[linux-2.6-block.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 <asm/extable.h>
#include <asm/page.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)
{
	int ret = 0;

	asm volatile("1: mov %[val], %[ptr]\n"
		     "2:\n"
		     _ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_EFAULT_REG, %[ret])
		     : [ret] "+r" (ret), [ptr] "=m" (*addr)
		     : [val] "r" (val));

	return ret;
}

static inline int xen_safe_read_ulong(const unsigned long *addr,
				      unsigned long *val)
{
	unsigned long rval = ~0ul;
	int ret = 0;

	asm volatile("1: mov %[ptr], %[rval]\n"
		     "2:\n"
		     _ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_EFAULT_REG, %[ret])
		     : [ret] "+r" (ret), [rval] "+r" (rval)
		     : [ptr] "m" (*addr));
	*val = rval;

	return ret;
}

#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))))
static inline unsigned long virt_to_pfn(const void *v)
{
	return 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);

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

#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
1457d8cf	12	#include <asm/extable.h>
ecbf29cd	13	#include <asm/page.h>
20e71f2e	14
ecbf29cd	15	#include <xen/interface/xen.h>
008c320a	16	#include <xen/interface/grant_table.h>
20e71f2e IY	17	#include <xen/features.h>
	18
	19	/* Xen machine address */
	20	typedef struct xmaddr {
	21	phys_addr_t maddr;
	22	} xmaddr_t;
	23
	24	/* Xen pseudo-physical address */
	25	typedef struct xpaddr {
	26	phys_addr_t paddr;
	27	} xpaddr_t;
	28
6f0e8bf1 JG	29	#ifdef CONFIG_X86_64
	30	#define XEN_PHYSICAL_MASK __sme_clr((1UL << 52) - 1)
	31	#else
	32	#define XEN_PHYSICAL_MASK __PHYSICAL_MASK
	33	#endif
	34
	35	#define XEN_PTE_MFN_MASK ((pteval_t)(((signed long)PAGE_MASK) & \
	36	XEN_PHYSICAL_MASK))
	37
20e71f2e IY	38	#define XMADDR(x) ((xmaddr_t) { .maddr = (x) })
	39	#define XPADDR(x) ((xpaddr_t) { .paddr = (x) })
	40
	41	/** MACHINE <-> PHYSICAL CONVERSION MACROS **/
	42	#define INVALID_P2M_ENTRY (~0UL)
f4cec35b KRW	43	#define FOREIGN_FRAME_BIT (1UL<<(BITS_PER_LONG-1))
f4cec35b KRW	44	#define IDENTITY_FRAME_BIT (1UL<<(BITS_PER_LONG-2))
20e71f2e	45	#define FOREIGN_FRAME(m) ((m) \| FOREIGN_FRAME_BIT)
f4cec35b	46	#define IDENTITY_FRAME(m) ((m) \| IDENTITY_FRAME_BIT)
20e71f2e	47
cb3eb850 JG	48	#define P2M_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
cb3eb850 JG	49
7e77506a	50	extern unsigned long *machine_to_phys_mapping;
ccbcdf7c	51	extern unsigned long machine_to_phys_nr;
5b8e7d80 JG	52	extern unsigned long *xen_p2m_addr;
	53	extern unsigned long xen_p2m_size;
	54	extern unsigned long xen_max_p2m_pfn;
8006ec3e	55
8edfcf88 DV	56	extern int xen_alloc_p2m_entry(unsigned long pfn);
8edfcf88 DV	57
d451bb7a	58	extern unsigned long get_phys_to_machine(unsigned long pfn);
c3798062	59	extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn);
6eaa412f	60	extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
cb3eb850 JG	61	extern unsigned long __init set_phys_range_identity(unsigned long pfn_s,
cb3eb850 JG	62	unsigned long pfn_e);
20e71f2e	63
3d4ebdb2	64	#ifdef CONFIG_XEN_PV
1429d46d ZK	65	extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
	66	struct gnttab_map_grant_ref *kmap_ops,
	67	struct page **pages, unsigned int count);
1429d46d	68	extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
853d0289	69	struct gnttab_unmap_grant_ref *kunmap_ops,
1429d46d	70	struct page **pages, unsigned int count);
3d4ebdb2 VK	71	#else
	72	static inline int
	73	set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
	74	struct gnttab_map_grant_ref *kmap_ops,
	75	struct page **pages, unsigned int count)
	76	{
	77	return 0;
	78	}
	79
	80	static inline int
	81	clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
	82	struct gnttab_unmap_grant_ref *kunmap_ops,
	83	struct page **pages, unsigned int count)
	84	{
	85	return 0;
	86	}
	87	#endif
448f2831	88
90fff3ea JG	89	/*
	90	* Helper functions to write or read unsigned long values to/from
	91	* memory, when the access may fault.
	92	*/
	93	static inline int xen_safe_write_ulong(unsigned long *addr, unsigned long val)
	94	{
1457d8cf JG	95	int ret = 0;
	96
	97	asm volatile("1: mov %[val], %[ptr]\n"
	98	"2:\n"
e2b48e43	99	_ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_EFAULT_REG, %[ret])
1457d8cf JG	100	: [ret] "+r" (ret), [ptr] "=m" (*addr)
	101	: [val] "r" (val));
	102
	103	return ret;
90fff3ea JG	104	}
90fff3ea JG	105
1457d8cf JG	106	static inline int xen_safe_read_ulong(const unsigned long *addr,
1457d8cf JG	107	unsigned long *val)
90fff3ea	108	{
1457d8cf	109	unsigned long rval = ~0ul;
e2b48e43	110	int ret = 0;
1457d8cf JG	111
	112	asm volatile("1: mov %[ptr], %[rval]\n"
	113	"2:\n"
e2b48e43	114	_ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_EFAULT_REG, %[ret])
1457d8cf JG	115	: [ret] "+r" (ret), [rval] "+r" (rval)
	116	: [ptr] "m" (*addr));
	117	*val = rval;
	118
	119	return ret;
90fff3ea JG	120	}
90fff3ea JG	121
3d4ebdb2	122	#ifdef CONFIG_XEN_PV
0aad5689 JG	123	/*
	124	* When to use pfn_to_mfn(), __pfn_to_mfn() or get_phys_to_machine():
	125	* - pfn_to_mfn() returns either INVALID_P2M_ENTRY or the mfn. No indicator
	126	* bits (identity or foreign) are set.
	127	* - __pfn_to_mfn() returns the found entry of the p2m table. A possibly set
	128	* identity or foreign indicator will be still set. __pfn_to_mfn() is
054954eb JG	129	* encapsulating get_phys_to_machine() which is called in special cases only.
	130	* - get_phys_to_machine() is to be called by __pfn_to_mfn() only in special
	131	* cases needing an extended handling.
0aad5689 JG	132	*/
	133	static inline unsigned long __pfn_to_mfn(unsigned long pfn)
	134	{
054954eb JG	135	unsigned long mfn;
	136
	137	if (pfn < xen_p2m_size)
	138	mfn = xen_p2m_addr[pfn];
	139	else if (unlikely(pfn < xen_max_p2m_pfn))
	140	return get_phys_to_machine(pfn);
	141	else
	142	return IDENTITY_FRAME(pfn);
	143
	144	if (unlikely(mfn == INVALID_P2M_ENTRY))
	145	return get_phys_to_machine(pfn);
	146
	147	return mfn;
0aad5689	148	}
3d4ebdb2 VK	149	#else
	150	static inline unsigned long __pfn_to_mfn(unsigned long pfn)
	151	{
	152	return pfn;
	153	}
	154	#endif
0aad5689	155
20e71f2e IY	156	static inline unsigned long pfn_to_mfn(unsigned long pfn)
20e71f2e IY	157	{
cfd8951e JF	158	unsigned long mfn;
cfd8951e JF	159
0df4f266 JG	160	/*
	161	* Some x86 code are still using pfn_to_mfn instead of
	162	* pfn_to_mfn. This will have to be removed when we figured
	163	* out which call.
	164	*/
20e71f2e IY	165	if (xen_feature(XENFEAT_auto_translated_physmap))
	166	return pfn;
	167
0aad5689	168	mfn = __pfn_to_mfn(pfn);
cfd8951e JF	169
cfd8951e JF	170	if (mfn != INVALID_P2M_ENTRY)
f4cec35b	171	mfn &= ~(FOREIGN_FRAME_BIT \| IDENTITY_FRAME_BIT);
cfd8951e JF	172
cfd8951e JF	173	return mfn;
20e71f2e IY	174	}
	175
	176	static inline int phys_to_machine_mapping_valid(unsigned long pfn)
	177	{
	178	if (xen_feature(XENFEAT_auto_translated_physmap))
	179	return 1;
	180
0aad5689	181	return __pfn_to_mfn(pfn) != INVALID_P2M_ENTRY;
20e71f2e IY	182	}
20e71f2e IY	183
0160676b	184	static inline unsigned long mfn_to_pfn_no_overrides(unsigned long mfn)
20e71f2e IY	185	{
20e71f2e IY	186	unsigned long pfn;
0160676b	187	int ret;
20e71f2e	188
0160676b DV	189	if (unlikely(mfn >= machine_to_phys_nr))
	190	return ~0;
	191
20e71f2e IY	192	/*
	193	* The array access can fail (e.g., device space beyond end of RAM).
	194	* In such cases it doesn't matter what we return (we return garbage),
	195	* but we must handle the fault without crashing!
	196	*/
90fff3ea	197	ret = xen_safe_read_ulong(&machine_to_phys_mapping[mfn], &pfn);
706cc9d2	198	if (ret < 0)
0160676b DV	199	return ~0;
	200
	201	return pfn;
	202	}
	203
	204	static inline unsigned long mfn_to_pfn(unsigned long mfn)
	205	{
	206	unsigned long pfn;
	207
0df4f266 JG	208	/*
	209	* Some x86 code are still using mfn_to_pfn instead of
	210	* gfn_to_pfn. This will have to be removed when we figure
	211	* out which call.
	212	*/
0160676b DV	213	if (xen_feature(XENFEAT_auto_translated_physmap))
	214	return mfn;
	215
	216	pfn = mfn_to_pfn_no_overrides(mfn);
0bb599fd DV	217	if (__pfn_to_mfn(pfn) != mfn)
0bb599fd DV	218	pfn = ~0;
706cc9d2	219
1429d46d	220	/*
0bb599fd DV	221	* pfn is ~0 if there are no entries in the m2p for mfn or the
0bb599fd DV	222	* entry doesn't map back to the mfn.
448f2831	223	*/
0aad5689	224	if (pfn == ~0 && __pfn_to_mfn(mfn) == IDENTITY_FRAME(mfn))
706cc9d2	225	pfn = mfn;
448f2831	226
20e71f2e IY	227	return pfn;
	228	}
	229
	230	static inline xmaddr_t phys_to_machine(xpaddr_t phys)
	231	{
	232	unsigned offset = phys.paddr & ~PAGE_MASK;
947d0496	233	return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) \| offset);
20e71f2e IY	234	}
	235
	236	static inline xpaddr_t machine_to_phys(xmaddr_t machine)
	237	{
	238	unsigned offset = machine.maddr & ~PAGE_MASK;
947d0496	239	return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) \| offset);
20e71f2e IY	240	}
20e71f2e IY	241
0df4f266 JG	242	/* Pseudo-physical <-> Guest conversion */
	243	static inline unsigned long pfn_to_gfn(unsigned long pfn)
	244	{
	245	if (xen_feature(XENFEAT_auto_translated_physmap))
	246	return pfn;
	247	else
	248	return pfn_to_mfn(pfn);
	249	}
	250
	251	static inline unsigned long gfn_to_pfn(unsigned long gfn)
	252	{
	253	if (xen_feature(XENFEAT_auto_translated_physmap))
	254	return gfn;
	255	else
	256	return mfn_to_pfn(gfn);
	257	}
	258
32e09870	259	/* Pseudo-physical <-> Bus conversion */
0df4f266 JG	260	#define pfn_to_bfn(pfn) pfn_to_gfn(pfn)
0df4f266 JG	261	#define bfn_to_pfn(bfn) gfn_to_pfn(bfn)
32e09870	262
20e71f2e IY	263	/*
	264	* We detect special mappings in one of two ways:
	265	* 1. If the MFN is an I/O page then Xen will set the m2p entry
	266	* to be outside our maximum possible pseudophys range.
	267	* 2. If the MFN belongs to a different domain then we will certainly
	268	* not have MFN in our p2m table. Conversely, if the page is ours,
	269	* then we'll have p2m(m2p(MFN))==MFN.
	270	* If we detect a special mapping then it doesn't have a 'struct page'.
	271	* We force !pfn_valid() by returning an out-of-range pointer.
	272	*
	273	* NB. These checks require that, for any MFN that is not in our reservation,
	274	* there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if
	275	* we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN.
	276	* Yikes! Various places must poke in INVALID_P2M_ENTRY for safety.
	277	*
	278	* NB2. When deliberately mapping foreign pages into the p2m table, you must
	279	* use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we
	280	* require. In all the cases we care about, the FOREIGN_FRAME bit is
	281	* masked (e.g., pfn_to_mfn()) so behaviour there is correct.
	282	*/
32e09870	283	static inline unsigned long bfn_to_local_pfn(unsigned long mfn)
20e71f2e	284	{
fc590efe MR	285	unsigned long pfn;
	286
	287	if (xen_feature(XENFEAT_auto_translated_physmap))
	288	return mfn;
	289
	290	pfn = mfn_to_pfn(mfn);
0aad5689	291	if (__pfn_to_mfn(pfn) != mfn)
c0011dbf	292	return -1; /* force !pfn_valid() */
20e71f2e IY	293	return pfn;
	294	}
	295
20e71f2e IY	296	/* VIRT <-> MACHINE conversion */
20e71f2e IY	297	#define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v))))
067e4f17 LW	298	static inline unsigned long virt_to_pfn(const void *v)
	299	{
	300	return PFN_DOWN(__pa(v));
	301	}
b40bf53e	302	#define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v)))
20e71f2e IY	303	#define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT))
20e71f2e IY	304
0df4f266 JG	305	/* VIRT <-> GUEST conversion */
	306	#define virt_to_gfn(v) (pfn_to_gfn(virt_to_pfn(v)))
	307	#define gfn_to_virt(g) (__va(gfn_to_pfn(g) << PAGE_SHIFT))
	308
20e71f2e IY	309	static inline unsigned long pte_mfn(pte_t pte)
20e71f2e IY	310	{
6f0e8bf1	311	return (pte.pte & XEN_PTE_MFN_MASK) >> PAGE_SHIFT;
20e71f2e IY	312	}
	313
	314	static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot)
	315	{
	316	pte_t pte;
	317
	318	pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) \|
b534816b	319	massage_pgprot(pgprot);
20e71f2e IY	320
	321	return pte;
	322	}
	323
	324	static inline pteval_t pte_val_ma(pte_t pte)
	325	{
	326	return pte.pte;
	327	}
	328
	329	static inline pte_t __pte_ma(pteval_t x)
	330	{
	331	return (pte_t) { .pte = x };
	332	}
	333
20e71f2e	334	#define pmd_val_ma(v) ((v).pmd)
f6e58732	335	#ifdef __PAGETABLE_PUD_FOLDED
f2a6a705	336	#define pud_val_ma(v) ((v).p4d.pgd.pgd)
f6e58732 JF	337	#else
	338	#define pud_val_ma(v) ((v).pud)
	339	#endif
20e71f2e	340	#define __pmd_ma(x) ((pmd_t) { (x) } )
20e71f2e	341
f2a6a705 KS	342	#ifdef __PAGETABLE_P4D_FOLDED
	343	#define p4d_val_ma(x) ((x).pgd.pgd)
	344	#else
	345	#define p4d_val_ma(x) ((x).p4d)
	346	#endif
20e71f2e	347
ce803e70	348	xmaddr_t arbitrary_virt_to_machine(void *address);
9976b39b	349	unsigned long arbitrary_virt_to_mfn(void *vaddr);
20e71f2e IY	350	void make_lowmem_page_readonly(void *vaddr);
	351	void make_lowmem_page_readwrite(void *vaddr);
	352
a4dba130	353	static inline bool xen_arch_need_swiotlb(struct device *dev,
291be10f JG	354	phys_addr_t phys,
291be10f JG	355	dma_addr_t dev_addr)
a4dba130 SS	356	{
	357	return false;
	358	}
	359
05e4d316	360	#endif /* _ASM_X86_XEN_PAGE_H */