xen: make sure stray alias mappings are gone before pinning
Xen requires that all mappings of pagetable pages are read-only, so that they can't be updated illegally. As a result, if a page is being turned into a pagetable page, we need to make sure all its mappings are RO. If the page had been used for ioremap or vmalloc, it may still have left over mappings as a result of not having been lazily unmapped. This change makes sure we explicitly mop them all up before pinning the page. Unlike aliases created by kmap, the there can be vmalloc aliases even for non-high pages, so we must do the flush unconditionally. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Linux Memory Management List <linux-mm@kvack.org> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -863,15 +863,16 @@ static void xen_alloc_ptpage(struct mm_struct *mm, unsigned long pfn, unsigned l
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if (PagePinned(virt_to_page(mm->pgd))) {
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SetPagePinned(page);
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vm_unmap_aliases();
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if (!PageHighMem(page)) {
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make_lowmem_page_readonly(__va(PFN_PHYS((unsigned long)pfn)));
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if (level == PT_PTE && USE_SPLIT_PTLOCKS)
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pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
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} else
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} else {
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/* make sure there are no stray mappings of
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this page */
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kmap_flush_unused();
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vm_unmap_aliases();
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}
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}
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}
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@ -850,13 +850,16 @@ static int xen_pin_page(struct mm_struct *mm, struct page *page,
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read-only, and can be pinned. */
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static void __xen_pgd_pin(struct mm_struct *mm, pgd_t *pgd)
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{
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vm_unmap_aliases();
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xen_mc_batch();
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if (xen_pgd_walk(mm, xen_pin_page, USER_LIMIT)) {
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/* re-enable interrupts for kmap_flush_unused */
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if (xen_pgd_walk(mm, xen_pin_page, USER_LIMIT)) {
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/* re-enable interrupts for flushing */
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xen_mc_issue(0);
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kmap_flush_unused();
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vm_unmap_aliases();
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xen_mc_batch();
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}
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