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iommu/vt-d: Block force-snoop domain attaching if no SC support 

In the attach_dev callback of the default domain ops, if the domain has
been set force_snooping, but the iommu hardware of the device does not
support SC(Snoop Control) capability, the callback should block it and
return a corresponding error code.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20220508123525.1973626-1-baolu.lu@linux.intel.com
Link: https://lore.kernel.org/r/20220510023407.2759143-6-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2022-05-10 10:34:04 +08:00 committed by Joerg Roedel
parent ea661ad6e1
commit 9d6ab26a75
1 changed files with 3 additions and 0 deletions
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3
drivers/iommu/intel/iommu.c
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@ -4333,6 +4333,9 @@ static int prepare_domain_attach_device(struct iommu_domain *domain,
if (!iommu)
return -ENODEV;
if (dmar_domain->force_snooping && !ecap_sc_support(iommu->ecap))
return -EOPNOTSUPP;
/* check if this iommu agaw is sufficient for max mapped address */
addr_width = agaw_to_width(iommu->agaw);
if (addr_width > cap_mgaw(iommu->cap))