/* 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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