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xen/p2m: Allocate p2m tracking pages on override 

It is possible to add a p2m override on pages that are currently mapped
to INVALID_P2M_ENTRY; in particular, this will happen when using
ballooned pages in gntdev. This means that set_phys_to_machine must be
used instead of __set_phys_to_machine.

Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Daniel De Graaf 2011-03-24 08:10:07 -04:00 committed by Konrad Rzeszutek Wilk
parent a93e20a830
commit b254244d26
1 changed files with 4 additions and 2 deletions
arch/x86/xen
p2m.c

6
arch/x86/xen/p2m.c
View File

@ -671,7 +671,9 @@ int m2p_add_override(unsigned long mfn, struct page *page)
page->private = mfn; page->private = mfn;
page->index = pfn_to_mfn(pfn); page->index = pfn_to_mfn(pfn);
__set_phys_to_machine(pfn, FOREIGN_FRAME(mfn)); if (unlikely(!set_phys_to_machine(pfn, FOREIGN_FRAME(mfn))))
return -ENOMEM;
if (!PageHighMem(page)) if (!PageHighMem(page))
/* Just zap old mapping for now */ /* Just zap old mapping for now */
pte_clear(&init_mm, address, ptep); pte_clear(&init_mm, address, ptep);
@ -709,7 +711,7 @@ int m2p_remove_override(struct page *page)
spin_lock_irqsave(&m2p_override_lock, flags); spin_lock_irqsave(&m2p_override_lock, flags);
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);
if (!PageHighMem(page)) if (!PageHighMem(page))
set_pte_at(&init_mm, address, ptep, set_pte_at(&init_mm, address, ptep,