Commit 38a76eee authored by Joerg Roedel's avatar Joerg Roedel
Browse files

x86/amd-iommu: Use fetch_pte in iommu_unmap_page 



Instead of reimplementing existing logic use fetch_pte to
walk the page table in iommu_unmap_page.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 9355a081

arch/x86/kernel/amd_iommu.c

+3 −16
Original line number Diff line number Diff line
@@ -546,22 +546,9 @@ static int iommu_map_page(struct protection_domain *dom, 
static void iommu_unmap_page(struct protection_domain *dom,

			     unsigned long bus_addr)

{

	u64 *pte;



	pte = &dom->pt_root[IOMMU_PTE_L2_INDEX(bus_addr)];



	if (!IOMMU_PTE_PRESENT(*pte))

		return;



	pte = IOMMU_PTE_PAGE(*pte);

	pte = &pte[IOMMU_PTE_L1_INDEX(bus_addr)];



	if (!IOMMU_PTE_PRESENT(*pte))

		return;



	pte = IOMMU_PTE_PAGE(*pte);

	pte = &pte[IOMMU_PTE_L1_INDEX(bus_addr)];

	u64 *pte = fetch_pte(dom, bus_addr);



	if (pte)

		*pte = 0;

}