS_EPT_R_MASK | PGM_PTATTRS_EPT_W_MASK | PGM_PTATTRS_EPT_X_SUPER_MASK));
643 Assert(Walk.fIsSlat);
644 Assert(RT_BOOL(Walk.fEffective & PGM_PTATTRS_R_MASK) == RT_BOOL(Walk.fEffective & PGM_PTATTRS_EPT_R_MASK));
645 Assert(RT_BOOL(Walk.fEffective & PGM_PTATTRS_W_MASK) == RT_BOOL(Walk.fEffective & PGM_PTATTRS_EPT_W_MASK));
646 Assert(RT_BOOL(Walk.fEffective & PGM_PTATTRS_NX_MASK) == !RT_BOOL(Walk.fEffective & PGM_PTATTRS_EPT_X_SUPER_MASK));
647# endif
648 PGM_A20_ASSERT_MASKED(pVCpu, Walk.GCPhys);
649 Assert(!(fFlags & X86_PTE_RW) || (Walk.fEffective & PGM_PTATTRS_W_MASK));
650
651 /* Update the nested-guest physical address with the translated guest-physical address. */
652 GCPtr = Walk.GCPhys;
653
654 /* Get the PD. */
655 PSHWPD pEptPd;
656 rc = pgmShwGetNestedEPTPDPtr(pVCpu, GCPhysNestedPage, NULL /*ppPdpt*/, &pEptPd, &GstWalkAll);
657 AssertRCReturn(rc, rc);
658 Assert(pEptPd);
659 Assert(iPd < EPT_PG_ENTRIES);
660 Pde = pEptPd->a[iPd];
661 }
662 else
663 {
664 Log(("Failed to translate nested-guest physical address %#RGp rc=%Rrc\n", GCPhysNestedPage, rc));
665 return rc;
666 }
667
668# else /* !VBOX_WITH_NESTED_HWVIRT_VMX_EPT */
669 AssertFailed();
670 return VERR_PGM_SHW_NONE_IPE;
671# endif /* !VBOX_WITH_NESTED_HWVIRT_VMX_EPT */
672 }
673
674# else /* PGM_TYPE_32BIT || PGM_SHW_TYPE == PGM_TYPE_NESTED_32BIT */
675 X86PDE Pde = pgmShwGet32BitPDE(pVCpu, GCPtr);
676# endif
677 if (!SHW_PDE_IS_P(Pde))
678 return VERR_PAGE_TABLE_NOT_PRESENT;
679
680 AssertFatalMsg(!SHW_PDE_IS_BIG(Pde), ("Pde=%#RX64\n", (uint64_t)Pde.u));
681
682 /*
683 * Map the page table.
684 */
685 PSHWPT pPT;
686 rc = PGM_HCPHYS_2_PTR(pVM, pVCpu, Pde.u & SHW_PDE_PG_MASK, &pPT);
687 if (RT_FAILURE(rc))
688 return rc;
689
690 unsigned iPTE = (GCPtr >> SHW_PT_SHIFT) & SHW_PT_MASK;
691 while (iPTE < RT_ELEMENTS(pPT->a))
692 {
693 if (SHW_PTE_IS_P(pPT->a[iPTE]))
694 {
695 SHWPTE const OrgPte = pPT->a[iPTE];
696 SHWPTE NewPte;
697
698 SHW_PTE_SET(NewPte, (SHW_PTE_GET_U(OrgPte) & (fMask | SHW_PTE_PG_MASK)) | (fFlags & ~SHW_PTE_PG_MASK));
699 if (!SHW_PTE_IS_P(NewPte))
700 {
701 /** @todo Some CSAM code path might end up here and upset
702 * the page pool. */
703 AssertMsgFailed(("NewPte=%#RX64 OrgPte=%#RX64 GCPtr=%#RGv\n", SHW_PTE_LOG64(NewPte), SHW_PTE_LOG64(OrgPte), GCPtr));
704 }
705 else if ( SHW_PTE_IS_RW(NewPte)
706 && !SHW_PTE_IS_RW(OrgPte)
707 && !(fOpFlags & PGM_MK_PG_IS_MMIO2) )
708 {
709 /** @todo Optimize \#PF handling by caching data. We can
710 * then use this when PGM_MK_PG_IS_WRITE_FAULT is
711 * set instead of resolving the guest physical
712 * address yet again. */
713 PGMPTWALK GstWalk;
714 rc = PGMGstGetPage(pVCpu, GCPtr, &GstWalk);
715 AssertRC(rc);
716 if (RT_SUCCESS(rc))
717 {
718 Assert((GstWalk.fEffective & X86_PTE_RW) || !(CPUMGetGuestCR0(pVCpu) & X86_CR0_WP /* allow netware hack */));
719 PPGMPAGE pPage = pgmPhysGetPage(pVM, GstWalk.GCPhys);
720 Assert(pPage);
721 if (pPage)
722 {
723 rc = pgmPhysPageMakeWritable(pVM, pPage, GstWalk.GCPhys);
724 AssertRCReturn(rc, rc);
725 Log(("%s: pgmPhysPageMakeWritable on %RGv / %RGp %R[pgmpage]\n", __PRETTY_FUNCTION__, GCPtr, GstWalk.GCPhys, pPage));
726 }
727 }
728 }
729
730 SHW_PTE_ATOMIC_SET2(pPT->a[iPTE], NewPte);
731 Assert((SHW_PTE_GET_U(NewPte) & EPT_E_LEAF) == (SHW_PTE_GET_U(OrgPte) & EPT_E_LEAF));
732
733# if PGM_SHW_TYPE == PGM_TYPE_EPT
734 HMInvalidatePhysPage(pVM, (RTGCPHYS)GCPtr);
735# else
736 PGM_INVL_PG_ALL_VCPU(pVM, GCPtr);
737# endif
738 }
739
740 /* next page */
741 cb -= HOST_PAGE_SIZE;
742 if (!cb)
743 return VINF_SUCCESS;
744 GCPtr += HOST_PAGE_SIZE;
745 iPTE++;
746 }
747 }
748#endif /* PGM_SHW_TYPE != PGM_TYPE_NONE */
749}
750
751
752#ifdef IN_RING3
753/**
754 * Relocate any GC pointers related to shadow mode paging.
755 *
756 * @returns VBox status code.
757 * @param pVCpu The cross context virtual CPU structure.
758 * @param offDelta The relocation offset.
759 */
760PGM_SHW_DECL(int, Relocate)(PVMCPUCC pVCpu, RTGCPTR offDelta)
761{
762 RT_NOREF(pVCpu, offDelta);
763 return VINF_SUCCESS;
764}
765#endif
766
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