memobj-r0drv-linux.c@ 104986

Last change on this file since 104986 was 104986, checked in by vboxsync, 5 months ago
iprt: Linux: Add initial support for RHEL 9.5 kernel, bugref:10381, bugref:10482.
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1	/* $Id: memobj-r0drv-linux.c 104986 2024-06-20 14:47:07Z vboxsync $ */
2	/** @file
3	* IPRT - Ring-0 Memory Objects, Linux.
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	* The contents of this file may alternatively be used under the terms
26	* of the Common Development and Distribution License Version 1.0
27	* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28	* in the VirtualBox distribution, in which case the provisions of the
29	* CDDL are applicable instead of those of the GPL.
30	*
31	* You may elect to license modified versions of this file under the
32	* terms and conditions of either the GPL or the CDDL or both.
33	*
34	* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35	*/
36
37
38	/*********************************************************************************************************************************
39	* Header Files *
40	*********************************************************************************************************************************/
41	#include "the-linux-kernel.h"
42
43	#include <iprt/memobj.h>
44	#include <iprt/assert.h>
45	#include <iprt/err.h>
46	#include <iprt/log.h>
47	#include <iprt/mem.h>
48	#include <iprt/process.h>
49	#include <iprt/string.h>
50	#include "internal/memobj.h"
51	#include "internal/iprt.h"
52
53
54	/*********************************************************************************************************************************
55	* Defined Constants And Macros *
56	*********************************************************************************************************************************/
57	/* early 2.6 kernels */
58	#ifndef PAGE_SHARED_EXEC
59	# define PAGE_SHARED_EXEC PAGE_SHARED
60	#endif
61	#ifndef PAGE_READONLY_EXEC
62	# define PAGE_READONLY_EXEC PAGE_READONLY
63	#endif
64
65	/** @def IPRT_USE_ALLOC_VM_AREA_FOR_EXEC
66	* Whether we use alloc_vm_area (3.2+) for executable memory.
67	* This is a must for 5.8+, but we enable it all the way back to 3.2.x for
68	* better W^R compliance (fExecutable flag). */
69	#if RTLNX_VER_RANGE(3,2,0, 5,10,0) \|\| defined(DOXYGEN_RUNNING)
70	# define IPRT_USE_ALLOC_VM_AREA_FOR_EXEC
71	#endif
72	/** @def IPRT_USE_APPLY_TO_PAGE_RANGE_FOR_EXEC
73	* alloc_vm_area was removed with 5.10 so we have to resort to a different way
74	* to allocate executable memory.
75	* It would be possible to remove IPRT_USE_ALLOC_VM_AREA_FOR_EXEC and use
76	* this path execlusively for 3.2+ but no time to test it really works on every
77	* supported kernel, so better play safe for now.
78	*/
79	#if RTLNX_VER_MIN(5,10,0) \|\| defined(DOXYGEN_RUNNING)
80	# define IPRT_USE_APPLY_TO_PAGE_RANGE_FOR_EXEC
81	#endif
82
83	/*
84	* 2.6.29+ kernels don't work with remap_pfn_range() anymore because
85	* track_pfn_vma_new() is apparently not defined for non-RAM pages.
86	* It should be safe to use vm_insert_page() older kernels as well.
87	*/
88	#if RTLNX_VER_MIN(2,6,23)
89	# define VBOX_USE_INSERT_PAGE
90	#endif
91	#if defined(CONFIG_X86_PAE) \
92	&& ( defined(HAVE_26_STYLE_REMAP_PAGE_RANGE) \
93	\|\| RTLNX_VER_RANGE(2,6,0, 2,6,11) )
94	# define VBOX_USE_PAE_HACK
95	#endif
96
97	/* gfp_t was introduced in 2.6.14, define it for earlier. */
98	#if RTLNX_VER_MAX(2,6,14)
99	# define gfp_t unsigned
100	#endif
101
102	/*
103	* Wrappers around mmap_lock/mmap_sem difference.
104	*/
105	#if RTLNX_VER_MIN(5,8,0)
106	# define LNX_MM_DOWN_READ(a_pMm) down_read(&(a_pMm)->mmap_lock)
107	# define LNX_MM_UP_READ(a_pMm) up_read(&(a_pMm)->mmap_lock)
108	# define LNX_MM_DOWN_WRITE(a_pMm) down_write(&(a_pMm)->mmap_lock)
109	# define LNX_MM_UP_WRITE(a_pMm) up_write(&(a_pMm)->mmap_lock)
110	#else
111	# define LNX_MM_DOWN_READ(a_pMm) down_read(&(a_pMm)->mmap_sem)
112	# define LNX_MM_UP_READ(a_pMm) up_read(&(a_pMm)->mmap_sem)
113	# define LNX_MM_DOWN_WRITE(a_pMm) down_write(&(a_pMm)->mmap_sem)
114	# define LNX_MM_UP_WRITE(a_pMm) up_write(&(a_pMm)->mmap_sem)
115	#endif
116
117
118	/*********************************************************************************************************************************
119	* Structures and Typedefs *
120	*********************************************************************************************************************************/
121	/**
122	* The Linux version of the memory object structure.
123	*/
124	typedef struct RTR0MEMOBJLNX
125	{
126	/** The core structure. */
127	RTR0MEMOBJINTERNAL Core;
128	/** Set if the allocation is contiguous.
129	* This means it has to be given back as one chunk. */
130	bool fContiguous;
131	/** Set if executable allocation. */
132	bool fExecutable;
133	/** Set if we've vmap'ed the memory into ring-0. */
134	bool fMappedToRing0;
135	/** This is non-zero if large page allocation. */
136	uint8_t cLargePageOrder;
137	#ifdef IPRT_USE_ALLOC_VM_AREA_FOR_EXEC
138	/** Return from alloc_vm_area() that we now need to use for executable
139	* memory. */
140	struct vm_struct *pArea;
141	/** PTE array that goes along with pArea (must be freed). */
142	pte_t **papPtesForArea;
143	#endif
144	/** The pages in the apPages array. */
145	size_t cPages;
146	/** Array of struct page pointers. (variable size) */
147	RT_FLEXIBLE_ARRAY_EXTENSION
148	struct page *apPages[RT_FLEXIBLE_ARRAY];
149	} RTR0MEMOBJLNX;
150	/** Pointer to the linux memory object. */
151	typedef RTR0MEMOBJLNX *PRTR0MEMOBJLNX;
152
153
154	/*********************************************************************************************************************************
155	* Global Variables *
156	*********************************************************************************************************************************/
157	/*
158	* Linux allows only a coarse selection of zones for
159	* allocations matching a particular maximum physical address.
160	*
161	* Sorted from high to low physical address!
162	*/
163	static const struct
164	{
165	RTHCPHYS PhysHighest;
166	gfp_t fGfp;
167	} g_aZones[] =
168	{
169	{ NIL_RTHCPHYS, GFP_KERNEL },
170	#if (defined(RT_ARCH_AMD64) \|\| defined(CONFIG_X86_PAE)) && defined(GFP_DMA32)
171	{ _4G - 1, GFP_DMA32 }, /* ZONE_DMA32: 0-4GB */
172	#elif defined(RT_ARCH_ARM32) \|\| defined(RT_ARCH_ARM64)
173	{ _4G - 1, GFP_DMA }, /* ZONE_DMA: 0-4GB */
174	#endif
175	#if defined(RT_ARCH_AMD64)
176	{ _16M - 1, GFP_DMA }, /* ZONE_DMA: 0-16MB */
177	#elif defined(RT_ARCH_X86)
178	{ 896 * _1M - 1, GFP_USER }, /* ZONE_NORMAL (32-bit hosts): 0-896MB */
179	#endif
180	};
181
182
183	static void rtR0MemObjLinuxFreePages(PRTR0MEMOBJLNX pMemLnx);
184
185
186	/**
187	* Helper that converts from a RTR0PROCESS handle to a linux task.
188	*
189	* @returns The corresponding Linux task.
190	* @param R0Process IPRT ring-0 process handle.
191	*/
192	static struct task_struct *rtR0ProcessToLinuxTask(RTR0PROCESS R0Process)
193	{
194	/** @todo fix rtR0ProcessToLinuxTask!! */
195	/** @todo many (all?) callers currently assume that we return 'current'! */
196	return R0Process == RTR0ProcHandleSelf() ? current : NULL;
197	}
198
199
200	/**
201	* Compute order. Some functions allocate 2^order pages.
202	*
203	* @returns order.
204	* @param cPages Number of pages.
205	*/
206	static int rtR0MemObjLinuxOrder(size_t cPages)
207	{
208	int iOrder;
209	size_t cTmp;
210
211	for (iOrder = 0, cTmp = cPages; cTmp >>= 1; ++iOrder)
212	;
213	if (cPages & ~((size_t)1 << iOrder))
214	++iOrder;
215
216	return iOrder;
217	}
218
219
220	/**
221	* Converts from RTMEM_PROT_* to Linux PAGE_*.
222	*
223	* @returns Linux page protection constant.
224	* @param fProt The IPRT protection mask.
225	* @param fKernel Whether it applies to kernel or user space.
226	*/
227	static pgprot_t rtR0MemObjLinuxConvertProt(unsigned fProt, bool fKernel)
228	{
229	switch (fProt)
230	{
231	default:
232	AssertMsgFailed(("%#x %d\n", fProt, fKernel)); RT_FALL_THRU();
233	case RTMEM_PROT_NONE:
234	return PAGE_NONE;
235
236	case RTMEM_PROT_READ:
237	return fKernel ? PAGE_KERNEL_RO : PAGE_READONLY;
238
239	case RTMEM_PROT_WRITE:
240	case RTMEM_PROT_WRITE \| RTMEM_PROT_READ:
241	return fKernel ? PAGE_KERNEL : PAGE_SHARED;
242
243	case RTMEM_PROT_EXEC:
244	case RTMEM_PROT_EXEC \| RTMEM_PROT_READ:
245	#if defined(RT_ARCH_X86) \|\| defined(RT_ARCH_AMD64)
246	if (fKernel)
247	{
248	# if RTLNX_VER_MIN(6,6,0) \|\| RTLNX_SUSE_MAJ_PREREQ(15, 6)
249	/* In kernel 6.6 mk_pte() macro was fortified with additional
250	* check which does not allow to use our custom mask anymore
251	* (see kernel commit ae1f05a617dcbc0a732fbeba0893786cd009536c).
252	* For this particular mapping case, an existing mask PAGE_KERNEL_ROX
253	* can be used instead. PAGE_KERNEL_ROX was introduced in
254	* kernel 5.8, however, lets apply it for kernels 6.6 and newer
255	* to be on a safe side.
256	*/
257	return PAGE_KERNEL_ROX;
258	# else
259	pgprot_t fPg = MY_PAGE_KERNEL_EXEC;
260	pgprot_val(fPg) &= ~_PAGE_RW;
261	return fPg;
262	# endif
263	}
264	return PAGE_READONLY_EXEC;
265	#else
266	return fKernel ? MY_PAGE_KERNEL_EXEC : PAGE_READONLY_EXEC;
267	#endif
268
269	case RTMEM_PROT_WRITE \| RTMEM_PROT_EXEC:
270	case RTMEM_PROT_WRITE \| RTMEM_PROT_EXEC \| RTMEM_PROT_READ:
271	return fKernel ? MY_PAGE_KERNEL_EXEC : PAGE_SHARED_EXEC;
272	}
273	}
274
275
276	/**
277	* Worker for rtR0MemObjNativeReserveUser and rtR0MemObjNativerMapUser that creates
278	* an empty user space mapping.
279	*
280	* We acquire the mmap_sem/mmap_lock of the task!
281	*
282	* @returns Pointer to the mapping.
283	* (void *)-1 on failure.
284	* @param R3PtrFixed (RTR3PTR)-1 if anywhere, otherwise a specific location.
285	* @param cb The size of the mapping.
286	* @param uAlignment The alignment of the mapping.
287	* @param pTask The Linux task to create this mapping in.
288	* @param fProt The RTMEM_PROT_* mask.
289	*/
290	static void rtR0MemObjLinuxDoMmap(RTR3PTR R3PtrFixed, size_t cb, size_t uAlignment, struct task_struct pTask, unsigned fProt)
291	{
292	unsigned fLnxProt;
293	unsigned long ulAddr;
294
295	Assert(pTask == current); /* do_mmap */
296	RT_NOREF_PV(pTask);
297
298	/*
299	* Convert from IPRT protection to mman.h PROT_ and call do_mmap.
300	*/
301	fProt &= (RTMEM_PROT_NONE \| RTMEM_PROT_READ \| RTMEM_PROT_WRITE \| RTMEM_PROT_EXEC);
302	if (fProt == RTMEM_PROT_NONE)
303	fLnxProt = PROT_NONE;
304	else
305	{
306	fLnxProt = 0;
307	if (fProt & RTMEM_PROT_READ)
308	fLnxProt \|= PROT_READ;
309	if (fProt & RTMEM_PROT_WRITE)
310	fLnxProt \|= PROT_WRITE;
311	if (fProt & RTMEM_PROT_EXEC)
312	fLnxProt \|= PROT_EXEC;
313	}
314
315	if (R3PtrFixed != (RTR3PTR)-1)
316	{
317	#if RTLNX_VER_MIN(3,5,0)
318	ulAddr = vm_mmap(NULL, R3PtrFixed, cb, fLnxProt, MAP_SHARED \| MAP_ANONYMOUS \| MAP_FIXED, 0);
319	#else
320	LNX_MM_DOWN_WRITE(pTask->mm);
321	ulAddr = do_mmap(NULL, R3PtrFixed, cb, fLnxProt, MAP_SHARED \| MAP_ANONYMOUS \| MAP_FIXED, 0);
322	LNX_MM_UP_WRITE(pTask->mm);
323	#endif
324	}
325	else
326	{
327	#if RTLNX_VER_MIN(3,5,0)
328	ulAddr = vm_mmap(NULL, 0, cb, fLnxProt, MAP_SHARED \| MAP_ANONYMOUS, 0);
329	#else
330	LNX_MM_DOWN_WRITE(pTask->mm);
331	ulAddr = do_mmap(NULL, 0, cb, fLnxProt, MAP_SHARED \| MAP_ANONYMOUS, 0);
332	LNX_MM_UP_WRITE(pTask->mm);
333	#endif
334	if ( !(ulAddr & ~PAGE_MASK)
335	&& (ulAddr & (uAlignment - 1)))
336	{
337	/** @todo implement uAlignment properly... We'll probably need to make some dummy mappings to fill
338	* up alignment gaps. This is of course complicated by fragmentation (which we might have cause
339	* ourselves) and further by there begin two mmap strategies (top / bottom). */
340	/* For now, just ignore uAlignment requirements... */
341	}
342	}
343
344
345	if (ulAddr & ~PAGE_MASK) /* ~PAGE_MASK == PAGE_OFFSET_MASK */
346	return (void *)-1;
347	return (void *)ulAddr;
348	}
349
350
351	/**
352	* Worker that destroys a user space mapping.
353	* Undoes what rtR0MemObjLinuxDoMmap did.
354	*
355	* We acquire the mmap_sem/mmap_lock of the task!
356	*
357	* @param pv The ring-3 mapping.
358	* @param cb The size of the mapping.
359	* @param pTask The Linux task to destroy this mapping in.
360	*/
361	static void rtR0MemObjLinuxDoMunmap(void pv, size_t cb, struct task_struct pTask)
362	{
363	#if RTLNX_VER_MIN(3,5,0)
364	Assert(pTask == current); RT_NOREF_PV(pTask);
365	vm_munmap((unsigned long)pv, cb);
366	#elif defined(USE_RHEL4_MUNMAP)
367	LNX_MM_DOWN_WRITE(pTask->mm);
368	do_munmap(pTask->mm, (unsigned long)pv, cb, 0); /* should it be 1 or 0? */
369	LNX_MM_UP_WRITE(pTask->mm);
370	#else
371	LNX_MM_DOWN_WRITE(pTask->mm);
372	do_munmap(pTask->mm, (unsigned long)pv, cb);
373	LNX_MM_UP_WRITE(pTask->mm);
374	#endif
375	}
376
377
378	/**
379	* Internal worker that allocates physical pages and creates the memory object for them.
380	*
381	* @returns IPRT status code.
382	* @param ppMemLnx Where to store the memory object pointer.
383	* @param enmType The object type.
384	* @param cb The number of bytes to allocate.
385	* @param uAlignment The alignment of the physical memory.
386	* Only valid if fContiguous == true, ignored otherwise.
387	* @param fFlagsLnx The page allocation flags (GPFs).
388	* @param fContiguous Whether the allocation must be contiguous.
389	* @param fExecutable Whether the memory must be executable.
390	* @param rcNoMem What to return when we're out of pages.
391	* @param pszTag Allocation tag used for statistics and such.
392	*/
393	static int rtR0MemObjLinuxAllocPages(PRTR0MEMOBJLNX *ppMemLnx, RTR0MEMOBJTYPE enmType, size_t cb,
394	size_t uAlignment, gfp_t fFlagsLnx, bool fContiguous, bool fExecutable, int rcNoMem,
395	const char *pszTag)
396	{
397	size_t iPage;
398	size_t const cPages = cb >> PAGE_SHIFT;
399	struct page *paPages;
400
401	/*
402	* Allocate a memory object structure that's large enough to contain
403	* the page pointer array.
404	*/
405	PRTR0MEMOBJLNX pMemLnx = (PRTR0MEMOBJLNX)rtR0MemObjNew(RT_UOFFSETOF_DYN(RTR0MEMOBJLNX, apPages[cPages]), enmType,
406	NULL, cb, pszTag);
407	if (!pMemLnx)
408	return VERR_NO_MEMORY;
409	pMemLnx->Core.fFlags \|= RTR0MEMOBJ_FLAGS_UNINITIALIZED_AT_ALLOC;
410	pMemLnx->cPages = cPages;
411
412	if (cPages > 255)
413	{
414	# ifdef __GFP_REPEAT
415	/* Try hard to allocate the memory, but the allocation attempt might fail. */
416	fFlagsLnx \|= __GFP_REPEAT;
417	# endif
418	# ifdef __GFP_NOMEMALLOC
419	/* Introduced with Linux 2.6.12: Don't use emergency reserves */
420	fFlagsLnx \|= __GFP_NOMEMALLOC;
421	# endif
422	}
423
424	/*
425	* Allocate the pages.
426	* For small allocations we'll try contiguous first and then fall back on page by page.
427	*/
428	#if RTLNX_VER_MIN(2,4,22)
429	if ( fContiguous
430	\|\| cb <= PAGE_SIZE * 2)
431	{
432	# ifdef VBOX_USE_INSERT_PAGE
433	paPages = alloc_pages(fFlagsLnx \| __GFP_COMP \| __GFP_NOWARN, rtR0MemObjLinuxOrder(cPages));
434	# else
435	paPages = alloc_pages(fFlagsLnx \| __GFP_NOWARN, rtR0MemObjLinuxOrder(cPages));
436	# endif
437	if (paPages)
438	{
439	fContiguous = true;
440	for (iPage = 0; iPage < cPages; iPage++)
441	pMemLnx->apPages[iPage] = &paPages[iPage];
442	}
443	else if (fContiguous)
444	{
445	rtR0MemObjDelete(&pMemLnx->Core);
446	return rcNoMem;
447	}
448	}
449
450	if (!fContiguous)
451	{
452	/** @todo Try use alloc_pages_bulk_array when available, it should be faster
453	* than a alloc_page loop. Put it in #ifdefs similar to
454	* IPRT_USE_APPLY_TO_PAGE_RANGE_FOR_EXEC. */
455	for (iPage = 0; iPage < cPages; iPage++)
456	{
457	pMemLnx->apPages[iPage] = alloc_page(fFlagsLnx \| __GFP_NOWARN);
458	if (RT_UNLIKELY(!pMemLnx->apPages[iPage]))
459	{
460	while (iPage-- > 0)
461	__free_page(pMemLnx->apPages[iPage]);
462	rtR0MemObjDelete(&pMemLnx->Core);
463	return rcNoMem;
464	}
465	}
466	}
467
468	#else /* < 2.4.22 */
469	/** @todo figure out why we didn't allocate page-by-page on 2.4.21 and older... */
470	paPages = alloc_pages(fFlagsLnx, rtR0MemObjLinuxOrder(cPages));
471	if (!paPages)
472	{
473	rtR0MemObjDelete(&pMemLnx->Core);
474	return rcNoMem;
475	}
476	for (iPage = 0; iPage < cPages; iPage++)
477	{
478	pMemLnx->apPages[iPage] = &paPages[iPage];
479	if (fExecutable)
480	MY_SET_PAGES_EXEC(pMemLnx->apPages[iPage], 1);
481	if (PageHighMem(pMemLnx->apPages[iPage]))
482	BUG();
483	}
484
485	fContiguous = true;
486	#endif /* < 2.4.22 */
487	pMemLnx->fContiguous = fContiguous;
488	pMemLnx->fExecutable = fExecutable;
489
490	#if RTLNX_VER_MAX(4,5,0)
491	/*
492	* Reserve the pages.
493	*
494	* Linux >= 4.5 with CONFIG_DEBUG_VM panics when setting PG_reserved on compound
495	* pages. According to Michal Hocko this shouldn't be necessary anyway because
496	* as pages which are not on the LRU list are never evictable.
497	*/
498	for (iPage = 0; iPage < cPages; iPage++)
499	SetPageReserved(pMemLnx->apPages[iPage]);
500	#endif
501
502	/*
503	* Note that the physical address of memory allocated with alloc_pages(flags, order)
504	* is always 2^(PAGE_SHIFT+order)-aligned.
505	*/
506	if ( fContiguous
507	&& uAlignment > PAGE_SIZE)
508	{
509	/*
510	* Check for alignment constraints. The physical address of memory allocated with
511	* alloc_pages(flags, order) is always 2^(PAGE_SHIFT+order)-aligned.
512	*/
513	if (RT_UNLIKELY(page_to_phys(pMemLnx->apPages[0]) & (uAlignment - 1)))
514	{
515	/*
516	* This should never happen!
517	*/
518	printk("rtR0MemObjLinuxAllocPages(cb=0x%lx, uAlignment=0x%lx): alloc_pages(..., %d) returned physical memory at 0x%lx!\n",
519	(unsigned long)cb, (unsigned long)uAlignment, rtR0MemObjLinuxOrder(cPages), (unsigned long)page_to_phys(pMemLnx->apPages[0]));
520	rtR0MemObjLinuxFreePages(pMemLnx);
521	return rcNoMem;
522	}
523	}
524
525	*ppMemLnx = pMemLnx;
526	return VINF_SUCCESS;
527	}
528
529
530	/**
531	* Frees the physical pages allocated by the rtR0MemObjLinuxAllocPages() call.
532	*
533	* This method does NOT free the object.
534	*
535	* @param pMemLnx The object which physical pages should be freed.
536	*/
537	static void rtR0MemObjLinuxFreePages(PRTR0MEMOBJLNX pMemLnx)
538	{
539	size_t iPage = pMemLnx->cPages;
540	if (iPage > 0)
541	{
542	/*
543	* Restore the page flags.
544	*/
545	while (iPage-- > 0)
546	{
547	#if RTLNX_VER_MAX(4,5,0)
548	/* See SetPageReserved() in rtR0MemObjLinuxAllocPages() */
549	ClearPageReserved(pMemLnx->apPages[iPage]);
550	#endif
551	#if RTLNX_VER_MAX(2,4,22)
552	if (pMemLnx->fExecutable)
553	MY_SET_PAGES_NOEXEC(pMemLnx->apPages[iPage], 1);
554	#endif
555	}
556
557	/*
558	* Free the pages.
559	*/
560	#if RTLNX_VER_MIN(2,4,22)
561	if (!pMemLnx->fContiguous)
562	{
563	iPage = pMemLnx->cPages;
564	while (iPage-- > 0)
565	__free_page(pMemLnx->apPages[iPage]);
566	}
567	else
568	#endif
569	__free_pages(pMemLnx->apPages[0], rtR0MemObjLinuxOrder(pMemLnx->cPages));
570
571	pMemLnx->cPages = 0;
572	}
573	}
574
575
576	#ifdef IPRT_USE_APPLY_TO_PAGE_RANGE_FOR_EXEC
577	/**
578	* User data passed to the apply_to_page_range() callback.
579	*/
580	typedef struct LNXAPPLYPGRANGE
581	{
582	/** Pointer to the memory object. */
583	PRTR0MEMOBJLNX pMemLnx;
584	/** The page protection flags to apply. */
585	pgprot_t fPg;
586	} LNXAPPLYPGRANGE;
587	/** Pointer to the user data. */
588	typedef LNXAPPLYPGRANGE *PLNXAPPLYPGRANGE;
589	/** Pointer to the const user data. */
590	typedef const LNXAPPLYPGRANGE *PCLNXAPPLYPGRANGE;
591
592	/**
593	* Callback called in apply_to_page_range().
594	*
595	* @returns Linux status code.
596	* @param pPte Pointer to the page table entry for the given address.
597	* @param uAddr The address to apply the new protection to.
598	* @param pvUser The opaque user data.
599	*/
600	static int rtR0MemObjLinuxApplyPageRange(pte_t pPte, unsigned long uAddr, void pvUser)
601	{
602	PCLNXAPPLYPGRANGE pArgs = (PCLNXAPPLYPGRANGE)pvUser;
603	PRTR0MEMOBJLNX pMemLnx = pArgs->pMemLnx;
604	size_t idxPg = (uAddr - (unsigned long)pMemLnx->Core.pv) >> PAGE_SHIFT;
605
606	set_pte(pPte, mk_pte(pMemLnx->apPages[idxPg], pArgs->fPg));
607	return 0;
608	}
609	#endif
610
611
612	/**
613	* Maps the allocation into ring-0.
614	*
615	* This will update the RTR0MEMOBJLNX::Core.pv and RTR0MEMOBJ::fMappedToRing0 members.
616	*
617	* Contiguous mappings that isn't in 'high' memory will already be mapped into kernel
618	* space, so we'll use that mapping if possible. If execute access is required, we'll
619	* play safe and do our own mapping.
620	*
621	* @returns IPRT status code.
622	* @param pMemLnx The linux memory object to map.
623	* @param fExecutable Whether execute access is required.
624	*/
625	static int rtR0MemObjLinuxVMap(PRTR0MEMOBJLNX pMemLnx, bool fExecutable)
626	{
627	int rc = VINF_SUCCESS;
628
629	/*
630	* Choose mapping strategy.
631	*/
632	bool fMustMap = fExecutable
633	\|\| !pMemLnx->fContiguous;
634	if (!fMustMap)
635	{
636	size_t iPage = pMemLnx->cPages;
637	while (iPage-- > 0)
638	if (PageHighMem(pMemLnx->apPages[iPage]))
639	{
640	fMustMap = true;
641	break;
642	}
643	}
644
645	Assert(!pMemLnx->Core.pv);
646	Assert(!pMemLnx->fMappedToRing0);
647
648	if (fMustMap)
649	{
650	/*
651	* Use vmap - 2.4.22 and later.
652	*/
653	#if RTLNX_VER_MIN(2,4,22) && (defined(RT_ARCH_AMD64) \|\| defined(RT_ARCH_X86))
654	pgprot_t fPg;
655	pgprot_val(fPg) = _PAGE_PRESENT \| _PAGE_RW;
656	# ifdef _PAGE_NX
657	if (!fExecutable)
658	pgprot_val(fPg) \|= _PAGE_NX;
659	# endif
660
661	# ifdef IPRT_USE_ALLOC_VM_AREA_FOR_EXEC
662	if (fExecutable)
663	{
664	# if RTLNX_VER_MIN(3,2,51)
665	pte_t papPtes = (pte_t )kmalloc_array(pMemLnx->cPages, sizeof(papPtes[0]), GFP_KERNEL);
666	# else
667	pte_t papPtes = (pte_t )kmalloc(pMemLnx->cPages * sizeof(papPtes[0]), GFP_KERNEL);
668	# endif
669	if (papPtes)
670	{
671	pMemLnx->pArea = alloc_vm_area(pMemLnx->Core.cb, papPtes); /* Note! pArea->nr_pages is not set. */
672	if (pMemLnx->pArea)
673	{
674	size_t i;
675	Assert(pMemLnx->pArea->size >= pMemLnx->Core.cb); /* Note! includes guard page. */
676	Assert(pMemLnx->pArea->addr);
677	# ifdef _PAGE_NX
678	pgprot_val(fPg) \|= _PAGE_NX; /* Uses RTR0MemObjProtect to clear NX when memory ready, W^X fashion. */
679	# endif
680	pMemLnx->papPtesForArea = papPtes;
681	for (i = 0; i < pMemLnx->cPages; i++)
682	*papPtes[i] = mk_pte(pMemLnx->apPages[i], fPg);
683	pMemLnx->Core.pv = pMemLnx->pArea->addr;
684	pMemLnx->fMappedToRing0 = true;
685	}
686	else
687	{
688	kfree(papPtes);
689	rc = VERR_MAP_FAILED;
690	}
691	}
692	else
693	rc = VERR_MAP_FAILED;
694	}
695	else
696	# endif
697	{
698	# if defined(IPRT_USE_APPLY_TO_PAGE_RANGE_FOR_EXEC)
699	if (fExecutable)
700	pgprot_val(fPg) \|= _PAGE_NX; /* Uses RTR0MemObjProtect to clear NX when memory ready, W^X fashion. */
701	# endif
702
703	# ifdef VM_MAP
704	pMemLnx->Core.pv = vmap(&pMemLnx->apPages[0], pMemLnx->cPages, VM_MAP, fPg);
705	# else
706	pMemLnx->Core.pv = vmap(&pMemLnx->apPages[0], pMemLnx->cPages, VM_ALLOC, fPg);
707	# endif
708	if (pMemLnx->Core.pv)
709	pMemLnx->fMappedToRing0 = true;
710	else
711	rc = VERR_MAP_FAILED;
712	}
713	#else /* < 2.4.22 */
714	rc = VERR_NOT_SUPPORTED;
715	#endif
716	}
717	else
718	{
719	/*
720	* Use the kernel RAM mapping.
721	*/
722	pMemLnx->Core.pv = phys_to_virt(page_to_phys(pMemLnx->apPages[0]));
723	Assert(pMemLnx->Core.pv);
724	}
725
726	return rc;
727	}
728
729
730	/**
731	* Undoes what rtR0MemObjLinuxVMap() did.
732	*
733	* @param pMemLnx The linux memory object.
734	*/
735	static void rtR0MemObjLinuxVUnmap(PRTR0MEMOBJLNX pMemLnx)
736	{
737	#if RTLNX_VER_MIN(2,4,22)
738	# ifdef IPRT_USE_ALLOC_VM_AREA_FOR_EXEC
739	if (pMemLnx->pArea)
740	{
741	# if 0
742	pte_t **papPtes = pMemLnx->papPtesForArea;
743	size_t i;
744	for (i = 0; i < pMemLnx->cPages; i++)
745	*papPtes[i] = 0;
746	# endif
747	free_vm_area(pMemLnx->pArea);
748	kfree(pMemLnx->papPtesForArea);
749	pMemLnx->pArea = NULL;
750	pMemLnx->papPtesForArea = NULL;
751	}
752	else
753	# endif
754	if (pMemLnx->fMappedToRing0)
755	{
756	Assert(pMemLnx->Core.pv);
757	vunmap(pMemLnx->Core.pv);
758	pMemLnx->fMappedToRing0 = false;
759	}
760	#else /* < 2.4.22 */
761	Assert(!pMemLnx->fMappedToRing0);
762	#endif
763	pMemLnx->Core.pv = NULL;
764	}
765
766
767	DECLHIDDEN(int) rtR0MemObjNativeFree(RTR0MEMOBJ pMem)
768	{
769	IPRT_LINUX_SAVE_EFL_AC();
770	PRTR0MEMOBJLNX pMemLnx = (PRTR0MEMOBJLNX)pMem;
771
772	/*
773	* Release any memory that we've allocated or locked.
774	*/
775	switch (pMemLnx->Core.enmType)
776	{
777	case RTR0MEMOBJTYPE_PAGE:
778	case RTR0MEMOBJTYPE_LOW:
779	case RTR0MEMOBJTYPE_CONT:
780	case RTR0MEMOBJTYPE_PHYS:
781	case RTR0MEMOBJTYPE_PHYS_NC:
782	rtR0MemObjLinuxVUnmap(pMemLnx);
783	rtR0MemObjLinuxFreePages(pMemLnx);
784	break;
785
786	case RTR0MEMOBJTYPE_LARGE_PAGE:
787	{
788	uint32_t const cLargePages = pMemLnx->Core.cb >> (pMemLnx->cLargePageOrder + PAGE_SHIFT);
789	uint32_t iLargePage;
790	for (iLargePage = 0; iLargePage < cLargePages; iLargePage++)
791	__free_pages(pMemLnx->apPages[iLargePage << pMemLnx->cLargePageOrder], pMemLnx->cLargePageOrder);
792	pMemLnx->cPages = 0;
793
794	#ifdef IPRT_USE_ALLOC_VM_AREA_FOR_EXEC
795	Assert(!pMemLnx->pArea);
796	Assert(!pMemLnx->papPtesForArea);
797	#endif
798	break;
799	}
800
801	case RTR0MEMOBJTYPE_LOCK:
802	if (pMemLnx->Core.u.Lock.R0Process != NIL_RTR0PROCESS)
803	{
804	struct task_struct *pTask = rtR0ProcessToLinuxTask(pMemLnx->Core.u.Lock.R0Process);
805	size_t iPage;
806	Assert(pTask);
807	if (pTask && pTask->mm)
808	LNX_MM_DOWN_READ(pTask->mm);
809
810	iPage = pMemLnx->cPages;
811	while (iPage-- > 0)
812	{
813	if (!PageReserved(pMemLnx->apPages[iPage]))
814	SetPageDirty(pMemLnx->apPages[iPage]);
815	#if RTLNX_VER_MIN(4,6,0)
816	put_page(pMemLnx->apPages[iPage]);
817	#else
818	page_cache_release(pMemLnx->apPages[iPage]);
819	#endif
820	}
821
822	if (pTask && pTask->mm)
823	LNX_MM_UP_READ(pTask->mm);
824	}
825	/* else: kernel memory - nothing to do here. */
826	break;
827
828	case RTR0MEMOBJTYPE_RES_VIRT:
829	Assert(pMemLnx->Core.pv);
830	if (pMemLnx->Core.u.ResVirt.R0Process != NIL_RTR0PROCESS)
831	{
832	struct task_struct *pTask = rtR0ProcessToLinuxTask(pMemLnx->Core.u.Lock.R0Process);
833	Assert(pTask);
834	if (pTask && pTask->mm)
835	rtR0MemObjLinuxDoMunmap(pMemLnx->Core.pv, pMemLnx->Core.cb, pTask);
836	}
837	else
838	{
839	vunmap(pMemLnx->Core.pv);
840
841	Assert(pMemLnx->cPages == 1 && pMemLnx->apPages[0] != NULL);
842	__free_page(pMemLnx->apPages[0]);
843	pMemLnx->apPages[0] = NULL;
844	pMemLnx->cPages = 0;
845	}
846	pMemLnx->Core.pv = NULL;
847	break;
848
849	case RTR0MEMOBJTYPE_MAPPING:
850	Assert(pMemLnx->cPages == 0); Assert(pMemLnx->Core.pv);
851	if (pMemLnx->Core.u.ResVirt.R0Process != NIL_RTR0PROCESS)
852	{
853	struct task_struct *pTask = rtR0ProcessToLinuxTask(pMemLnx->Core.u.Lock.R0Process);
854	Assert(pTask);
855	if (pTask && pTask->mm)
856	rtR0MemObjLinuxDoMunmap(pMemLnx->Core.pv, pMemLnx->Core.cb, pTask);
857	}
858	else
859	vunmap(pMemLnx->Core.pv);
860	pMemLnx->Core.pv = NULL;
861	break;
862
863	default:
864	AssertMsgFailed(("enmType=%d\n", pMemLnx->Core.enmType));
865	return VERR_INTERNAL_ERROR;
866	}
867	IPRT_LINUX_RESTORE_EFL_ONLY_AC();
868	return VINF_SUCCESS;
869	}
870
871
872	DECLHIDDEN(int) rtR0MemObjNativeAllocPage(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, bool fExecutable, const char *pszTag)
873	{
874	IPRT_LINUX_SAVE_EFL_AC();
875	PRTR0MEMOBJLNX pMemLnx;
876	int rc;
877
878	#if RTLNX_VER_MIN(2,4,22)
879	rc = rtR0MemObjLinuxAllocPages(&pMemLnx, RTR0MEMOBJTYPE_PAGE, cb, PAGE_SIZE, GFP_HIGHUSER,
880	false /* non-contiguous */, fExecutable, VERR_NO_MEMORY, pszTag);
881	#else
882	rc = rtR0MemObjLinuxAllocPages(&pMemLnx, RTR0MEMOBJTYPE_PAGE, cb, PAGE_SIZE, GFP_USER,
883	false /* non-contiguous */, fExecutable, VERR_NO_MEMORY, pszTag);
884	#endif
885	if (RT_SUCCESS(rc))
886	{
887	rc = rtR0MemObjLinuxVMap(pMemLnx, fExecutable);
888	if (RT_SUCCESS(rc))
889	{
890	*ppMem = &pMemLnx->Core;
891	IPRT_LINUX_RESTORE_EFL_AC();
892	return rc;
893	}
894
895	rtR0MemObjLinuxFreePages(pMemLnx);
896	rtR0MemObjDelete(&pMemLnx->Core);
897	}
898
899	IPRT_LINUX_RESTORE_EFL_AC();
900	return rc;
901	}
902
903
904	DECLHIDDEN(int) rtR0MemObjNativeAllocLarge(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, size_t cbLargePage, uint32_t fFlags,
905	const char *pszTag)
906	{
907	#ifdef GFP_TRANSHUGE
908	/*
909	* Allocate a memory object structure that's large enough to contain
910	* the page pointer array.
911	*/
912	# ifdef __GFP_MOVABLE
913	unsigned const fGfp = (GFP_TRANSHUGE \| __GFP_ZERO) & ~__GFP_MOVABLE;
914	# else
915	unsigned const fGfp = (GFP_TRANSHUGE \| __GFP_ZERO);
916	# endif
917	size_t const cPagesPerLarge = cbLargePage >> PAGE_SHIFT;
918	unsigned const cLargePageOrder = rtR0MemObjLinuxOrder(cPagesPerLarge);
919	size_t const cLargePages = cb >> (cLargePageOrder + PAGE_SHIFT);
920	size_t const cPages = cb >> PAGE_SHIFT;
921	PRTR0MEMOBJLNX pMemLnx;
922
923	Assert(RT_BIT_64(cLargePageOrder + PAGE_SHIFT) == cbLargePage);
924	pMemLnx = (PRTR0MEMOBJLNX)rtR0MemObjNew(RT_UOFFSETOF_DYN(RTR0MEMOBJLNX, apPages[cPages]),
925	RTR0MEMOBJTYPE_LARGE_PAGE, NULL, cb, pszTag);
926	if (pMemLnx)
927	{
928	size_t iLargePage;
929
930	pMemLnx->Core.fFlags \|= RTR0MEMOBJ_FLAGS_ZERO_AT_ALLOC;
931	pMemLnx->cLargePageOrder = cLargePageOrder;
932	pMemLnx->cPages = cPages;
933
934	/*
935	* Allocate the requested number of large pages.
936	*/
937	for (iLargePage = 0; iLargePage < cLargePages; iLargePage++)
938	{
939	struct page *paPages = alloc_pages(fGfp, cLargePageOrder);
940	if (paPages)
941	{
942	size_t const iPageBase = iLargePage << cLargePageOrder;
943	size_t iPage = cPagesPerLarge;
944	while (iPage-- > 0)
945	pMemLnx->apPages[iPageBase + iPage] = &paPages[iPage];
946	}
947	else
948	{
949	/*Log(("rtR0MemObjNativeAllocLarge: cb=%#zx cPages=%#zx cLargePages=%#zx cLargePageOrder=%u cPagesPerLarge=%#zx iLargePage=%#zx -> failed!\n",
950	cb, cPages, cLargePages, cLargePageOrder, cPagesPerLarge, iLargePage, paPages));*/
951	while (iLargePage-- > 0)
952	__free_pages(pMemLnx->apPages[iLargePage << (cLargePageOrder - PAGE_SHIFT)], cLargePageOrder);
953	rtR0MemObjDelete(&pMemLnx->Core);
954	return VERR_NO_MEMORY;
955	}
956	}
957	*ppMem = &pMemLnx->Core;
958	return VINF_SUCCESS;
959	}
960	return VERR_NO_MEMORY;
961
962	#else
963	/*
964	* We don't call rtR0MemObjFallbackAllocLarge here as it can be a really
965	* bad idea to trigger the swap daemon and whatnot. So, just fail.
966	*/
967	RT_NOREF(ppMem, cb, cbLargePage, fFlags, pszTag);
968	return VERR_NOT_SUPPORTED;
969	#endif
970	}
971
972
973	DECLHIDDEN(int) rtR0MemObjNativeAllocLow(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, bool fExecutable, const char *pszTag)
974	{
975	IPRT_LINUX_SAVE_EFL_AC();
976	PRTR0MEMOBJLNX pMemLnx;
977	int rc;
978
979	/* Try to avoid GFP_DMA. GFM_DMA32 was introduced with Linux 2.6.15. */
980	#if (defined(RT_ARCH_AMD64) \|\| defined(CONFIG_X86_PAE)) && defined(GFP_DMA32)
981	/* ZONE_DMA32: 0-4GB */
982	rc = rtR0MemObjLinuxAllocPages(&pMemLnx, RTR0MEMOBJTYPE_LOW, cb, PAGE_SIZE, GFP_DMA32,
983	false /* non-contiguous */, fExecutable, VERR_NO_LOW_MEMORY, pszTag);
984	if (RT_FAILURE(rc))
985	#endif
986	#ifdef RT_ARCH_AMD64
987	/* ZONE_DMA: 0-16MB */
988	rc = rtR0MemObjLinuxAllocPages(&pMemLnx, RTR0MEMOBJTYPE_LOW, cb, PAGE_SIZE, GFP_DMA,
989	false /* non-contiguous */, fExecutable, VERR_NO_LOW_MEMORY, pszTag);
990	#else
991	# ifdef CONFIG_X86_PAE
992	# endif
993	/* ZONE_NORMAL: 0-896MB */
994	rc = rtR0MemObjLinuxAllocPages(&pMemLnx, RTR0MEMOBJTYPE_LOW, cb, PAGE_SIZE, GFP_USER,
995	false /* non-contiguous */, fExecutable, VERR_NO_LOW_MEMORY, pszTag);
996	#endif
997	if (RT_SUCCESS(rc))
998	{
999	rc = rtR0MemObjLinuxVMap(pMemLnx, fExecutable);
1000	if (RT_SUCCESS(rc))
1001	{
1002	*ppMem = &pMemLnx->Core;
1003	IPRT_LINUX_RESTORE_EFL_AC();
1004	return rc;
1005	}
1006
1007	rtR0MemObjLinuxFreePages(pMemLnx);
1008	rtR0MemObjDelete(&pMemLnx->Core);
1009	}
1010
1011	IPRT_LINUX_RESTORE_EFL_AC();
1012	return rc;
1013	}
1014
1015
1016	DECLHIDDEN(int) rtR0MemObjNativeAllocCont(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, RTHCPHYS PhysHighest,
1017	bool fExecutable, const char *pszTag)
1018	{
1019	IPRT_LINUX_SAVE_EFL_AC();
1020	PRTR0MEMOBJLNX pMemLnx;
1021	int rc;
1022	uint32_t idxZone;
1023
1024	/*
1025	* The last zone must be able to satisfy the PhysHighest requirement or there
1026	* will be no zone at all.
1027	*/
1028	if (g_aZones[RT_ELEMENTS(g_aZones) - 1].PhysHighest > PhysHighest)
1029	{
1030	IPRT_LINUX_RESTORE_EFL_AC();
1031	AssertMsgFailedReturn(("No zone can satisfy PhysHighest=%RHp!\n", PhysHighest),
1032	VERR_NO_CONT_MEMORY);
1033	}
1034
1035	/* Find the first zone matching our PhysHighest requirement. */
1036	idxZone = 0;
1037	for (;;)
1038	{
1039	if (g_aZones[idxZone].PhysHighest <= PhysHighest)
1040	break; /* We found a zone satisfying the requirement. */
1041	idxZone++;
1042	}
1043
1044	/* Now try to allocate pages from all the left zones until one succeeds. */
1045	for (;;)
1046	{
1047	rc = rtR0MemObjLinuxAllocPages(&pMemLnx, RTR0MEMOBJTYPE_CONT, cb, PAGE_SIZE, g_aZones[idxZone].fGfp,
1048	true /* contiguous */, fExecutable, VERR_NO_CONT_MEMORY, pszTag);
1049	idxZone++;
1050	if (RT_SUCCESS(rc) \|\| idxZone == RT_ELEMENTS(g_aZones))
1051	break;
1052	}
1053	if (RT_SUCCESS(rc))
1054	{
1055	rc = rtR0MemObjLinuxVMap(pMemLnx, fExecutable);
1056	if (RT_SUCCESS(rc))
1057	{
1058	#if defined(RT_STRICT)
1059	size_t iPage = pMemLnx->cPages;
1060	while (iPage-- > 0)
1061	Assert(page_to_phys(pMemLnx->apPages[iPage]) < PhysHighest);
1062	#endif
1063	pMemLnx->Core.u.Cont.Phys = page_to_phys(pMemLnx->apPages[0]);
1064	*ppMem = &pMemLnx->Core;
1065	IPRT_LINUX_RESTORE_EFL_AC();
1066	return rc;
1067	}
1068
1069	rtR0MemObjLinuxFreePages(pMemLnx);
1070	rtR0MemObjDelete(&pMemLnx->Core);
1071	}
1072
1073	IPRT_LINUX_RESTORE_EFL_AC();
1074	return rc;
1075	}
1076
1077
1078	/**
1079	* Worker for rtR0MemObjLinuxAllocPhysSub that tries one allocation strategy.
1080	*
1081	* @returns IPRT status code.
1082	* @param ppMemLnx Where to
1083	* @param enmType The object type.
1084	* @param cb The size of the allocation.
1085	* @param uAlignment The alignment of the physical memory.
1086	* Only valid for fContiguous == true, ignored otherwise.
1087	* @param PhysHighest See rtR0MemObjNativeAllocPhys.
1088	* @param pszTag Allocation tag used for statistics and such.
1089	* @param fGfp The Linux GFP flags to use for the allocation.
1090	*/
1091	static int rtR0MemObjLinuxAllocPhysSub2(PPRTR0MEMOBJINTERNAL ppMem, RTR0MEMOBJTYPE enmType,
1092	size_t cb, size_t uAlignment, RTHCPHYS PhysHighest, const char *pszTag, gfp_t fGfp)
1093	{
1094	PRTR0MEMOBJLNX pMemLnx;
1095	int rc = rtR0MemObjLinuxAllocPages(&pMemLnx, enmType, cb, uAlignment, fGfp,
1096	enmType == RTR0MEMOBJTYPE_PHYS /* contiguous / non-contiguous */,
1097	false /fExecutable/, VERR_NO_PHYS_MEMORY, pszTag);
1098	if (RT_FAILURE(rc))
1099	return rc;
1100
1101	/*
1102	* Check the addresses if necessary. (Can be optimized a bit for PHYS.)
1103	*/
1104	if (PhysHighest != NIL_RTHCPHYS)
1105	{
1106	size_t iPage = pMemLnx->cPages;
1107	while (iPage-- > 0)
1108	if (page_to_phys(pMemLnx->apPages[iPage]) > PhysHighest)
1109	{
1110	rtR0MemObjLinuxFreePages(pMemLnx);
1111	rtR0MemObjDelete(&pMemLnx->Core);
1112	return VERR_NO_MEMORY;
1113	}
1114	}
1115
1116	/*
1117	* Complete the object.
1118	*/
1119	if (enmType == RTR0MEMOBJTYPE_PHYS)
1120	{
1121	pMemLnx->Core.u.Phys.PhysBase = page_to_phys(pMemLnx->apPages[0]);
1122	pMemLnx->Core.u.Phys.fAllocated = true;
1123	}
1124	*ppMem = &pMemLnx->Core;
1125	return rc;
1126	}
1127
1128
1129	/**
1130	* Worker for rtR0MemObjNativeAllocPhys and rtR0MemObjNativeAllocPhysNC.
1131	*
1132	* @returns IPRT status code.
1133	* @param ppMem Where to store the memory object pointer on success.
1134	* @param enmType The object type.
1135	* @param cb The size of the allocation.
1136	* @param uAlignment The alignment of the physical memory.
1137	* Only valid for enmType == RTR0MEMOBJTYPE_PHYS, ignored otherwise.
1138	* @param PhysHighest See rtR0MemObjNativeAllocPhys.
1139	* @param pszTag Allocation tag used for statistics and such.
1140	*/
1141	static int rtR0MemObjLinuxAllocPhysSub(PPRTR0MEMOBJINTERNAL ppMem, RTR0MEMOBJTYPE enmType,
1142	size_t cb, size_t uAlignment, RTHCPHYS PhysHighest, const char *pszTag)
1143	{
1144	int rc;
1145	IPRT_LINUX_SAVE_EFL_AC();
1146
1147	/*
1148	* There are two clear cases and that's the <=16MB and anything-goes ones.
1149	* When the physical address limit is somewhere in-between those two we'll
1150	* just have to try, starting with HIGHUSER and working our way thru the
1151	* different types, hoping we'll get lucky.
1152	*
1153	* We should probably move this physical address restriction logic up to
1154	* the page alloc function as it would be more efficient there. But since
1155	* we don't expect this to be a performance issue just yet it can wait.
1156	*/
1157	if (PhysHighest == NIL_RTHCPHYS)
1158	/* ZONE_HIGHMEM: the whole physical memory */
1159	rc = rtR0MemObjLinuxAllocPhysSub2(ppMem, enmType, cb, uAlignment, PhysHighest, pszTag, GFP_HIGHUSER);
1160	else if (PhysHighest <= _1M * 16)
1161	/* ZONE_DMA: 0-16MB */
1162	rc = rtR0MemObjLinuxAllocPhysSub2(ppMem, enmType, cb, uAlignment, PhysHighest, pszTag, GFP_DMA);
1163	else
1164	{
1165	rc = VERR_NO_MEMORY;
1166	if (RT_FAILURE(rc))
1167	/* ZONE_HIGHMEM: the whole physical memory */
1168	rc = rtR0MemObjLinuxAllocPhysSub2(ppMem, enmType, cb, uAlignment, PhysHighest, pszTag, GFP_HIGHUSER);
1169	if (RT_FAILURE(rc))
1170	/* ZONE_NORMAL: 0-896MB */
1171	rc = rtR0MemObjLinuxAllocPhysSub2(ppMem, enmType, cb, uAlignment, PhysHighest, pszTag, GFP_USER);
1172	#ifdef GFP_DMA32
1173	if (RT_FAILURE(rc))
1174	/* ZONE_DMA32: 0-4GB */
1175	rc = rtR0MemObjLinuxAllocPhysSub2(ppMem, enmType, cb, uAlignment, PhysHighest, pszTag, GFP_DMA32);
1176	#endif
1177	if (RT_FAILURE(rc))
1178	/* ZONE_DMA: 0-16MB */
1179	rc = rtR0MemObjLinuxAllocPhysSub2(ppMem, enmType, cb, uAlignment, PhysHighest, pszTag, GFP_DMA);
1180	}
1181	IPRT_LINUX_RESTORE_EFL_AC();
1182	return rc;
1183	}
1184
1185
1186	/**
1187	* Translates a kernel virtual address to a linux page structure by walking the
1188	* page tables.
1189	*
1190	* @note We do assume that the page tables will not change as we are walking
1191	* them. This assumption is rather forced by the fact that I could not
1192	* immediately see any way of preventing this from happening. So, we
1193	* take some extra care when accessing them.
1194	*
1195	* Because of this, we don't want to use this function on memory where
1196	* attribute changes to nearby pages is likely to cause large pages to
1197	* be used or split up. So, don't use this for the linear mapping of
1198	* physical memory.
1199	*
1200	* @returns Pointer to the page structur or NULL if it could not be found.
1201	* @param pv The kernel virtual address.
1202	*/
1203	RTDECL(struct page ) rtR0MemObjLinuxVirtToPage(void pv)
1204	{
1205	#if defined(RT_ARCH_AMD64) \|\| defined(RT_ARCH_X86)
1206	unsigned long ulAddr = (unsigned long)pv;
1207	unsigned long pfn;
1208	struct page *pPage;
1209	pte_t *pEntry;
1210	union
1211	{
1212	pgd_t Global;
1213	# if RTLNX_VER_MIN(4,12,0)
1214	p4d_t Four;
1215	# endif
1216	# if RTLNX_VER_MIN(2,6,11)
1217	pud_t Upper;
1218	# endif
1219	pmd_t Middle;
1220	pte_t Entry;
1221	} u;
1222
1223	/* Should this happen in a situation this code will be called in? And if
1224	* so, can it change under our feet? See also
1225	* "Documentation/vm/active_mm.txt" in the kernel sources. */
1226	if (RT_UNLIKELY(!current->active_mm))
1227	return NULL;
1228	u.Global = *pgd_offset(current->active_mm, ulAddr);
1229	if (RT_UNLIKELY(pgd_none(u.Global)))
1230	return NULL;
1231	# if RTLNX_VER_MIN(2,6,11)
1232	# if RTLNX_VER_MIN(4,12,0)
1233	u.Four = *p4d_offset(&u.Global, ulAddr);
1234	if (RT_UNLIKELY(p4d_none(u.Four)))
1235	return NULL;
1236	# if RTLNX_VER_MIN(5,6,0)
1237	if (p4d_leaf(u.Four))
1238	# else
1239	if (p4d_large(u.Four))
1240	# endif
1241	{
1242	pPage = p4d_page(u.Four);
1243	AssertReturn(pPage, NULL);
1244	pfn = page_to_pfn(pPage); /* doing the safe way... */
1245	AssertCompile(P4D_SHIFT - PAGE_SHIFT < 31);
1246	pfn += (ulAddr >> PAGE_SHIFT) & ((UINT32_C(1) << (P4D_SHIFT - PAGE_SHIFT)) - 1);
1247	return pfn_to_page(pfn);
1248	}
1249	u.Upper = *pud_offset(&u.Four, ulAddr);
1250	# else /* < 4.12 */
1251	u.Upper = *pud_offset(&u.Global, ulAddr);
1252	# endif /* < 4.12 */
1253	if (RT_UNLIKELY(pud_none(u.Upper)))
1254	return NULL;
1255	# if RTLNX_VER_MIN(2,6,25)
1256	# if RTLNX_VER_MIN(5,6,0)
1257	if (pud_leaf(u.Upper))
1258	# else
1259	if (pud_large(u.Upper))
1260	# endif
1261	{
1262	pPage = pud_page(u.Upper);
1263	AssertReturn(pPage, NULL);
1264	pfn = page_to_pfn(pPage); /* doing the safe way... */
1265	pfn += (ulAddr >> PAGE_SHIFT) & ((UINT32_C(1) << (PUD_SHIFT - PAGE_SHIFT)) - 1);
1266	return pfn_to_page(pfn);
1267	}
1268	# endif
1269	u.Middle = *pmd_offset(&u.Upper, ulAddr);
1270	# else /* < 2.6.11 */
1271	u.Middle = *pmd_offset(&u.Global, ulAddr);
1272	# endif /* < 2.6.11 */
1273	if (RT_UNLIKELY(pmd_none(u.Middle)))
1274	return NULL;
1275	# if RTLNX_VER_MIN(2,6,0)
1276	# if RTLNX_VER_MIN(5,6,0)
1277	if (pmd_leaf(u.Middle))
1278	# else
1279	if (pmd_large(u.Middle))
1280	# endif
1281	{
1282	pPage = pmd_page(u.Middle);
1283	AssertReturn(pPage, NULL);
1284	pfn = page_to_pfn(pPage); /* doing the safe way... */
1285	pfn += (ulAddr >> PAGE_SHIFT) & ((UINT32_C(1) << (PMD_SHIFT - PAGE_SHIFT)) - 1);
1286	return pfn_to_page(pfn);
1287	}
1288	# endif
1289
1290	# if RTLNX_VER_MIN(6,5,0) \|\| RTLNX_RHEL_RANGE(9,4, 9,99)
1291	pEntry = __pte_map(&u.Middle, ulAddr);
1292	# elif RTLNX_VER_MIN(2,5,5) \|\| defined(pte_offset_map) /* As usual, RHEL 3 had pte_offset_map earlier. */
1293	pEntry = pte_offset_map(&u.Middle, ulAddr);
1294	# else
1295	pEntry = pte_offset(&u.Middle, ulAddr);
1296	# endif
1297	if (RT_UNLIKELY(!pEntry))
1298	return NULL;
1299	u.Entry = *pEntry;
1300	# if RTLNX_VER_MIN(2,5,5) \|\| defined(pte_offset_map)
1301	pte_unmap(pEntry);
1302	# endif
1303
1304	if (RT_UNLIKELY(!pte_present(u.Entry)))
1305	return NULL;
1306	return pte_page(u.Entry);
1307	#else /* !defined(RT_ARCH_AMD64) && !defined(RT_ARCH_X86) */
1308
1309	if (is_vmalloc_addr(pv))
1310	return vmalloc_to_page(pv);
1311
1312	return virt_to_page(pv);
1313	#endif
1314	}
1315	RT_EXPORT_SYMBOL(rtR0MemObjLinuxVirtToPage);
1316
1317
1318	DECLHIDDEN(int) rtR0MemObjNativeAllocPhys(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, RTHCPHYS PhysHighest, size_t uAlignment,
1319	const char *pszTag)
1320	{
1321	return rtR0MemObjLinuxAllocPhysSub(ppMem, RTR0MEMOBJTYPE_PHYS, cb, uAlignment, PhysHighest, pszTag);
1322	}
1323
1324
1325	DECLHIDDEN(int) rtR0MemObjNativeAllocPhysNC(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, RTHCPHYS PhysHighest, const char *pszTag)
1326	{
1327	return rtR0MemObjLinuxAllocPhysSub(ppMem, RTR0MEMOBJTYPE_PHYS_NC, cb, PAGE_SIZE, PhysHighest, pszTag);
1328	}
1329
1330
1331	DECLHIDDEN(int) rtR0MemObjNativeEnterPhys(PPRTR0MEMOBJINTERNAL ppMem, RTHCPHYS Phys, size_t cb, uint32_t uCachePolicy,
1332	const char *pszTag)
1333	{
1334	IPRT_LINUX_SAVE_EFL_AC();
1335
1336	/*
1337	* All we need to do here is to validate that we can use
1338	* ioremap on the specified address (32/64-bit dma_addr_t).
1339	*/
1340	PRTR0MEMOBJLNX pMemLnx;
1341	dma_addr_t PhysAddr = Phys;
1342	AssertMsgReturn(PhysAddr == Phys, ("%#llx\n", (unsigned long long)Phys), VERR_ADDRESS_TOO_BIG);
1343
1344	pMemLnx = (PRTR0MEMOBJLNX)rtR0MemObjNew(sizeof(*pMemLnx), RTR0MEMOBJTYPE_PHYS, NULL, cb, pszTag);
1345	if (!pMemLnx)
1346	{
1347	IPRT_LINUX_RESTORE_EFL_AC();
1348	return VERR_NO_MEMORY;
1349	}
1350
1351	pMemLnx->Core.u.Phys.PhysBase = PhysAddr;
1352	pMemLnx->Core.u.Phys.fAllocated = false;
1353	pMemLnx->Core.u.Phys.uCachePolicy = uCachePolicy;
1354	Assert(!pMemLnx->cPages);
1355	*ppMem = &pMemLnx->Core;
1356	IPRT_LINUX_RESTORE_EFL_AC();
1357	return VINF_SUCCESS;
1358	}
1359
1360	/* openSUSE Leap 42.3 detection :-/ */
1361	#if RTLNX_VER_RANGE(4,4,0, 4,6,0) && defined(FAULT_FLAG_REMOTE)
1362	# define GET_USER_PAGES_API KERNEL_VERSION(4, 10, 0) /* no typo! */
1363	#else
1364	# define GET_USER_PAGES_API LINUX_VERSION_CODE
1365	#endif
1366
1367	DECLHIDDEN(int) rtR0MemObjNativeLockUser(PPRTR0MEMOBJINTERNAL ppMem, RTR3PTR R3Ptr, size_t cb, uint32_t fAccess,
1368	RTR0PROCESS R0Process, const char *pszTag)
1369	{
1370	IPRT_LINUX_SAVE_EFL_AC();
1371	const int cPages = cb >> PAGE_SHIFT;
1372	struct task_struct *pTask = rtR0ProcessToLinuxTask(R0Process);
1373	# if GET_USER_PAGES_API < KERNEL_VERSION(6, 5, 0)
1374	struct vm_area_struct **papVMAs;
1375	# endif
1376	PRTR0MEMOBJLNX pMemLnx;
1377	int rc = VERR_NO_MEMORY;
1378	int const fWrite = fAccess & RTMEM_PROT_WRITE ? 1 : 0;
1379
1380	/*
1381	* Check for valid task and size overflows.
1382	*/
1383	if (!pTask)
1384	return VERR_NOT_SUPPORTED;
1385	if (((size_t)cPages << PAGE_SHIFT) != cb)
1386	return VERR_OUT_OF_RANGE;
1387
1388	/*
1389	* Allocate the memory object and a temporary buffer for the VMAs.
1390	*/
1391	pMemLnx = (PRTR0MEMOBJLNX)rtR0MemObjNew(RT_UOFFSETOF_DYN(RTR0MEMOBJLNX, apPages[cPages]), RTR0MEMOBJTYPE_LOCK,
1392	(void *)R3Ptr, cb, pszTag);
1393	if (!pMemLnx)
1394	{
1395	IPRT_LINUX_RESTORE_EFL_AC();
1396	return VERR_NO_MEMORY;
1397	}
1398
1399	# if GET_USER_PAGES_API < KERNEL_VERSION(6, 5, 0)
1400	papVMAs = (struct vm_area_struct *)RTMemAlloc(sizeof(papVMAs) * cPages);
1401	if (papVMAs)
1402	{
1403	# endif
1404	LNX_MM_DOWN_READ(pTask->mm);
1405
1406	/*
1407	* Get user pages.
1408	*/
1409	/** @todo r=bird: Should we not force read access too? */
1410	#if GET_USER_PAGES_API >= KERNEL_VERSION(4, 6, 0)
1411	if (R0Process == RTR0ProcHandleSelf())
1412	rc = get_user_pages(R3Ptr, /* Where from. */
1413	cPages, /* How many pages. */
1414	# if GET_USER_PAGES_API >= KERNEL_VERSION(4, 9, 0)
1415	fWrite ? FOLL_WRITE \| /* Write to memory. */
1416	FOLL_FORCE /* force write access. */
1417	: 0, /* Write to memory. */
1418	# else
1419	fWrite, /* Write to memory. */
1420	fWrite, /* force write access. */
1421	# endif
1422	&pMemLnx->apPages[0] /* Page array. */
1423	# if GET_USER_PAGES_API < KERNEL_VERSION(6, 5, 0) && !RTLNX_SUSE_MAJ_PREREQ(15, 6)
1424	, papVMAs /* vmas */
1425	# endif
1426	);
1427	/*
1428	* Actually this should not happen at the moment as call this function
1429	* only for our own process.
1430	*/
1431	else
1432	rc = get_user_pages_remote(
1433	# if GET_USER_PAGES_API < KERNEL_VERSION(5, 9, 0)
1434	pTask, /* Task for fault accounting. */
1435	# endif
1436	pTask->mm, /* Whose pages. */
1437	R3Ptr, /* Where from. */
1438	cPages, /* How many pages. */
1439	# if GET_USER_PAGES_API >= KERNEL_VERSION(4, 9, 0)
1440	fWrite ? FOLL_WRITE \| /* Write to memory. */
1441	FOLL_FORCE /* force write access. */
1442	: 0, /* Write to memory. */
1443	# else
1444	fWrite, /* Write to memory. */
1445	fWrite, /* force write access. */
1446	# endif
1447	&pMemLnx->apPages[0] /* Page array. */
1448	# if GET_USER_PAGES_API < KERNEL_VERSION(6, 5, 0)
1449	, papVMAs /* vmas */
1450	# endif
1451	# if GET_USER_PAGES_API >= KERNEL_VERSION(4, 10, 0)
1452	, NULL /* locked */
1453	# endif
1454	);
1455	#else /* GET_USER_PAGES_API < KERNEL_VERSION(4, 6, 0) */
1456	rc = get_user_pages(pTask, /* Task for fault accounting. */
1457	pTask->mm, /* Whose pages. */
1458	R3Ptr, /* Where from. */
1459	cPages, /* How many pages. */
1460	/* The get_user_pages API change was back-ported to 4.4.168. */
1461	# if RTLNX_VER_RANGE(4,4,168, 4,5,0)
1462	fWrite ? FOLL_WRITE \| /* Write to memory. */
1463	FOLL_FORCE /* force write access. */
1464	: 0, /* Write to memory. */
1465	# else
1466	fWrite, /* Write to memory. */
1467	fWrite, /* force write access. */
1468	# endif
1469	&pMemLnx->apPages[0], /* Page array. */
1470	papVMAs /* vmas */
1471	);
1472	#endif /* GET_USER_PAGES_API < KERNEL_VERSION(4, 6, 0) */
1473	if (rc == cPages)
1474	{
1475	/*
1476	* Flush dcache (required?), protect against fork and _really_ pin the page
1477	* table entries. get_user_pages() will protect against swapping out the
1478	* pages but it will NOT protect against removing page table entries. This
1479	* can be achieved with
1480	* - using mlock / mmap(..., MAP_LOCKED, ...) from userland. This requires
1481	* an appropriate limit set up with setrlimit(..., RLIMIT_MEMLOCK, ...).
1482	* Usual Linux distributions support only a limited size of locked pages
1483	* (e.g. 32KB).
1484	* - setting the PageReserved bit (as we do in rtR0MemObjLinuxAllocPages()
1485	* or by
1486	* - setting the VM_LOCKED flag. This is the same as doing mlock() without
1487	* a range check.
1488	*/
1489	/** @todo The Linux fork() protection will require more work if this API
1490	* is to be used for anything but locking VM pages. */
1491	while (rc-- > 0)
1492	{
1493	flush_dcache_page(pMemLnx->apPages[rc]);
1494	# if GET_USER_PAGES_API < KERNEL_VERSION(6, 5, 0) && !RTLNX_SUSE_MAJ_PREREQ(15, 6) && !RTLNX_RHEL_RANGE(9,5, 9,99)
1495	# if RTLNX_VER_MIN(6,3,0)
1496	vm_flags_set(papVMAs[rc], VM_DONTCOPY \| VM_LOCKED);
1497	# else
1498	papVMAs[rc]->vm_flags \|= VM_DONTCOPY \| VM_LOCKED;
1499	# endif
1500	# endif
1501	}
1502
1503	LNX_MM_UP_READ(pTask->mm);
1504
1505	# if GET_USER_PAGES_API < KERNEL_VERSION(6, 5, 0)
1506	RTMemFree(papVMAs);
1507	# endif
1508
1509	pMemLnx->Core.u.Lock.R0Process = R0Process;
1510	pMemLnx->cPages = cPages;
1511	Assert(!pMemLnx->fMappedToRing0);
1512	*ppMem = &pMemLnx->Core;
1513
1514	IPRT_LINUX_RESTORE_EFL_AC();
1515	return VINF_SUCCESS;
1516	}
1517
1518	/*
1519	* Failed - we need to unlock any pages that we succeeded to lock.
1520	*/
1521	while (rc-- > 0)
1522	{
1523	if (!PageReserved(pMemLnx->apPages[rc]))
1524	SetPageDirty(pMemLnx->apPages[rc]);
1525	#if RTLNX_VER_MIN(4,6,0)
1526	put_page(pMemLnx->apPages[rc]);
1527	#else
1528	page_cache_release(pMemLnx->apPages[rc]);
1529	#endif
1530	}
1531
1532	LNX_MM_UP_READ(pTask->mm);
1533
1534	rc = VERR_LOCK_FAILED;
1535
1536	# if GET_USER_PAGES_API < KERNEL_VERSION(6, 5, 0)
1537	RTMemFree(papVMAs);
1538	}
1539	# endif
1540
1541	rtR0MemObjDelete(&pMemLnx->Core);
1542	IPRT_LINUX_RESTORE_EFL_AC();
1543	return rc;
1544	}
1545
1546
1547	DECLHIDDEN(int) rtR0MemObjNativeLockKernel(PPRTR0MEMOBJINTERNAL ppMem, void pv, size_t cb, uint32_t fAccess, const char pszTag)
1548	{
1549	IPRT_LINUX_SAVE_EFL_AC();
1550	void pvLast = (uint8_t )pv + cb - 1;
1551	size_t const cPages = cb >> PAGE_SHIFT;
1552	PRTR0MEMOBJLNX pMemLnx;
1553	bool fLinearMapping;
1554	int rc;
1555	uint8_t *pbPage;
1556	size_t iPage;
1557	NOREF(fAccess);
1558
1559	if ( !RTR0MemKernelIsValidAddr(pv)
1560	\|\| !RTR0MemKernelIsValidAddr(pv + cb))
1561	return VERR_INVALID_PARAMETER;
1562
1563	/*
1564	* The lower part of the kernel memory has a linear mapping between
1565	* physical and virtual addresses. So we take a short cut here. This is
1566	* assumed to be the cleanest way to handle those addresses (and the code
1567	* is well tested, though the test for determining it is not very nice).
1568	* If we ever decide it isn't we can still remove it.
1569	*/
1570	#if 0
1571	fLinearMapping = (unsigned long)pvLast < VMALLOC_START;
1572	#else
1573	fLinearMapping = (unsigned long)pv >= (unsigned long)__va(0)
1574	&& (unsigned long)pvLast < (unsigned long)high_memory;
1575	#endif
1576
1577	/*
1578	* Allocate the memory object.
1579	*/
1580	pMemLnx = (PRTR0MEMOBJLNX)rtR0MemObjNew(RT_UOFFSETOF_DYN(RTR0MEMOBJLNX, apPages[cPages]), RTR0MEMOBJTYPE_LOCK,
1581	pv, cb, pszTag);
1582	if (!pMemLnx)
1583	{
1584	IPRT_LINUX_RESTORE_EFL_AC();
1585	return VERR_NO_MEMORY;
1586	}
1587
1588	/*
1589	* Gather the pages.
1590	* We ASSUME all kernel pages are non-swappable and non-movable.
1591	*/
1592	rc = VINF_SUCCESS;
1593	pbPage = (uint8_t *)pvLast;
1594	iPage = cPages;
1595	if (!fLinearMapping)
1596	{
1597	while (iPage-- > 0)
1598	{
1599	struct page *pPage = rtR0MemObjLinuxVirtToPage(pbPage);
1600	if (RT_UNLIKELY(!pPage))
1601	{
1602	rc = VERR_LOCK_FAILED;
1603	break;
1604	}
1605	pMemLnx->apPages[iPage] = pPage;
1606	pbPage -= PAGE_SIZE;
1607	}
1608	}
1609	else
1610	{
1611	while (iPage-- > 0)
1612	{
1613	pMemLnx->apPages[iPage] = virt_to_page(pbPage);
1614	pbPage -= PAGE_SIZE;
1615	}
1616	}
1617	if (RT_SUCCESS(rc))
1618	{
1619	/*
1620	* Complete the memory object and return.
1621	*/
1622	pMemLnx->Core.u.Lock.R0Process = NIL_RTR0PROCESS;
1623	pMemLnx->cPages = cPages;
1624	Assert(!pMemLnx->fMappedToRing0);
1625	*ppMem = &pMemLnx->Core;
1626
1627	IPRT_LINUX_RESTORE_EFL_AC();
1628	return VINF_SUCCESS;
1629	}
1630
1631	rtR0MemObjDelete(&pMemLnx->Core);
1632	IPRT_LINUX_RESTORE_EFL_AC();
1633	return rc;
1634	}
1635
1636
1637	DECLHIDDEN(int) rtR0MemObjNativeReserveKernel(PPRTR0MEMOBJINTERNAL ppMem, void *pvFixed, size_t cb, size_t uAlignment,
1638	const char *pszTag)
1639	{
1640	#if RTLNX_VER_MIN(2,4,22)
1641	IPRT_LINUX_SAVE_EFL_AC();
1642	const size_t cPages = cb >> PAGE_SHIFT;
1643	struct page *pDummyPage;
1644	struct page **papPages;
1645
1646	/* check for unsupported stuff. */
1647	AssertMsgReturn(pvFixed == (void *)-1, ("%p\n", pvFixed), VERR_NOT_SUPPORTED);
1648	if (uAlignment > PAGE_SIZE)
1649	return VERR_NOT_SUPPORTED;
1650
1651	/*
1652	* Allocate a dummy page and create a page pointer array for vmap such that
1653	* the dummy page is mapped all over the reserved area.
1654	*/
1655	pDummyPage = alloc_page(GFP_HIGHUSER \| __GFP_NOWARN);
1656	if (pDummyPage)
1657	{
1658	papPages = RTMemAlloc(sizeof(papPages) cPages);
1659	if (papPages)
1660	{
1661	void *pv;
1662	size_t iPage = cPages;
1663	while (iPage-- > 0)
1664	papPages[iPage] = pDummyPage;
1665	# ifdef VM_MAP
1666	pv = vmap(papPages, cPages, VM_MAP, PAGE_KERNEL_RO);
1667	# else
1668	pv = vmap(papPages, cPages, VM_ALLOC, PAGE_KERNEL_RO);
1669	# endif
1670	RTMemFree(papPages);
1671	if (pv)
1672	{
1673	PRTR0MEMOBJLNX pMemLnx = (PRTR0MEMOBJLNX)rtR0MemObjNew(sizeof(*pMemLnx), RTR0MEMOBJTYPE_RES_VIRT, pv, cb, pszTag);
1674	if (pMemLnx)
1675	{
1676	pMemLnx->Core.u.ResVirt.R0Process = NIL_RTR0PROCESS;
1677	pMemLnx->cPages = 1;
1678	pMemLnx->apPages[0] = pDummyPage;
1679	*ppMem = &pMemLnx->Core;
1680	IPRT_LINUX_RESTORE_EFL_AC();
1681	return VINF_SUCCESS;
1682	}
1683	vunmap(pv);
1684	}
1685	}
1686	__free_page(pDummyPage);
1687	}
1688	IPRT_LINUX_RESTORE_EFL_AC();
1689	return VERR_NO_MEMORY;
1690
1691	#else /* < 2.4.22 */
1692	/*
1693	* Could probably use ioremap here, but the caller is in a better position than us
1694	* to select some safe physical memory.
1695	*/
1696	return VERR_NOT_SUPPORTED;
1697	#endif
1698	}
1699
1700
1701	DECLHIDDEN(int) rtR0MemObjNativeReserveUser(PPRTR0MEMOBJINTERNAL ppMem, RTR3PTR R3PtrFixed, size_t cb, size_t uAlignment,
1702	RTR0PROCESS R0Process, const char *pszTag)
1703	{
1704	IPRT_LINUX_SAVE_EFL_AC();
1705	PRTR0MEMOBJLNX pMemLnx;
1706	void *pv;
1707	struct task_struct *pTask = rtR0ProcessToLinuxTask(R0Process);
1708	if (!pTask)
1709	return VERR_NOT_SUPPORTED;
1710
1711	/*
1712	* Check that the specified alignment is supported.
1713	*/
1714	if (uAlignment > PAGE_SIZE)
1715	return VERR_NOT_SUPPORTED;
1716
1717	/*
1718	* Let rtR0MemObjLinuxDoMmap do the difficult bits.
1719	*/
1720	pv = rtR0MemObjLinuxDoMmap(R3PtrFixed, cb, uAlignment, pTask, RTMEM_PROT_NONE);
1721	if (pv == (void *)-1)
1722	{
1723	IPRT_LINUX_RESTORE_EFL_AC();
1724	return VERR_NO_MEMORY;
1725	}
1726
1727	pMemLnx = (PRTR0MEMOBJLNX)rtR0MemObjNew(sizeof(*pMemLnx), RTR0MEMOBJTYPE_RES_VIRT, pv, cb, pszTag);
1728	if (!pMemLnx)
1729	{
1730	rtR0MemObjLinuxDoMunmap(pv, cb, pTask);
1731	IPRT_LINUX_RESTORE_EFL_AC();
1732	return VERR_NO_MEMORY;
1733	}
1734
1735	pMemLnx->Core.u.ResVirt.R0Process = R0Process;
1736	*ppMem = &pMemLnx->Core;
1737	IPRT_LINUX_RESTORE_EFL_AC();
1738	return VINF_SUCCESS;
1739	}
1740
1741
1742	DECLHIDDEN(int) rtR0MemObjNativeMapKernel(PPRTR0MEMOBJINTERNAL ppMem, RTR0MEMOBJ pMemToMap, void *pvFixed, size_t uAlignment,
1743	unsigned fProt, size_t offSub, size_t cbSub, const char *pszTag)
1744	{
1745	int rc = VERR_NO_MEMORY;
1746	PRTR0MEMOBJLNX pMemLnxToMap = (PRTR0MEMOBJLNX)pMemToMap;
1747	PRTR0MEMOBJLNX pMemLnx;
1748	IPRT_LINUX_SAVE_EFL_AC();
1749
1750	/* Fail if requested to do something we can't. */
1751	AssertMsgReturn(pvFixed == (void *)-1, ("%p\n", pvFixed), VERR_NOT_SUPPORTED);
1752	if (uAlignment > PAGE_SIZE)
1753	return VERR_NOT_SUPPORTED;
1754
1755	/*
1756	* Create the IPRT memory object.
1757	*/
1758	if (!cbSub)
1759	cbSub = pMemLnxToMap->Core.cb - offSub;
1760	pMemLnx = (PRTR0MEMOBJLNX)rtR0MemObjNew(sizeof(*pMemLnx), RTR0MEMOBJTYPE_MAPPING, NULL, cbSub, pszTag);
1761	if (pMemLnx)
1762	{
1763	if (pMemLnxToMap->cPages)
1764	{
1765	#if RTLNX_VER_MIN(2,4,22)
1766	/*
1767	* Use vmap - 2.4.22 and later.
1768	*/
1769	pgprot_t fPg = rtR0MemObjLinuxConvertProt(fProt, true /* kernel */);
1770	/** @todo We don't really care too much for EXEC here... 5.8 always adds NX. */
1771	Assert(((offSub + cbSub) >> PAGE_SHIFT) <= pMemLnxToMap->cPages);
1772	# ifdef VM_MAP
1773	pMemLnx->Core.pv = vmap(&pMemLnxToMap->apPages[offSub >> PAGE_SHIFT], cbSub >> PAGE_SHIFT, VM_MAP, fPg);
1774	# else
1775	pMemLnx->Core.pv = vmap(&pMemLnxToMap->apPages[offSub >> PAGE_SHIFT], cbSub >> PAGE_SHIFT, VM_ALLOC, fPg);
1776	# endif
1777	if (pMemLnx->Core.pv)
1778	{
1779	pMemLnx->fMappedToRing0 = true;
1780	rc = VINF_SUCCESS;
1781	}
1782	else
1783	rc = VERR_MAP_FAILED;
1784
1785	#else /* < 2.4.22 */
1786	/*
1787	* Only option here is to share mappings if possible and forget about fProt.
1788	*/
1789	if (rtR0MemObjIsRing3(pMemToMap))
1790	rc = VERR_NOT_SUPPORTED;
1791	else
1792	{
1793	rc = VINF_SUCCESS;
1794	if (!pMemLnxToMap->Core.pv)
1795	rc = rtR0MemObjLinuxVMap(pMemLnxToMap, !!(fProt & RTMEM_PROT_EXEC));
1796	if (RT_SUCCESS(rc))
1797	{
1798	Assert(pMemLnxToMap->Core.pv);
1799	pMemLnx->Core.pv = (uint8_t *)pMemLnxToMap->Core.pv + offSub;
1800	}
1801	}
1802	#endif
1803	}
1804	else
1805	{
1806	/*
1807	* MMIO / physical memory.
1808	*/
1809	Assert(pMemLnxToMap->Core.enmType == RTR0MEMOBJTYPE_PHYS && !pMemLnxToMap->Core.u.Phys.fAllocated);
1810	#if RTLNX_VER_MIN(2,6,25)
1811	/*
1812	* ioremap() defaults to no caching since the 2.6 kernels.
1813	* ioremap_nocache() has been removed finally in 5.6-rc1.
1814	*/
1815	pMemLnx->Core.pv = pMemLnxToMap->Core.u.Phys.uCachePolicy == RTMEM_CACHE_POLICY_MMIO
1816	? ioremap(pMemLnxToMap->Core.u.Phys.PhysBase + offSub, cbSub)
1817	: ioremap_cache(pMemLnxToMap->Core.u.Phys.PhysBase + offSub, cbSub);
1818	#else /* KERNEL_VERSION < 2.6.25 */
1819	pMemLnx->Core.pv = pMemLnxToMap->Core.u.Phys.uCachePolicy == RTMEM_CACHE_POLICY_MMIO
1820	? ioremap_nocache(pMemLnxToMap->Core.u.Phys.PhysBase + offSub, cbSub)
1821	: ioremap(pMemLnxToMap->Core.u.Phys.PhysBase + offSub, cbSub);
1822	#endif /* KERNEL_VERSION < 2.6.25 */
1823	if (pMemLnx->Core.pv)
1824	{
1825	/** @todo fix protection. */
1826	rc = VINF_SUCCESS;
1827	}
1828	}
1829	if (RT_SUCCESS(rc))
1830	{
1831	pMemLnx->Core.u.Mapping.R0Process = NIL_RTR0PROCESS;
1832	*ppMem = &pMemLnx->Core;
1833	IPRT_LINUX_RESTORE_EFL_AC();
1834	return VINF_SUCCESS;
1835	}
1836	rtR0MemObjDelete(&pMemLnx->Core);
1837	}
1838
1839	IPRT_LINUX_RESTORE_EFL_AC();
1840	return rc;
1841	}
1842
1843
1844	#ifdef VBOX_USE_PAE_HACK
1845	/**
1846	* Replace the PFN of a PTE with the address of the actual page.
1847	*
1848	* The caller maps a reserved dummy page at the address with the desired access
1849	* and flags.
1850	*
1851	* This hack is required for older Linux kernels which don't provide
1852	* remap_pfn_range().
1853	*
1854	* @returns 0 on success, -ENOMEM on failure.
1855	* @param mm The memory context.
1856	* @param ulAddr The mapping address.
1857	* @param Phys The physical address of the page to map.
1858	*/
1859	static int rtR0MemObjLinuxFixPte(struct mm_struct *mm, unsigned long ulAddr, RTHCPHYS Phys)
1860	{
1861	int rc = -ENOMEM;
1862	pgd_t *pgd;
1863
1864	spin_lock(&mm->page_table_lock);
1865
1866	pgd = pgd_offset(mm, ulAddr);
1867	if (!pgd_none(pgd) && !pgd_bad(pgd))
1868	{
1869	pmd_t *pmd = pmd_offset(pgd, ulAddr);
1870	if (!pmd_none(*pmd))
1871	{
1872	pte_t *ptep = pte_offset_map(pmd, ulAddr);
1873	if (ptep)
1874	{
1875	pte_t pte = *ptep;
1876	pte.pte_high &= 0xfff00000;
1877	pte.pte_high \|= ((Phys >> 32) & 0x000fffff);
1878	pte.pte_low &= 0x00000fff;
1879	pte.pte_low \|= (Phys & 0xfffff000);
1880	set_pte(ptep, pte);
1881	pte_unmap(ptep);
1882	rc = 0;
1883	}
1884	}
1885	}
1886
1887	spin_unlock(&mm->page_table_lock);
1888	return rc;
1889	}
1890	#endif /* VBOX_USE_PAE_HACK */
1891
1892
1893	DECLHIDDEN(int) rtR0MemObjNativeMapUser(PPRTR0MEMOBJINTERNAL ppMem, RTR0MEMOBJ pMemToMap, RTR3PTR R3PtrFixed, size_t uAlignment,
1894	unsigned fProt, RTR0PROCESS R0Process, size_t offSub, size_t cbSub, const char *pszTag)
1895	{
1896	struct task_struct *pTask = rtR0ProcessToLinuxTask(R0Process);
1897	PRTR0MEMOBJLNX pMemLnxToMap = (PRTR0MEMOBJLNX)pMemToMap;
1898	int rc = VERR_NO_MEMORY;
1899	PRTR0MEMOBJLNX pMemLnx;
1900	#ifdef VBOX_USE_PAE_HACK
1901	struct page *pDummyPage;
1902	RTHCPHYS DummyPhys;
1903	#endif
1904	IPRT_LINUX_SAVE_EFL_AC();
1905
1906	/*
1907	* Check for restrictions.
1908	*/
1909	if (!pTask)
1910	return VERR_NOT_SUPPORTED;
1911	if (uAlignment > PAGE_SIZE)
1912	return VERR_NOT_SUPPORTED;
1913
1914	#ifdef VBOX_USE_PAE_HACK
1915	/*
1916	* Allocate a dummy page for use when mapping the memory.
1917	*/
1918	pDummyPage = alloc_page(GFP_USER \| __GFP_NOWARN);
1919	if (!pDummyPage)
1920	{
1921	IPRT_LINUX_RESTORE_EFL_AC();
1922	return VERR_NO_MEMORY;
1923	}
1924	SetPageReserved(pDummyPage);
1925	DummyPhys = page_to_phys(pDummyPage);
1926	#endif
1927
1928	/*
1929	* Create the IPRT memory object.
1930	*/
1931	Assert(!offSub \|\| cbSub);
1932	if (cbSub == 0)
1933	cbSub = pMemLnxToMap->Core.cb;
1934	pMemLnx = (PRTR0MEMOBJLNX)rtR0MemObjNew(sizeof(*pMemLnx), RTR0MEMOBJTYPE_MAPPING, NULL, cbSub, pszTag);
1935	if (pMemLnx)
1936	{
1937	/*
1938	* Allocate user space mapping.
1939	*/
1940	void *pv;
1941	pv = rtR0MemObjLinuxDoMmap(R3PtrFixed, cbSub, uAlignment, pTask, fProt);
1942	if (pv != (void *)-1)
1943	{
1944	/*
1945	* Map page by page into the mmap area.
1946	* This is generic, paranoid and not very efficient.
1947	*/
1948	pgprot_t fPg = rtR0MemObjLinuxConvertProt(fProt, false /* user */);
1949	unsigned long ulAddrCur = (unsigned long)pv;
1950	const size_t cPages = (offSub + cbSub) >> PAGE_SHIFT;
1951	size_t iPage;
1952
1953	LNX_MM_DOWN_WRITE(pTask->mm);
1954
1955	rc = VINF_SUCCESS;
1956	if (pMemLnxToMap->cPages)
1957	{
1958	for (iPage = offSub >> PAGE_SHIFT; iPage < cPages; iPage++, ulAddrCur += PAGE_SIZE)
1959	{
1960	#if RTLNX_VER_MAX(2,6,11)
1961	RTHCPHYS Phys = page_to_phys(pMemLnxToMap->apPages[iPage]);
1962	#endif
1963	#if RTLNX_VER_MIN(2,6,0) \|\| defined(HAVE_26_STYLE_REMAP_PAGE_RANGE)
1964	struct vm_area_struct vma = find_vma(pTask->mm, ulAddrCur); / this is probably the same for all the pages... */
1965	AssertBreakStmt(vma, rc = VERR_INTERNAL_ERROR);
1966	#endif
1967	#if RTLNX_VER_MAX(2,6,0) && defined(RT_ARCH_X86)
1968	/* remap_page_range() limitation on x86 */
1969	AssertBreakStmt(Phys < _4G, rc = VERR_NO_MEMORY);
1970	#endif
1971
1972	#if defined(VBOX_USE_INSERT_PAGE) && RTLNX_VER_MIN(2,6,22)
1973	rc = vm_insert_page(vma, ulAddrCur, pMemLnxToMap->apPages[iPage]);
1974	/* Thes flags help making 100% sure some bad stuff wont happen (swap, core, ++).
1975	* See remap_pfn_range() in mm/memory.c */
1976
1977	#if RTLNX_VER_MIN(6,3,0) \|\| RTLNX_RHEL_RANGE(9,5, 9,99)
1978	vm_flags_set(vma, VM_DONTEXPAND \| VM_DONTDUMP);
1979	#elif RTLNX_VER_MIN(3,7,0)
1980	vma->vm_flags \|= VM_DONTEXPAND \| VM_DONTDUMP;
1981	#else
1982	vma->vm_flags \|= VM_RESERVED;
1983	#endif
1984	#elif RTLNX_VER_MIN(2,6,11)
1985	rc = remap_pfn_range(vma, ulAddrCur, page_to_pfn(pMemLnxToMap->apPages[iPage]), PAGE_SIZE, fPg);
1986	#elif defined(VBOX_USE_PAE_HACK)
1987	rc = remap_page_range(vma, ulAddrCur, DummyPhys, PAGE_SIZE, fPg);
1988	if (!rc)
1989	rc = rtR0MemObjLinuxFixPte(pTask->mm, ulAddrCur, Phys);
1990	#elif RTLNX_VER_MIN(2,6,0) \|\| defined(HAVE_26_STYLE_REMAP_PAGE_RANGE)
1991	rc = remap_page_range(vma, ulAddrCur, Phys, PAGE_SIZE, fPg);
1992	#else /* 2.4 */
1993	rc = remap_page_range(ulAddrCur, Phys, PAGE_SIZE, fPg);
1994	#endif
1995	if (rc)
1996	{
1997	rc = VERR_NO_MEMORY;
1998	break;
1999	}
2000	}
2001	}
2002	else
2003	{
2004	RTHCPHYS Phys;
2005	if (pMemLnxToMap->Core.enmType == RTR0MEMOBJTYPE_PHYS)
2006	Phys = pMemLnxToMap->Core.u.Phys.PhysBase;
2007	else if (pMemLnxToMap->Core.enmType == RTR0MEMOBJTYPE_CONT)
2008	Phys = pMemLnxToMap->Core.u.Cont.Phys;
2009	else
2010	{
2011	AssertMsgFailed(("%d\n", pMemLnxToMap->Core.enmType));
2012	Phys = NIL_RTHCPHYS;
2013	}
2014	if (Phys != NIL_RTHCPHYS)
2015	{
2016	for (iPage = offSub >> PAGE_SHIFT; iPage < cPages; iPage++, ulAddrCur += PAGE_SIZE, Phys += PAGE_SIZE)
2017	{
2018	#if RTLNX_VER_MIN(2,6,0) \|\| defined(HAVE_26_STYLE_REMAP_PAGE_RANGE)
2019	struct vm_area_struct vma = find_vma(pTask->mm, ulAddrCur); / this is probably the same for all the pages... */
2020	AssertBreakStmt(vma, rc = VERR_INTERNAL_ERROR);
2021	#endif
2022	#if RTLNX_VER_MAX(2,6,0) && defined(RT_ARCH_X86)
2023	/* remap_page_range() limitation on x86 */
2024	AssertBreakStmt(Phys < _4G, rc = VERR_NO_MEMORY);
2025	#endif
2026
2027	#if RTLNX_VER_MIN(2,6,11)
2028	rc = remap_pfn_range(vma, ulAddrCur, Phys, PAGE_SIZE, fPg);
2029	#elif defined(VBOX_USE_PAE_HACK)
2030	rc = remap_page_range(vma, ulAddrCur, DummyPhys, PAGE_SIZE, fPg);
2031	if (!rc)
2032	rc = rtR0MemObjLinuxFixPte(pTask->mm, ulAddrCur, Phys);
2033	#elif RTLNX_VER_MIN(2,6,0) \|\| defined(HAVE_26_STYLE_REMAP_PAGE_RANGE)
2034	rc = remap_page_range(vma, ulAddrCur, Phys, PAGE_SIZE, fPg);
2035	#else /* 2.4 */
2036	rc = remap_page_range(ulAddrCur, Phys, PAGE_SIZE, fPg);
2037	#endif
2038	if (rc)
2039	{
2040	rc = VERR_NO_MEMORY;
2041	break;
2042	}
2043	}
2044	}
2045	}
2046
2047	#ifdef CONFIG_NUMA_BALANCING
2048	# if RTLNX_VER_MAX(3,13,0) && RTLNX_RHEL_MAX(7,0)
2049	# define VBOX_NUMA_HACK_OLD
2050	# endif
2051	if (RT_SUCCESS(rc))
2052	{
2053	/** @todo Ugly hack! But right now we have no other means to
2054	* disable automatic NUMA page balancing. */
2055	# ifdef RT_OS_X86
2056	# ifdef VBOX_NUMA_HACK_OLD
2057	pTask->mm->numa_next_reset = jiffies + 0x7fffffffUL;
2058	# endif
2059	pTask->mm->numa_next_scan = jiffies + 0x7fffffffUL;
2060	# else
2061	# ifdef VBOX_NUMA_HACK_OLD
2062	pTask->mm->numa_next_reset = jiffies + 0x7fffffffffffffffUL;
2063	# endif
2064	pTask->mm->numa_next_scan = jiffies + 0x7fffffffffffffffUL;
2065	# endif
2066	}
2067	#endif /* CONFIG_NUMA_BALANCING */
2068
2069	LNX_MM_UP_WRITE(pTask->mm);
2070
2071	if (RT_SUCCESS(rc))
2072	{
2073	#ifdef VBOX_USE_PAE_HACK
2074	__free_page(pDummyPage);
2075	#endif
2076	pMemLnx->Core.pv = pv;
2077	pMemLnx->Core.u.Mapping.R0Process = R0Process;
2078	*ppMem = &pMemLnx->Core;
2079	IPRT_LINUX_RESTORE_EFL_AC();
2080	return VINF_SUCCESS;
2081	}
2082
2083	/*
2084	* Bail out.
2085	*/
2086	rtR0MemObjLinuxDoMunmap(pv, cbSub, pTask);
2087	}
2088	rtR0MemObjDelete(&pMemLnx->Core);
2089	}
2090	#ifdef VBOX_USE_PAE_HACK
2091	__free_page(pDummyPage);
2092	#endif
2093
2094	IPRT_LINUX_RESTORE_EFL_AC();
2095	return rc;
2096	}
2097
2098
2099	DECLHIDDEN(int) rtR0MemObjNativeProtect(PRTR0MEMOBJINTERNAL pMem, size_t offSub, size_t cbSub, uint32_t fProt)
2100	{
2101	# ifdef IPRT_USE_ALLOC_VM_AREA_FOR_EXEC
2102	/*
2103	* Currently only supported when we've got addresses PTEs from the kernel.
2104	*/
2105	PRTR0MEMOBJLNX pMemLnx = (PRTR0MEMOBJLNX)pMem;
2106	if (pMemLnx->pArea && pMemLnx->papPtesForArea)
2107	{
2108	pgprot_t const fPg = rtR0MemObjLinuxConvertProt(fProt, true /fKernel/);
2109	size_t const cPages = (offSub + cbSub) >> PAGE_SHIFT;
2110	pte_t **papPtes = pMemLnx->papPtesForArea;
2111	size_t i;
2112
2113	for (i = offSub >> PAGE_SHIFT; i < cPages; i++)
2114	{
2115	set_pte(papPtes[i], mk_pte(pMemLnx->apPages[i], fPg));
2116	}
2117	preempt_disable();
2118	__flush_tlb_all();
2119	preempt_enable();
2120	return VINF_SUCCESS;
2121	}
2122	# elif defined(IPRT_USE_APPLY_TO_PAGE_RANGE_FOR_EXEC)
2123	PRTR0MEMOBJLNX pMemLnx = (PRTR0MEMOBJLNX)pMem;
2124	if ( pMemLnx->fExecutable
2125	&& pMemLnx->fMappedToRing0)
2126	{
2127	LNXAPPLYPGRANGE Args;
2128	Args.pMemLnx = pMemLnx;
2129	Args.fPg = rtR0MemObjLinuxConvertProt(fProt, true /fKernel/);
2130	int rcLnx = apply_to_page_range(current->active_mm, (unsigned long)pMemLnx->Core.pv + offSub, cbSub,
2131	rtR0MemObjLinuxApplyPageRange, (void *)&Args);
2132	if (rcLnx)
2133	return VERR_NOT_SUPPORTED;
2134
2135	return VINF_SUCCESS;
2136	}
2137	# endif
2138
2139	NOREF(pMem);
2140	NOREF(offSub);
2141	NOREF(cbSub);
2142	NOREF(fProt);
2143	return VERR_NOT_SUPPORTED;
2144	}
2145
2146
2147	DECLHIDDEN(RTHCPHYS) rtR0MemObjNativeGetPagePhysAddr(PRTR0MEMOBJINTERNAL pMem, size_t iPage)
2148	{
2149	PRTR0MEMOBJLNX pMemLnx = (PRTR0MEMOBJLNX)pMem;
2150
2151	if (pMemLnx->cPages)
2152	return page_to_phys(pMemLnx->apPages[iPage]);
2153
2154	switch (pMemLnx->Core.enmType)
2155	{
2156	case RTR0MEMOBJTYPE_CONT:
2157	return pMemLnx->Core.u.Cont.Phys + (iPage << PAGE_SHIFT);
2158
2159	case RTR0MEMOBJTYPE_PHYS:
2160	return pMemLnx->Core.u.Phys.PhysBase + (iPage << PAGE_SHIFT);
2161
2162	/* the parent knows */
2163	case RTR0MEMOBJTYPE_MAPPING:
2164	return rtR0MemObjNativeGetPagePhysAddr(pMemLnx->Core.uRel.Child.pParent, iPage);
2165
2166	/* cPages > 0 */
2167	case RTR0MEMOBJTYPE_LOW:
2168	case RTR0MEMOBJTYPE_LOCK:
2169	case RTR0MEMOBJTYPE_PHYS_NC:
2170	case RTR0MEMOBJTYPE_PAGE:
2171	case RTR0MEMOBJTYPE_LARGE_PAGE:
2172	default:
2173	AssertMsgFailed(("%d\n", pMemLnx->Core.enmType));
2174	RT_FALL_THROUGH();
2175
2176	case RTR0MEMOBJTYPE_RES_VIRT:
2177	return NIL_RTHCPHYS;
2178	}
2179	}
2180
2181
2182	DECLHIDDEN(int) rtR0MemObjNativeZeroInitWithoutMapping(PRTR0MEMOBJINTERNAL pMem)
2183	{
2184	PRTR0MEMOBJLNX const pMemLnx = (PRTR0MEMOBJLNX)pMem;
2185	size_t const cPages = pMemLnx->Core.cb >> PAGE_SHIFT;
2186	size_t iPage;
2187	/** @todo optimize this. */
2188	for (iPage = 0; iPage < cPages; iPage++)
2189	{
2190	void *pvPage;
2191
2192	/* Get the physical address of the page. */
2193	RTHCPHYS const HCPhys = rtR0MemObjNativeGetPagePhysAddr(&pMemLnx->Core, iPage);
2194	AssertReturn(HCPhys != NIL_RTHCPHYS, VERR_INTERNAL_ERROR_3);
2195	Assert(!(HCPhys & PAGE_OFFSET_MASK));
2196
2197	/* Would've like to use valid_phys_addr_range for this test, but it isn't exported. */
2198	AssertReturn((HCPhys \| PAGE_OFFSET_MASK) < __pa(high_memory), VERR_INTERNAL_ERROR_3);
2199
2200	/* Map it. */
2201	pvPage = phys_to_virt(HCPhys);
2202	AssertPtrReturn(pvPage, VERR_INTERNAL_ERROR_3);
2203
2204	/* Zero it. */
2205	RT_BZERO(pvPage, PAGE_SIZE);
2206	}
2207	return VINF_SUCCESS;
2208	}
2209

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source: vbox/trunk/src/VBox/Runtime/r0drv/linux/memobj-r0drv-linux.c@ 104986

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