From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
In m2p_add_override store the original mfn into page->index and then
change the p2m mapping, setting mfns as FOREIGN_FRAME.
In m2p_remove_override restore the original mapping.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
arch/x86/xen/p2m.c | 12 ++++++++++++
1 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index 8db19d5..b3b19d4 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -407,8 +407,11 @@ static unsigned long mfn_hash(unsigned long mfn)
void m2p_add_override(unsigned long mfn, struct page *page)
{
unsigned long flags;
+ unsigned long pfn = page_to_pfn(page);
page->private = mfn;
+ page->index = pfn_to_mfn(pfn);
+ __set_phys_to_machine(pfn, FOREIGN_FRAME(mfn));
spin_lock_irqsave(&m2p_override_lock, flags);
list_add(&page->lru, &m2p_overrides[mfn_hash(mfn)]);
spin_unlock_irqrestore(&m2p_override_lock, flags);
@@ -417,9 +420,18 @@ void m2p_add_override(unsigned long mfn, struct page *page)
void m2p_remove_override(struct page *page)
{
unsigned long flags;
+ unsigned long mfn;
+ unsigned long pfn;
+
+ pfn = page_to_pfn(page);
+ mfn = get_phys_to_machine(pfn);
+ if (mfn == INVALID_P2M_ENTRY || !(mfn & FOREIGN_FRAME_BIT))
+ return;
+
spin_lock_irqsave(&m2p_override_lock, flags);
list_del(&page->lru);
spin_unlock_irqrestore(&m2p_override_lock, flags);
+ __set_phys_to_machine(pfn, page->index);
}
struct page *m2p_find_override(unsigned long mfn)
--
1.5.6.5
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