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intel-iommu: Fix reference by physical address in intel_iommu_attach_device() 

Commit a99c47a2 "intel-iommu: errors with smaller iommu widths" replace the
dmar_domain->pgd with the first entry of page table when iommu's supported
width is smaller than dmar_domain's. But it use physical address directly
for new dmar_domain->pgd...

This result in KVM oops with VT-d on some machines.

Reported-by: Allen Kay <allen.m.kay@intel.com>
Cc: Tom Lyon <pugs@cisco.com>
Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Sheng Yang 2010-06-12 19:21:42 +08:00 committed by David Woodhouse
parent 7e27d6e778
commit 25cbff1660
1 changed files with 2 additions and 1 deletions
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3
drivers/pci/intel-iommu.c
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@ -3603,7 +3603,8 @@ static int intel_iommu_attach_device(struct iommu_domain *domain,
pte = dmar_domain->pgd;
if (dma_pte_present(pte)) {
free_pgtable_page(dmar_domain->pgd);
dmar_domain->pgd = (struct dma_pte *)dma_pte_addr(pte);
dmar_domain->pgd = (struct dma_pte *)
phys_to_virt(dma_pte_addr(pte));
}
dmar_domain->agaw--;
}