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xen/p2m: Use SetPagePrivate and its friends for M2P overrides. 

We use the page->private field and hence should use the proper
macros and set proper bits. Also WARN_ON in case somebody
tries to overwrite our data.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2011-09-23 17:36:07 -04:00
parent a867db10e8
commit 0f4b49eaf2
1 changed files with 6 additions and 4 deletions
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10
arch/x86/xen/p2m.c
View File

@ -692,8 +692,9 @@ int m2p_add_override(unsigned long mfn, struct page *page, bool clear_pte)
"m2p_add_override: pfn %lx not mapped", pfn)) "m2p_add_override: pfn %lx not mapped", pfn))
return -EINVAL; return -EINVAL;
} }
WARN_ON(PagePrivate(page));
page->private = mfn; SetPagePrivate(page);
set_page_private(page, mfn);
page->index = pfn_to_mfn(pfn); page->index = pfn_to_mfn(pfn);
if (unlikely(!set_phys_to_machine(pfn, FOREIGN_FRAME(mfn)))) if (unlikely(!set_phys_to_machine(pfn, FOREIGN_FRAME(mfn))))
@ -736,7 +737,8 @@ int m2p_remove_override(struct page *page, bool clear_pte)
list_del(&page->lru); list_del(&page->lru);
spin_unlock_irqrestore(&m2p_override_lock, flags); spin_unlock_irqrestore(&m2p_override_lock, flags);
set_phys_to_machine(pfn, page->index); set_phys_to_machine(pfn, page->index);
WARN_ON(!PagePrivate(page));
ClearPagePrivate(page);
if (clear_pte && !PageHighMem(page)) if (clear_pte && !PageHighMem(page))
set_pte_at(&init_mm, address, ptep, set_pte_at(&init_mm, address, ptep,
pfn_pte(pfn, PAGE_KERNEL)); pfn_pte(pfn, PAGE_KERNEL));
@ -758,7 +760,7 @@ struct page *m2p_find_override(unsigned long mfn)
spin_lock_irqsave(&m2p_override_lock, flags); spin_lock_irqsave(&m2p_override_lock, flags);
list_for_each_entry(p, bucket, lru) { list_for_each_entry(p, bucket, lru) {
if (p->private == mfn) { if (page_private(p) == mfn) {
ret = p; ret = p;
break; break;
} }