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ce0fa3e56a
Speculative processor accesses may reference any memory that has a valid page table entry. While a speculative access won't generate a machine check, it will log the error in a machine check bank. That could cause escalation of a subsequent error since the overflow bit will be then set in the machine check bank status register. Code has to be double-plus-tricky to avoid mentioning the 1:1 virtual address of the page we want to map out otherwise we may trigger the very problem we are trying to avoid. We use a non-canonical address that passes through the usual Linux table walking code to get to the same "pte". Thanks to Dave Hansen for reviewing several iterations of this. Also see: http://marc.info/?l=linux-mm&m=149860136413338&w=2 Signed-off-by: Tony Luck <tony.luck@intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Borislav Petkov <bp@suse.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Elliott, Robert (Persistent Memory) <elliott@hpe.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-mm@kvack.org Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/20170816171803.28342-1-tony.luck@intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
136 lines
3.5 KiB
C
136 lines
3.5 KiB
C
#ifndef LINUX_MM_INLINE_H
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#define LINUX_MM_INLINE_H
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#include <linux/huge_mm.h>
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#include <linux/swap.h>
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/**
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* page_is_file_cache - should the page be on a file LRU or anon LRU?
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* @page: the page to test
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*
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* Returns 1 if @page is page cache page backed by a regular filesystem,
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* or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed.
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* Used by functions that manipulate the LRU lists, to sort a page
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* onto the right LRU list.
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*
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* We would like to get this info without a page flag, but the state
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* needs to survive until the page is last deleted from the LRU, which
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* could be as far down as __page_cache_release.
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*/
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static inline int page_is_file_cache(struct page *page)
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{
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return !PageSwapBacked(page);
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}
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static __always_inline void __update_lru_size(struct lruvec *lruvec,
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enum lru_list lru, enum zone_type zid,
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int nr_pages)
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{
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struct pglist_data *pgdat = lruvec_pgdat(lruvec);
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__mod_node_page_state(pgdat, NR_LRU_BASE + lru, nr_pages);
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__mod_zone_page_state(&pgdat->node_zones[zid],
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NR_ZONE_LRU_BASE + lru, nr_pages);
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}
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static __always_inline void update_lru_size(struct lruvec *lruvec,
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enum lru_list lru, enum zone_type zid,
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int nr_pages)
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{
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__update_lru_size(lruvec, lru, zid, nr_pages);
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#ifdef CONFIG_MEMCG
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mem_cgroup_update_lru_size(lruvec, lru, zid, nr_pages);
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#endif
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}
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static __always_inline void add_page_to_lru_list(struct page *page,
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struct lruvec *lruvec, enum lru_list lru)
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{
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update_lru_size(lruvec, lru, page_zonenum(page), hpage_nr_pages(page));
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list_add(&page->lru, &lruvec->lists[lru]);
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}
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static __always_inline void add_page_to_lru_list_tail(struct page *page,
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struct lruvec *lruvec, enum lru_list lru)
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{
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update_lru_size(lruvec, lru, page_zonenum(page), hpage_nr_pages(page));
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list_add_tail(&page->lru, &lruvec->lists[lru]);
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}
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static __always_inline void del_page_from_lru_list(struct page *page,
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struct lruvec *lruvec, enum lru_list lru)
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{
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list_del(&page->lru);
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update_lru_size(lruvec, lru, page_zonenum(page), -hpage_nr_pages(page));
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}
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/**
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* page_lru_base_type - which LRU list type should a page be on?
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* @page: the page to test
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*
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* Used for LRU list index arithmetic.
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*
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* Returns the base LRU type - file or anon - @page should be on.
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*/
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static inline enum lru_list page_lru_base_type(struct page *page)
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{
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if (page_is_file_cache(page))
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return LRU_INACTIVE_FILE;
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return LRU_INACTIVE_ANON;
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}
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/**
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* page_off_lru - which LRU list was page on? clearing its lru flags.
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* @page: the page to test
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*
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* Returns the LRU list a page was on, as an index into the array of LRU
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* lists; and clears its Unevictable or Active flags, ready for freeing.
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*/
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static __always_inline enum lru_list page_off_lru(struct page *page)
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{
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enum lru_list lru;
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if (PageUnevictable(page)) {
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__ClearPageUnevictable(page);
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lru = LRU_UNEVICTABLE;
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} else {
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lru = page_lru_base_type(page);
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if (PageActive(page)) {
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__ClearPageActive(page);
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lru += LRU_ACTIVE;
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}
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}
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return lru;
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}
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/**
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* page_lru - which LRU list should a page be on?
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* @page: the page to test
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*
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* Returns the LRU list a page should be on, as an index
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* into the array of LRU lists.
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*/
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static __always_inline enum lru_list page_lru(struct page *page)
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{
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enum lru_list lru;
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if (PageUnevictable(page))
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lru = LRU_UNEVICTABLE;
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else {
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lru = page_lru_base_type(page);
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if (PageActive(page))
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lru += LRU_ACTIVE;
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}
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return lru;
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}
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#define lru_to_page(head) (list_entry((head)->prev, struct page, lru))
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#ifdef arch_unmap_kpfn
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extern void arch_unmap_kpfn(unsigned long pfn);
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#else
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static __always_inline void arch_unmap_kpfn(unsigned long pfn) { }
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#endif
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#endif
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