summaryrefslogtreecommitdiff
path: root/drivers/iommu
diff options
context:
space:
mode:
authorLu Baolu <baolu.lu@linux.intel.com>2022-08-23 09:15:55 +0300
committerJoerg Roedel <jroedel@suse.de>2022-09-07 16:14:56 +0300
commit53fc7ad6edf210b497230ce74b61b322a202470c (patch)
treea6339ee620841a793f8bad9a50b3d8a8f9a239df /drivers/iommu
parent0c5f6c0d8201a809a6585b07b6263e9db2c874a3 (diff)
downloadlinux-53fc7ad6edf210b497230ce74b61b322a202470c.tar.xz
iommu/vt-d: Correctly calculate sagaw value of IOMMU
The Intel IOMMU driver possibly selects between the first-level and the second-level translation tables for DMA address translation. However, the levels of page-table walks for the 4KB base page size are calculated from the SAGAW field of the capability register, which is only valid for the second-level page table. This causes the IOMMU driver to stop working if the hardware (or the emulated IOMMU) advertises only first-level translation capability and reports the SAGAW field as 0. This solves the above problem by considering both the first level and the second level when calculating the supported page table levels. Fixes: b802d070a52a1 ("iommu/vt-d: Use iova over first level") Cc: stable@vger.kernel.org Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Link: https://lore.kernel.org/r/20220817023558.3253263-1-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/intel/iommu.c28
1 files changed, 25 insertions, 3 deletions
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index b9d058c27568..b155c7af7d15 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -390,14 +390,36 @@ static inline int domain_pfn_supported(struct dmar_domain *domain,
return !(addr_width < BITS_PER_LONG && pfn >> addr_width);
}
+/*
+ * Calculate the Supported Adjusted Guest Address Widths of an IOMMU.
+ * Refer to 11.4.2 of the VT-d spec for the encoding of each bit of
+ * the returned SAGAW.
+ */
+static unsigned long __iommu_calculate_sagaw(struct intel_iommu *iommu)
+{
+ unsigned long fl_sagaw, sl_sagaw;
+
+ fl_sagaw = BIT(2) | (cap_fl1gp_support(iommu->cap) ? BIT(3) : 0);
+ sl_sagaw = cap_sagaw(iommu->cap);
+
+ /* Second level only. */
+ if (!sm_supported(iommu) || !ecap_flts(iommu->ecap))
+ return sl_sagaw;
+
+ /* First level only. */
+ if (!ecap_slts(iommu->ecap))
+ return fl_sagaw;
+
+ return fl_sagaw & sl_sagaw;
+}
+
static int __iommu_calculate_agaw(struct intel_iommu *iommu, int max_gaw)
{
unsigned long sagaw;
int agaw;
- sagaw = cap_sagaw(iommu->cap);
- for (agaw = width_to_agaw(max_gaw);
- agaw >= 0; agaw--) {
+ sagaw = __iommu_calculate_sagaw(iommu);
+ for (agaw = width_to_agaw(max_gaw); agaw >= 0; agaw--) {
if (test_bit(agaw, &sagaw))
break;
}