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authorLu Baolu <baolu.lu@linux.intel.com>2021-10-14 07:38:34 +0200
committerJoerg Roedel <jroedel@suse.de>2021-10-18 12:31:48 +0200
commit7afd7f6aa21a2929aff3a059b741933ee1819c6b (patch)
tree4379bf76741627358ad42d1af8e80a9a23266d8f /drivers/iommu
parentiommu/vt-d: Remove duplicate identity domain flag (diff)
downloadlinux-7afd7f6aa21a2929aff3a059b741933ee1819c6b.tar.xz
linux-7afd7f6aa21a2929aff3a059b741933ee1819c6b.zip
iommu/vt-d: Check FL and SL capability sanity in scalable mode
An iommu domain could be allocated and mapped before it's attached to any device. This requires that in scalable mode, when the domain is allocated, the format (FL or SL) of the page table must be determined. In order to achieve this, the platform should support consistent SL or FL capabilities on all IOMMU's. This adds a check for this and aborts IOMMU probing if it doesn't meet this requirement. Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Link: https://lore.kernel.org/r/20210926114535.923263-1-baolu.lu@linux.intel.com Link: https://lore.kernel.org/r/20211014053839.727419-5-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/intel/cap_audit.c13
-rw-r--r--drivers/iommu/intel/cap_audit.h1
2 files changed, 14 insertions, 0 deletions
diff --git a/drivers/iommu/intel/cap_audit.c b/drivers/iommu/intel/cap_audit.c
index b12e421a2f1a..b39d223926a4 100644
--- a/drivers/iommu/intel/cap_audit.c
+++ b/drivers/iommu/intel/cap_audit.c
@@ -163,6 +163,14 @@ static int cap_audit_static(struct intel_iommu *iommu, enum cap_audit_type type)
check_irq_capabilities(iommu, i);
}
+ /*
+ * If the system is sane to support scalable mode, either SL or FL
+ * should be sane.
+ */
+ if (intel_cap_smts_sanity() &&
+ !intel_cap_flts_sanity() && !intel_cap_slts_sanity())
+ return -EOPNOTSUPP;
+
out:
rcu_read_unlock();
return 0;
@@ -203,3 +211,8 @@ bool intel_cap_flts_sanity(void)
{
return ecap_flts(intel_iommu_ecap_sanity);
}
+
+bool intel_cap_slts_sanity(void)
+{
+ return ecap_slts(intel_iommu_ecap_sanity);
+}
diff --git a/drivers/iommu/intel/cap_audit.h b/drivers/iommu/intel/cap_audit.h
index 74cfccae0e81..d07b75938961 100644
--- a/drivers/iommu/intel/cap_audit.h
+++ b/drivers/iommu/intel/cap_audit.h
@@ -111,6 +111,7 @@ bool intel_cap_smts_sanity(void);
bool intel_cap_pasid_sanity(void);
bool intel_cap_nest_sanity(void);
bool intel_cap_flts_sanity(void);
+bool intel_cap_slts_sanity(void);
static inline bool scalable_mode_support(void)
{