iommu/vt-d: Preset A/D bits for user space DMA usage

We preset the access and dirty bits for IOVA over first level usage only
for the kernel DMA (i.e., when domain type is IOMMU_DOMAIN_DMA). We should
also preset the FL A/D for user space DMA usage. The idea is that even the
user space A/D bit memory write is unnecessary. We should avoid it to
minimize the overhead.

Suggested-by: Sanjay Kumar <[email protected]>
Signed-off-by: Lu Baolu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>

Author: LuBaolu

drivers/iommu/intel/iommu.c

@@ -2334,13 +2334,9 @@ __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
 	attr = prot & (DMA_PTE_READ | DMA_PTE_WRITE | DMA_PTE_SNP);
 	attr |= DMA_FL_PTE_PRESENT;
 	if (domain_use_first_level(domain)) {
-		attr |= DMA_FL_PTE_XD | DMA_FL_PTE_US;
-
-		if (iommu_is_dma_domain(&domain->domain)) {
-			attr |= DMA_FL_PTE_ACCESS;
-			if (prot & DMA_PTE_WRITE)
-				attr |= DMA_FL_PTE_DIRTY;
-		}
+		attr |= DMA_FL_PTE_XD | DMA_FL_PTE_US | DMA_FL_PTE_ACCESS;
+		if (prot & DMA_PTE_WRITE)
+			attr |= DMA_FL_PTE_DIRTY;
 	}
 
 	pteval = ((phys_addr_t)phys_pfn << VTD_PAGE_SHIFT) | attr;