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iommu/vt-d: Set the nested domain to a device

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This adds the helper for setting the nested domain to a device hence
enable nested domain usage on Intel VT-d.

Link: https://lore.kernel.org/r/20231026044216.64964-7-yi.l.liu@intel.com
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Yi Liu 2023-10-25 21:42:14 -07:00 committed by Jason Gunthorpe
parent d86724d4dc
commit 9838f2bb6b
1 changed files with 54 additions and 0 deletions
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54
drivers/iommu/intel/nested.c
View file

@ -12,8 +12,61 @@
#define pr_fmt(fmt) "DMAR: " fmt
#include <linux/iommu.h>
#include <linux/pci.h>
#include <linux/pci-ats.h>
#include "iommu.h"
#include "pasid.h"
static int intel_nested_attach_dev(struct iommu_domain *domain,
struct device *dev)
{
struct device_domain_info *info = dev_iommu_priv_get(dev);
struct dmar_domain *dmar_domain = to_dmar_domain(domain);
struct intel_iommu *iommu = info->iommu;
unsigned long flags;
int ret = 0;
if (info->domain)
device_block_translation(dev);
if (iommu->agaw < dmar_domain->s2_domain->agaw) {
dev_err_ratelimited(dev, "Adjusted guest address width not compatible\n");
return -ENODEV;
}
/*
* Stage-1 domain cannot work alone, it is nested on a s2_domain.
* The s2_domain will be used in nested translation, hence needs
* to ensure the s2_domain is compatible with this IOMMU.
*/
ret = prepare_domain_attach_device(&dmar_domain->s2_domain->domain, dev);
if (ret) {
dev_err_ratelimited(dev, "s2 domain is not compatible\n");
return ret;
}
ret = domain_attach_iommu(dmar_domain, iommu);
if (ret) {
dev_err_ratelimited(dev, "Failed to attach domain to iommu\n");
return ret;
}
ret = intel_pasid_setup_nested(iommu, dev,
IOMMU_NO_PASID, dmar_domain);
if (ret) {
domain_detach_iommu(dmar_domain, iommu);
dev_err_ratelimited(dev, "Failed to setup pasid entry\n");
return ret;
}
info->domain = dmar_domain;
spin_lock_irqsave(&dmar_domain->lock, flags);
list_add(&info->link, &dmar_domain->devices);
spin_unlock_irqrestore(&dmar_domain->lock, flags);
return 0;
}
static void intel_nested_domain_free(struct iommu_domain *domain)
{
@ -21,6 +74,7 @@ static void intel_nested_domain_free(struct iommu_domain *domain)
}
static const struct iommu_domain_ops intel_nested_domain_ops = {
.attach_dev = intel_nested_attach_dev,
.free = intel_nested_domain_free,
};