kevin/linux
1
Fork 0
Code

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

Browse Source 
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.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Lu Baolu 2024-07-02 21:08:35 +08:00 committed by Will Deacon
parent 5fbf97371d
commit e995fcde60
4 changed files with 4 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/iommu/intel/iommu.c
View File

@ -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;
}

6
drivers/iommu/intel/iommu.h
View File

@ -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
}

1
drivers/iommu/intel/pasid.c
View File

@ -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);

10
drivers/iommu/intel/pasid.h
View File

@ -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.