This patch reports nesting info when iommu_domain_get_attr() is called with DOMAIN_ATTR_NESTING and one domain with nesting set.
Cc: Kevin Tian <[email protected]> CC: Jacob Pan <[email protected]> Cc: Alex Williamson <[email protected]> Cc: Eric Auger <[email protected]> Cc: Jean-Philippe Brucker <[email protected]> Cc: Joerg Roedel <[email protected]> Cc: Lu Baolu <[email protected]> Signed-off-by: Liu Yi L <[email protected]> Signed-off-by: Jacob Pan <[email protected]> --- v6 -> v7: *) split the patch in v6 into two patches: [PATCH v7 15/16] iommu/vt-d: Only support nesting when nesting caps are consistent across iommu units [PATCH v7 16/16] iommu/vt-d: Support reporting nesting capability info v2 -> v3: *) remove cap/ecap_mask in iommu_nesting_info. --- drivers/iommu/intel/iommu.c | 74 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 38c6c9b..e46214e 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -6089,6 +6089,79 @@ intel_iommu_domain_set_attr(struct iommu_domain *domain, return ret; } +static int intel_iommu_get_nesting_info(struct iommu_domain *domain, + struct iommu_nesting_info *info) +{ + struct dmar_domain *dmar_domain = to_dmar_domain(domain); + u64 cap = VTD_CAP_MASK, ecap = VTD_ECAP_MASK; + struct device_domain_info *domain_info; + struct iommu_nesting_info_vtd vtd; + unsigned int size; + + if (!info) + return -EINVAL; + + if (domain->type != IOMMU_DOMAIN_UNMANAGED || + !(dmar_domain->flags & DOMAIN_FLAG_NESTING_MODE)) + return -ENODEV; + + size = sizeof(struct iommu_nesting_info); + /* + * if provided buffer size is smaller than expected, should + * return 0 and also the expected buffer size to caller. + */ + if (info->argsz < size) { + info->argsz = size; + return 0; + } + + /* + * arbitrary select the first domain_info as all nesting + * related capabilities should be consistent across iommu + * units. + */ + domain_info = list_first_entry(&dmar_domain->devices, + struct device_domain_info, link); + cap &= domain_info->iommu->cap; + ecap &= domain_info->iommu->ecap; + + info->addr_width = dmar_domain->gaw; + info->format = IOMMU_PASID_FORMAT_INTEL_VTD; + info->features = IOMMU_NESTING_FEAT_SYSWIDE_PASID | + IOMMU_NESTING_FEAT_BIND_PGTBL | + IOMMU_NESTING_FEAT_CACHE_INVLD; + info->pasid_bits = ilog2(intel_pasid_max_id); + memset(&info->padding, 0x0, 12); + + vtd.flags = 0; + vtd.cap_reg = cap; + vtd.ecap_reg = ecap; + + memcpy(&info->vendor.vtd, &vtd, sizeof(vtd)); + return 0; +} + +static int intel_iommu_domain_get_attr(struct iommu_domain *domain, + enum iommu_attr attr, void *data) +{ + switch (attr) { + case DOMAIN_ATTR_NESTING: + { + struct iommu_nesting_info *info = + (struct iommu_nesting_info *)data; + unsigned long flags; + int ret; + + spin_lock_irqsave(&device_domain_lock, flags); + ret = intel_iommu_get_nesting_info(domain, info); + spin_unlock_irqrestore(&device_domain_lock, flags); + return ret; + } + default: + return -ENOENT; + } +} + /* * Check that the device does not live on an external facing PCI port that is * marked as untrusted. Such devices should not be able to apply quirks and @@ -6111,6 +6184,7 @@ const struct iommu_ops intel_iommu_ops = { .domain_alloc = intel_iommu_domain_alloc, .domain_free = intel_iommu_domain_free, .domain_set_attr = intel_iommu_domain_set_attr, + .domain_get_attr = intel_iommu_domain_get_attr, .attach_dev = intel_iommu_attach_device, .detach_dev = intel_iommu_detach_device, .aux_attach_dev = intel_iommu_aux_attach_device, -- 2.7.4 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
