> From: Lu Baolu <baolu...@linux.intel.com> > Sent: Thursday, May 5, 2022 9:07 AM > > 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...@linux.intel.com> > Reviewed-by: Jason Gunthorpe <j...@nvidia.com>
Reviewed-by: Kevin Tian <kevin.t...@intel.com> > --- > drivers/iommu/intel/iommu.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c > index cf43e8f9091b..d68f5bbf3e93 100644 > --- a/drivers/iommu/intel/iommu.c > +++ b/drivers/iommu/intel/iommu.c > @@ -4354,6 +4354,9 @@ 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)) > -- > 2.25.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
