diff options
Diffstat (limited to 'hw/i386/intel_iommu.c')
| -rw-r--r-- | hw/i386/intel_iommu.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index bd6de71c02..3959fe44c7 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -1824,6 +1824,7 @@ static const bool vtd_qualified_faults[] = { [VTD_FR_FS_PAGING_ENTRY_P] = true, [VTD_FR_FS_PAGING_ENTRY_RSVD] = true, [VTD_FR_PASID_ENTRY_FSPTPTR_INV] = true, + [VTD_FR_FS_NON_CANONICAL] = true, [VTD_FR_FS_PAGING_ENTRY_US] = true, [VTD_FR_SM_WRITE] = true, [VTD_FR_SM_INTERRUPT_ADDR] = true, @@ -1930,6 +1931,22 @@ static inline bool vtd_flpte_present(uint64_t flpte) return !!(flpte & VTD_FL_P); } +/* Return true if IOVA is canonical, otherwise false. */ +static bool vtd_iova_fl_check_canonical(IntelIOMMUState *s, uint64_t iova, + VTDContextEntry *ce, uint32_t pasid) +{ + uint64_t iova_limit = vtd_iova_limit(s, ce, s->aw_bits, pasid); + uint64_t upper_bits_mask = ~(iova_limit - 1); + uint64_t upper_bits = iova & upper_bits_mask; + bool msb = ((iova & (iova_limit >> 1)) != 0); + + if (msb) { + return upper_bits == upper_bits_mask; + } else { + return !upper_bits; + } +} + /* * Given the @iova, get relevant @flptep. @flpte_level will be the last level * of the translation, can be used for deciding the size of large page. @@ -1945,6 +1962,12 @@ static int vtd_iova_to_flpte(IntelIOMMUState *s, VTDContextEntry *ce, uint32_t offset; uint64_t flpte; + if (!vtd_iova_fl_check_canonical(s, iova, ce, pasid)) { + error_report_once("%s: detected non canonical IOVA (iova=0x%" PRIx64 "," + "pasid=0x%" PRIx32 ")", __func__, iova, pasid); + return -VTD_FR_FS_NON_CANONICAL; + } + while (true) { offset = vtd_iova_level_offset(iova, level); flpte = vtd_get_pte(addr, offset); |