diff options
| author | Lu Baolu <baolu.lu@linux.intel.com> | 2023-10-25 21:42:16 -0700 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2023-10-26 11:16:34 -0300 |
| commit | 03476e687eb07b94f7cdb07cd3c7c4304b6c58b3 (patch) | |
| tree | d0bbe96bfb768815520c4131006e9b7032f5eb33 /drivers/iommu/intel/iommu.c | |
| parent | b41e38e225398191aaa0f1115d6234f57ffd0741 (diff) | |
iommu/vt-d: Disallow read-only mappings to nest parent domain
When remapping hardware is configured by system software in scalable mode
as Nested (PGTT=011b) and with PWSNP field Set in the PASID-table-entry,
it may Set Accessed bit and Dirty bit (and Extended Access bit if enabled)
in first-stage page-table entries even when second-stage mappings indicate
that corresponding first-stage page-table is Read-Only.
As the result, contents of pages designated by VMM as Read-Only can be
modified by IOMMU via PML5E (PML4E for 4-level tables) access as part of
address translation process due to DMAs issued by Guest.
This disallows read-only mappings in the domain that is supposed to be used
as nested parent. Reference from Sapphire Rapids Specification Update [1],
errata details, SPR17. Userspace should know this limitation by checking
the IOMMU_HW_INFO_VTD_ERRATA_772415_SPR17 flag reported in the IOMMU_GET_HW_INFO
ioctl.
[1] https://www.intel.com/content/www/us/en/content-details/772415/content-details.html
Link: https://lore.kernel.org/r/20231026044216.64964-9-yi.l.liu@intel.com
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'drivers/iommu/intel/iommu.c')
| -rw-r--r-- | drivers/iommu/intel/iommu.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 4ce372d5d4f3..a2c429855cc0 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -2194,6 +2194,11 @@ __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn, if ((prot & (DMA_PTE_READ|DMA_PTE_WRITE)) == 0) return -EINVAL; + if (!(prot & DMA_PTE_WRITE) && domain->nested_parent) { + pr_err_ratelimited("Read-only mapping is disallowed on the domain which serves as the parent in a nested configuration, due to HW errata (ERRATA_772415_SPR17)\n"); + return -EINVAL; + } + attr = prot & (DMA_PTE_READ | DMA_PTE_WRITE | DMA_PTE_SNP); attr |= DMA_FL_PTE_PRESENT; if (domain->use_first_level) { @@ -4850,6 +4855,7 @@ static void *intel_iommu_hw_info(struct device *dev, u32 *length, u32 *type) if (!vtd) return ERR_PTR(-ENOMEM); + vtd->flags = IOMMU_HW_INFO_VTD_ERRATA_772415_SPR17; vtd->cap_reg = iommu->cap; vtd->ecap_reg = iommu->ecap; *length = sizeof(*vtd); |