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intel-iommu: Fix address wrap on 32-bit kernel.

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The problem is in dma_pte_clear_range and dma_pte_free_pagetable. When
intel_unmap_single and intel_unmap_sg call them, the end address may be
zero if the 'start_addr + size' rounds up. So no PTE gets cleared. The
uncleared PTE fires the BUG_ON when it's used again to create new mappings.

After I modified dma_pte_clear_range a bit, the BUG_ON is gone.

Tested both 32 and 32 PAE modes on Intel X58 and Q35 platforms.

Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Zhao, Yu 2009-02-13 17:55:49 +08:00 committed by David Woodhouse
parent 4cf2e75d0b
commit afeeb7cebb
1 changed files with 3 additions and 1 deletions
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4
drivers/pci/intel-iommu.c
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@ -718,15 +718,17 @@ static void dma_pte_clear_one(struct dmar_domain *domain, u64 addr)
static void dma_pte_clear_range(struct dmar_domain *domain, u64 start, u64 end)
{
int addr_width = agaw_to_width(domain->agaw);
int npages;
start &= (((u64)1) << addr_width) - 1;
end &= (((u64)1) << addr_width) - 1;
/* in case it's partial page */
start = PAGE_ALIGN(start);
end &= PAGE_MASK;
npages = (end - start) / VTD_PAGE_SIZE;
/* we don't need lock here, nobody else touches the iova range */
while (start < end) {
while (npages--) {
dma_pte_clear_one(domain, start);
start += VTD_PAGE_SIZE;
}