/* 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 */ xmaddr_t; /* Xen pseudo-physical address */ xpaddr_t; #ifdef CONFIG_X86_64 #define XEN_PHYSICAL_MASK … #else #define XEN_PHYSICAL_MASK … #endif #define XEN_PTE_MFN_MASK … #define XMADDR(x) … #define XPADDR(x) … /**** MACHINE <-> PHYSICAL CONVERSION MACROS ****/ #define INVALID_P2M_ENTRY … #define FOREIGN_FRAME_BIT … #define IDENTITY_FRAME_BIT … #define FOREIGN_FRAME(m) … #define IDENTITY_FRAME(m) … #define P2M_PER_PAGE … 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) { … } static inline int xen_safe_read_ulong(const unsigned long *addr, unsigned long *val) { … } #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) { … } #else static inline unsigned long __pfn_to_mfn(unsigned long pfn) { return pfn; } #endif static inline unsigned long pfn_to_mfn(unsigned long pfn) { … } static inline int phys_to_machine_mapping_valid(unsigned long pfn) { … } static inline unsigned long mfn_to_pfn_no_overrides(unsigned long mfn) { … } static inline unsigned long mfn_to_pfn(unsigned long mfn) { … } static inline xmaddr_t phys_to_machine(xpaddr_t phys) { … } static inline xpaddr_t machine_to_phys(xmaddr_t machine) { … } /* Pseudo-physical <-> Guest conversion */ static inline unsigned long pfn_to_gfn(unsigned long pfn) { … } static inline unsigned long gfn_to_pfn(unsigned long gfn) { … } /* Pseudo-physical <-> Bus conversion */ #define pfn_to_bfn(pfn) … #define bfn_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) { … } /* VIRT <-> MACHINE conversion */ #define virt_to_machine(v) … static inline unsigned long virt_to_pfn(const void *v) { … } #define virt_to_mfn(v) … #define mfn_to_virt(m) … /* VIRT <-> GUEST conversion */ #define virt_to_gfn(v) … #define gfn_to_virt(g) … static inline unsigned long pte_mfn(pte_t pte) { … } static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot) { … } static inline pteval_t pte_val_ma(pte_t pte) { … } static inline pte_t __pte_ma(pteval_t x) { … } #define pmd_val_ma(v) … #ifdef __PAGETABLE_PUD_FOLDED #define pud_val_ma … #else #define pud_val_ma(v) … #endif #define __pmd_ma(x) … #ifdef __PAGETABLE_P4D_FOLDED #define p4d_val_ma … #else #define p4d_val_ma(x) … #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) { … } #endif /* _ASM_X86_XEN_PAGE_H */
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