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| author |   Lu Baolu <baolu.lu@linux.intel.com> | 2022-05-10 10:34:04 +0800 |
|---|---|---|
| committer |   Joerg Roedel <jroedel@suse.de> | 2022-05-13 15:14:56 +0200 |
| commit | 9d6ab26a75f47332da9949a0112727e10f2d6e51 (patch) | |
| tree | 7779278eb13bcefca6ac8d94601c970aaf68b3a6 | |
| parent | iommu/vt-d: Size Page Request Queue to avoid overflow condition (diff) | |
| download | wireguard-linux-9d6ab26a75f47332da9949a0112727e10f2d6e51.tar.xz wireguard-linux-9d6ab26a75f47332da9949a0112727e10f2d6e51.zip | |
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>
| -rw-r--r-- | drivers/iommu/intel/iommu.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index f200af2233d0..23985cb5c8ee 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -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)) |