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intel-iommu: fix superpage support in pfn_to_dma_pte() 

If target_level == 0, current code breaks out of the while-loop if
SUPERPAGE bit is set. We should also break out if PTE is not present.
If we don't do this, KVM calls to iommu_iova_to_phys() will cause
pfn_to_dma_pte() to create mapping for 4KiB pages.

Signed-off-by: Allen Kay <allen.m.kay@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Allen Kay 2011-10-14 12:32:46 -07:00 committed by David Woodhouse
parent 8140a95d22
commit 4399c8bf2b
1 changed files with 8 additions and 9 deletions
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17
drivers/iommu/intel-iommu.c
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@ -306,6 +306,11 @@ static inline bool dma_pte_present(struct dma_pte *pte)
return (pte->val & 3) != 0;
}
static inline bool dma_pte_superpage(struct dma_pte *pte)
{
return (pte->val & (1 << 7));
}
static inline int first_pte_in_page(struct dma_pte *pte)
{
return !((unsigned long)pte & ~VTD_PAGE_MASK);
@ -734,29 +739,23 @@ out:
}
static struct dma_pte *pfn_to_dma_pte(struct dmar_domain *domain,
unsigned long pfn, int large_level)
unsigned long pfn, int target_level)
{
int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT;
struct dma_pte *parent, *pte = NULL;
int level = agaw_to_level(domain->agaw);
int offset, target_level;
int offset;
BUG_ON(!domain->pgd);
BUG_ON(addr_width < BITS_PER_LONG && pfn >> addr_width);
parent = domain->pgd;
/* Search pte */
if (!large_level)
target_level = 1;
else
target_level = large_level;
while (level > 0) {
void *tmp_page;
offset = pfn_level_offset(pfn, level);
pte = &parent[offset];
if (!large_level && (pte->val & DMA_PTE_LARGE_PAGE))
if (!target_level && (dma_pte_superpage(pte) || !dma_pte_present(pte)))
break;
if (level == target_level)
break;