[mirror_ubuntu-bionic-kernel.git] / arch / x86 / include / asm / xen / page.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_XEN_PAGE_H
#define _ASM_X86_XEN_PAGE_H

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/pfn.h>
#include <linux/mm.h>
#include <linux/device.h>

#include <linux/uaccess.h>
#include <asm/page.h>
#include <asm/pgtable.h>

#include <xen/interface/xen.h>
#include <xen/interface/grant_table.h>
#include <xen/features.h>

/* Xen machine address */
typedef struct xmaddr {
	phys_addr_t maddr;
} xmaddr_t;

/* Xen pseudo-physical address */
typedef struct xpaddr {
	phys_addr_t paddr;
} xpaddr_t;

#ifdef CONFIG_X86_64
#define XEN_PHYSICAL_MASK	__sme_clr((1UL << 52) - 1)
#else
#define XEN_PHYSICAL_MASK	__PHYSICAL_MASK
#endif

#define XEN_PTE_MFN_MASK	((pteval_t)(((signed long)PAGE_MASK) & \
					    XEN_PHYSICAL_MASK))

#define XMADDR(x)	((xmaddr_t) { .maddr = (x) })
#define XPADDR(x)	((xpaddr_t) { .paddr = (x) })

/**** MACHINE <-> PHYSICAL CONVERSION MACROS ****/
#define INVALID_P2M_ENTRY	(~0UL)
#define FOREIGN_FRAME_BIT	(1UL<<(BITS_PER_LONG-1))
#define IDENTITY_FRAME_BIT	(1UL<<(BITS_PER_LONG-2))
#define FOREIGN_FRAME(m)	((m) | FOREIGN_FRAME_BIT)
#define IDENTITY_FRAME(m)	((m) | IDENTITY_FRAME_BIT)

#define P2M_PER_PAGE		(PAGE_SIZE / sizeof(unsigned long))

extern unsigned long *machine_to_phys_mapping;
extern unsigned long  machine_to_phys_nr;
extern unsigned long *xen_p2m_addr;
extern unsigned long  xen_p2m_size;
extern unsigned long  xen_max_p2m_pfn;

extern int xen_alloc_p2m_entry(unsigned long pfn);

extern unsigned long get_phys_to_machine(unsigned long pfn);
extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn);
extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
extern unsigned long __init set_phys_range_identity(unsigned long pfn_s,
						    unsigned long pfn_e);

#ifdef CONFIG_XEN_PV
extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
				   struct gnttab_map_grant_ref *kmap_ops,
				   struct page **pages, unsigned int count);
extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
				     struct gnttab_unmap_grant_ref *kunmap_ops,
				     struct page **pages, unsigned int count);
#else
static inline int
set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
			struct gnttab_map_grant_ref *kmap_ops,
			struct page **pages, unsigned int count)
{
	return 0;
}

static inline int
clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
			  struct gnttab_unmap_grant_ref *kunmap_ops,
			  struct page **pages, unsigned int count)
{
	return 0;
}
#endif

/*
 * Helper functions to write or read unsigned long values to/from
 * memory, when the access may fault.
 */
static inline int xen_safe_write_ulong(unsigned long *addr, unsigned long val)
{
	return __put_user(val, (unsigned long __user *)addr);
}

static inline int xen_safe_read_ulong(unsigned long *addr, unsigned long *val)
{
	return __get_user(*val, (unsigned long __user *)addr);
}

#ifdef CONFIG_XEN_PV
/*
 * When to use pfn_to_mfn(), __pfn_to_mfn() or get_phys_to_machine():
 * - pfn_to_mfn() returns either INVALID_P2M_ENTRY or the mfn. No indicator
 *   bits (identity or foreign) are set.
 * - __pfn_to_mfn() returns the found entry of the p2m table. A possibly set
 *   identity or foreign indicator will be still set. __pfn_to_mfn() is
 *   encapsulating get_phys_to_machine() which is called in special cases only.
 * - get_phys_to_machine() is to be called by __pfn_to_mfn() only in special
 *   cases needing an extended handling.
 */
static inline unsigned long __pfn_to_mfn(unsigned long pfn)
{
	unsigned long mfn;

	if (pfn < xen_p2m_size)
		mfn = xen_p2m_addr[pfn];
	else if (unlikely(pfn < xen_max_p2m_pfn))
		return get_phys_to_machine(pfn);
	else
		return IDENTITY_FRAME(pfn);

	if (unlikely(mfn == INVALID_P2M_ENTRY))
		return get_phys_to_machine(pfn);

	return mfn;
}
#else
static inline unsigned long __pfn_to_mfn(unsigned long pfn)
{
	return pfn;
}
#endif

static inline unsigned long pfn_to_mfn(unsigned long pfn)
{
	unsigned long mfn;

	/*
	 * Some x86 code are still using pfn_to_mfn instead of
	 * pfn_to_mfn. This will have to be removed when we figured
	 * out which call.
	 */
	if (xen_feature(XENFEAT_auto_translated_physmap))
		return pfn;

	mfn = __pfn_to_mfn(pfn);

	if (mfn != INVALID_P2M_ENTRY)
		mfn &= ~(FOREIGN_FRAME_BIT | IDENTITY_FRAME_BIT);

	return mfn;
}

static inline int phys_to_machine_mapping_valid(unsigned long pfn)
{
	if (xen_feature(XENFEAT_auto_translated_physmap))
		return 1;

	return __pfn_to_mfn(pfn) != INVALID_P2M_ENTRY;
}

static inline unsigned long mfn_to_pfn_no_overrides(unsigned long mfn)
{
	unsigned long pfn;
	int ret;

	if (unlikely(mfn >= machine_to_phys_nr))
		return ~0;

	/*
	 * The array access can fail (e.g., device space beyond end of RAM).
	 * In such cases it doesn't matter what we return (we return garbage),
	 * but we must handle the fault without crashing!
	 */
	ret = xen_safe_read_ulong(&machine_to_phys_mapping[mfn], &pfn);
	if (ret < 0)
		return ~0;

	return pfn;
}

static inline unsigned long mfn_to_pfn(unsigned long mfn)
{
	unsigned long pfn;

	/*
	 * Some x86 code are still using mfn_to_pfn instead of
	 * gfn_to_pfn. This will have to be removed when we figure
	 * out which call.
	 */
	if (xen_feature(XENFEAT_auto_translated_physmap))
		return mfn;

	pfn = mfn_to_pfn_no_overrides(mfn);
	if (__pfn_to_mfn(pfn) != mfn)
		pfn = ~0;

	/*
	 * pfn is ~0 if there are no entries in the m2p for mfn or the
	 * entry doesn't map back to the mfn.
	 */
	if (pfn == ~0 && __pfn_to_mfn(mfn) == IDENTITY_FRAME(mfn))
		pfn = mfn;

	return pfn;
}

static inline xmaddr_t phys_to_machine(xpaddr_t phys)
{
	unsigned offset = phys.paddr & ~PAGE_MASK;
	return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset);
}

static inline xpaddr_t machine_to_phys(xmaddr_t machine)
{
	unsigned offset = machine.maddr & ~PAGE_MASK;
	return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset);
}

/* Pseudo-physical <-> Guest conversion */
static inline unsigned long pfn_to_gfn(unsigned long pfn)
{
	if (xen_feature(XENFEAT_auto_translated_physmap))
		return pfn;
	else
		return pfn_to_mfn(pfn);
}

static inline unsigned long gfn_to_pfn(unsigned long gfn)
{
	if (xen_feature(XENFEAT_auto_translated_physmap))
		return gfn;
	else
		return mfn_to_pfn(gfn);
}

/* Pseudo-physical <-> Bus conversion */
#define pfn_to_bfn(pfn)		pfn_to_gfn(pfn)
#define bfn_to_pfn(bfn)		gfn_to_pfn(bfn)

/*
 * We detect special mappings in one of two ways:
 *  1. If the MFN is an I/O page then Xen will set the m2p entry
 *     to be outside our maximum possible pseudophys range.
 *  2. If the MFN belongs to a different domain then we will certainly
 *     not have MFN in our p2m table. Conversely, if the page is ours,
 *     then we'll have p2m(m2p(MFN))==MFN.
 * If we detect a special mapping then it doesn't have a 'struct page'.
 * We force !pfn_valid() by returning an out-of-range pointer.
 *
 * NB. These checks require that, for any MFN that is not in our reservation,
 * there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if
 * we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN.
 * Yikes! Various places must poke in INVALID_P2M_ENTRY for safety.
 *
 * NB2. When deliberately mapping foreign pages into the p2m table, you *must*
 *      use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we
 *      require. In all the cases we care about, the FOREIGN_FRAME bit is
 *      masked (e.g., pfn_to_mfn()) so behaviour there is correct.
 */
static inline unsigned long bfn_to_local_pfn(unsigned long mfn)
{
	unsigned long pfn;

	if (xen_feature(XENFEAT_auto_translated_physmap))
		return mfn;

	pfn = mfn_to_pfn(mfn);
	if (__pfn_to_mfn(pfn) != mfn)
		return -1; /* force !pfn_valid() */
	return pfn;
}

/* VIRT <-> MACHINE conversion */
#define virt_to_machine(v)	(phys_to_machine(XPADDR(__pa(v))))
#define virt_to_pfn(v)          (PFN_DOWN(__pa(v)))
#define virt_to_mfn(v)		(pfn_to_mfn(virt_to_pfn(v)))
#define mfn_to_virt(m)		(__va(mfn_to_pfn(m) << PAGE_SHIFT))

/* VIRT <-> GUEST conversion */
#define virt_to_gfn(v)		(pfn_to_gfn(virt_to_pfn(v)))
#define gfn_to_virt(g)		(__va(gfn_to_pfn(g) << PAGE_SHIFT))

static inline unsigned long pte_mfn(pte_t pte)
{
	return (pte.pte & XEN_PTE_MFN_MASK) >> PAGE_SHIFT;
}

static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot)
{
	pte_t pte;

	pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) |
			massage_pgprot(pgprot);

	return pte;
}

static inline pteval_t pte_val_ma(pte_t pte)
{
	return pte.pte;
}

static inline pte_t __pte_ma(pteval_t x)
{
	return (pte_t) { .pte = x };
}

#define pmd_val_ma(v) ((v).pmd)
#ifdef __PAGETABLE_PUD_FOLDED
#define pud_val_ma(v) ((v).p4d.pgd.pgd)
#else
#define pud_val_ma(v) ((v).pud)
#endif
#define __pmd_ma(x)	((pmd_t) { (x) } )

#ifdef __PAGETABLE_P4D_FOLDED
#define p4d_val_ma(x)	((x).pgd.pgd)
#else
#define p4d_val_ma(x)	((x).p4d)
#endif

xmaddr_t arbitrary_virt_to_machine(void *address);
unsigned long arbitrary_virt_to_mfn(void *vaddr);
void make_lowmem_page_readonly(void *vaddr);
void make_lowmem_page_readwrite(void *vaddr);

#define xen_remap(cookie, size) ioremap((cookie), (size));
#define xen_unmap(cookie) iounmap((cookie))

static inline bool xen_arch_need_swiotlb(struct device *dev,
					 phys_addr_t phys,
					 dma_addr_t dev_addr)
{
	return false;
}

static inline unsigned long xen_get_swiotlb_free_pages(unsigned int order)
{
	return __get_free_pages(__GFP_NOWARN, order);
}

#endif /* _ASM_X86_XEN_PAGE_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
05e4d316 PA	2	#ifndef _ASM_X86_XEN_PAGE_H
05e4d316 PA	3	#define _ASM_X86_XEN_PAGE_H
20e71f2e	4
ecbf29cd JF	5	#include <linux/kernel.h>
	6	#include <linux/types.h>
	7	#include <linux/spinlock.h>
20e71f2e	8	#include <linux/pfn.h>
7e77506a	9	#include <linux/mm.h>
7fd5cf0b	10	#include <linux/device.h>
20e71f2e	11
7c0f6ba6	12	#include <linux/uaccess.h>
ecbf29cd	13	#include <asm/page.h>
20e71f2e IY	14	#include <asm/pgtable.h>
20e71f2e IY	15
ecbf29cd	16	#include <xen/interface/xen.h>
008c320a	17	#include <xen/interface/grant_table.h>
20e71f2e IY	18	#include <xen/features.h>
	19
	20	/* Xen machine address */
	21	typedef struct xmaddr {
	22	phys_addr_t maddr;
	23	} xmaddr_t;
	24
	25	/* Xen pseudo-physical address */
	26	typedef struct xpaddr {
	27	phys_addr_t paddr;
	28	} xpaddr_t;
	29
6f0e8bf1 JG	30	#ifdef CONFIG_X86_64
	31	#define XEN_PHYSICAL_MASK __sme_clr((1UL << 52) - 1)
	32	#else
	33	#define XEN_PHYSICAL_MASK __PHYSICAL_MASK
	34	#endif
	35
	36	#define XEN_PTE_MFN_MASK ((pteval_t)(((signed long)PAGE_MASK) & \
	37	XEN_PHYSICAL_MASK))
	38
20e71f2e IY	39	#define XMADDR(x) ((xmaddr_t) { .maddr = (x) })
	40	#define XPADDR(x) ((xpaddr_t) { .paddr = (x) })
	41
	42	/** MACHINE <-> PHYSICAL CONVERSION MACROS **/
	43	#define INVALID_P2M_ENTRY (~0UL)
f4cec35b KRW	44	#define FOREIGN_FRAME_BIT (1UL<<(BITS_PER_LONG-1))
f4cec35b KRW	45	#define IDENTITY_FRAME_BIT (1UL<<(BITS_PER_LONG-2))
20e71f2e	46	#define FOREIGN_FRAME(m) ((m) \| FOREIGN_FRAME_BIT)
f4cec35b	47	#define IDENTITY_FRAME(m) ((m) \| IDENTITY_FRAME_BIT)
20e71f2e	48
cb3eb850 JG	49	#define P2M_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
cb3eb850 JG	50
7e77506a	51	extern unsigned long *machine_to_phys_mapping;
ccbcdf7c	52	extern unsigned long machine_to_phys_nr;
5b8e7d80 JG	53	extern unsigned long *xen_p2m_addr;
	54	extern unsigned long xen_p2m_size;
	55	extern unsigned long xen_max_p2m_pfn;
8006ec3e	56
8edfcf88 DV	57	extern int xen_alloc_p2m_entry(unsigned long pfn);
8edfcf88 DV	58
d451bb7a	59	extern unsigned long get_phys_to_machine(unsigned long pfn);
c3798062	60	extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn);
6eaa412f	61	extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
cb3eb850 JG	62	extern unsigned long __init set_phys_range_identity(unsigned long pfn_s,
cb3eb850 JG	63	unsigned long pfn_e);
20e71f2e	64
3d4ebdb2	65	#ifdef CONFIG_XEN_PV
1429d46d ZK	66	extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
	67	struct gnttab_map_grant_ref *kmap_ops,
	68	struct page **pages, unsigned int count);
1429d46d	69	extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
853d0289	70	struct gnttab_unmap_grant_ref *kunmap_ops,
1429d46d	71	struct page **pages, unsigned int count);
3d4ebdb2 VK	72	#else
	73	static inline int
	74	set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
	75	struct gnttab_map_grant_ref *kmap_ops,
	76	struct page **pages, unsigned int count)
	77	{
	78	return 0;
	79	}
	80
	81	static inline int
	82	clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
	83	struct gnttab_unmap_grant_ref *kunmap_ops,
	84	struct page **pages, unsigned int count)
	85	{
	86	return 0;
	87	}
	88	#endif
448f2831	89
90fff3ea JG	90	/*
	91	* Helper functions to write or read unsigned long values to/from
	92	* memory, when the access may fault.
	93	*/
	94	static inline int xen_safe_write_ulong(unsigned long *addr, unsigned long val)
	95	{
	96	return __put_user(val, (unsigned long __user *)addr);
	97	}
	98
	99	static inline int xen_safe_read_ulong(unsigned long addr, unsigned long val)
	100	{
	101	return __get_user(val, (unsigned long __user )addr);
	102	}
	103
3d4ebdb2	104	#ifdef CONFIG_XEN_PV
0aad5689 JG	105	/*
	106	* When to use pfn_to_mfn(), __pfn_to_mfn() or get_phys_to_machine():
	107	* - pfn_to_mfn() returns either INVALID_P2M_ENTRY or the mfn. No indicator
	108	* bits (identity or foreign) are set.
	109	* - __pfn_to_mfn() returns the found entry of the p2m table. A possibly set
	110	* identity or foreign indicator will be still set. __pfn_to_mfn() is
054954eb JG	111	* encapsulating get_phys_to_machine() which is called in special cases only.
	112	* - get_phys_to_machine() is to be called by __pfn_to_mfn() only in special
	113	* cases needing an extended handling.
0aad5689 JG	114	*/
	115	static inline unsigned long __pfn_to_mfn(unsigned long pfn)
	116	{
054954eb JG	117	unsigned long mfn;
	118
	119	if (pfn < xen_p2m_size)
	120	mfn = xen_p2m_addr[pfn];
	121	else if (unlikely(pfn < xen_max_p2m_pfn))
	122	return get_phys_to_machine(pfn);
	123	else
	124	return IDENTITY_FRAME(pfn);
	125
	126	if (unlikely(mfn == INVALID_P2M_ENTRY))
	127	return get_phys_to_machine(pfn);
	128
	129	return mfn;
0aad5689	130	}
3d4ebdb2 VK	131	#else
	132	static inline unsigned long __pfn_to_mfn(unsigned long pfn)
	133	{
	134	return pfn;
	135	}
	136	#endif
0aad5689	137
20e71f2e IY	138	static inline unsigned long pfn_to_mfn(unsigned long pfn)
20e71f2e IY	139	{
cfd8951e JF	140	unsigned long mfn;
cfd8951e JF	141
0df4f266 JG	142	/*
	143	* Some x86 code are still using pfn_to_mfn instead of
	144	* pfn_to_mfn. This will have to be removed when we figured
	145	* out which call.
	146	*/
20e71f2e IY	147	if (xen_feature(XENFEAT_auto_translated_physmap))
	148	return pfn;
	149
0aad5689	150	mfn = __pfn_to_mfn(pfn);
cfd8951e JF	151
cfd8951e JF	152	if (mfn != INVALID_P2M_ENTRY)
f4cec35b	153	mfn &= ~(FOREIGN_FRAME_BIT \| IDENTITY_FRAME_BIT);
cfd8951e JF	154
cfd8951e JF	155	return mfn;
20e71f2e IY	156	}
	157
	158	static inline int phys_to_machine_mapping_valid(unsigned long pfn)
	159	{
	160	if (xen_feature(XENFEAT_auto_translated_physmap))
	161	return 1;
	162
0aad5689	163	return __pfn_to_mfn(pfn) != INVALID_P2M_ENTRY;
20e71f2e IY	164	}
20e71f2e IY	165
0160676b	166	static inline unsigned long mfn_to_pfn_no_overrides(unsigned long mfn)
20e71f2e IY	167	{
20e71f2e IY	168	unsigned long pfn;
0160676b	169	int ret;
20e71f2e	170
0160676b DV	171	if (unlikely(mfn >= machine_to_phys_nr))
	172	return ~0;
	173
20e71f2e IY	174	/*
	175	* The array access can fail (e.g., device space beyond end of RAM).
	176	* In such cases it doesn't matter what we return (we return garbage),
	177	* but we must handle the fault without crashing!
	178	*/
90fff3ea	179	ret = xen_safe_read_ulong(&machine_to_phys_mapping[mfn], &pfn);
706cc9d2	180	if (ret < 0)
0160676b DV	181	return ~0;
	182
	183	return pfn;
	184	}
	185
	186	static inline unsigned long mfn_to_pfn(unsigned long mfn)
	187	{
	188	unsigned long pfn;
	189
0df4f266 JG	190	/*
	191	* Some x86 code are still using mfn_to_pfn instead of
	192	* gfn_to_pfn. This will have to be removed when we figure
	193	* out which call.
	194	*/
0160676b DV	195	if (xen_feature(XENFEAT_auto_translated_physmap))
	196	return mfn;
	197
	198	pfn = mfn_to_pfn_no_overrides(mfn);
0bb599fd DV	199	if (__pfn_to_mfn(pfn) != mfn)
0bb599fd DV	200	pfn = ~0;
706cc9d2	201
1429d46d	202	/*
0bb599fd DV	203	* pfn is ~0 if there are no entries in the m2p for mfn or the
0bb599fd DV	204	* entry doesn't map back to the mfn.
448f2831	205	*/
0aad5689	206	if (pfn == ~0 && __pfn_to_mfn(mfn) == IDENTITY_FRAME(mfn))
706cc9d2	207	pfn = mfn;
448f2831	208
20e71f2e IY	209	return pfn;
	210	}
	211
	212	static inline xmaddr_t phys_to_machine(xpaddr_t phys)
	213	{
	214	unsigned offset = phys.paddr & ~PAGE_MASK;
947d0496	215	return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) \| offset);
20e71f2e IY	216	}
	217
	218	static inline xpaddr_t machine_to_phys(xmaddr_t machine)
	219	{
	220	unsigned offset = machine.maddr & ~PAGE_MASK;
947d0496	221	return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) \| offset);
20e71f2e IY	222	}
20e71f2e IY	223
0df4f266 JG	224	/* Pseudo-physical <-> Guest conversion */
	225	static inline unsigned long pfn_to_gfn(unsigned long pfn)
	226	{
	227	if (xen_feature(XENFEAT_auto_translated_physmap))
	228	return pfn;
	229	else
	230	return pfn_to_mfn(pfn);
	231	}
	232
	233	static inline unsigned long gfn_to_pfn(unsigned long gfn)
	234	{
	235	if (xen_feature(XENFEAT_auto_translated_physmap))
	236	return gfn;
	237	else
	238	return mfn_to_pfn(gfn);
	239	}
	240
32e09870	241	/* Pseudo-physical <-> Bus conversion */
0df4f266 JG	242	#define pfn_to_bfn(pfn) pfn_to_gfn(pfn)
0df4f266 JG	243	#define bfn_to_pfn(bfn) gfn_to_pfn(bfn)
32e09870	244
20e71f2e IY	245	/*
	246	* We detect special mappings in one of two ways:
	247	* 1. If the MFN is an I/O page then Xen will set the m2p entry
	248	* to be outside our maximum possible pseudophys range.
	249	* 2. If the MFN belongs to a different domain then we will certainly
	250	* not have MFN in our p2m table. Conversely, if the page is ours,
	251	* then we'll have p2m(m2p(MFN))==MFN.
	252	* If we detect a special mapping then it doesn't have a 'struct page'.
	253	* We force !pfn_valid() by returning an out-of-range pointer.
	254	*
	255	* NB. These checks require that, for any MFN that is not in our reservation,
	256	* there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if
	257	* we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN.
	258	* Yikes! Various places must poke in INVALID_P2M_ENTRY for safety.
	259	*
	260	* NB2. When deliberately mapping foreign pages into the p2m table, you must
	261	* use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we
	262	* require. In all the cases we care about, the FOREIGN_FRAME bit is
	263	* masked (e.g., pfn_to_mfn()) so behaviour there is correct.
	264	*/
32e09870	265	static inline unsigned long bfn_to_local_pfn(unsigned long mfn)
20e71f2e	266	{
fc590efe MR	267	unsigned long pfn;
	268
	269	if (xen_feature(XENFEAT_auto_translated_physmap))
	270	return mfn;
	271
	272	pfn = mfn_to_pfn(mfn);
0aad5689	273	if (__pfn_to_mfn(pfn) != mfn)
c0011dbf	274	return -1; /* force !pfn_valid() */
20e71f2e IY	275	return pfn;
	276	}
	277
20e71f2e IY	278	/* VIRT <-> MACHINE conversion */
20e71f2e IY	279	#define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v))))
b40bf53e AN	280	#define virt_to_pfn(v) (PFN_DOWN(__pa(v)))
b40bf53e AN	281	#define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v)))
20e71f2e IY	282	#define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT))
20e71f2e IY	283
0df4f266 JG	284	/* VIRT <-> GUEST conversion */
	285	#define virt_to_gfn(v) (pfn_to_gfn(virt_to_pfn(v)))
	286	#define gfn_to_virt(g) (__va(gfn_to_pfn(g) << PAGE_SHIFT))
	287
20e71f2e IY	288	static inline unsigned long pte_mfn(pte_t pte)
20e71f2e IY	289	{
6f0e8bf1	290	return (pte.pte & XEN_PTE_MFN_MASK) >> PAGE_SHIFT;
20e71f2e IY	291	}
	292
	293	static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot)
	294	{
	295	pte_t pte;
	296
	297	pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) \|
b534816b	298	massage_pgprot(pgprot);
20e71f2e IY	299
	300	return pte;
	301	}
	302
	303	static inline pteval_t pte_val_ma(pte_t pte)
	304	{
	305	return pte.pte;
	306	}
	307
	308	static inline pte_t __pte_ma(pteval_t x)
	309	{
	310	return (pte_t) { .pte = x };
	311	}
	312
20e71f2e	313	#define pmd_val_ma(v) ((v).pmd)
f6e58732	314	#ifdef __PAGETABLE_PUD_FOLDED
f2a6a705	315	#define pud_val_ma(v) ((v).p4d.pgd.pgd)
f6e58732 JF	316	#else
	317	#define pud_val_ma(v) ((v).pud)
	318	#endif
20e71f2e	319	#define __pmd_ma(x) ((pmd_t) { (x) } )
20e71f2e	320
f2a6a705 KS	321	#ifdef __PAGETABLE_P4D_FOLDED
	322	#define p4d_val_ma(x) ((x).pgd.pgd)
	323	#else
	324	#define p4d_val_ma(x) ((x).p4d)
	325	#endif
20e71f2e	326
ce803e70	327	xmaddr_t arbitrary_virt_to_machine(void *address);
9976b39b	328	unsigned long arbitrary_virt_to_mfn(void *vaddr);
20e71f2e IY	329	void make_lowmem_page_readonly(void *vaddr);
	330	void make_lowmem_page_readwrite(void *vaddr);
	331
3216dceb	332	#define xen_remap(cookie, size) ioremap((cookie), (size));
efaf30a3	333	#define xen_unmap(cookie) iounmap((cookie))
3216dceb	334
a4dba130	335	static inline bool xen_arch_need_swiotlb(struct device *dev,
291be10f JG	336	phys_addr_t phys,
291be10f JG	337	dma_addr_t dev_addr)
a4dba130 SS	338	{
	339	return false;
	340	}
	341
8746515d SS	342	static inline unsigned long xen_get_swiotlb_free_pages(unsigned int order)
	343	{
	344	return __get_free_pages(__GFP_NOWARN, order);
	345	}
	346
05e4d316	347	#endif /* _ASM_X86_XEN_PAGE_H */