iommu/vt-d: Remove control over Execute-Requested requests

The VT-d specification has removed architectural support of the requests
with pasid with a value of 1 for Execute-Requested (ER). And the NXE bit
in the pasid table entry and XD bit in the first-stage paging Entries are
deprecated accordingly.

Remove the programming of these bits to make it consistent with the spec.
Suggested-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20240624032351.249858-1-baolu.lu@linux.intel.com
Link: https://lore.kernel.org/r/20240702130839.108139-4-baolu.lu@linux.intel.comSigned-off-by: Will Deacon <will@kernel.org>

drivers/iommu/intel/iommu.c

@@ -854,7 +854,7 @@ static struct dma_pte *pfn_to_dma_pte(struct dmar_domain *domain,
 			domain_flush_cache(domain, tmp_page, VTD_PAGE_SIZE);
 			pteval = ((uint64_t)virt_to_dma_pfn(tmp_page) << VTD_PAGE_SHIFT) | DMA_PTE_READ | DMA_PTE_WRITE;
 			if (domain->use_first_level)
-				pteval |= DMA_FL_PTE_XD | DMA_FL_PTE_US | DMA_FL_PTE_ACCESS;
+				pteval |= DMA_FL_PTE_US | DMA_FL_PTE_ACCESS;
 
 			tmp = 0ULL;
 			if (!try_cmpxchg64(&pte->val, &tmp, pteval))
@@ -1872,7 +1872,7 @@ __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) {
-		attr |= DMA_FL_PTE_XD | DMA_FL_PTE_US | DMA_FL_PTE_ACCESS;
+		attr |= DMA_FL_PTE_US | DMA_FL_PTE_ACCESS;
 		if (prot & DMA_PTE_WRITE)
 			attr |= DMA_FL_PTE_DIRTY;
 	}

drivers/iommu/intel/iommu.h

@@ -49,7 +49,6 @@
 #define DMA_FL_PTE_US		BIT_ULL(2)
 #define DMA_FL_PTE_ACCESS	BIT_ULL(5)
 #define DMA_FL_PTE_DIRTY	BIT_ULL(6)
-#define DMA_FL_PTE_XD		BIT_ULL(63)
 
 #define DMA_SL_PTE_DIRTY_BIT	9
 #define DMA_SL_PTE_DIRTY	BIT_ULL(DMA_SL_PTE_DIRTY_BIT)
@@ -831,11 +830,10 @@ static inline void dma_clear_pte(struct dma_pte *pte)
 static inline u64 dma_pte_addr(struct dma_pte *pte)
 {
 #ifdef CONFIG_64BIT
-	return pte->val & VTD_PAGE_MASK & (~DMA_FL_PTE_XD);
+	return pte->val & VTD_PAGE_MASK;
 #else
 	/* Must have a full atomic 64-bit read */
-	return  __cmpxchg64(&pte->val, 0ULL, 0ULL) &
-			VTD_PAGE_MASK & (~DMA_FL_PTE_XD);
+	return  __cmpxchg64(&pte->val, 0ULL, 0ULL) & VTD_PAGE_MASK;
 #endif
 }
 

drivers/iommu/intel/pasid.c

@@ -336,7 +336,6 @@ int intel_pasid_setup_first_level(struct intel_iommu *iommu,
 	pasid_set_domain_id(pte, did);
 	pasid_set_address_width(pte, iommu->agaw);
 	pasid_set_page_snoop(pte, !!ecap_smpwc(iommu->ecap));
-	pasid_set_nxe(pte);
 
 	/* Setup Present and PASID Granular Transfer Type: */
 	pasid_set_translation_type(pte, PASID_ENTRY_PGTT_FL_ONLY);

drivers/iommu/intel/pasid.h

@@ -247,16 +247,6 @@ static inline void pasid_set_page_snoop(struct pasid_entry *pe, bool value)
 	pasid_set_bits(&pe->val[1], 1 << 23, value << 23);
 }
 
-/*
- * Setup No Execute Enable bit (Bit 133) of a scalable mode PASID
- * entry. It is required when XD bit of the first level page table
- * entry is about to be set.
- */
-static inline void pasid_set_nxe(struct pasid_entry *pe)
-{
-	pasid_set_bits(&pe->val[2], 1 << 5, 1 << 5);
-}
-
 /*
  * Setup the Page Snoop (PGSNP) field (Bit 88) of a scalable mode
  * PASID entry.