Commit 53fc7ad6 authored by Lu Baolu's avatar Lu Baolu Committed by Joerg Roedel

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: b802d070 ("iommu/vt-d: Use iova over first level")
Cc: stable@vger.kernel.org
Signed-off-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20220817023558.3253263-1-baolu.lu@linux.intel.comSigned-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 0c5f6c0d
...@@ -390,14 +390,36 @@ static inline int domain_pfn_supported(struct dmar_domain *domain, ...@@ -390,14 +390,36 @@ static inline int domain_pfn_supported(struct dmar_domain *domain,
return !(addr_width < BITS_PER_LONG && pfn >> addr_width); 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) static int __iommu_calculate_agaw(struct intel_iommu *iommu, int max_gaw)
{ {
unsigned long sagaw; unsigned long sagaw;
int agaw; int agaw;
sagaw = cap_sagaw(iommu->cap); sagaw = __iommu_calculate_sagaw(iommu);
for (agaw = width_to_agaw(max_gaw); for (agaw = width_to_agaw(max_gaw); agaw >= 0; agaw--) {
agaw >= 0; agaw--) {
if (test_bit(agaw, &sagaw)) if (test_bit(agaw, &sagaw))
break; break;
} }
......
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