On 2023/10/25 07:03, Jason Gunthorpe wrote:
On Tue, Oct 24, 2023 at 08:14:11AM -0700, Yi Liu wrote:
From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
This adds the support for IOMMU_HWPT_DATA_VTD_S1 type. And 'nested_parent'
is added to mark the nested parent domain to sanitize the input parent domain.
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx>
---
drivers/iommu/intel/iommu.c | 67 +++++++++++++++++++++++++------------
drivers/iommu/intel/iommu.h | 1 +
2 files changed, 46 insertions(+), 22 deletions(-)
I think it should be written like this:
@@ -4077,38 +4082,39 @@ intel_iommu_domain_alloc_user(struct device *dev, u32 flags,
struct iommu_domain *parent,
const struct iommu_user_data *user_data)
{
+ struct device_domain_info *info = dev_iommu_priv_get(dev);
+ bool dirty_tracking = flags & IOMMU_HWPT_ALLOC_DIRTY_TRACKING;
+ bool nested_parent = flags & IOMMU_HWPT_ALLOC_NEST_PARENT;
+ struct intel_iommu *iommu = info->iommu;
struct iommu_domain *domain;
- struct intel_iommu *iommu;
- bool dirty_tracking;
+
+ /* Must be NESTING domain */
+ if (parent) {
+ if (!nested_supported(iommu) || flags)
+ return ERR_PTR(-EOPNOTSUPP);
+ return intel_nested_domain_alloc(parent, user_data);
+ }
if (flags &
(~(IOMMU_HWPT_ALLOC_NEST_PARENT | IOMMU_HWPT_ALLOC_DIRTY_TRACKING)))
return ERR_PTR(-EOPNOTSUPP);
-
- if (parent || user_data)
+ if (nested_parent && !nested_supported(iommu))
return ERR_PTR(-EOPNOTSUPP);
-
- iommu = device_to_iommu(dev, NULL, NULL);
- if (!iommu)
- return ERR_PTR(-ENODEV);
-
- if ((flags & IOMMU_HWPT_ALLOC_NEST_PARENT) && !nested_supported(iommu))
- return ERR_PTR(-EOPNOTSUPP);
-
- dirty_tracking = (flags & IOMMU_HWPT_ALLOC_DIRTY_TRACKING);
- if (dirty_tracking && !ssads_supported(iommu))
+ if (user_data || (dirty_tracking && !ssads_supported(iommu)))
return ERR_PTR(-EOPNOTSUPP);
/*
- * domain_alloc_user op needs to fully initialize a domain
- * before return, so uses iommu_domain_alloc() here for
- * simple.
+ * domain_alloc_user op needs to fully initialize a domain before
+ * return, so uses iommu_domain_alloc() here for simple.
*/
domain = iommu_domain_alloc(dev->bus);
if (!domain)
- domain = ERR_PTR(-ENOMEM);
+ return ERR_PTR(-ENOMEM);
- if (!IS_ERR(domain) && dirty_tracking) {
+ if (nested_parent)
+ to_dmar_domain(domain)->nested_parent = true;
+
+ if (dirty_tracking) {
if (to_dmar_domain(domain)->use_first_level) {
iommu_domain_free(domain);
return ERR_PTR(-EOPNOTSUPP);
@@ -4849,6 +4855,7 @@ static void *intel_iommu_hw_info(struct device *dev, u32 *length, u32 *type)
if (!vtd)
return ERR_PTR(-ENOMEM);
+ vtd->flags = IOMMU_HW_INFO_VTD_ERRATA_772415_SPR17;
this flag is introduced in [8/8]. still make sense to keep it there?
vtd->cap_reg = iommu->cap;
vtd->ecap_reg = iommu->ecap;
*length = sizeof(*vtd);
diff --git a/drivers/iommu/intel/nested.c b/drivers/iommu/intel/nested.c
index d9197dd72748b1..b5a5563ab32c6b 100644
--- a/drivers/iommu/intel/nested.c
+++ b/drivers/iommu/intel/nested.c
@@ -78,13 +78,21 @@ static const struct iommu_domain_ops intel_nested_domain_ops = {
.free = intel_nested_domain_free,
};
-struct iommu_domain *intel_nested_domain_alloc(struct iommu_domain *s2_domain,
+struct iommu_domain *intel_nested_domain_alloc(struct iommu_domain *parent,
const struct iommu_user_data *user_data)
{
+ struct dmar_domain *s2_domain = to_dmar_domain(parent);
struct iommu_hwpt_vtd_s1 vtd;
struct dmar_domain *domain;
int ret;
+ /* Must be nested domain */
+ if (user_data->type != IOMMU_HWPT_DATA_VTD_S1)
+ return ERR_PTR(-EOPNOTSUPP);
+ if (parent->ops != intel_iommu_ops.default_domain_ops ||
+ !s2_domain->nested_parent)
+ return ERR_PTR(-EINVAL);
+
ret = iommu_copy_struct_from_user(&vtd, user_data,
IOMMU_HWPT_DATA_VTD_S1, __reserved);
if (ret)
@@ -95,7 +103,7 @@ struct iommu_domain *intel_nested_domain_alloc(struct iommu_domain *s2_domain,
return ERR_PTR(-ENOMEM);
domain->use_first_level = true;
- domain->s2_domain = to_dmar_domain(s2_domain);
+ domain->s2_domain = s2_domain;
domain->s1_pgtbl = vtd.pgtbl_addr;
domain->s1_cfg = vtd;
domain->domain.ops = &intel_nested_domain_ops;
--
Regards,
Yi Liu
