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xen: additional features for 3.19-rc0
- Linear p2m for x86 PV guests which simplifies the p2m code, improves
performance and will allow for > 512 GB PV guests in the future.
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Merge tag 'stable/for-linus-3.19-rc0b-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull additional xen update from David Vrabel:
"Xen: additional features for 3.19-rc0
- Linear p2m for x86 PV guests which simplifies the p2m code,
improves performance and will allow for > 512 GB PV guests in the
future.
A last-minute, configuration specific issue was discovered with this
change which is why it was not included in my previous pull request.
This is now been fixed and tested"
* tag 'stable/for-linus-3.19-rc0b-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen: switch to post-init routines in xen mmu.c earlier
Revert "swiotlb-xen: pass dev_addr to swiotlb_tbl_unmap_single"
xen: annotate xen_set_identity_and_remap_chunk() with __init
xen: introduce helper functions to do safe read and write accesses
xen: Speed up set_phys_to_machine() by using read-only mappings
xen: switch to linear virtual mapped sparse p2m list
xen: Hide get_phys_to_machine() to be able to tune common path
x86: Introduce function to get pmd entry pointer
xen: Delay invalidating extra memory
xen: Delay m2p_override initialization
xen: Delay remapping memory of pv-domain
xen: use common page allocation function in p2m.c
xen: Make functions static
xen: fix some style issues in p2m.c
This commit is contained in:
Linus Torvalds
commit
eb64c3c6cd
@ -452,6 +452,7 @@ static inline void update_page_count(int level, unsigned long pages) { }
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extern pte_t *lookup_address(unsigned long address, unsigned int *level);
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extern pte_t *lookup_address_in_pgd(pgd_t *pgd, unsigned long address,
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unsigned int *level);
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extern pmd_t *lookup_pmd_address(unsigned long address);
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extern phys_addr_t slow_virt_to_phys(void *__address);
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extern int kernel_map_pages_in_pgd(pgd_t *pgd, u64 pfn, unsigned long address,
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unsigned numpages, unsigned long page_flags);
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@ -41,10 +41,12 @@ typedef struct xpaddr {
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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 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 __init early_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 set_phys_range_identity(unsigned long pfn_s,
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unsigned long pfn_e);
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@ -52,17 +54,52 @@ extern unsigned long set_phys_range_identity(unsigned long pfn_s,
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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 m2p_add_override(unsigned long mfn, struct page *page,
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struct gnttab_map_grant_ref *kmap_op);
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extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_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 m2p_remove_override(struct page *page,
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struct gnttab_map_grant_ref *kmap_op,
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unsigned long mfn);
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extern struct page *m2p_find_override(unsigned long mfn);
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extern unsigned long m2p_find_override_pfn(unsigned long mfn, unsigned long pfn);
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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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return __put_user(val, (unsigned long __user *)addr);
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}
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static inline int xen_safe_read_ulong(unsigned long *addr, unsigned long *val)
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{
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return __get_user(*val, (unsigned long __user *)addr);
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}
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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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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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@ -70,7 +107,7 @@ static inline unsigned long pfn_to_mfn(unsigned long pfn)
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if (xen_feature(XENFEAT_auto_translated_physmap))
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return pfn;
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mfn = get_phys_to_machine(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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@ -83,7 +120,7 @@ static inline int phys_to_machine_mapping_valid(unsigned long pfn)
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if (xen_feature(XENFEAT_auto_translated_physmap))
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return 1;
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return get_phys_to_machine(pfn) != INVALID_P2M_ENTRY;
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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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@ -102,7 +139,7 @@ static inline unsigned long mfn_to_pfn_no_overrides(unsigned long mfn)
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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 = __get_user(pfn, &machine_to_phys_mapping[mfn]);
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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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@ -117,7 +154,7 @@ static inline unsigned long mfn_to_pfn(unsigned long mfn)
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return mfn;
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pfn = mfn_to_pfn_no_overrides(mfn);
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if (get_phys_to_machine(pfn) != mfn) {
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if (__pfn_to_mfn(pfn) != mfn) {
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/*
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* If this appears to be a foreign mfn (because the pfn
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* doesn't map back to the mfn), then check the local override
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@ -133,8 +170,7 @@ static inline unsigned long mfn_to_pfn(unsigned long mfn)
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* entry doesn't map back to the mfn and m2p_override doesn't have a
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* valid entry for it.
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*/
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if (pfn == ~0 &&
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get_phys_to_machine(mfn) == IDENTITY_FRAME(mfn))
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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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@ -180,7 +216,7 @@ static inline unsigned long mfn_to_local_pfn(unsigned long mfn)
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return mfn;
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pfn = mfn_to_pfn(mfn);
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if (get_phys_to_machine(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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@ -383,6 +383,26 @@ static pte_t *_lookup_address_cpa(struct cpa_data *cpa, unsigned long address,
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return lookup_address(address, level);
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}
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/*
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* Lookup the PMD entry for a virtual address. Return a pointer to the entry
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* or NULL if not present.
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*/
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pmd_t *lookup_pmd_address(unsigned long address)
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{
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pgd_t *pgd;
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pud_t *pud;
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pgd = pgd_offset_k(address);
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if (pgd_none(*pgd))
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return NULL;
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pud = pud_offset(pgd, address);
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if (pud_none(*pud) || pud_large(*pud) || !pud_present(*pud))
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return NULL;
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return pmd_offset(pud, address);
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}
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/*
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* This is necessary because __pa() does not work on some
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* kinds of memory, like vmalloc() or the alloc_remap()
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@ -387,7 +387,7 @@ static pteval_t pte_pfn_to_mfn(pteval_t val)
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unsigned long mfn;
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if (!xen_feature(XENFEAT_auto_translated_physmap))
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mfn = get_phys_to_machine(pfn);
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mfn = __pfn_to_mfn(pfn);
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else
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mfn = pfn;
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/*
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@ -1113,20 +1113,16 @@ static void __init xen_cleanhighmap(unsigned long vaddr,
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* instead of somewhere later and be confusing. */
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xen_mc_flush();
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}
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static void __init xen_pagetable_p2m_copy(void)
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static void __init xen_pagetable_p2m_free(void)
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{
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unsigned long size;
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unsigned long addr;
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unsigned long new_mfn_list;
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if (xen_feature(XENFEAT_auto_translated_physmap))
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return;
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size = PAGE_ALIGN(xen_start_info->nr_pages * sizeof(unsigned long));
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new_mfn_list = xen_revector_p2m_tree();
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/* No memory or already called. */
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if (!new_mfn_list || new_mfn_list == xen_start_info->mfn_list)
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if ((unsigned long)xen_p2m_addr == xen_start_info->mfn_list)
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return;
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/* using __ka address and sticking INVALID_P2M_ENTRY! */
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@ -1144,8 +1140,6 @@ static void __init xen_pagetable_p2m_copy(void)
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size = PAGE_ALIGN(xen_start_info->nr_pages * sizeof(unsigned long));
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memblock_free(__pa(xen_start_info->mfn_list), size);
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/* And revector! Bye bye old array */
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xen_start_info->mfn_list = new_mfn_list;
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/* At this stage, cleanup_highmap has already cleaned __ka space
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* from _brk_limit way up to the max_pfn_mapped (which is the end of
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@ -1169,17 +1163,35 @@ static void __init xen_pagetable_p2m_copy(void)
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}
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#endif
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static void __init xen_pagetable_p2m_setup(void)
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{
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if (xen_feature(XENFEAT_auto_translated_physmap))
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return;
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xen_vmalloc_p2m_tree();
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#ifdef CONFIG_X86_64
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xen_pagetable_p2m_free();
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#endif
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/* And revector! Bye bye old array */
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xen_start_info->mfn_list = (unsigned long)xen_p2m_addr;
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}
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static void __init xen_pagetable_init(void)
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{
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paging_init();
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#ifdef CONFIG_X86_64
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xen_pagetable_p2m_copy();
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#endif
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xen_post_allocator_init();
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xen_pagetable_p2m_setup();
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/* Allocate and initialize top and mid mfn levels for p2m structure */
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xen_build_mfn_list_list();
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/* Remap memory freed due to conflicts with E820 map */
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if (!xen_feature(XENFEAT_auto_translated_physmap))
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xen_remap_memory();
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xen_setup_shared_info();
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xen_post_allocator_init();
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}
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static void xen_write_cr2(unsigned long cr2)
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{
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1210
arch/x86/xen/p2m.c
1210
arch/x86/xen/p2m.c
File diff suppressed because it is too large
Load Diff
@ -30,6 +30,7 @@
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#include "xen-ops.h"
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#include "vdso.h"
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#include "p2m.h"
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#include "mmu.h"
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/* These are code, but not functions. Defined in entry.S */
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extern const char xen_hypervisor_callback[];
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@ -47,8 +48,19 @@ struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
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/* Number of pages released from the initial allocation. */
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unsigned long xen_released_pages;
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/* Buffer used to remap identity mapped pages */
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unsigned long xen_remap_buf[P2M_PER_PAGE] __initdata;
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/*
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* Buffer used to remap identity mapped pages. We only need the virtual space.
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* The physical page behind this address is remapped as needed to different
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* buffer pages.
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*/
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#define REMAP_SIZE (P2M_PER_PAGE - 3)
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static struct {
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unsigned long next_area_mfn;
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unsigned long target_pfn;
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unsigned long size;
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unsigned long mfns[REMAP_SIZE];
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} xen_remap_buf __initdata __aligned(PAGE_SIZE);
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static unsigned long xen_remap_mfn __initdata = INVALID_P2M_ENTRY;
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/*
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* The maximum amount of extra memory compared to the base size. The
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@ -64,7 +76,6 @@ unsigned long xen_remap_buf[P2M_PER_PAGE] __initdata;
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static void __init xen_add_extra_mem(u64 start, u64 size)
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{
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unsigned long pfn;
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int i;
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for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
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@ -84,75 +95,76 @@ static void __init xen_add_extra_mem(u64 start, u64 size)
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printk(KERN_WARNING "Warning: not enough extra memory regions\n");
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memblock_reserve(start, size);
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xen_max_p2m_pfn = PFN_DOWN(start + size);
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for (pfn = PFN_DOWN(start); pfn < xen_max_p2m_pfn; pfn++) {
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unsigned long mfn = pfn_to_mfn(pfn);
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if (WARN_ONCE(mfn == pfn, "Trying to over-write 1-1 mapping (pfn: %lx)\n", pfn))
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continue;
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WARN_ONCE(mfn != INVALID_P2M_ENTRY, "Trying to remove %lx which has %lx mfn!\n",
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pfn, mfn);
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__set_phys_to_machine(pfn, INVALID_P2M_ENTRY);
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}
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}
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static unsigned long __init xen_do_chunk(unsigned long start,
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unsigned long end, bool release)
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static void __init xen_del_extra_mem(u64 start, u64 size)
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{
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struct xen_memory_reservation reservation = {
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.address_bits = 0,
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.extent_order = 0,
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.domid = DOMID_SELF
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};
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unsigned long len = 0;
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unsigned long pfn;
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int ret;
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int i;
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u64 start_r, size_r;
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|
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for (pfn = start; pfn < end; pfn++) {
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unsigned long frame;
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unsigned long mfn = pfn_to_mfn(pfn);
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for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
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start_r = xen_extra_mem[i].start;
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size_r = xen_extra_mem[i].size;
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|
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if (release) {
|
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/* Make sure pfn exists to start with */
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if (mfn == INVALID_P2M_ENTRY || mfn_to_pfn(mfn) != pfn)
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continue;
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frame = mfn;
|
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} else {
|
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if (mfn != INVALID_P2M_ENTRY)
|
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continue;
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frame = pfn;
|
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}
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set_xen_guest_handle(reservation.extent_start, &frame);
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reservation.nr_extents = 1;
|
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|
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ret = HYPERVISOR_memory_op(release ? XENMEM_decrease_reservation : XENMEM_populate_physmap,
|
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&reservation);
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WARN(ret != 1, "Failed to %s pfn %lx err=%d\n",
|
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release ? "release" : "populate", pfn, ret);
|
||||
|
||||
if (ret == 1) {
|
||||
if (!early_set_phys_to_machine(pfn, release ? INVALID_P2M_ENTRY : frame)) {
|
||||
if (release)
|
||||
break;
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set_xen_guest_handle(reservation.extent_start, &frame);
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reservation.nr_extents = 1;
|
||||
ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation,
|
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&reservation);
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||||
break;
|
||||
}
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len++;
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||||
} else
|
||||
/* Start of region. */
|
||||
if (start_r == start) {
|
||||
BUG_ON(size > size_r);
|
||||
xen_extra_mem[i].start += size;
|
||||
xen_extra_mem[i].size -= size;
|
||||
break;
|
||||
}
|
||||
/* End of region. */
|
||||
if (start_r + size_r == start + size) {
|
||||
BUG_ON(size > size_r);
|
||||
xen_extra_mem[i].size -= size;
|
||||
break;
|
||||
}
|
||||
/* Mid of region. */
|
||||
if (start > start_r && start < start_r + size_r) {
|
||||
BUG_ON(start + size > start_r + size_r);
|
||||
xen_extra_mem[i].size = start - start_r;
|
||||
/* Calling memblock_reserve() again is okay. */
|
||||
xen_add_extra_mem(start + size, start_r + size_r -
|
||||
(start + size));
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (len)
|
||||
printk(KERN_INFO "%s %lx-%lx pfn range: %lu pages %s\n",
|
||||
release ? "Freeing" : "Populating",
|
||||
start, end, len,
|
||||
release ? "freed" : "added");
|
||||
memblock_free(start, size);
|
||||
}
|
||||
|
||||
return len;
|
||||
/*
|
||||
* Called during boot before the p2m list can take entries beyond the
|
||||
* hypervisor supplied p2m list. Entries in extra mem are to be regarded as
|
||||
* invalid.
|
||||
*/
|
||||
unsigned long __ref xen_chk_extra_mem(unsigned long pfn)
|
||||
{
|
||||
int i;
|
||||
unsigned long addr = PFN_PHYS(pfn);
|
||||
|
||||
for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
|
||||
if (addr >= xen_extra_mem[i].start &&
|
||||
addr < xen_extra_mem[i].start + xen_extra_mem[i].size)
|
||||
return INVALID_P2M_ENTRY;
|
||||
}
|
||||
|
||||
return IDENTITY_FRAME(pfn);
|
||||
}
|
||||
|
||||
/*
|
||||
* Mark all pfns of extra mem as invalid in p2m list.
|
||||
*/
|
||||
void __init xen_inv_extra_mem(void)
|
||||
{
|
||||
unsigned long pfn, pfn_s, pfn_e;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
|
||||
pfn_s = PFN_DOWN(xen_extra_mem[i].start);
|
||||
pfn_e = PFN_UP(xen_extra_mem[i].start + xen_extra_mem[i].size);
|
||||
for (pfn = pfn_s; pfn < pfn_e; pfn++)
|
||||
set_phys_to_machine(pfn, INVALID_P2M_ENTRY);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
@ -198,26 +210,62 @@ static unsigned long __init xen_find_pfn_range(
|
||||
return done;
|
||||
}
|
||||
|
||||
static int __init xen_free_mfn(unsigned long mfn)
|
||||
{
|
||||
struct xen_memory_reservation reservation = {
|
||||
.address_bits = 0,
|
||||
.extent_order = 0,
|
||||
.domid = DOMID_SELF
|
||||
};
|
||||
|
||||
set_xen_guest_handle(reservation.extent_start, &mfn);
|
||||
reservation.nr_extents = 1;
|
||||
|
||||
return HYPERVISOR_memory_op(XENMEM_decrease_reservation, &reservation);
|
||||
}
|
||||
|
||||
/*
|
||||
* This releases a chunk of memory and then does the identity map. It's used as
|
||||
* This releases a chunk of memory and then does the identity map. It's used
|
||||
* as a fallback if the remapping fails.
|
||||
*/
|
||||
static void __init xen_set_identity_and_release_chunk(unsigned long start_pfn,
|
||||
unsigned long end_pfn, unsigned long nr_pages, unsigned long *identity,
|
||||
unsigned long *released)
|
||||
{
|
||||
unsigned long len = 0;
|
||||
unsigned long pfn, end;
|
||||
int ret;
|
||||
|
||||
WARN_ON(start_pfn > end_pfn);
|
||||
|
||||
end = min(end_pfn, nr_pages);
|
||||
for (pfn = start_pfn; pfn < end; pfn++) {
|
||||
unsigned long mfn = pfn_to_mfn(pfn);
|
||||
|
||||
/* Make sure pfn exists to start with */
|
||||
if (mfn == INVALID_P2M_ENTRY || mfn_to_pfn(mfn) != pfn)
|
||||
continue;
|
||||
|
||||
ret = xen_free_mfn(mfn);
|
||||
WARN(ret != 1, "Failed to release pfn %lx err=%d\n", pfn, ret);
|
||||
|
||||
if (ret == 1) {
|
||||
if (!__set_phys_to_machine(pfn, INVALID_P2M_ENTRY))
|
||||
break;
|
||||
len++;
|
||||
} else
|
||||
break;
|
||||
}
|
||||
|
||||
/* Need to release pages first */
|
||||
*released += xen_do_chunk(start_pfn, min(end_pfn, nr_pages), true);
|
||||
*released += len;
|
||||
*identity += set_phys_range_identity(start_pfn, end_pfn);
|
||||
}
|
||||
|
||||
/*
|
||||
* Helper function to update both the p2m and m2p tables.
|
||||
* Helper function to update the p2m and m2p tables and kernel mapping.
|
||||
*/
|
||||
static unsigned long __init xen_update_mem_tables(unsigned long pfn,
|
||||
unsigned long mfn)
|
||||
static void __init xen_update_mem_tables(unsigned long pfn, unsigned long mfn)
|
||||
{
|
||||
struct mmu_update update = {
|
||||
.ptr = ((unsigned long long)mfn << PAGE_SHIFT) | MMU_MACHPHYS_UPDATE,
|
||||
@ -225,161 +273,88 @@ static unsigned long __init xen_update_mem_tables(unsigned long pfn,
|
||||
};
|
||||
|
||||
/* Update p2m */
|
||||
if (!early_set_phys_to_machine(pfn, mfn)) {
|
||||
if (!set_phys_to_machine(pfn, mfn)) {
|
||||
WARN(1, "Failed to set p2m mapping for pfn=%ld mfn=%ld\n",
|
||||
pfn, mfn);
|
||||
return false;
|
||||
BUG();
|
||||
}
|
||||
|
||||
/* Update m2p */
|
||||
if (HYPERVISOR_mmu_update(&update, 1, NULL, DOMID_SELF) < 0) {
|
||||
WARN(1, "Failed to set m2p mapping for mfn=%ld pfn=%ld\n",
|
||||
mfn, pfn);
|
||||
return false;
|
||||
BUG();
|
||||
}
|
||||
|
||||
return true;
|
||||
/* Update kernel mapping, but not for highmem. */
|
||||
if ((pfn << PAGE_SHIFT) >= __pa(high_memory))
|
||||
return;
|
||||
|
||||
if (HYPERVISOR_update_va_mapping((unsigned long)__va(pfn << PAGE_SHIFT),
|
||||
mfn_pte(mfn, PAGE_KERNEL), 0)) {
|
||||
WARN(1, "Failed to update kernel mapping for mfn=%ld pfn=%ld\n",
|
||||
mfn, pfn);
|
||||
BUG();
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* This function updates the p2m and m2p tables with an identity map from
|
||||
* start_pfn to start_pfn+size and remaps the underlying RAM of the original
|
||||
* allocation at remap_pfn. It must do so carefully in P2M_PER_PAGE sized blocks
|
||||
* to not exhaust the reserved brk space. Doing it in properly aligned blocks
|
||||
* ensures we only allocate the minimum required leaf pages in the p2m table. It
|
||||
* copies the existing mfns from the p2m table under the 1:1 map, overwrites
|
||||
* them with the identity map and then updates the p2m and m2p tables with the
|
||||
* remapped memory.
|
||||
* start_pfn to start_pfn+size and prepares remapping the underlying RAM of the
|
||||
* original allocation at remap_pfn. The information needed for remapping is
|
||||
* saved in the memory itself to avoid the need for allocating buffers. The
|
||||
* complete remap information is contained in a list of MFNs each containing
|
||||
* up to REMAP_SIZE MFNs and the start target PFN for doing the remap.
|
||||
* This enables us to preserve the original mfn sequence while doing the
|
||||
* remapping at a time when the memory management is capable of allocating
|
||||
* virtual and physical memory in arbitrary amounts, see 'xen_remap_memory' and
|
||||
* its callers.
|
||||
*/
|
||||
static unsigned long __init xen_do_set_identity_and_remap_chunk(
|
||||
static void __init xen_do_set_identity_and_remap_chunk(
|
||||
unsigned long start_pfn, unsigned long size, unsigned long remap_pfn)
|
||||
{
|
||||
unsigned long buf = (unsigned long)&xen_remap_buf;
|
||||
unsigned long mfn_save, mfn;
|
||||
unsigned long ident_pfn_iter, remap_pfn_iter;
|
||||
unsigned long ident_start_pfn_align, remap_start_pfn_align;
|
||||
unsigned long ident_end_pfn_align, remap_end_pfn_align;
|
||||
unsigned long ident_boundary_pfn, remap_boundary_pfn;
|
||||
unsigned long ident_cnt = 0;
|
||||
unsigned long remap_cnt = 0;
|
||||
unsigned long ident_end_pfn = start_pfn + size;
|
||||
unsigned long left = size;
|
||||
unsigned long mod;
|
||||
int i;
|
||||
unsigned long ident_cnt = 0;
|
||||
unsigned int i, chunk;
|
||||
|
||||
WARN_ON(size == 0);
|
||||
|
||||
BUG_ON(xen_feature(XENFEAT_auto_translated_physmap));
|
||||
|
||||
/*
|
||||
* Determine the proper alignment to remap memory in P2M_PER_PAGE sized
|
||||
* blocks. We need to keep track of both the existing pfn mapping and
|
||||
* the new pfn remapping.
|
||||
*/
|
||||
mod = start_pfn % P2M_PER_PAGE;
|
||||
ident_start_pfn_align =
|
||||
mod ? (start_pfn - mod + P2M_PER_PAGE) : start_pfn;
|
||||
mod = remap_pfn % P2M_PER_PAGE;
|
||||
remap_start_pfn_align =
|
||||
mod ? (remap_pfn - mod + P2M_PER_PAGE) : remap_pfn;
|
||||
mod = (start_pfn + size) % P2M_PER_PAGE;
|
||||
ident_end_pfn_align = start_pfn + size - mod;
|
||||
mod = (remap_pfn + size) % P2M_PER_PAGE;
|
||||
remap_end_pfn_align = remap_pfn + size - mod;
|
||||
mfn_save = virt_to_mfn(buf);
|
||||
|
||||
/* Iterate over each p2m leaf node in each range */
|
||||
for (ident_pfn_iter = ident_start_pfn_align, remap_pfn_iter = remap_start_pfn_align;
|
||||
ident_pfn_iter < ident_end_pfn_align && remap_pfn_iter < remap_end_pfn_align;
|
||||
ident_pfn_iter += P2M_PER_PAGE, remap_pfn_iter += P2M_PER_PAGE) {
|
||||
/* Check we aren't past the end */
|
||||
BUG_ON(ident_pfn_iter + P2M_PER_PAGE > start_pfn + size);
|
||||
BUG_ON(remap_pfn_iter + P2M_PER_PAGE > remap_pfn + size);
|
||||
for (ident_pfn_iter = start_pfn, remap_pfn_iter = remap_pfn;
|
||||
ident_pfn_iter < ident_end_pfn;
|
||||
ident_pfn_iter += REMAP_SIZE, remap_pfn_iter += REMAP_SIZE) {
|
||||
chunk = (left < REMAP_SIZE) ? left : REMAP_SIZE;
|
||||
|
||||
/* Save p2m mappings */
|
||||
for (i = 0; i < P2M_PER_PAGE; i++)
|
||||
xen_remap_buf[i] = pfn_to_mfn(ident_pfn_iter + i);
|
||||
/* Map first pfn to xen_remap_buf */
|
||||
mfn = pfn_to_mfn(ident_pfn_iter);
|
||||
set_pte_mfn(buf, mfn, PAGE_KERNEL);
|
||||
|
||||
/* Set identity map which will free a p2m leaf */
|
||||
/* Save mapping information in page */
|
||||
xen_remap_buf.next_area_mfn = xen_remap_mfn;
|
||||
xen_remap_buf.target_pfn = remap_pfn_iter;
|
||||
xen_remap_buf.size = chunk;
|
||||
for (i = 0; i < chunk; i++)
|
||||
xen_remap_buf.mfns[i] = pfn_to_mfn(ident_pfn_iter + i);
|
||||
|
||||
/* Put remap buf into list. */
|
||||
xen_remap_mfn = mfn;
|
||||
|
||||
/* Set identity map */
|
||||
ident_cnt += set_phys_range_identity(ident_pfn_iter,
|
||||
ident_pfn_iter + P2M_PER_PAGE);
|
||||
ident_pfn_iter + chunk);
|
||||
|
||||
#ifdef DEBUG
|
||||
/* Helps verify a p2m leaf has been freed */
|
||||
for (i = 0; i < P2M_PER_PAGE; i++) {
|
||||
unsigned int pfn = ident_pfn_iter + i;
|
||||
BUG_ON(pfn_to_mfn(pfn) != pfn);
|
||||
}
|
||||
#endif
|
||||
/* Now remap memory */
|
||||
for (i = 0; i < P2M_PER_PAGE; i++) {
|
||||
unsigned long mfn = xen_remap_buf[i];
|
||||
|
||||
/* This will use the p2m leaf freed above */
|
||||
if (!xen_update_mem_tables(remap_pfn_iter + i, mfn)) {
|
||||
WARN(1, "Failed to update mem mapping for pfn=%ld mfn=%ld\n",
|
||||
remap_pfn_iter + i, mfn);
|
||||
return 0;
|
||||
}
|
||||
|
||||
remap_cnt++;
|
||||
}
|
||||
|
||||
left -= P2M_PER_PAGE;
|
||||
left -= chunk;
|
||||
}
|
||||
|
||||
/* Max boundary space possible */
|
||||
BUG_ON(left > (P2M_PER_PAGE - 1) * 2);
|
||||
|
||||
/* Now handle the boundary conditions */
|
||||
ident_boundary_pfn = start_pfn;
|
||||
remap_boundary_pfn = remap_pfn;
|
||||
for (i = 0; i < left; i++) {
|
||||
unsigned long mfn;
|
||||
|
||||
/* These two checks move from the start to end boundaries */
|
||||
if (ident_boundary_pfn == ident_start_pfn_align)
|
||||
ident_boundary_pfn = ident_pfn_iter;
|
||||
if (remap_boundary_pfn == remap_start_pfn_align)
|
||||
remap_boundary_pfn = remap_pfn_iter;
|
||||
|
||||
/* Check we aren't past the end */
|
||||
BUG_ON(ident_boundary_pfn >= start_pfn + size);
|
||||
BUG_ON(remap_boundary_pfn >= remap_pfn + size);
|
||||
|
||||
mfn = pfn_to_mfn(ident_boundary_pfn);
|
||||
|
||||
if (!xen_update_mem_tables(remap_boundary_pfn, mfn)) {
|
||||
WARN(1, "Failed to update mem mapping for pfn=%ld mfn=%ld\n",
|
||||
remap_pfn_iter + i, mfn);
|
||||
return 0;
|
||||
}
|
||||
remap_cnt++;
|
||||
|
||||
ident_boundary_pfn++;
|
||||
remap_boundary_pfn++;
|
||||
}
|
||||
|
||||
/* Finish up the identity map */
|
||||
if (ident_start_pfn_align >= ident_end_pfn_align) {
|
||||
/*
|
||||
* In this case we have an identity range which does not span an
|
||||
* aligned block so everything needs to be identity mapped here.
|
||||
* If we didn't check this we might remap too many pages since
|
||||
* the align boundaries are not meaningful in this case.
|
||||
*/
|
||||
ident_cnt += set_phys_range_identity(start_pfn,
|
||||
start_pfn + size);
|
||||
} else {
|
||||
/* Remapped above so check each end of the chunk */
|
||||
if (start_pfn < ident_start_pfn_align)
|
||||
ident_cnt += set_phys_range_identity(start_pfn,
|
||||
ident_start_pfn_align);
|
||||
if (start_pfn + size > ident_pfn_iter)
|
||||
ident_cnt += set_phys_range_identity(ident_pfn_iter,
|
||||
start_pfn + size);
|
||||
}
|
||||
|
||||
BUG_ON(ident_cnt != size);
|
||||
BUG_ON(remap_cnt != size);
|
||||
|
||||
return size;
|
||||
/* Restore old xen_remap_buf mapping */
|
||||
set_pte_mfn(buf, mfn_save, PAGE_KERNEL);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -396,8 +371,7 @@ static unsigned long __init xen_do_set_identity_and_remap_chunk(
|
||||
static unsigned long __init xen_set_identity_and_remap_chunk(
|
||||
const struct e820entry *list, size_t map_size, unsigned long start_pfn,
|
||||
unsigned long end_pfn, unsigned long nr_pages, unsigned long remap_pfn,
|
||||
unsigned long *identity, unsigned long *remapped,
|
||||
unsigned long *released)
|
||||
unsigned long *identity, unsigned long *released)
|
||||
{
|
||||
unsigned long pfn;
|
||||
unsigned long i = 0;
|
||||
@ -431,19 +405,12 @@ static unsigned long __init xen_set_identity_and_remap_chunk(
|
||||
if (size > remap_range_size)
|
||||
size = remap_range_size;
|
||||
|
||||
if (!xen_do_set_identity_and_remap_chunk(cur_pfn, size, remap_pfn)) {
|
||||
WARN(1, "Failed to remap 1:1 memory cur_pfn=%ld size=%ld remap_pfn=%ld\n",
|
||||
cur_pfn, size, remap_pfn);
|
||||
xen_set_identity_and_release_chunk(cur_pfn,
|
||||
cur_pfn + left, nr_pages, identity, released);
|
||||
break;
|
||||
}
|
||||
xen_do_set_identity_and_remap_chunk(cur_pfn, size, remap_pfn);
|
||||
|
||||
/* Update variables to reflect new mappings. */
|
||||
i += size;
|
||||
remap_pfn += size;
|
||||
*identity += size;
|
||||
*remapped += size;
|
||||
}
|
||||
|
||||
/*
|
||||
@ -458,13 +425,12 @@ static unsigned long __init xen_set_identity_and_remap_chunk(
|
||||
return remap_pfn;
|
||||
}
|
||||
|
||||
static unsigned long __init xen_set_identity_and_remap(
|
||||
static void __init xen_set_identity_and_remap(
|
||||
const struct e820entry *list, size_t map_size, unsigned long nr_pages,
|
||||
unsigned long *released)
|
||||
{
|
||||
phys_addr_t start = 0;
|
||||
unsigned long identity = 0;
|
||||
unsigned long remapped = 0;
|
||||
unsigned long last_pfn = nr_pages;
|
||||
const struct e820entry *entry;
|
||||
unsigned long num_released = 0;
|
||||
@ -494,8 +460,7 @@ static unsigned long __init xen_set_identity_and_remap(
|
||||
last_pfn = xen_set_identity_and_remap_chunk(
|
||||
list, map_size, start_pfn,
|
||||
end_pfn, nr_pages, last_pfn,
|
||||
&identity, &remapped,
|
||||
&num_released);
|
||||
&identity, &num_released);
|
||||
start = end;
|
||||
}
|
||||
}
|
||||
@ -503,12 +468,63 @@ static unsigned long __init xen_set_identity_and_remap(
|
||||
*released = num_released;
|
||||
|
||||
pr_info("Set %ld page(s) to 1-1 mapping\n", identity);
|
||||
pr_info("Remapped %ld page(s), last_pfn=%ld\n", remapped,
|
||||
last_pfn);
|
||||
pr_info("Released %ld page(s)\n", num_released);
|
||||
|
||||
return last_pfn;
|
||||
}
|
||||
|
||||
/*
|
||||
* Remap the memory prepared in xen_do_set_identity_and_remap_chunk().
|
||||
* The remap information (which mfn remap to which pfn) is contained in the
|
||||
* to be remapped memory itself in a linked list anchored at xen_remap_mfn.
|
||||
* This scheme allows to remap the different chunks in arbitrary order while
|
||||
* the resulting mapping will be independant from the order.
|
||||
*/
|
||||
void __init xen_remap_memory(void)
|
||||
{
|
||||
unsigned long buf = (unsigned long)&xen_remap_buf;
|
||||
unsigned long mfn_save, mfn, pfn;
|
||||
unsigned long remapped = 0;
|
||||
unsigned int i;
|
||||
unsigned long pfn_s = ~0UL;
|
||||
unsigned long len = 0;
|
||||
|
||||
mfn_save = virt_to_mfn(buf);
|
||||
|
||||
while (xen_remap_mfn != INVALID_P2M_ENTRY) {
|
||||
/* Map the remap information */
|
||||
set_pte_mfn(buf, xen_remap_mfn, PAGE_KERNEL);
|
||||
|
||||
BUG_ON(xen_remap_mfn != xen_remap_buf.mfns[0]);
|
||||
|
||||
pfn = xen_remap_buf.target_pfn;
|
||||
for (i = 0; i < xen_remap_buf.size; i++) {
|
||||
mfn = xen_remap_buf.mfns[i];
|
||||
xen_update_mem_tables(pfn, mfn);
|
||||
remapped++;
|
||||
pfn++;
|
||||
}
|
||||
if (pfn_s == ~0UL || pfn == pfn_s) {
|
||||
pfn_s = xen_remap_buf.target_pfn;
|
||||
len += xen_remap_buf.size;
|
||||
} else if (pfn_s + len == xen_remap_buf.target_pfn) {
|
||||
len += xen_remap_buf.size;
|
||||
} else {
|
||||
xen_del_extra_mem(PFN_PHYS(pfn_s), PFN_PHYS(len));
|
||||
pfn_s = xen_remap_buf.target_pfn;
|
||||
len = xen_remap_buf.size;
|
||||
}
|
||||
|
||||
mfn = xen_remap_mfn;
|
||||
xen_remap_mfn = xen_remap_buf.next_area_mfn;
|
||||
}
|
||||
|
||||
if (pfn_s != ~0UL && len)
|
||||
xen_del_extra_mem(PFN_PHYS(pfn_s), PFN_PHYS(len));
|
||||
|
||||
set_pte_mfn(buf, mfn_save, PAGE_KERNEL);
|
||||
|
||||
pr_info("Remapped %ld page(s)\n", remapped);
|
||||
}
|
||||
|
||||
static unsigned long __init xen_get_max_pages(void)
|
||||
{
|
||||
unsigned long max_pages = MAX_DOMAIN_PAGES;
|
||||
@ -569,7 +585,6 @@ char * __init xen_memory_setup(void)
|
||||
int rc;
|
||||
struct xen_memory_map memmap;
|
||||
unsigned long max_pages;
|
||||
unsigned long last_pfn = 0;
|
||||
unsigned long extra_pages = 0;
|
||||
int i;
|
||||
int op;
|
||||
@ -616,17 +631,14 @@ char * __init xen_memory_setup(void)
|
||||
extra_pages += max_pages - max_pfn;
|
||||
|
||||
/*
|
||||
* Set identity map on non-RAM pages and remap the underlying RAM.
|
||||
* Set identity map on non-RAM pages and prepare remapping the
|
||||
* underlying RAM.
|
||||
*/
|
||||
last_pfn = xen_set_identity_and_remap(map, memmap.nr_entries, max_pfn,
|
||||
&xen_released_pages);
|
||||
xen_set_identity_and_remap(map, memmap.nr_entries, max_pfn,
|
||||
&xen_released_pages);
|
||||
|
||||
extra_pages += xen_released_pages;
|
||||
|
||||
if (last_pfn > max_pfn) {
|
||||
max_pfn = min(MAX_DOMAIN_PAGES, last_pfn);
|
||||
mem_end = PFN_PHYS(max_pfn);
|
||||
}
|
||||
/*
|
||||
* Clamp the amount of extra memory to a EXTRA_MEM_RATIO
|
||||
* factor the base size. On non-highmem systems, the base
|
||||
@ -653,6 +665,7 @@ char * __init xen_memory_setup(void)
|
||||
size = min(size, (u64)extra_pages * PAGE_SIZE);
|
||||
extra_pages -= size / PAGE_SIZE;
|
||||
xen_add_extra_mem(addr, size);
|
||||
xen_max_p2m_pfn = PFN_DOWN(addr + size);
|
||||
} else
|
||||
type = E820_UNUSABLE;
|
||||
}
|
||||
|
||||
@ -29,11 +29,13 @@ void xen_build_mfn_list_list(void);
|
||||
void xen_setup_machphys_mapping(void);
|
||||
void xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn);
|
||||
void xen_reserve_top(void);
|
||||
extern unsigned long xen_max_p2m_pfn;
|
||||
|
||||
void xen_mm_pin_all(void);
|
||||
void xen_mm_unpin_all(void);
|
||||
|
||||
unsigned long __ref xen_chk_extra_mem(unsigned long pfn);
|
||||
void __init xen_inv_extra_mem(void);
|
||||
void __init xen_remap_memory(void);
|
||||
char * __init xen_memory_setup(void);
|
||||
char * xen_auto_xlated_memory_setup(void);
|
||||
void __init xen_arch_setup(void);
|
||||
@ -46,7 +48,7 @@ void xen_hvm_init_shared_info(void);
|
||||
void xen_unplug_emulated_devices(void);
|
||||
|
||||
void __init xen_build_dynamic_phys_to_machine(void);
|
||||
unsigned long __init xen_revector_p2m_tree(void);
|
||||
void __init xen_vmalloc_p2m_tree(void);
|
||||
|
||||
void xen_init_irq_ops(void);
|
||||
void xen_setup_timer(int cpu);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user