memobj-r0drv-linux.c@ 76734

Last change on this file since 76734 was 76553, checked in by vboxsync, 6 years ago
scm --update-copyright-year
Property svn:eol-style set to `native` Property svn:keywords set to `Id Rev Revision`
File size: 59.2 KB

Line
1	/* $Id: memobj-r0drv-linux.c 76553 2019-01-01 01:45:53Z vboxsync $ */
2	/** @file
3	* IPRT - Ring-0 Memory Objects, Linux.
4	*/
5
6	/*
7	* Copyright (C) 2006-2019 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*********************************************************************************************************************************
29	* Header Files *
30	*********************************************************************************************************************************/
31	#include "the-linux-kernel.h"
32
33	#include <iprt/memobj.h>
34	#include <iprt/assert.h>
35	#include <iprt/err.h>
36	#include <iprt/log.h>
37	#include <iprt/mem.h>
38	#include <iprt/process.h>
39	#include <iprt/string.h>
40	#include "internal/memobj.h"
41
42
43	/*********************************************************************************************************************************
44	* Defined Constants And Macros *
45	*********************************************************************************************************************************/
46	/* early 2.6 kernels */
47	#ifndef PAGE_SHARED_EXEC
48	# define PAGE_SHARED_EXEC PAGE_SHARED
49	#endif
50	#ifndef PAGE_READONLY_EXEC
51	# define PAGE_READONLY_EXEC PAGE_READONLY
52	#endif
53
54	/*
55	* 2.6.29+ kernels don't work with remap_pfn_range() anymore because
56	* track_pfn_vma_new() is apparently not defined for non-RAM pages.
57	* It should be safe to use vm_insert_page() older kernels as well.
58	*/
59	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23)
60	# define VBOX_USE_INSERT_PAGE
61	#endif
62	#if defined(CONFIG_X86_PAE) \
63	&& ( defined(HAVE_26_STYLE_REMAP_PAGE_RANGE) \
64	\|\| ( LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0) \
65	&& LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 11)))
66	# define VBOX_USE_PAE_HACK
67	#endif
68
69
70	/*********************************************************************************************************************************
71	* Structures and Typedefs *
72	*********************************************************************************************************************************/
73	/**
74	* The Darwin version of the memory object structure.
75	*/
76	typedef struct RTR0MEMOBJLNX
77	{
78	/** The core structure. */
79	RTR0MEMOBJINTERNAL Core;
80	/** Set if the allocation is contiguous.
81	* This means it has to be given back as one chunk. */
82	bool fContiguous;
83	/** Set if we've vmap'ed the memory into ring-0. */
84	bool fMappedToRing0;
85	/** The pages in the apPages array. */
86	size_t cPages;
87	/** Array of struct page pointers. (variable size) */
88	struct page *apPages[1];
89	} RTR0MEMOBJLNX, *PRTR0MEMOBJLNX;
90
91
92	static void rtR0MemObjLinuxFreePages(PRTR0MEMOBJLNX pMemLnx);
93
94
95	/**
96	* Helper that converts from a RTR0PROCESS handle to a linux task.
97	*
98	* @returns The corresponding Linux task.
99	* @param R0Process IPRT ring-0 process handle.
100	*/
101	static struct task_struct *rtR0ProcessToLinuxTask(RTR0PROCESS R0Process)
102	{
103	/** @todo fix rtR0ProcessToLinuxTask!! */
104	/** @todo many (all?) callers currently assume that we return 'current'! */
105	return R0Process == RTR0ProcHandleSelf() ? current : NULL;
106	}
107
108
109	/**
110	* Compute order. Some functions allocate 2^order pages.
111	*
112	* @returns order.
113	* @param cPages Number of pages.
114	*/
115	static int rtR0MemObjLinuxOrder(size_t cPages)
116	{
117	int iOrder;
118	size_t cTmp;
119
120	for (iOrder = 0, cTmp = cPages; cTmp >>= 1; ++iOrder)
121	;
122	if (cPages & ~((size_t)1 << iOrder))
123	++iOrder;
124
125	return iOrder;
126	}
127
128
129	/**
130	* Converts from RTMEM_PROT_* to Linux PAGE_*.
131	*
132	* @returns Linux page protection constant.
133	* @param fProt The IPRT protection mask.
134	* @param fKernel Whether it applies to kernel or user space.
135	*/
136	static pgprot_t rtR0MemObjLinuxConvertProt(unsigned fProt, bool fKernel)
137	{
138	switch (fProt)
139	{
140	default:
141	AssertMsgFailed(("%#x %d\n", fProt, fKernel));
142	case RTMEM_PROT_NONE:
143	return PAGE_NONE;
144
145	case RTMEM_PROT_READ:
146	return fKernel ? PAGE_KERNEL_RO : PAGE_READONLY;
147
148	case RTMEM_PROT_WRITE:
149	case RTMEM_PROT_WRITE \| RTMEM_PROT_READ:
150	return fKernel ? PAGE_KERNEL : PAGE_SHARED;
151
152	case RTMEM_PROT_EXEC:
153	case RTMEM_PROT_EXEC \| RTMEM_PROT_READ:
154	#if defined(RT_ARCH_X86) \|\| defined(RT_ARCH_AMD64)
155	if (fKernel)
156	{
157	pgprot_t fPg = MY_PAGE_KERNEL_EXEC;
158	pgprot_val(fPg) &= ~_PAGE_RW;
159	return fPg;
160	}
161	return PAGE_READONLY_EXEC;
162	#else
163	return fKernel ? MY_PAGE_KERNEL_EXEC : PAGE_READONLY_EXEC;
164	#endif
165
166	case RTMEM_PROT_WRITE \| RTMEM_PROT_EXEC:
167	case RTMEM_PROT_WRITE \| RTMEM_PROT_EXEC \| RTMEM_PROT_READ:
168	return fKernel ? MY_PAGE_KERNEL_EXEC : PAGE_SHARED_EXEC;
169	}
170	}
171
172
173	/**
174	* Worker for rtR0MemObjNativeReserveUser and rtR0MemObjNativerMapUser that creates
175	* an empty user space mapping.
176	*
177	* We acquire the mmap_sem of the task!
178	*
179	* @returns Pointer to the mapping.
180	* (void *)-1 on failure.
181	* @param R3PtrFixed (RTR3PTR)-1 if anywhere, otherwise a specific location.
182	* @param cb The size of the mapping.
183	* @param uAlignment The alignment of the mapping.
184	* @param pTask The Linux task to create this mapping in.
185	* @param fProt The RTMEM_PROT_* mask.
186	*/
187	static void rtR0MemObjLinuxDoMmap(RTR3PTR R3PtrFixed, size_t cb, size_t uAlignment, struct task_struct pTask, unsigned fProt)
188	{
189	unsigned fLnxProt;
190	unsigned long ulAddr;
191
192	Assert(pTask == current); /* do_mmap */
193	RT_NOREF_PV(pTask);
194
195	/*
196	* Convert from IPRT protection to mman.h PROT_ and call do_mmap.
197	*/
198	fProt &= (RTMEM_PROT_NONE \| RTMEM_PROT_READ \| RTMEM_PROT_WRITE \| RTMEM_PROT_EXEC);
199	if (fProt == RTMEM_PROT_NONE)
200	fLnxProt = PROT_NONE;
201	else
202	{
203	fLnxProt = 0;
204	if (fProt & RTMEM_PROT_READ)
205	fLnxProt \|= PROT_READ;
206	if (fProt & RTMEM_PROT_WRITE)
207	fLnxProt \|= PROT_WRITE;
208	if (fProt & RTMEM_PROT_EXEC)
209	fLnxProt \|= PROT_EXEC;
210	}
211
212	if (R3PtrFixed != (RTR3PTR)-1)
213	{
214	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)
215	ulAddr = vm_mmap(NULL, R3PtrFixed, cb, fLnxProt, MAP_SHARED \| MAP_ANONYMOUS \| MAP_FIXED, 0);
216	#else
217	down_write(&pTask->mm->mmap_sem);
218	ulAddr = do_mmap(NULL, R3PtrFixed, cb, fLnxProt, MAP_SHARED \| MAP_ANONYMOUS \| MAP_FIXED, 0);
219	up_write(&pTask->mm->mmap_sem);
220	#endif
221	}
222	else
223	{
224	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)
225	ulAddr = vm_mmap(NULL, 0, cb, fLnxProt, MAP_SHARED \| MAP_ANONYMOUS, 0);
226	#else
227	down_write(&pTask->mm->mmap_sem);
228	ulAddr = do_mmap(NULL, 0, cb, fLnxProt, MAP_SHARED \| MAP_ANONYMOUS, 0);
229	up_write(&pTask->mm->mmap_sem);
230	#endif
231	if ( !(ulAddr & ~PAGE_MASK)
232	&& (ulAddr & (uAlignment - 1)))
233	{
234	/** @todo implement uAlignment properly... We'll probably need to make some dummy mappings to fill
235	* up alignment gaps. This is of course complicated by fragmentation (which we might have cause
236	* ourselves) and further by there begin two mmap strategies (top / bottom). */
237	/* For now, just ignore uAlignment requirements... */
238	}
239	}
240
241
242	if (ulAddr & ~PAGE_MASK) /* ~PAGE_MASK == PAGE_OFFSET_MASK */
243	return (void *)-1;
244	return (void *)ulAddr;
245	}
246
247
248	/**
249	* Worker that destroys a user space mapping.
250	* Undoes what rtR0MemObjLinuxDoMmap did.
251	*
252	* We acquire the mmap_sem of the task!
253	*
254	* @param pv The ring-3 mapping.
255	* @param cb The size of the mapping.
256	* @param pTask The Linux task to destroy this mapping in.
257	*/
258	static void rtR0MemObjLinuxDoMunmap(void pv, size_t cb, struct task_struct pTask)
259	{
260	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)
261	Assert(pTask == current); RT_NOREF_PV(pTask);
262	vm_munmap((unsigned long)pv, cb);
263	#elif defined(USE_RHEL4_MUNMAP)
264	down_write(&pTask->mm->mmap_sem);
265	do_munmap(pTask->mm, (unsigned long)pv, cb, 0); /* should it be 1 or 0? */
266	up_write(&pTask->mm->mmap_sem);
267	#else
268	down_write(&pTask->mm->mmap_sem);
269	do_munmap(pTask->mm, (unsigned long)pv, cb);
270	up_write(&pTask->mm->mmap_sem);
271	#endif
272	}
273
274
275	/**
276	* Internal worker that allocates physical pages and creates the memory object for them.
277	*
278	* @returns IPRT status code.
279	* @param ppMemLnx Where to store the memory object pointer.
280	* @param enmType The object type.
281	* @param cb The number of bytes to allocate.
282	* @param uAlignment The alignment of the physical memory.
283	* Only valid if fContiguous == true, ignored otherwise.
284	* @param fFlagsLnx The page allocation flags (GPFs).
285	* @param fContiguous Whether the allocation must be contiguous.
286	* @param rcNoMem What to return when we're out of pages.
287	*/
288	static int rtR0MemObjLinuxAllocPages(PRTR0MEMOBJLNX *ppMemLnx, RTR0MEMOBJTYPE enmType, size_t cb,
289	size_t uAlignment, unsigned fFlagsLnx, bool fContiguous, int rcNoMem)
290	{
291	size_t iPage;
292	size_t const cPages = cb >> PAGE_SHIFT;
293	struct page *paPages;
294
295	/*
296	* Allocate a memory object structure that's large enough to contain
297	* the page pointer array.
298	*/
299	PRTR0MEMOBJLNX pMemLnx = (PRTR0MEMOBJLNX)rtR0MemObjNew(RT_UOFFSETOF_DYN(RTR0MEMOBJLNX, apPages[cPages]), enmType, NULL, cb);
300	if (!pMemLnx)
301	return VERR_NO_MEMORY;
302	pMemLnx->cPages = cPages;
303
304	if (cPages > 255)
305	{
306	# ifdef __GFP_REPEAT
307	/* Try hard to allocate the memory, but the allocation attempt might fail. */
308	fFlagsLnx \|= __GFP_REPEAT;
309	# endif
310	# ifdef __GFP_NOMEMALLOC
311	/* Introduced with Linux 2.6.12: Don't use emergency reserves */
312	fFlagsLnx \|= __GFP_NOMEMALLOC;
313	# endif
314	}
315
316	/*
317	* Allocate the pages.
318	* For small allocations we'll try contiguous first and then fall back on page by page.
319	*/
320	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 22)
321	if ( fContiguous
322	\|\| cb <= PAGE_SIZE * 2)
323	{
324	# ifdef VBOX_USE_INSERT_PAGE
325	paPages = alloc_pages(fFlagsLnx \| __GFP_COMP \| __GFP_NOWARN, rtR0MemObjLinuxOrder(cPages));
326	# else
327	paPages = alloc_pages(fFlagsLnx \| __GFP_NOWARN, rtR0MemObjLinuxOrder(cPages));
328	# endif
329	if (paPages)
330	{
331	fContiguous = true;
332	for (iPage = 0; iPage < cPages; iPage++)
333	pMemLnx->apPages[iPage] = &paPages[iPage];
334	}
335	else if (fContiguous)
336	{
337	rtR0MemObjDelete(&pMemLnx->Core);
338	return rcNoMem;
339	}
340	}
341
342	if (!fContiguous)
343	{
344	for (iPage = 0; iPage < cPages; iPage++)
345	{
346	pMemLnx->apPages[iPage] = alloc_page(fFlagsLnx \| __GFP_NOWARN);
347	if (RT_UNLIKELY(!pMemLnx->apPages[iPage]))
348	{
349	while (iPage-- > 0)
350	__free_page(pMemLnx->apPages[iPage]);
351	rtR0MemObjDelete(&pMemLnx->Core);
352	return rcNoMem;
353	}
354	}
355	}
356
357	#else /* < 2.4.22 */
358	/** @todo figure out why we didn't allocate page-by-page on 2.4.21 and older... */
359	paPages = alloc_pages(fFlagsLnx, rtR0MemObjLinuxOrder(cPages));
360	if (!paPages)
361	{
362	rtR0MemObjDelete(&pMemLnx->Core);
363	return rcNoMem;
364	}
365	for (iPage = 0; iPage < cPages; iPage++)
366	{
367	pMemLnx->apPages[iPage] = &paPages[iPage];
368	MY_SET_PAGES_EXEC(pMemLnx->apPages[iPage], 1);
369	if (PageHighMem(pMemLnx->apPages[iPage]))
370	BUG();
371	}
372
373	fContiguous = true;
374	#endif /* < 2.4.22 */
375	pMemLnx->fContiguous = fContiguous;
376
377	#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 5, 0)
378	/*
379	* Reserve the pages.
380	*
381	* Linux >= 4.5 with CONFIG_DEBUG_VM panics when setting PG_reserved on compound
382	* pages. According to Michal Hocko this shouldn't be necessary anyway because
383	* as pages which are not on the LRU list are never evictable.
384	*/
385	for (iPage = 0; iPage < cPages; iPage++)
386	SetPageReserved(pMemLnx->apPages[iPage]);
387	#endif
388
389	/*
390	* Note that the physical address of memory allocated with alloc_pages(flags, order)
391	* is always 2^(PAGE_SHIFT+order)-aligned.
392	*/
393	if ( fContiguous
394	&& uAlignment > PAGE_SIZE)
395	{
396	/*
397	* Check for alignment constraints. The physical address of memory allocated with
398	* alloc_pages(flags, order) is always 2^(PAGE_SHIFT+order)-aligned.
399	*/
400	if (RT_UNLIKELY(page_to_phys(pMemLnx->apPages[0]) & (uAlignment - 1)))
401	{
402	/*
403	* This should never happen!
404	*/
405	printk("rtR0MemObjLinuxAllocPages(cb=0x%lx, uAlignment=0x%lx): alloc_pages(..., %d) returned physical memory at 0x%lx!\n",
406	(unsigned long)cb, (unsigned long)uAlignment, rtR0MemObjLinuxOrder(cPages), (unsigned long)page_to_phys(pMemLnx->apPages[0]));
407	rtR0MemObjLinuxFreePages(pMemLnx);
408	return rcNoMem;
409	}
410	}
411
412	*ppMemLnx = pMemLnx;
413	return VINF_SUCCESS;
414	}
415
416
417	/**
418	* Frees the physical pages allocated by the rtR0MemObjLinuxAllocPages() call.
419	*
420	* This method does NOT free the object.
421	*
422	* @param pMemLnx The object which physical pages should be freed.
423	*/
424	static void rtR0MemObjLinuxFreePages(PRTR0MEMOBJLNX pMemLnx)
425	{
426	size_t iPage = pMemLnx->cPages;
427	if (iPage > 0)
428	{
429	/*
430	* Restore the page flags.
431	*/
432	while (iPage-- > 0)
433	{
434	#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 5, 0)
435	/*
436	* See SetPageReserved() in rtR0MemObjLinuxAllocPages()
437	*/
438	ClearPageReserved(pMemLnx->apPages[iPage]);
439	#endif
440	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 22)
441	#else
442	MY_SET_PAGES_NOEXEC(pMemLnx->apPages[iPage], 1);
443	#endif
444	}
445
446	/*
447	* Free the pages.
448	*/
449	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 22)
450	if (!pMemLnx->fContiguous)
451	{
452	iPage = pMemLnx->cPages;
453	while (iPage-- > 0)
454	__free_page(pMemLnx->apPages[iPage]);
455	}
456	else
457	#endif
458	__free_pages(pMemLnx->apPages[0], rtR0MemObjLinuxOrder(pMemLnx->cPages));
459
460	pMemLnx->cPages = 0;
461	}
462	}
463
464
465	/**
466	* Maps the allocation into ring-0.
467	*
468	* This will update the RTR0MEMOBJLNX::Core.pv and RTR0MEMOBJ::fMappedToRing0 members.
469	*
470	* Contiguous mappings that isn't in 'high' memory will already be mapped into kernel
471	* space, so we'll use that mapping if possible. If execute access is required, we'll
472	* play safe and do our own mapping.
473	*
474	* @returns IPRT status code.
475	* @param pMemLnx The linux memory object to map.
476	* @param fExecutable Whether execute access is required.
477	*/
478	static int rtR0MemObjLinuxVMap(PRTR0MEMOBJLNX pMemLnx, bool fExecutable)
479	{
480	int rc = VINF_SUCCESS;
481
482	/*
483	* Choose mapping strategy.
484	*/
485	bool fMustMap = fExecutable
486	\|\| !pMemLnx->fContiguous;
487	if (!fMustMap)
488	{
489	size_t iPage = pMemLnx->cPages;
490	while (iPage-- > 0)
491	if (PageHighMem(pMemLnx->apPages[iPage]))
492	{
493	fMustMap = true;
494	break;
495	}
496	}
497
498	Assert(!pMemLnx->Core.pv);
499	Assert(!pMemLnx->fMappedToRing0);
500
501	if (fMustMap)
502	{
503	/*
504	* Use vmap - 2.4.22 and later.
505	*/
506	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 22)
507	pgprot_t fPg;
508	pgprot_val(fPg) = _PAGE_PRESENT \| _PAGE_RW;
509	# ifdef _PAGE_NX
510	if (!fExecutable)
511	pgprot_val(fPg) \|= _PAGE_NX;
512	# endif
513
514	# ifdef VM_MAP
515	pMemLnx->Core.pv = vmap(&pMemLnx->apPages[0], pMemLnx->cPages, VM_MAP, fPg);
516	# else
517	pMemLnx->Core.pv = vmap(&pMemLnx->apPages[0], pMemLnx->cPages, VM_ALLOC, fPg);
518	# endif
519	if (pMemLnx->Core.pv)
520	pMemLnx->fMappedToRing0 = true;
521	else
522	rc = VERR_MAP_FAILED;
523	#else /* < 2.4.22 */
524	rc = VERR_NOT_SUPPORTED;
525	#endif
526	}
527	else
528	{
529	/*
530	* Use the kernel RAM mapping.
531	*/
532	pMemLnx->Core.pv = phys_to_virt(page_to_phys(pMemLnx->apPages[0]));
533	Assert(pMemLnx->Core.pv);
534	}
535
536	return rc;
537	}
538
539
540	/**
541	* Undoes what rtR0MemObjLinuxVMap() did.
542	*
543	* @param pMemLnx The linux memory object.
544	*/
545	static void rtR0MemObjLinuxVUnmap(PRTR0MEMOBJLNX pMemLnx)
546	{
547	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 22)
548	if (pMemLnx->fMappedToRing0)
549	{
550	Assert(pMemLnx->Core.pv);
551	vunmap(pMemLnx->Core.pv);
552	pMemLnx->fMappedToRing0 = false;
553	}
554	#else /* < 2.4.22 */
555	Assert(!pMemLnx->fMappedToRing0);
556	#endif
557	pMemLnx->Core.pv = NULL;
558	}
559
560
561	DECLHIDDEN(int) rtR0MemObjNativeFree(RTR0MEMOBJ pMem)
562	{
563	IPRT_LINUX_SAVE_EFL_AC();
564	PRTR0MEMOBJLNX pMemLnx = (PRTR0MEMOBJLNX)pMem;
565
566	/*
567	* Release any memory that we've allocated or locked.
568	*/
569	switch (pMemLnx->Core.enmType)
570	{
571	case RTR0MEMOBJTYPE_LOW:
572	case RTR0MEMOBJTYPE_PAGE:
573	case RTR0MEMOBJTYPE_CONT:
574	case RTR0MEMOBJTYPE_PHYS:
575	case RTR0MEMOBJTYPE_PHYS_NC:
576	rtR0MemObjLinuxVUnmap(pMemLnx);
577	rtR0MemObjLinuxFreePages(pMemLnx);
578	break;
579
580	case RTR0MEMOBJTYPE_LOCK:
581	if (pMemLnx->Core.u.Lock.R0Process != NIL_RTR0PROCESS)
582	{
583	struct task_struct *pTask = rtR0ProcessToLinuxTask(pMemLnx->Core.u.Lock.R0Process);
584	size_t iPage;
585	Assert(pTask);
586	if (pTask && pTask->mm)
587	down_read(&pTask->mm->mmap_sem);
588
589	iPage = pMemLnx->cPages;
590	while (iPage-- > 0)
591	{
592	if (!PageReserved(pMemLnx->apPages[iPage]))
593	SetPageDirty(pMemLnx->apPages[iPage]);
594	#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 6, 0)
595	put_page(pMemLnx->apPages[iPage]);
596	#else
597	page_cache_release(pMemLnx->apPages[iPage]);
598	#endif
599	}
600
601	if (pTask && pTask->mm)
602	up_read(&pTask->mm->mmap_sem);
603	}
604	/* else: kernel memory - nothing to do here. */
605	break;
606
607	case RTR0MEMOBJTYPE_RES_VIRT:
608	Assert(pMemLnx->Core.pv);
609	if (pMemLnx->Core.u.ResVirt.R0Process != NIL_RTR0PROCESS)
610	{
611	struct task_struct *pTask = rtR0ProcessToLinuxTask(pMemLnx->Core.u.Lock.R0Process);
612	Assert(pTask);
613	if (pTask && pTask->mm)
614	rtR0MemObjLinuxDoMunmap(pMemLnx->Core.pv, pMemLnx->Core.cb, pTask);
615	}
616	else
617	{
618	vunmap(pMemLnx->Core.pv);
619
620	Assert(pMemLnx->cPages == 1 && pMemLnx->apPages[0] != NULL);
621	__free_page(pMemLnx->apPages[0]);
622	pMemLnx->apPages[0] = NULL;
623	pMemLnx->cPages = 0;
624	}
625	pMemLnx->Core.pv = NULL;
626	break;
627
628	case RTR0MEMOBJTYPE_MAPPING:
629	Assert(pMemLnx->cPages == 0); Assert(pMemLnx->Core.pv);
630	if (pMemLnx->Core.u.ResVirt.R0Process != NIL_RTR0PROCESS)
631	{
632	struct task_struct *pTask = rtR0ProcessToLinuxTask(pMemLnx->Core.u.Lock.R0Process);
633	Assert(pTask);
634	if (pTask && pTask->mm)
635	rtR0MemObjLinuxDoMunmap(pMemLnx->Core.pv, pMemLnx->Core.cb, pTask);
636	}
637	else
638	vunmap(pMemLnx->Core.pv);
639	pMemLnx->Core.pv = NULL;
640	break;
641
642	default:
643	AssertMsgFailed(("enmType=%d\n", pMemLnx->Core.enmType));
644	return VERR_INTERNAL_ERROR;
645	}
646	IPRT_LINUX_RESTORE_EFL_ONLY_AC();
647	return VINF_SUCCESS;
648	}
649
650
651	DECLHIDDEN(int) rtR0MemObjNativeAllocPage(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, bool fExecutable)
652	{
653	IPRT_LINUX_SAVE_EFL_AC();
654	PRTR0MEMOBJLNX pMemLnx;
655	int rc;
656
657	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 22)
658	rc = rtR0MemObjLinuxAllocPages(&pMemLnx, RTR0MEMOBJTYPE_PAGE, cb, PAGE_SIZE, GFP_HIGHUSER,
659	false /* non-contiguous */, VERR_NO_MEMORY);
660	#else
661	rc = rtR0MemObjLinuxAllocPages(&pMemLnx, RTR0MEMOBJTYPE_PAGE, cb, PAGE_SIZE, GFP_USER,
662	false /* non-contiguous */, VERR_NO_MEMORY);
663	#endif
664	if (RT_SUCCESS(rc))
665	{
666	rc = rtR0MemObjLinuxVMap(pMemLnx, fExecutable);
667	if (RT_SUCCESS(rc))
668	{
669	*ppMem = &pMemLnx->Core;
670	IPRT_LINUX_RESTORE_EFL_AC();
671	return rc;
672	}
673
674	rtR0MemObjLinuxFreePages(pMemLnx);
675	rtR0MemObjDelete(&pMemLnx->Core);
676	}
677
678	IPRT_LINUX_RESTORE_EFL_AC();
679	return rc;
680	}
681
682
683	DECLHIDDEN(int) rtR0MemObjNativeAllocLow(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, bool fExecutable)
684	{
685	IPRT_LINUX_SAVE_EFL_AC();
686	PRTR0MEMOBJLNX pMemLnx;
687	int rc;
688
689	/* Try to avoid GFP_DMA. GFM_DMA32 was introduced with Linux 2.6.15. */
690	#if (defined(RT_ARCH_AMD64) \|\| defined(CONFIG_X86_PAE)) && defined(GFP_DMA32)
691	/* ZONE_DMA32: 0-4GB */
692	rc = rtR0MemObjLinuxAllocPages(&pMemLnx, RTR0MEMOBJTYPE_LOW, cb, PAGE_SIZE, GFP_DMA32,
693	false /* non-contiguous */, VERR_NO_LOW_MEMORY);
694	if (RT_FAILURE(rc))
695	#endif
696	#ifdef RT_ARCH_AMD64
697	/* ZONE_DMA: 0-16MB */
698	rc = rtR0MemObjLinuxAllocPages(&pMemLnx, RTR0MEMOBJTYPE_LOW, cb, PAGE_SIZE, GFP_DMA,
699	false /* non-contiguous */, VERR_NO_LOW_MEMORY);
700	#else
701	# ifdef CONFIG_X86_PAE
702	# endif
703	/* ZONE_NORMAL: 0-896MB */
704	rc = rtR0MemObjLinuxAllocPages(&pMemLnx, RTR0MEMOBJTYPE_LOW, cb, PAGE_SIZE, GFP_USER,
705	false /* non-contiguous */, VERR_NO_LOW_MEMORY);
706	#endif
707	if (RT_SUCCESS(rc))
708	{
709	rc = rtR0MemObjLinuxVMap(pMemLnx, fExecutable);
710	if (RT_SUCCESS(rc))
711	{
712	*ppMem = &pMemLnx->Core;
713	IPRT_LINUX_RESTORE_EFL_AC();
714	return rc;
715	}
716
717	rtR0MemObjLinuxFreePages(pMemLnx);
718	rtR0MemObjDelete(&pMemLnx->Core);
719	}
720
721	IPRT_LINUX_RESTORE_EFL_AC();
722	return rc;
723	}
724
725
726	DECLHIDDEN(int) rtR0MemObjNativeAllocCont(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, bool fExecutable)
727	{
728	IPRT_LINUX_SAVE_EFL_AC();
729	PRTR0MEMOBJLNX pMemLnx;
730	int rc;
731
732	#if (defined(RT_ARCH_AMD64) \|\| defined(CONFIG_X86_PAE)) && defined(GFP_DMA32)
733	/* ZONE_DMA32: 0-4GB */
734	rc = rtR0MemObjLinuxAllocPages(&pMemLnx, RTR0MEMOBJTYPE_CONT, cb, PAGE_SIZE, GFP_DMA32,
735	true /* contiguous */, VERR_NO_CONT_MEMORY);
736	if (RT_FAILURE(rc))
737	#endif
738	#ifdef RT_ARCH_AMD64
739	/* ZONE_DMA: 0-16MB */
740	rc = rtR0MemObjLinuxAllocPages(&pMemLnx, RTR0MEMOBJTYPE_CONT, cb, PAGE_SIZE, GFP_DMA,
741	true /* contiguous */, VERR_NO_CONT_MEMORY);
742	#else
743	/* ZONE_NORMAL (32-bit hosts): 0-896MB */
744	rc = rtR0MemObjLinuxAllocPages(&pMemLnx, RTR0MEMOBJTYPE_CONT, cb, PAGE_SIZE, GFP_USER,
745	true /* contiguous */, VERR_NO_CONT_MEMORY);
746	#endif
747	if (RT_SUCCESS(rc))
748	{
749	rc = rtR0MemObjLinuxVMap(pMemLnx, fExecutable);
750	if (RT_SUCCESS(rc))
751	{
752	#if defined(RT_STRICT) && (defined(RT_ARCH_AMD64) \|\| defined(CONFIG_HIGHMEM64G))
753	size_t iPage = pMemLnx->cPages;
754	while (iPage-- > 0)
755	Assert(page_to_phys(pMemLnx->apPages[iPage]) < _4G);
756	#endif
757	pMemLnx->Core.u.Cont.Phys = page_to_phys(pMemLnx->apPages[0]);
758	*ppMem = &pMemLnx->Core;
759	IPRT_LINUX_RESTORE_EFL_AC();
760	return rc;
761	}
762
763	rtR0MemObjLinuxFreePages(pMemLnx);
764	rtR0MemObjDelete(&pMemLnx->Core);
765	}
766
767	IPRT_LINUX_RESTORE_EFL_AC();
768	return rc;
769	}
770
771
772	/**
773	* Worker for rtR0MemObjLinuxAllocPhysSub that tries one allocation strategy.
774	*
775	* @returns IPRT status code.
776	* @param ppMemLnx Where to
777	* @param enmType The object type.
778	* @param cb The size of the allocation.
779	* @param uAlignment The alignment of the physical memory.
780	* Only valid for fContiguous == true, ignored otherwise.
781	* @param PhysHighest See rtR0MemObjNativeAllocPhys.
782	* @param fGfp The Linux GFP flags to use for the allocation.
783	*/
784	static int rtR0MemObjLinuxAllocPhysSub2(PPRTR0MEMOBJINTERNAL ppMem, RTR0MEMOBJTYPE enmType,
785	size_t cb, size_t uAlignment, RTHCPHYS PhysHighest, unsigned fGfp)
786	{
787	PRTR0MEMOBJLNX pMemLnx;
788	int rc;
789
790	rc = rtR0MemObjLinuxAllocPages(&pMemLnx, enmType, cb, uAlignment, fGfp,
791	enmType == RTR0MEMOBJTYPE_PHYS /* contiguous / non-contiguous */,
792	VERR_NO_PHYS_MEMORY);
793	if (RT_FAILURE(rc))
794	return rc;
795
796	/*
797	* Check the addresses if necessary. (Can be optimized a bit for PHYS.)
798	*/
799	if (PhysHighest != NIL_RTHCPHYS)
800	{
801	size_t iPage = pMemLnx->cPages;
802	while (iPage-- > 0)
803	if (page_to_phys(pMemLnx->apPages[iPage]) > PhysHighest)
804	{
805	rtR0MemObjLinuxFreePages(pMemLnx);
806	rtR0MemObjDelete(&pMemLnx->Core);
807	return VERR_NO_MEMORY;
808	}
809	}
810
811	/*
812	* Complete the object.
813	*/
814	if (enmType == RTR0MEMOBJTYPE_PHYS)
815	{
816	pMemLnx->Core.u.Phys.PhysBase = page_to_phys(pMemLnx->apPages[0]);
817	pMemLnx->Core.u.Phys.fAllocated = true;
818	}
819	*ppMem = &pMemLnx->Core;
820	return rc;
821	}
822
823
824	/**
825	* Worker for rtR0MemObjNativeAllocPhys and rtR0MemObjNativeAllocPhysNC.
826	*
827	* @returns IPRT status code.
828	* @param ppMem Where to store the memory object pointer on success.
829	* @param enmType The object type.
830	* @param cb The size of the allocation.
831	* @param uAlignment The alignment of the physical memory.
832	* Only valid for enmType == RTR0MEMOBJTYPE_PHYS, ignored otherwise.
833	* @param PhysHighest See rtR0MemObjNativeAllocPhys.
834	*/
835	static int rtR0MemObjLinuxAllocPhysSub(PPRTR0MEMOBJINTERNAL ppMem, RTR0MEMOBJTYPE enmType,
836	size_t cb, size_t uAlignment, RTHCPHYS PhysHighest)
837	{
838	int rc;
839	IPRT_LINUX_SAVE_EFL_AC();
840
841	/*
842	* There are two clear cases and that's the <=16MB and anything-goes ones.
843	* When the physical address limit is somewhere in-between those two we'll
844	* just have to try, starting with HIGHUSER and working our way thru the
845	* different types, hoping we'll get lucky.
846	*
847	* We should probably move this physical address restriction logic up to
848	* the page alloc function as it would be more efficient there. But since
849	* we don't expect this to be a performance issue just yet it can wait.
850	*/
851	if (PhysHighest == NIL_RTHCPHYS)
852	/* ZONE_HIGHMEM: the whole physical memory */
853	rc = rtR0MemObjLinuxAllocPhysSub2(ppMem, enmType, cb, uAlignment, PhysHighest, GFP_HIGHUSER);
854	else if (PhysHighest <= _1M * 16)
855	/* ZONE_DMA: 0-16MB */
856	rc = rtR0MemObjLinuxAllocPhysSub2(ppMem, enmType, cb, uAlignment, PhysHighest, GFP_DMA);
857	else
858	{
859	rc = VERR_NO_MEMORY;
860	if (RT_FAILURE(rc))
861	/* ZONE_HIGHMEM: the whole physical memory */
862	rc = rtR0MemObjLinuxAllocPhysSub2(ppMem, enmType, cb, uAlignment, PhysHighest, GFP_HIGHUSER);
863	if (RT_FAILURE(rc))
864	/* ZONE_NORMAL: 0-896MB */
865	rc = rtR0MemObjLinuxAllocPhysSub2(ppMem, enmType, cb, uAlignment, PhysHighest, GFP_USER);
866	#ifdef GFP_DMA32
867	if (RT_FAILURE(rc))
868	/* ZONE_DMA32: 0-4GB */
869	rc = rtR0MemObjLinuxAllocPhysSub2(ppMem, enmType, cb, uAlignment, PhysHighest, GFP_DMA32);
870	#endif
871	if (RT_FAILURE(rc))
872	/* ZONE_DMA: 0-16MB */
873	rc = rtR0MemObjLinuxAllocPhysSub2(ppMem, enmType, cb, uAlignment, PhysHighest, GFP_DMA);
874	}
875	IPRT_LINUX_RESTORE_EFL_AC();
876	return rc;
877	}
878
879
880	/**
881	* Translates a kernel virtual address to a linux page structure by walking the
882	* page tables.
883	*
884	* @note We do assume that the page tables will not change as we are walking
885	* them. This assumption is rather forced by the fact that I could not
886	* immediately see any way of preventing this from happening. So, we
887	* take some extra care when accessing them.
888	*
889	* Because of this, we don't want to use this function on memory where
890	* attribute changes to nearby pages is likely to cause large pages to
891	* be used or split up. So, don't use this for the linear mapping of
892	* physical memory.
893	*
894	* @returns Pointer to the page structur or NULL if it could not be found.
895	* @param pv The kernel virtual address.
896	*/
897	static struct page rtR0MemObjLinuxVirtToPage(void pv)
898	{
899	unsigned long ulAddr = (unsigned long)pv;
900	unsigned long pfn;
901	struct page *pPage;
902	pte_t *pEntry;
903	union
904	{
905	pgd_t Global;
906	#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 12, 0)
907	p4d_t Four;
908	#endif
909	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 11)
910	pud_t Upper;
911	#endif
912	pmd_t Middle;
913	pte_t Entry;
914	} u;
915
916	/* Should this happen in a situation this code will be called in? And if
917	* so, can it change under our feet? See also
918	* "Documentation/vm/active_mm.txt" in the kernel sources. */
919	if (RT_UNLIKELY(!current->active_mm))
920	return NULL;
921	u.Global = *pgd_offset(current->active_mm, ulAddr);
922	if (RT_UNLIKELY(pgd_none(u.Global)))
923	return NULL;
924	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 11)
925	# if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 12, 0)
926	u.Four = *p4d_offset(&u.Global, ulAddr);
927	if (RT_UNLIKELY(p4d_none(u.Four)))
928	return NULL;
929	if (p4d_large(u.Four))
930	{
931	pPage = p4d_page(u.Four);
932	AssertReturn(pPage, NULL);
933	pfn = page_to_pfn(pPage); /* doing the safe way... */
934	AssertCompile(P4D_SHIFT - PAGE_SHIFT < 31);
935	pfn += (ulAddr >> PAGE_SHIFT) & ((UINT32_C(1) << (P4D_SHIFT - PAGE_SHIFT)) - 1);
936	return pfn_to_page(pfn);
937	}
938	u.Upper = *pud_offset(&u.Four, ulAddr);
939	# else /* < 4.12 */
940	u.Upper = *pud_offset(&u.Global, ulAddr);
941	# endif /* < 4.12 */
942	if (RT_UNLIKELY(pud_none(u.Upper)))
943	return NULL;
944	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25)
945	if (pud_large(u.Upper))
946	{
947	pPage = pud_page(u.Upper);
948	AssertReturn(pPage, NULL);
949	pfn = page_to_pfn(pPage); /* doing the safe way... */
950	pfn += (ulAddr >> PAGE_SHIFT) & ((UINT32_C(1) << (PUD_SHIFT - PAGE_SHIFT)) - 1);
951	return pfn_to_page(pfn);
952	}
953	# endif
954	u.Middle = *pmd_offset(&u.Upper, ulAddr);
955	#else /* < 2.6.11 */
956	u.Middle = *pmd_offset(&u.Global, ulAddr);
957	#endif /* < 2.6.11 */
958	if (RT_UNLIKELY(pmd_none(u.Middle)))
959	return NULL;
960	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
961	if (pmd_large(u.Middle))
962	{
963	pPage = pmd_page(u.Middle);
964	AssertReturn(pPage, NULL);
965	pfn = page_to_pfn(pPage); /* doing the safe way... */
966	pfn += (ulAddr >> PAGE_SHIFT) & ((UINT32_C(1) << (PMD_SHIFT - PAGE_SHIFT)) - 1);
967	return pfn_to_page(pfn);
968	}
969	#endif
970
971	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 5) \|\| defined(pte_offset_map) /* As usual, RHEL 3 had pte_offset_map earlier. */
972	pEntry = pte_offset_map(&u.Middle, ulAddr);
973	#else
974	pEntry = pte_offset(&u.Middle, ulAddr);
975	#endif
976	if (RT_UNLIKELY(!pEntry))
977	return NULL;
978	u.Entry = *pEntry;
979	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 5) \|\| defined(pte_offset_map)
980	pte_unmap(pEntry);
981	#endif
982
983	if (RT_UNLIKELY(!pte_present(u.Entry)))
984	return NULL;
985	return pte_page(u.Entry);
986	}
987
988
989	DECLHIDDEN(int) rtR0MemObjNativeAllocPhys(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, RTHCPHYS PhysHighest, size_t uAlignment)
990	{
991	return rtR0MemObjLinuxAllocPhysSub(ppMem, RTR0MEMOBJTYPE_PHYS, cb, uAlignment, PhysHighest);
992	}
993
994
995	DECLHIDDEN(int) rtR0MemObjNativeAllocPhysNC(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, RTHCPHYS PhysHighest)
996	{
997	return rtR0MemObjLinuxAllocPhysSub(ppMem, RTR0MEMOBJTYPE_PHYS_NC, cb, PAGE_SIZE, PhysHighest);
998	}
999
1000
1001	DECLHIDDEN(int) rtR0MemObjNativeEnterPhys(PPRTR0MEMOBJINTERNAL ppMem, RTHCPHYS Phys, size_t cb, uint32_t uCachePolicy)
1002	{
1003	IPRT_LINUX_SAVE_EFL_AC();
1004
1005	/*
1006	* All we need to do here is to validate that we can use
1007	* ioremap on the specified address (32/64-bit dma_addr_t).
1008	*/
1009	PRTR0MEMOBJLNX pMemLnx;
1010	dma_addr_t PhysAddr = Phys;
1011	AssertMsgReturn(PhysAddr == Phys, ("%#llx\n", (unsigned long long)Phys), VERR_ADDRESS_TOO_BIG);
1012
1013	pMemLnx = (PRTR0MEMOBJLNX)rtR0MemObjNew(sizeof(*pMemLnx), RTR0MEMOBJTYPE_PHYS, NULL, cb);
1014	if (!pMemLnx)
1015	{
1016	IPRT_LINUX_RESTORE_EFL_AC();
1017	return VERR_NO_MEMORY;
1018	}
1019
1020	pMemLnx->Core.u.Phys.PhysBase = PhysAddr;
1021	pMemLnx->Core.u.Phys.fAllocated = false;
1022	pMemLnx->Core.u.Phys.uCachePolicy = uCachePolicy;
1023	Assert(!pMemLnx->cPages);
1024	*ppMem = &pMemLnx->Core;
1025	IPRT_LINUX_RESTORE_EFL_AC();
1026	return VINF_SUCCESS;
1027	}
1028
1029	/* openSUSE Leap 42.3 detection :-/ */
1030	#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 4, 0) \
1031	&& LINUX_VERSION_CODE < KERNEL_VERSION(4, 6, 0) \
1032	&& defined(FAULT_FLAG_REMOTE)
1033	# define GET_USER_PAGES_API KERNEL_VERSION(4, 10, 0) /* no typo! */
1034	#else
1035	# define GET_USER_PAGES_API LINUX_VERSION_CODE
1036	#endif
1037
1038	DECLHIDDEN(int) rtR0MemObjNativeLockUser(PPRTR0MEMOBJINTERNAL ppMem, RTR3PTR R3Ptr, size_t cb, uint32_t fAccess, RTR0PROCESS R0Process)
1039	{
1040	IPRT_LINUX_SAVE_EFL_AC();
1041	const int cPages = cb >> PAGE_SHIFT;
1042	struct task_struct *pTask = rtR0ProcessToLinuxTask(R0Process);
1043	struct vm_area_struct **papVMAs;
1044	PRTR0MEMOBJLNX pMemLnx;
1045	int rc = VERR_NO_MEMORY;
1046	int const fWrite = fAccess & RTMEM_PROT_WRITE ? 1 : 0;
1047
1048	/*
1049	* Check for valid task and size overflows.
1050	*/
1051	if (!pTask)
1052	return VERR_NOT_SUPPORTED;
1053	if (((size_t)cPages << PAGE_SHIFT) != cb)
1054	return VERR_OUT_OF_RANGE;
1055
1056	/*
1057	* Allocate the memory object and a temporary buffer for the VMAs.
1058	*/
1059	pMemLnx = (PRTR0MEMOBJLNX)rtR0MemObjNew(RT_UOFFSETOF_DYN(RTR0MEMOBJLNX, apPages[cPages]), RTR0MEMOBJTYPE_LOCK, (void *)R3Ptr, cb);
1060	if (!pMemLnx)
1061	{
1062	IPRT_LINUX_RESTORE_EFL_AC();
1063	return VERR_NO_MEMORY;
1064	}
1065
1066	papVMAs = (struct vm_area_struct *)RTMemAlloc(sizeof(papVMAs) * cPages);
1067	if (papVMAs)
1068	{
1069	down_read(&pTask->mm->mmap_sem);
1070
1071	/*
1072	* Get user pages.
1073	*/
1074	#if GET_USER_PAGES_API >= KERNEL_VERSION(4, 6, 0)
1075	if (R0Process == RTR0ProcHandleSelf())
1076	rc = get_user_pages(R3Ptr, /* Where from. */
1077	cPages, /* How many pages. */
1078	# if GET_USER_PAGES_API >= KERNEL_VERSION(4, 9, 0)
1079	fWrite ? FOLL_WRITE \| /* Write to memory. */
1080	FOLL_FORCE /* force write access. */
1081	: 0, /* Write to memory. */
1082	# else
1083	fWrite, /* Write to memory. */
1084	fWrite, /* force write access. */
1085	# endif
1086	&pMemLnx->apPages[0], /* Page array. */
1087	papVMAs); /* vmas */
1088	/*
1089	* Actually this should not happen at the moment as call this function
1090	* only for our own process.
1091	*/
1092	else
1093	rc = get_user_pages_remote(
1094	pTask, /* Task for fault accounting. */
1095	pTask->mm, /* Whose pages. */
1096	R3Ptr, /* Where from. */
1097	cPages, /* How many pages. */
1098	# if GET_USER_PAGES_API >= KERNEL_VERSION(4, 9, 0)
1099	fWrite ? FOLL_WRITE \| /* Write to memory. */
1100	FOLL_FORCE /* force write access. */
1101	: 0, /* Write to memory. */
1102	# else
1103	fWrite, /* Write to memory. */
1104	fWrite, /* force write access. */
1105	# endif
1106	&pMemLnx->apPages[0], /* Page array. */
1107	papVMAs /* vmas */
1108	# if GET_USER_PAGES_API >= KERNEL_VERSION(4, 10, 0)
1109	, NULL /* locked */
1110	# endif
1111	);
1112	#else /* GET_USER_PAGES_API < KERNEL_VERSION(4, 6, 0) */
1113	rc = get_user_pages(pTask, /* Task for fault accounting. */
1114	pTask->mm, /* Whose pages. */
1115	R3Ptr, /* Where from. */
1116	cPages, /* How many pages. */
1117	# if GET_USER_PAGES_API >= KERNEL_VERSION(4, 9, 0)
1118	fWrite ? FOLL_WRITE \| /* Write to memory. */
1119	FOLL_FORCE /* force write access. */
1120	: 0, /* Write to memory. */
1121	# else
1122	fWrite, /* Write to memory. */
1123	fWrite, /* force write access. */
1124	# endif
1125	&pMemLnx->apPages[0], /* Page array. */
1126	papVMAs); /* vmas */
1127	#endif /* GET_USER_PAGES_API < KERNEL_VERSION(4, 6, 0) */
1128	if (rc == cPages)
1129	{
1130	/*
1131	* Flush dcache (required?), protect against fork and _really_ pin the page
1132	* table entries. get_user_pages() will protect against swapping out the
1133	* pages but it will NOT protect against removing page table entries. This
1134	* can be achieved with
1135	* - using mlock / mmap(..., MAP_LOCKED, ...) from userland. This requires
1136	* an appropriate limit set up with setrlimit(..., RLIMIT_MEMLOCK, ...).
1137	* Usual Linux distributions support only a limited size of locked pages
1138	* (e.g. 32KB).
1139	* - setting the PageReserved bit (as we do in rtR0MemObjLinuxAllocPages()
1140	* or by
1141	* - setting the VM_LOCKED flag. This is the same as doing mlock() without
1142	* a range check.
1143	*/
1144	/** @todo The Linux fork() protection will require more work if this API
1145	* is to be used for anything but locking VM pages. */
1146	while (rc-- > 0)
1147	{
1148	flush_dcache_page(pMemLnx->apPages[rc]);
1149	papVMAs[rc]->vm_flags \|= (VM_DONTCOPY \| VM_LOCKED);
1150	}
1151
1152	up_read(&pTask->mm->mmap_sem);
1153
1154	RTMemFree(papVMAs);
1155
1156	pMemLnx->Core.u.Lock.R0Process = R0Process;
1157	pMemLnx->cPages = cPages;
1158	Assert(!pMemLnx->fMappedToRing0);
1159	*ppMem = &pMemLnx->Core;
1160
1161	IPRT_LINUX_RESTORE_EFL_AC();
1162	return VINF_SUCCESS;
1163	}
1164
1165	/*
1166	* Failed - we need to unlock any pages that we succeeded to lock.
1167	*/
1168	while (rc-- > 0)
1169	{
1170	if (!PageReserved(pMemLnx->apPages[rc]))
1171	SetPageDirty(pMemLnx->apPages[rc]);
1172	#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 6, 0)
1173	put_page(pMemLnx->apPages[rc]);
1174	#else
1175	page_cache_release(pMemLnx->apPages[rc]);
1176	#endif
1177	}
1178
1179	up_read(&pTask->mm->mmap_sem);
1180
1181	RTMemFree(papVMAs);
1182	rc = VERR_LOCK_FAILED;
1183	}
1184
1185	rtR0MemObjDelete(&pMemLnx->Core);
1186	IPRT_LINUX_RESTORE_EFL_AC();
1187	return rc;
1188	}
1189
1190
1191	DECLHIDDEN(int) rtR0MemObjNativeLockKernel(PPRTR0MEMOBJINTERNAL ppMem, void *pv, size_t cb, uint32_t fAccess)
1192	{
1193	IPRT_LINUX_SAVE_EFL_AC();
1194	void pvLast = (uint8_t )pv + cb - 1;
1195	size_t const cPages = cb >> PAGE_SHIFT;
1196	PRTR0MEMOBJLNX pMemLnx;
1197	bool fLinearMapping;
1198	int rc;
1199	uint8_t *pbPage;
1200	size_t iPage;
1201	NOREF(fAccess);
1202
1203	if ( !RTR0MemKernelIsValidAddr(pv)
1204	\|\| !RTR0MemKernelIsValidAddr(pv + cb))
1205	return VERR_INVALID_PARAMETER;
1206
1207	/*
1208	* The lower part of the kernel memory has a linear mapping between
1209	* physical and virtual addresses. So we take a short cut here. This is
1210	* assumed to be the cleanest way to handle those addresses (and the code
1211	* is well tested, though the test for determining it is not very nice).
1212	* If we ever decide it isn't we can still remove it.
1213	*/
1214	#if 0
1215	fLinearMapping = (unsigned long)pvLast < VMALLOC_START;
1216	#else
1217	fLinearMapping = (unsigned long)pv >= (unsigned long)__va(0)
1218	&& (unsigned long)pvLast < (unsigned long)high_memory;
1219	#endif
1220
1221	/*
1222	* Allocate the memory object.
1223	*/
1224	pMemLnx = (PRTR0MEMOBJLNX)rtR0MemObjNew(RT_UOFFSETOF_DYN(RTR0MEMOBJLNX, apPages[cPages]), RTR0MEMOBJTYPE_LOCK, pv, cb);
1225	if (!pMemLnx)
1226	{
1227	IPRT_LINUX_RESTORE_EFL_AC();
1228	return VERR_NO_MEMORY;
1229	}
1230
1231	/*
1232	* Gather the pages.
1233	* We ASSUME all kernel pages are non-swappable and non-movable.
1234	*/
1235	rc = VINF_SUCCESS;
1236	pbPage = (uint8_t *)pvLast;
1237	iPage = cPages;
1238	if (!fLinearMapping)
1239	{
1240	while (iPage-- > 0)
1241	{
1242	struct page *pPage = rtR0MemObjLinuxVirtToPage(pbPage);
1243	if (RT_UNLIKELY(!pPage))
1244	{
1245	rc = VERR_LOCK_FAILED;
1246	break;
1247	}
1248	pMemLnx->apPages[iPage] = pPage;
1249	pbPage -= PAGE_SIZE;
1250	}
1251	}
1252	else
1253	{
1254	while (iPage-- > 0)
1255	{
1256	pMemLnx->apPages[iPage] = virt_to_page(pbPage);
1257	pbPage -= PAGE_SIZE;
1258	}
1259	}
1260	if (RT_SUCCESS(rc))
1261	{
1262	/*
1263	* Complete the memory object and return.
1264	*/
1265	pMemLnx->Core.u.Lock.R0Process = NIL_RTR0PROCESS;
1266	pMemLnx->cPages = cPages;
1267	Assert(!pMemLnx->fMappedToRing0);
1268	*ppMem = &pMemLnx->Core;
1269
1270	IPRT_LINUX_RESTORE_EFL_AC();
1271	return VINF_SUCCESS;
1272	}
1273
1274	rtR0MemObjDelete(&pMemLnx->Core);
1275	IPRT_LINUX_RESTORE_EFL_AC();
1276	return rc;
1277	}
1278
1279
1280	DECLHIDDEN(int) rtR0MemObjNativeReserveKernel(PPRTR0MEMOBJINTERNAL ppMem, void *pvFixed, size_t cb, size_t uAlignment)
1281	{
1282	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 22)
1283	IPRT_LINUX_SAVE_EFL_AC();
1284	const size_t cPages = cb >> PAGE_SHIFT;
1285	struct page *pDummyPage;
1286	struct page **papPages;
1287
1288	/* check for unsupported stuff. */
1289	AssertMsgReturn(pvFixed == (void *)-1, ("%p\n", pvFixed), VERR_NOT_SUPPORTED);
1290	if (uAlignment > PAGE_SIZE)
1291	return VERR_NOT_SUPPORTED;
1292
1293	/*
1294	* Allocate a dummy page and create a page pointer array for vmap such that
1295	* the dummy page is mapped all over the reserved area.
1296	*/
1297	pDummyPage = alloc_page(GFP_HIGHUSER \| __GFP_NOWARN);
1298	if (pDummyPage)
1299	{
1300	papPages = RTMemAlloc(sizeof(papPages) cPages);
1301	if (papPages)
1302	{
1303	void *pv;
1304	size_t iPage = cPages;
1305	while (iPage-- > 0)
1306	papPages[iPage] = pDummyPage;
1307	# ifdef VM_MAP
1308	pv = vmap(papPages, cPages, VM_MAP, PAGE_KERNEL_RO);
1309	# else
1310	pv = vmap(papPages, cPages, VM_ALLOC, PAGE_KERNEL_RO);
1311	# endif
1312	RTMemFree(papPages);
1313	if (pv)
1314	{
1315	PRTR0MEMOBJLNX pMemLnx = (PRTR0MEMOBJLNX)rtR0MemObjNew(sizeof(*pMemLnx), RTR0MEMOBJTYPE_RES_VIRT, pv, cb);
1316	if (pMemLnx)
1317	{
1318	pMemLnx->Core.u.ResVirt.R0Process = NIL_RTR0PROCESS;
1319	pMemLnx->cPages = 1;
1320	pMemLnx->apPages[0] = pDummyPage;
1321	*ppMem = &pMemLnx->Core;
1322	IPRT_LINUX_RESTORE_EFL_AC();
1323	return VINF_SUCCESS;
1324	}
1325	vunmap(pv);
1326	}
1327	}
1328	__free_page(pDummyPage);
1329	}
1330	IPRT_LINUX_RESTORE_EFL_AC();
1331	return VERR_NO_MEMORY;
1332
1333	#else /* < 2.4.22 */
1334	/*
1335	* Could probably use ioremap here, but the caller is in a better position than us
1336	* to select some safe physical memory.
1337	*/
1338	return VERR_NOT_SUPPORTED;
1339	#endif
1340	}
1341
1342
1343	DECLHIDDEN(int) rtR0MemObjNativeReserveUser(PPRTR0MEMOBJINTERNAL ppMem, RTR3PTR R3PtrFixed, size_t cb, size_t uAlignment, RTR0PROCESS R0Process)
1344	{
1345	IPRT_LINUX_SAVE_EFL_AC();
1346	PRTR0MEMOBJLNX pMemLnx;
1347	void *pv;
1348	struct task_struct *pTask = rtR0ProcessToLinuxTask(R0Process);
1349	if (!pTask)
1350	return VERR_NOT_SUPPORTED;
1351
1352	/*
1353	* Check that the specified alignment is supported.
1354	*/
1355	if (uAlignment > PAGE_SIZE)
1356	return VERR_NOT_SUPPORTED;
1357
1358	/*
1359	* Let rtR0MemObjLinuxDoMmap do the difficult bits.
1360	*/
1361	pv = rtR0MemObjLinuxDoMmap(R3PtrFixed, cb, uAlignment, pTask, RTMEM_PROT_NONE);
1362	if (pv == (void *)-1)
1363	{
1364	IPRT_LINUX_RESTORE_EFL_AC();
1365	return VERR_NO_MEMORY;
1366	}
1367
1368	pMemLnx = (PRTR0MEMOBJLNX)rtR0MemObjNew(sizeof(*pMemLnx), RTR0MEMOBJTYPE_RES_VIRT, pv, cb);
1369	if (!pMemLnx)
1370	{
1371	rtR0MemObjLinuxDoMunmap(pv, cb, pTask);
1372	IPRT_LINUX_RESTORE_EFL_AC();
1373	return VERR_NO_MEMORY;
1374	}
1375
1376	pMemLnx->Core.u.ResVirt.R0Process = R0Process;
1377	*ppMem = &pMemLnx->Core;
1378	IPRT_LINUX_RESTORE_EFL_AC();
1379	return VINF_SUCCESS;
1380	}
1381
1382
1383	DECLHIDDEN(int) rtR0MemObjNativeMapKernel(PPRTR0MEMOBJINTERNAL ppMem, RTR0MEMOBJ pMemToMap,
1384	void *pvFixed, size_t uAlignment,
1385	unsigned fProt, size_t offSub, size_t cbSub)
1386	{
1387	int rc = VERR_NO_MEMORY;
1388	PRTR0MEMOBJLNX pMemLnxToMap = (PRTR0MEMOBJLNX)pMemToMap;
1389	PRTR0MEMOBJLNX pMemLnx;
1390	IPRT_LINUX_SAVE_EFL_AC();
1391
1392	/* Fail if requested to do something we can't. */
1393	AssertMsgReturn(!offSub && !cbSub, ("%#x %#x\n", offSub, cbSub), VERR_NOT_SUPPORTED);
1394	AssertMsgReturn(pvFixed == (void *)-1, ("%p\n", pvFixed), VERR_NOT_SUPPORTED);
1395	if (uAlignment > PAGE_SIZE)
1396	return VERR_NOT_SUPPORTED;
1397
1398	/*
1399	* Create the IPRT memory object.
1400	*/
1401	pMemLnx = (PRTR0MEMOBJLNX)rtR0MemObjNew(sizeof(*pMemLnx), RTR0MEMOBJTYPE_MAPPING, NULL, pMemLnxToMap->Core.cb);
1402	if (pMemLnx)
1403	{
1404	if (pMemLnxToMap->cPages)
1405	{
1406	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 22)
1407	/*
1408	* Use vmap - 2.4.22 and later.
1409	*/
1410	pgprot_t fPg = rtR0MemObjLinuxConvertProt(fProt, true /* kernel */);
1411	# ifdef VM_MAP
1412	pMemLnx->Core.pv = vmap(&pMemLnxToMap->apPages[0], pMemLnxToMap->cPages, VM_MAP, fPg);
1413	# else
1414	pMemLnx->Core.pv = vmap(&pMemLnxToMap->apPages[0], pMemLnxToMap->cPages, VM_ALLOC, fPg);
1415	# endif
1416	if (pMemLnx->Core.pv)
1417	{
1418	pMemLnx->fMappedToRing0 = true;
1419	rc = VINF_SUCCESS;
1420	}
1421	else
1422	rc = VERR_MAP_FAILED;
1423
1424	#else /* < 2.4.22 */
1425	/*
1426	* Only option here is to share mappings if possible and forget about fProt.
1427	*/
1428	if (rtR0MemObjIsRing3(pMemToMap))
1429	rc = VERR_NOT_SUPPORTED;
1430	else
1431	{
1432	rc = VINF_SUCCESS;
1433	if (!pMemLnxToMap->Core.pv)
1434	rc = rtR0MemObjLinuxVMap(pMemLnxToMap, !!(fProt & RTMEM_PROT_EXEC));
1435	if (RT_SUCCESS(rc))
1436	{
1437	Assert(pMemLnxToMap->Core.pv);
1438	pMemLnx->Core.pv = pMemLnxToMap->Core.pv;
1439	}
1440	}
1441	#endif
1442	}
1443	else
1444	{
1445	/*
1446	* MMIO / physical memory.
1447	*/
1448	Assert(pMemLnxToMap->Core.enmType == RTR0MEMOBJTYPE_PHYS && !pMemLnxToMap->Core.u.Phys.fAllocated);
1449	pMemLnx->Core.pv = pMemLnxToMap->Core.u.Phys.uCachePolicy == RTMEM_CACHE_POLICY_MMIO
1450	? ioremap_nocache(pMemLnxToMap->Core.u.Phys.PhysBase, pMemLnxToMap->Core.cb)
1451	: ioremap(pMemLnxToMap->Core.u.Phys.PhysBase, pMemLnxToMap->Core.cb);
1452	if (pMemLnx->Core.pv)
1453	{
1454	/** @todo fix protection. */
1455	rc = VINF_SUCCESS;
1456	}
1457	}
1458	if (RT_SUCCESS(rc))
1459	{
1460	pMemLnx->Core.u.Mapping.R0Process = NIL_RTR0PROCESS;
1461	*ppMem = &pMemLnx->Core;
1462	IPRT_LINUX_RESTORE_EFL_AC();
1463	return VINF_SUCCESS;
1464	}
1465	rtR0MemObjDelete(&pMemLnx->Core);
1466	}
1467
1468	IPRT_LINUX_RESTORE_EFL_AC();
1469	return rc;
1470	}
1471
1472
1473	#ifdef VBOX_USE_PAE_HACK
1474	/**
1475	* Replace the PFN of a PTE with the address of the actual page.
1476	*
1477	* The caller maps a reserved dummy page at the address with the desired access
1478	* and flags.
1479	*
1480	* This hack is required for older Linux kernels which don't provide
1481	* remap_pfn_range().
1482	*
1483	* @returns 0 on success, -ENOMEM on failure.
1484	* @param mm The memory context.
1485	* @param ulAddr The mapping address.
1486	* @param Phys The physical address of the page to map.
1487	*/
1488	static int rtR0MemObjLinuxFixPte(struct mm_struct *mm, unsigned long ulAddr, RTHCPHYS Phys)
1489	{
1490	int rc = -ENOMEM;
1491	pgd_t *pgd;
1492
1493	spin_lock(&mm->page_table_lock);
1494
1495	pgd = pgd_offset(mm, ulAddr);
1496	if (!pgd_none(pgd) && !pgd_bad(pgd))
1497	{
1498	pmd_t *pmd = pmd_offset(pgd, ulAddr);
1499	if (!pmd_none(*pmd))
1500	{
1501	pte_t *ptep = pte_offset_map(pmd, ulAddr);
1502	if (ptep)
1503	{
1504	pte_t pte = *ptep;
1505	pte.pte_high &= 0xfff00000;
1506	pte.pte_high \|= ((Phys >> 32) & 0x000fffff);
1507	pte.pte_low &= 0x00000fff;
1508	pte.pte_low \|= (Phys & 0xfffff000);
1509	set_pte(ptep, pte);
1510	pte_unmap(ptep);
1511	rc = 0;
1512	}
1513	}
1514	}
1515
1516	spin_unlock(&mm->page_table_lock);
1517	return rc;
1518	}
1519	#endif /* VBOX_USE_PAE_HACK */
1520
1521
1522	DECLHIDDEN(int) rtR0MemObjNativeMapUser(PPRTR0MEMOBJINTERNAL ppMem, RTR0MEMOBJ pMemToMap, RTR3PTR R3PtrFixed,
1523	size_t uAlignment, unsigned fProt, RTR0PROCESS R0Process)
1524	{
1525	struct task_struct *pTask = rtR0ProcessToLinuxTask(R0Process);
1526	PRTR0MEMOBJLNX pMemLnxToMap = (PRTR0MEMOBJLNX)pMemToMap;
1527	int rc = VERR_NO_MEMORY;
1528	PRTR0MEMOBJLNX pMemLnx;
1529	#ifdef VBOX_USE_PAE_HACK
1530	struct page *pDummyPage;
1531	RTHCPHYS DummyPhys;
1532	#endif
1533	IPRT_LINUX_SAVE_EFL_AC();
1534
1535	/*
1536	* Check for restrictions.
1537	*/
1538	if (!pTask)
1539	return VERR_NOT_SUPPORTED;
1540	if (uAlignment > PAGE_SIZE)
1541	return VERR_NOT_SUPPORTED;
1542
1543	#ifdef VBOX_USE_PAE_HACK
1544	/*
1545	* Allocate a dummy page for use when mapping the memory.
1546	*/
1547	pDummyPage = alloc_page(GFP_USER \| __GFP_NOWARN);
1548	if (!pDummyPage)
1549	{
1550	IPRT_LINUX_RESTORE_EFL_AC();
1551	return VERR_NO_MEMORY;
1552	}
1553	SetPageReserved(pDummyPage);
1554	DummyPhys = page_to_phys(pDummyPage);
1555	#endif
1556
1557	/*
1558	* Create the IPRT memory object.
1559	*/
1560	pMemLnx = (PRTR0MEMOBJLNX)rtR0MemObjNew(sizeof(*pMemLnx), RTR0MEMOBJTYPE_MAPPING, NULL, pMemLnxToMap->Core.cb);
1561	if (pMemLnx)
1562	{
1563	/*
1564	* Allocate user space mapping.
1565	*/
1566	void *pv;
1567	pv = rtR0MemObjLinuxDoMmap(R3PtrFixed, pMemLnxToMap->Core.cb, uAlignment, pTask, fProt);
1568	if (pv != (void *)-1)
1569	{
1570	/*
1571	* Map page by page into the mmap area.
1572	* This is generic, paranoid and not very efficient.
1573	*/
1574	pgprot_t fPg = rtR0MemObjLinuxConvertProt(fProt, false /* user */);
1575	unsigned long ulAddrCur = (unsigned long)pv;
1576	const size_t cPages = pMemLnxToMap->Core.cb >> PAGE_SHIFT;
1577	size_t iPage;
1578
1579	down_write(&pTask->mm->mmap_sem);
1580
1581	rc = VINF_SUCCESS;
1582	if (pMemLnxToMap->cPages)
1583	{
1584	for (iPage = 0; iPage < cPages; iPage++, ulAddrCur += PAGE_SIZE)
1585	{
1586	#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 11)
1587	RTHCPHYS Phys = page_to_phys(pMemLnxToMap->apPages[iPage]);
1588	#endif
1589	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0) \|\| defined(HAVE_26_STYLE_REMAP_PAGE_RANGE)
1590	struct vm_area_struct vma = find_vma(pTask->mm, ulAddrCur); / this is probably the same for all the pages... */
1591	AssertBreakStmt(vma, rc = VERR_INTERNAL_ERROR);
1592	#endif
1593	#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0) && defined(RT_ARCH_X86)
1594	/* remap_page_range() limitation on x86 */
1595	AssertBreakStmt(Phys < _4G, rc = VERR_NO_MEMORY);
1596	#endif
1597
1598	#if defined(VBOX_USE_INSERT_PAGE) && LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 22)
1599	rc = vm_insert_page(vma, ulAddrCur, pMemLnxToMap->apPages[iPage]);
1600	/* Thes flags help making 100% sure some bad stuff wont happen (swap, core, ++).
1601	* See remap_pfn_range() in mm/memory.c */
1602	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 7, 0)
1603	vma->vm_flags \|= VM_DONTEXPAND \| VM_DONTDUMP;
1604	#else
1605	vma->vm_flags \|= VM_RESERVED;
1606	#endif
1607	#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 11)
1608	rc = remap_pfn_range(vma, ulAddrCur, page_to_pfn(pMemLnxToMap->apPages[iPage]), PAGE_SIZE, fPg);
1609	#elif defined(VBOX_USE_PAE_HACK)
1610	rc = remap_page_range(vma, ulAddrCur, DummyPhys, PAGE_SIZE, fPg);
1611	if (!rc)
1612	rc = rtR0MemObjLinuxFixPte(pTask->mm, ulAddrCur, Phys);
1613	#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0) \|\| defined(HAVE_26_STYLE_REMAP_PAGE_RANGE)
1614	rc = remap_page_range(vma, ulAddrCur, Phys, PAGE_SIZE, fPg);
1615	#else /* 2.4 */
1616	rc = remap_page_range(ulAddrCur, Phys, PAGE_SIZE, fPg);
1617	#endif
1618	if (rc)
1619	{
1620	rc = VERR_NO_MEMORY;
1621	break;
1622	}
1623	}
1624	}
1625	else
1626	{
1627	RTHCPHYS Phys;
1628	if (pMemLnxToMap->Core.enmType == RTR0MEMOBJTYPE_PHYS)
1629	Phys = pMemLnxToMap->Core.u.Phys.PhysBase;
1630	else if (pMemLnxToMap->Core.enmType == RTR0MEMOBJTYPE_CONT)
1631	Phys = pMemLnxToMap->Core.u.Cont.Phys;
1632	else
1633	{
1634	AssertMsgFailed(("%d\n", pMemLnxToMap->Core.enmType));
1635	Phys = NIL_RTHCPHYS;
1636	}
1637	if (Phys != NIL_RTHCPHYS)
1638	{
1639	for (iPage = 0; iPage < cPages; iPage++, ulAddrCur += PAGE_SIZE, Phys += PAGE_SIZE)
1640	{
1641	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0) \|\| defined(HAVE_26_STYLE_REMAP_PAGE_RANGE)
1642	struct vm_area_struct vma = find_vma(pTask->mm, ulAddrCur); / this is probably the same for all the pages... */
1643	AssertBreakStmt(vma, rc = VERR_INTERNAL_ERROR);
1644	#endif
1645	#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0) && defined(RT_ARCH_X86)
1646	/* remap_page_range() limitation on x86 */
1647	AssertBreakStmt(Phys < _4G, rc = VERR_NO_MEMORY);
1648	#endif
1649
1650	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 11)
1651	rc = remap_pfn_range(vma, ulAddrCur, Phys, PAGE_SIZE, fPg);
1652	#elif defined(VBOX_USE_PAE_HACK)
1653	rc = remap_page_range(vma, ulAddrCur, DummyPhys, PAGE_SIZE, fPg);
1654	if (!rc)
1655	rc = rtR0MemObjLinuxFixPte(pTask->mm, ulAddrCur, Phys);
1656	#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0) \|\| defined(HAVE_26_STYLE_REMAP_PAGE_RANGE)
1657	rc = remap_page_range(vma, ulAddrCur, Phys, PAGE_SIZE, fPg);
1658	#else /* 2.4 */
1659	rc = remap_page_range(ulAddrCur, Phys, PAGE_SIZE, fPg);
1660	#endif
1661	if (rc)
1662	{
1663	rc = VERR_NO_MEMORY;
1664	break;
1665	}
1666	}
1667	}
1668	}
1669
1670	#ifdef CONFIG_NUMA_BALANCING
1671	# if LINUX_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
1672	# ifdef RHEL_RELEASE_CODE
1673	# if RHEL_RELEASE_CODE < RHEL_RELEASE_VERSION(7, 0)
1674	# define VBOX_NUMA_HACK_OLD
1675	# endif
1676	# endif
1677	# endif
1678	if (RT_SUCCESS(rc))
1679	{
1680	/** @todo Ugly hack! But right now we have no other means to
1681	* disable automatic NUMA page balancing. */
1682	# ifdef RT_OS_X86
1683	# ifdef VBOX_NUMA_HACK_OLD
1684	pTask->mm->numa_next_reset = jiffies + 0x7fffffffUL;
1685	# endif
1686	pTask->mm->numa_next_scan = jiffies + 0x7fffffffUL;
1687	# else
1688	# ifdef VBOX_NUMA_HACK_OLD
1689	pTask->mm->numa_next_reset = jiffies + 0x7fffffffffffffffUL;
1690	# endif
1691	pTask->mm->numa_next_scan = jiffies + 0x7fffffffffffffffUL;
1692	# endif
1693	}
1694	#endif /* CONFIG_NUMA_BALANCING */
1695
1696	up_write(&pTask->mm->mmap_sem);
1697
1698	if (RT_SUCCESS(rc))
1699	{
1700	#ifdef VBOX_USE_PAE_HACK
1701	__free_page(pDummyPage);
1702	#endif
1703	pMemLnx->Core.pv = pv;
1704	pMemLnx->Core.u.Mapping.R0Process = R0Process;
1705	*ppMem = &pMemLnx->Core;
1706	IPRT_LINUX_RESTORE_EFL_AC();
1707	return VINF_SUCCESS;
1708	}
1709
1710	/*
1711	* Bail out.
1712	*/
1713	rtR0MemObjLinuxDoMunmap(pv, pMemLnxToMap->Core.cb, pTask);
1714	}
1715	rtR0MemObjDelete(&pMemLnx->Core);
1716	}
1717	#ifdef VBOX_USE_PAE_HACK
1718	__free_page(pDummyPage);
1719	#endif
1720
1721	IPRT_LINUX_RESTORE_EFL_AC();
1722	return rc;
1723	}
1724
1725
1726	DECLHIDDEN(int) rtR0MemObjNativeProtect(PRTR0MEMOBJINTERNAL pMem, size_t offSub, size_t cbSub, uint32_t fProt)
1727	{
1728	NOREF(pMem);
1729	NOREF(offSub);
1730	NOREF(cbSub);
1731	NOREF(fProt);
1732	return VERR_NOT_SUPPORTED;
1733	}
1734
1735
1736	DECLHIDDEN(RTHCPHYS) rtR0MemObjNativeGetPagePhysAddr(PRTR0MEMOBJINTERNAL pMem, size_t iPage)
1737	{
1738	PRTR0MEMOBJLNX pMemLnx = (PRTR0MEMOBJLNX)pMem;
1739
1740	if (pMemLnx->cPages)
1741	return page_to_phys(pMemLnx->apPages[iPage]);
1742
1743	switch (pMemLnx->Core.enmType)
1744	{
1745	case RTR0MEMOBJTYPE_CONT:
1746	return pMemLnx->Core.u.Cont.Phys + (iPage << PAGE_SHIFT);
1747
1748	case RTR0MEMOBJTYPE_PHYS:
1749	return pMemLnx->Core.u.Phys.PhysBase + (iPage << PAGE_SHIFT);
1750
1751	/* the parent knows */
1752	case RTR0MEMOBJTYPE_MAPPING:
1753	return rtR0MemObjNativeGetPagePhysAddr(pMemLnx->Core.uRel.Child.pParent, iPage);
1754
1755	/* cPages > 0 */
1756	case RTR0MEMOBJTYPE_LOW:
1757	case RTR0MEMOBJTYPE_LOCK:
1758	case RTR0MEMOBJTYPE_PHYS_NC:
1759	case RTR0MEMOBJTYPE_PAGE:
1760	default:
1761	AssertMsgFailed(("%d\n", pMemLnx->Core.enmType));
1762	/* fall thru */
1763
1764	case RTR0MEMOBJTYPE_RES_VIRT:
1765	return NIL_RTHCPHYS;
1766	}
1767	}
1768

Note: See TracBrowser for help on using the repository browser.

source: vbox/trunk/src/VBox/Runtime/r0drv/linux/memobj-r0drv-linux.c@ 76734

Download in other formats: