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373 lines
9.8 KiB
373 lines
9.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_X86_XEN_PAGE_H |
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#define _ASM_X86_XEN_PAGE_H |
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#include <linux/kernel.h> |
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#include <linux/types.h> |
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#include <linux/spinlock.h> |
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#include <linux/pfn.h> |
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#include <linux/mm.h> |
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#include <linux/device.h> |
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#include <asm/extable.h> |
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#include <asm/page.h> |
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#include <xen/interface/xen.h> |
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#include <xen/interface/grant_table.h> |
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#include <xen/features.h> |
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/* Xen machine address */ |
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typedef struct xmaddr { |
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phys_addr_t maddr; |
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} xmaddr_t; |
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/* Xen pseudo-physical address */ |
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typedef struct xpaddr { |
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phys_addr_t paddr; |
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} xpaddr_t; |
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#ifdef CONFIG_X86_64 |
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#define XEN_PHYSICAL_MASK __sme_clr((1UL << 52) - 1) |
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#else |
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#define XEN_PHYSICAL_MASK __PHYSICAL_MASK |
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#endif |
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#define XEN_PTE_MFN_MASK ((pteval_t)(((signed long)PAGE_MASK) & \ |
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XEN_PHYSICAL_MASK)) |
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#define XMADDR(x) ((xmaddr_t) { .maddr = (x) }) |
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#define XPADDR(x) ((xpaddr_t) { .paddr = (x) }) |
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/**** MACHINE <-> PHYSICAL CONVERSION MACROS ****/ |
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#define INVALID_P2M_ENTRY (~0UL) |
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#define FOREIGN_FRAME_BIT (1UL<<(BITS_PER_LONG-1)) |
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#define IDENTITY_FRAME_BIT (1UL<<(BITS_PER_LONG-2)) |
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#define FOREIGN_FRAME(m) ((m) | FOREIGN_FRAME_BIT) |
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#define IDENTITY_FRAME(m) ((m) | IDENTITY_FRAME_BIT) |
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#define P2M_PER_PAGE (PAGE_SIZE / sizeof(unsigned long)) |
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extern unsigned long *machine_to_phys_mapping; |
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extern unsigned long machine_to_phys_nr; |
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extern unsigned long *xen_p2m_addr; |
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extern unsigned long xen_p2m_size; |
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extern unsigned long xen_max_p2m_pfn; |
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extern int xen_alloc_p2m_entry(unsigned long pfn); |
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extern unsigned long get_phys_to_machine(unsigned long pfn); |
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extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn); |
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extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn); |
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extern unsigned long __init set_phys_range_identity(unsigned long pfn_s, |
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unsigned long pfn_e); |
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#ifdef CONFIG_XEN_PV |
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extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops, |
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struct gnttab_map_grant_ref *kmap_ops, |
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struct page **pages, unsigned int count); |
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extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops, |
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struct gnttab_unmap_grant_ref *kunmap_ops, |
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struct page **pages, unsigned int count); |
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#else |
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static inline int |
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set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops, |
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struct gnttab_map_grant_ref *kmap_ops, |
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struct page **pages, unsigned int count) |
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{ |
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return 0; |
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} |
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static inline int |
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clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops, |
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struct gnttab_unmap_grant_ref *kunmap_ops, |
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struct page **pages, unsigned int count) |
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{ |
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return 0; |
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} |
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#endif |
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/* |
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* Helper functions to write or read unsigned long values to/from |
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* memory, when the access may fault. |
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*/ |
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static inline int xen_safe_write_ulong(unsigned long *addr, unsigned long val) |
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{ |
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int ret = 0; |
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asm volatile("1: mov %[val], %[ptr]\n" |
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"2:\n" |
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".section .fixup, \"ax\"\n" |
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"3: sub $1, %[ret]\n" |
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" jmp 2b\n" |
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".previous\n" |
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_ASM_EXTABLE(1b, 3b) |
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: [ret] "+r" (ret), [ptr] "=m" (*addr) |
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: [val] "r" (val)); |
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return ret; |
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} |
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static inline int xen_safe_read_ulong(const unsigned long *addr, |
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unsigned long *val) |
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{ |
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int ret = 0; |
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unsigned long rval = ~0ul; |
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asm volatile("1: mov %[ptr], %[rval]\n" |
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"2:\n" |
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".section .fixup, \"ax\"\n" |
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"3: sub $1, %[ret]\n" |
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" jmp 2b\n" |
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".previous\n" |
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_ASM_EXTABLE(1b, 3b) |
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: [ret] "+r" (ret), [rval] "+r" (rval) |
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: [ptr] "m" (*addr)); |
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*val = rval; |
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return ret; |
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} |
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#ifdef CONFIG_XEN_PV |
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/* |
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* When to use pfn_to_mfn(), __pfn_to_mfn() or get_phys_to_machine(): |
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* - pfn_to_mfn() returns either INVALID_P2M_ENTRY or the mfn. No indicator |
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* bits (identity or foreign) are set. |
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* - __pfn_to_mfn() returns the found entry of the p2m table. A possibly set |
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* identity or foreign indicator will be still set. __pfn_to_mfn() is |
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* encapsulating get_phys_to_machine() which is called in special cases only. |
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* - get_phys_to_machine() is to be called by __pfn_to_mfn() only in special |
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* cases needing an extended handling. |
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*/ |
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static inline unsigned long __pfn_to_mfn(unsigned long pfn) |
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{ |
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unsigned long mfn; |
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if (pfn < xen_p2m_size) |
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mfn = xen_p2m_addr[pfn]; |
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else if (unlikely(pfn < xen_max_p2m_pfn)) |
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return get_phys_to_machine(pfn); |
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else |
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return IDENTITY_FRAME(pfn); |
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if (unlikely(mfn == INVALID_P2M_ENTRY)) |
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return get_phys_to_machine(pfn); |
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return mfn; |
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} |
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#else |
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static inline unsigned long __pfn_to_mfn(unsigned long pfn) |
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{ |
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return pfn; |
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} |
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#endif |
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static inline unsigned long pfn_to_mfn(unsigned long pfn) |
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{ |
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unsigned long mfn; |
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/* |
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* Some x86 code are still using pfn_to_mfn instead of |
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* pfn_to_mfn. This will have to be removed when we figured |
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* out which call. |
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*/ |
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if (xen_feature(XENFEAT_auto_translated_physmap)) |
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return pfn; |
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mfn = __pfn_to_mfn(pfn); |
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if (mfn != INVALID_P2M_ENTRY) |
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mfn &= ~(FOREIGN_FRAME_BIT | IDENTITY_FRAME_BIT); |
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return mfn; |
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} |
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static inline int phys_to_machine_mapping_valid(unsigned long pfn) |
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{ |
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if (xen_feature(XENFEAT_auto_translated_physmap)) |
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return 1; |
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return __pfn_to_mfn(pfn) != INVALID_P2M_ENTRY; |
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} |
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static inline unsigned long mfn_to_pfn_no_overrides(unsigned long mfn) |
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{ |
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unsigned long pfn; |
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int ret; |
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if (unlikely(mfn >= machine_to_phys_nr)) |
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return ~0; |
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/* |
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* The array access can fail (e.g., device space beyond end of RAM). |
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* In such cases it doesn't matter what we return (we return garbage), |
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* but we must handle the fault without crashing! |
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*/ |
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ret = xen_safe_read_ulong(&machine_to_phys_mapping[mfn], &pfn); |
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if (ret < 0) |
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return ~0; |
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return pfn; |
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} |
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static inline unsigned long mfn_to_pfn(unsigned long mfn) |
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{ |
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unsigned long pfn; |
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/* |
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* Some x86 code are still using mfn_to_pfn instead of |
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* gfn_to_pfn. This will have to be removed when we figure |
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* out which call. |
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*/ |
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if (xen_feature(XENFEAT_auto_translated_physmap)) |
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return mfn; |
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pfn = mfn_to_pfn_no_overrides(mfn); |
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if (__pfn_to_mfn(pfn) != mfn) |
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pfn = ~0; |
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/* |
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* pfn is ~0 if there are no entries in the m2p for mfn or the |
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* entry doesn't map back to the mfn. |
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*/ |
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if (pfn == ~0 && __pfn_to_mfn(mfn) == IDENTITY_FRAME(mfn)) |
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pfn = mfn; |
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return pfn; |
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} |
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static inline xmaddr_t phys_to_machine(xpaddr_t phys) |
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{ |
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unsigned offset = phys.paddr & ~PAGE_MASK; |
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return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset); |
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} |
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static inline xpaddr_t machine_to_phys(xmaddr_t machine) |
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{ |
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unsigned offset = machine.maddr & ~PAGE_MASK; |
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return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset); |
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} |
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/* Pseudo-physical <-> Guest conversion */ |
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static inline unsigned long pfn_to_gfn(unsigned long pfn) |
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{ |
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if (xen_feature(XENFEAT_auto_translated_physmap)) |
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return pfn; |
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else |
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return pfn_to_mfn(pfn); |
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} |
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static inline unsigned long gfn_to_pfn(unsigned long gfn) |
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{ |
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if (xen_feature(XENFEAT_auto_translated_physmap)) |
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return gfn; |
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else |
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return mfn_to_pfn(gfn); |
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} |
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/* Pseudo-physical <-> Bus conversion */ |
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#define pfn_to_bfn(pfn) pfn_to_gfn(pfn) |
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#define bfn_to_pfn(bfn) gfn_to_pfn(bfn) |
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/* |
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* We detect special mappings in one of two ways: |
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* 1. If the MFN is an I/O page then Xen will set the m2p entry |
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* to be outside our maximum possible pseudophys range. |
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* 2. If the MFN belongs to a different domain then we will certainly |
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* not have MFN in our p2m table. Conversely, if the page is ours, |
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* then we'll have p2m(m2p(MFN))==MFN. |
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* If we detect a special mapping then it doesn't have a 'struct page'. |
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* We force !pfn_valid() by returning an out-of-range pointer. |
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* |
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* NB. These checks require that, for any MFN that is not in our reservation, |
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* there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if |
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* we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN. |
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* Yikes! Various places must poke in INVALID_P2M_ENTRY for safety. |
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* |
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* NB2. When deliberately mapping foreign pages into the p2m table, you *must* |
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* use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we |
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* require. In all the cases we care about, the FOREIGN_FRAME bit is |
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* masked (e.g., pfn_to_mfn()) so behaviour there is correct. |
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*/ |
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static inline unsigned long bfn_to_local_pfn(unsigned long mfn) |
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{ |
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unsigned long pfn; |
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if (xen_feature(XENFEAT_auto_translated_physmap)) |
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return mfn; |
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pfn = mfn_to_pfn(mfn); |
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if (__pfn_to_mfn(pfn) != mfn) |
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return -1; /* force !pfn_valid() */ |
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return pfn; |
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} |
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/* VIRT <-> MACHINE conversion */ |
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#define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v)))) |
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#define virt_to_pfn(v) (PFN_DOWN(__pa(v))) |
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#define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v))) |
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#define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT)) |
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/* VIRT <-> GUEST conversion */ |
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#define virt_to_gfn(v) (pfn_to_gfn(virt_to_pfn(v))) |
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#define gfn_to_virt(g) (__va(gfn_to_pfn(g) << PAGE_SHIFT)) |
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static inline unsigned long pte_mfn(pte_t pte) |
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{ |
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return (pte.pte & XEN_PTE_MFN_MASK) >> PAGE_SHIFT; |
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} |
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static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot) |
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{ |
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pte_t pte; |
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pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) | |
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massage_pgprot(pgprot); |
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return pte; |
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} |
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static inline pteval_t pte_val_ma(pte_t pte) |
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{ |
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return pte.pte; |
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} |
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static inline pte_t __pte_ma(pteval_t x) |
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{ |
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return (pte_t) { .pte = x }; |
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} |
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#define pmd_val_ma(v) ((v).pmd) |
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#ifdef __PAGETABLE_PUD_FOLDED |
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#define pud_val_ma(v) ((v).p4d.pgd.pgd) |
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#else |
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#define pud_val_ma(v) ((v).pud) |
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#endif |
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#define __pmd_ma(x) ((pmd_t) { (x) } ) |
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#ifdef __PAGETABLE_P4D_FOLDED |
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#define p4d_val_ma(x) ((x).pgd.pgd) |
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#else |
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#define p4d_val_ma(x) ((x).p4d) |
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#endif |
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xmaddr_t arbitrary_virt_to_machine(void *address); |
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unsigned long arbitrary_virt_to_mfn(void *vaddr); |
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void make_lowmem_page_readonly(void *vaddr); |
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void make_lowmem_page_readwrite(void *vaddr); |
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#define xen_remap(cookie, size) ioremap((cookie), (size)) |
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#define xen_unmap(cookie) iounmap((cookie)) |
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static inline bool xen_arch_need_swiotlb(struct device *dev, |
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phys_addr_t phys, |
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dma_addr_t dev_addr) |
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{ |
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return false; |
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} |
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static inline unsigned long xen_get_swiotlb_free_pages(unsigned int order) |
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{ |
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return __get_free_pages(__GFP_NOWARN, order); |
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} |
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#endif /* _ASM_X86_XEN_PAGE_H */
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