diff mbox series

[v7,3/3] iommu/vt-d: Add iotlb flush for nested domain

Message ID 20231117131816.24359-4-yi.l.liu@intel.com (mailing list archive)
State New, archived
Headers show
Series Add Intel VT-d nested translation (part 2/2) | expand

Commit Message

Yi Liu Nov. 17, 2023, 1:18 p.m. UTC 
This implements the .cache_invalidate_user() callback to support iotlb
flush for nested domain.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
---
 drivers/iommu/intel/nested.c | 54 ++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

Comments

Tian, Kevin Nov. 20, 2023, 8:32 a.m. UTC | #1 
> From: Liu, Yi L <yi.l.liu@intel.com>
> Sent: Friday, November 17, 2023 9:18 PM
> +
> +		if (inv_info.__reserved || (inv_info.flags &
> ~IOMMU_VTD_INV_FLAGS_LEAF) ||
> +		    !IS_ALIGNED(inv_info.addr, VTD_PAGE_SIZE)) {
> +			ret = -EINVAL;
> +			break;
> +		}

-EOPNOTSUPP for the first two checks.
Jason Gunthorpe Dec. 6, 2023, 6:56 p.m. UTC | #2 
On Fri, Nov 17, 2023 at 05:18:16AM -0800, Yi Liu wrote:
> +static int intel_nested_cache_invalidate_user(struct iommu_domain *domain,
> +					      struct iommu_user_data_array *array,
> +					      u32 *cerror_idx)
> +{
> +	struct dmar_domain *dmar_domain = to_dmar_domain(domain);
> +	struct iommu_hwpt_vtd_s1_invalidate inv_info;
> +	u32 index;
> +	int ret;
> +
> +	/* REVISIT:
> +	 * VT-d has defined ITE, ICE, IQE for invalidation failure per hardware,
> +	 * but no error code yet, so just set the error code to be 0.
> +	 */
> +	*cerror_idx = 0;
> +
> +	for (index = 0; index < array->entry_num; index++) {
> +		ret = iommu_copy_struct_from_user_array(&inv_info, array,
> +							IOMMU_HWPT_DATA_VTD_S1,
> +							index, __reserved);
> +		if (ret) {
> +			pr_err_ratelimited("Failed to fetch invalidation request\n");
> +			break;

No error prints on ioctls!

> +		if (inv_info.addr == 0 && inv_info.npages == -1)
> +			intel_flush_iotlb_all(domain);

-1 is clearer written as U64_MAX - same remark for the comment
documenting it.

Jason
Yi Liu Dec. 12, 2023, 3:58 a.m. UTC | #3 
On 2023/11/20 16:32, Tian, Kevin wrote:
>> From: Liu, Yi L <yi.l.liu@intel.com>
>> Sent: Friday, November 17, 2023 9:18 PM
>> +
>> +		if (inv_info.__reserved || (inv_info.flags &
>> ~IOMMU_VTD_INV_FLAGS_LEAF) ||
>> +		    !IS_ALIGNED(inv_info.addr, VTD_PAGE_SIZE)) {
>> +			ret = -EINVAL;
>> +			break;
>> +		}
> 
> -EOPNOTSUPP for the first two checks.
> 
yes.
Yi Liu Dec. 12, 2023, 3:59 a.m. UTC | #4 
On 2023/12/7 02:56, Jason Gunthorpe wrote:
> On Fri, Nov 17, 2023 at 05:18:16AM -0800, Yi Liu wrote:
>> +static int intel_nested_cache_invalidate_user(struct iommu_domain *domain,
>> +					      struct iommu_user_data_array *array,
>> +					      u32 *cerror_idx)
>> +{
>> +	struct dmar_domain *dmar_domain = to_dmar_domain(domain);
>> +	struct iommu_hwpt_vtd_s1_invalidate inv_info;
>> +	u32 index;
>> +	int ret;
>> +
>> +	/* REVISIT:
>> +	 * VT-d has defined ITE, ICE, IQE for invalidation failure per hardware,
>> +	 * but no error code yet, so just set the error code to be 0.
>> +	 */
>> +	*cerror_idx = 0;
>> +
>> +	for (index = 0; index < array->entry_num; index++) {
>> +		ret = iommu_copy_struct_from_user_array(&inv_info, array,
>> +							IOMMU_HWPT_DATA_VTD_S1,
>> +							index, __reserved);
>> +		if (ret) {
>> +			pr_err_ratelimited("Failed to fetch invalidation request\n");
>> +			break;
> 
> No error prints on ioctls!

ok, will remove it.

> 
>> +		if (inv_info.addr == 0 && inv_info.npages == -1)
>> +			intel_flush_iotlb_all(domain);
> 
> -1 is clearer written as U64_MAX - same remark for the comment
> documenting it.

sure.
diff mbox series

Patch

diff --git a/drivers/iommu/intel/nested.c b/drivers/iommu/intel/nested.c
index b5a5563ab32c..44ad48db7ea0 100644
--- a/drivers/iommu/intel/nested.c
+++ b/drivers/iommu/intel/nested.c
@@ -73,9 +73,63 @@  static void intel_nested_domain_free(struct iommu_domain *domain)
 	kfree(to_dmar_domain(domain));
 }
 
+static void domain_flush_iotlb_psi(struct dmar_domain *domain,
+				   u64 addr, unsigned long npages)
+{
+	struct iommu_domain_info *info;
+	unsigned long i;
+
+	xa_for_each(&domain->iommu_array, i, info)
+		iommu_flush_iotlb_psi(info->iommu, domain,
+				      addr >> VTD_PAGE_SHIFT, npages, 1, 0);
+}
+
+static int intel_nested_cache_invalidate_user(struct iommu_domain *domain,
+					      struct iommu_user_data_array *array,
+					      u32 *cerror_idx)
+{
+	struct dmar_domain *dmar_domain = to_dmar_domain(domain);
+	struct iommu_hwpt_vtd_s1_invalidate inv_info;
+	u32 index;
+	int ret;
+
+	/* REVISIT:
+	 * VT-d has defined ITE, ICE, IQE for invalidation failure per hardware,
+	 * but no error code yet, so just set the error code to be 0.
+	 */
+	*cerror_idx = 0;
+
+	for (index = 0; index < array->entry_num; index++) {
+		ret = iommu_copy_struct_from_user_array(&inv_info, array,
+							IOMMU_HWPT_DATA_VTD_S1,
+							index, __reserved);
+		if (ret) {
+			pr_err_ratelimited("Failed to fetch invalidation request\n");
+			break;
+		}
+
+		if (inv_info.__reserved || (inv_info.flags & ~IOMMU_VTD_INV_FLAGS_LEAF) ||
+		    !IS_ALIGNED(inv_info.addr, VTD_PAGE_SIZE)) {
+			ret = -EINVAL;
+			break;
+		}
+
+		if (inv_info.addr == 0 && inv_info.npages == -1)
+			intel_flush_iotlb_all(domain);
+		else
+			domain_flush_iotlb_psi(dmar_domain,
+					       inv_info.addr, inv_info.npages);
+	}
+
+	array->entry_num = index;
+
+	return ret;
+}
+
 static const struct iommu_domain_ops intel_nested_domain_ops = {
 	.attach_dev		= intel_nested_attach_dev,
 	.free			= intel_nested_domain_free,
+	.cache_invalidate_user	= intel_nested_cache_invalidate_user,
 };
 
 struct iommu_domain *intel_nested_domain_alloc(struct iommu_domain *parent,