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iommu/vt-d: Set SRE bit only when hardware has SRS cap

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SRS cap is the hardware cap telling if the hardware IOMMU can support
requests seeking supervisor privilege or not. SRE bit in scalable-mode
PASID table entry is treated as Reserved(0) for implementation not
supporting SRS cap.

Checking SRS cap before setting SRE bit can avoid the non-recoverable
fault of "Non-zero reserved field set in PASID Table Entry" caused by
setting SRE bit while there is no SRS cap support. The fault messages
look like below:

 DMAR: DRHD: handling fault status reg 2
 DMAR: [DMA Read NO_PASID] Request device [00:0d.0] fault addr 0x1154e1000
       [fault reason 0x5a]
       SM: Non-zero reserved field set in PASID Table Entry

Fixes: 6f7db75e1c ("iommu/vt-d: Add second level page table interface")
Cc: stable@vger.kernel.org
Signed-off-by: Tina Zhang <tina.zhang@intel.com>
Link: https://lore.kernel.org/r/20221115070346.1112273-1-tina.zhang@intel.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20221116051544.26540-3-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Tina Zhang 2022-11-16 13:15:44 +08:00 committed by Joerg Roedel
parent 242b0aaeab
commit 7fc961cf7f
1 changed files with 3 additions and 2 deletions
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5
drivers/iommu/intel/pasid.c
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@ -642,7 +642,7 @@ int intel_pasid_setup_second_level(struct intel_iommu *iommu,
* Since it is a second level only translation setup, we should
* set SRE bit as well (addresses are expected to be GPAs).
*/
if (pasid != PASID_RID2PASID)
if (pasid != PASID_RID2PASID && ecap_srs(iommu->ecap))
pasid_set_sre(pte);
pasid_set_present(pte);
spin_unlock(&iommu->lock);
@ -685,7 +685,8 @@ int intel_pasid_setup_pass_through(struct intel_iommu *iommu,
* We should set SRE bit as well since the addresses are expected
* to be GPAs.
*/
pasid_set_sre(pte);
if (ecap_srs(iommu->ecap))
pasid_set_sre(pte);
pasid_set_present(pte);
spin_unlock(&iommu->lock);