| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Isaku Yamahata | 422 | 35.23% | 1 | 2.17% |
| Juergen Gross | 191 | 15.94% | 7 | 15.22% |
| Julien Grall | 97 | 8.10% | 4 | 8.70% |
| Jeremy Fitzhardinge | 89 | 7.43% | 10 | 21.74% |
| Vitaly Kuznetsov | 89 | 7.43% | 1 | 2.17% |
| Stefano Stabellini | 82 | 6.84% | 5 | 10.87% |
| Konrad Rzeszutek Wilk | 66 | 5.51% | 5 | 10.87% |
| David Vrabel | 52 | 4.34% | 4 | 8.70% |
| Zoltan Kiss | 48 | 4.01% | 1 | 2.17% |
| Kirill A. Shutemov | 17 | 1.42% | 1 | 2.17% |
| Mukesh Rathor | 14 | 1.17% | 1 | 2.17% |
| Ian Campbell | 12 | 1.00% | 1 | 2.17% |
| Alex Nixon | 8 | 0.67% | 1 | 2.17% |
| Jan Beulich | 4 | 0.33% | 1 | 2.17% |
| H. Peter Anvin | 3 | 0.25% | 1 | 2.17% |
| Ingo Molnar | 3 | 0.25% | 1 | 2.17% |
| Greg Kroah-Hartman | 1 | 0.08% | 1 | 2.17% |
| Total | 1198 | 46 |
/* 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" ".section .fixup, \"ax\"\n" "3: sub $1, %[ret]\n" " jmp 2b\n" ".previous\n" _ASM_EXTABLE(1b, 3b) : [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) { int ret = 0; unsigned long rval = ~0ul; asm volatile("1: mov %[ptr], %[rval]\n" "2:\n" ".section .fixup, \"ax\"\n" "3: sub $1, %[ret]\n" " jmp 2b\n" ".previous\n" _ASM_EXTABLE(1b, 3b) : [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)))) #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 */