[PATCH 05/17] iommu/vt-d: Add nested domain support

From: Yi Liu
Date: Wed Feb 08 2023 - 23:34:31 EST

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From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>

This adds nested domain support in the Intel IOMMU driver. It allows to
allocate and free a nested domain, set the nested domain to a device,
and synchronize the caches when the userspace managed page tables are
updated.

Signed-off-by: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx>
---
drivers/iommu/intel/Makefile | 2 +-
drivers/iommu/intel/iommu.c | 38 ++++++----
drivers/iommu/intel/iommu.h | 15 ++++
drivers/iommu/intel/nested.c | 143 +++++++++++++++++++++++++++++++++++
include/uapi/linux/iommufd.h | 54 +++++++++++++
5 files changed, 236 insertions(+), 16 deletions(-)
create mode 100644 drivers/iommu/intel/nested.c

diff --git a/drivers/iommu/intel/Makefile b/drivers/iommu/intel/Makefile
index fa0dae16441c..8b324db03692 100644
--- a/drivers/iommu/intel/Makefile
+++ b/drivers/iommu/intel/Makefile
@@ -1,6 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_DMAR_TABLE) += dmar.o
-obj-$(CONFIG_INTEL_IOMMU) += iommu.o pasid.o
+obj-$(CONFIG_INTEL_IOMMU) += iommu.o pasid.o nested.o
obj-$(CONFIG_DMAR_TABLE) += trace.o cap_audit.o
obj-$(CONFIG_DMAR_PERF) += perf.o
obj-$(CONFIG_INTEL_IOMMU_DEBUGFS) += debugfs.o
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 929f600cc350..ea42d169afa2 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -277,7 +277,6 @@ static LIST_HEAD(dmar_satc_units);
#define for_each_rmrr_units(rmrr) \
list_for_each_entry(rmrr, &dmar_rmrr_units, list)

-static void device_block_translation(struct device *dev);
static void intel_iommu_domain_free(struct iommu_domain *domain);

int dmar_disabled = !IS_ENABLED(CONFIG_INTEL_IOMMU_DEFAULT_ON);
@@ -555,7 +554,7 @@ static unsigned long domain_super_pgsize_bitmap(struct dmar_domain *domain)
}

/* Some capabilities may be different across iommus */
-static void domain_update_iommu_cap(struct dmar_domain *domain)
+void domain_update_iommu_cap(struct dmar_domain *domain)
{
domain_update_iommu_coherency(domain);
domain->iommu_superpage = domain_update_iommu_superpage(domain, NULL);
@@ -1497,10 +1496,10 @@ static void iommu_flush_dev_iotlb(struct dmar_domain *domain,
spin_unlock_irqrestore(&domain->lock, flags);
}

-static void iommu_flush_iotlb_psi(struct intel_iommu *iommu,
- struct dmar_domain *domain,
- unsigned long pfn, unsigned int pages,
- int ih, int map)
+void iommu_flush_iotlb_psi(struct intel_iommu *iommu,
+ struct dmar_domain *domain,
+ unsigned long pfn, unsigned int pages,
+ int ih, int map)
{
unsigned int aligned_pages = __roundup_pow_of_two(pages);
unsigned int mask = ilog2(aligned_pages);
@@ -1572,7 +1571,7 @@ static inline void __mapping_notify_one(struct intel_iommu *iommu,
iommu_flush_write_buffer(iommu);
}

-static void intel_flush_iotlb_all(struct iommu_domain *domain)
+void intel_flush_iotlb_all(struct iommu_domain *domain)
{
struct dmar_domain *dmar_domain = to_dmar_domain(domain);
struct iommu_domain_info *info;
@@ -1764,8 +1763,7 @@ static struct dmar_domain *alloc_domain(unsigned int type)
return domain;
}

-static int domain_attach_iommu(struct dmar_domain *domain,
- struct intel_iommu *iommu)
+int domain_attach_iommu(struct dmar_domain *domain, struct intel_iommu *iommu)
{
struct iommu_domain_info *info, *curr;
unsigned long ndomains;
@@ -1814,8 +1812,7 @@ static int domain_attach_iommu(struct dmar_domain *domain,
return ret;
}

-static void domain_detach_iommu(struct dmar_domain *domain,
- struct intel_iommu *iommu)
+void domain_detach_iommu(struct dmar_domain *domain, struct intel_iommu *iommu)
{
struct iommu_domain_info *info;

@@ -4096,7 +4093,7 @@ static void dmar_remove_one_dev_info(struct device *dev)
* all DMA requests without PASID from the device are blocked. If the page
* table has been set, clean up the data structures.
*/
-static void device_block_translation(struct device *dev)
+void device_block_translation(struct device *dev)
{
struct device_domain_info *info = dev_iommu_priv_get(dev);
struct intel_iommu *iommu = info->iommu;
@@ -4197,14 +4194,24 @@ static struct iommu_domain *intel_iommu_domain_alloc(unsigned type)
return NULL;
}

+static struct iommu_domain *
+intel_iommu_domain_alloc_user(struct device *dev, struct iommu_domain *parent,
+ const void *user_data)
+{
+ if (parent)
+ return intel_nested_domain_alloc(parent, user_data);
+ else
+ return iommu_domain_alloc(dev->bus);
+}
+
static void intel_iommu_domain_free(struct iommu_domain *domain)
{
if (domain != &si_domain->domain && domain != &blocking_domain)
domain_exit(to_dmar_domain(domain));
}

-static int prepare_domain_attach_device(struct iommu_domain *domain,
- struct device *dev)
+int prepare_domain_attach_device(struct iommu_domain *domain,
+ struct device *dev)
{
struct dmar_domain *dmar_domain = to_dmar_domain(domain);
struct intel_iommu *iommu;
@@ -4436,7 +4443,7 @@ static void domain_set_force_snooping(struct dmar_domain *domain)
PASID_RID2PASID);
}

-static bool intel_iommu_enforce_cache_coherency(struct iommu_domain *domain)
+bool intel_iommu_enforce_cache_coherency(struct iommu_domain *domain)
{
struct dmar_domain *dmar_domain = to_dmar_domain(domain);
unsigned long flags;
@@ -4781,6 +4788,7 @@ const struct iommu_ops intel_iommu_ops = {
.capable = intel_iommu_capable,
.hw_info = intel_iommu_hw_info,
.domain_alloc = intel_iommu_domain_alloc,
+ .domain_alloc_user = intel_iommu_domain_alloc_user,
.probe_device = intel_iommu_probe_device,
.probe_finalize = intel_iommu_probe_finalize,
.release_device = intel_iommu_release_device,
diff --git a/drivers/iommu/intel/iommu.h b/drivers/iommu/intel/iommu.h
index 4fe74f217696..25d1c99fce40 100644
--- a/drivers/iommu/intel/iommu.h
+++ b/drivers/iommu/intel/iommu.h
@@ -753,6 +753,19 @@ void qi_flush_pasid_cache(struct intel_iommu *iommu, u16 did, u64 granu,

int qi_submit_sync(struct intel_iommu *iommu, struct qi_desc *desc,
unsigned int count, unsigned long options);
+int domain_attach_iommu(struct dmar_domain *domain, struct intel_iommu *iommu);
+void domain_detach_iommu(struct dmar_domain *domain, struct intel_iommu *iommu);
+void device_block_translation(struct device *dev);
+int prepare_domain_attach_device(struct iommu_domain *domain,
+ struct device *dev);
+bool intel_iommu_enforce_cache_coherency(struct iommu_domain *domain);
+void iommu_flush_iotlb_psi(struct intel_iommu *iommu,
+ struct dmar_domain *domain,
+ unsigned long pfn, unsigned int pages,
+ int ih, int map);
+void intel_flush_iotlb_all(struct iommu_domain *domain);
+void domain_update_iommu_cap(struct dmar_domain *domain);
+
/*
* Options used in qi_submit_sync:
* QI_OPT_WAIT_DRAIN - Wait for PRQ drain completion, spec 6.5.2.8.
@@ -765,6 +778,8 @@ void *alloc_pgtable_page(int node);
void free_pgtable_page(void *vaddr);
void iommu_flush_write_buffer(struct intel_iommu *iommu);
struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devfn);
+struct iommu_domain *intel_nested_domain_alloc(struct iommu_domain *s2_domain,
+ const void *data);

#ifdef CONFIG_INTEL_IOMMU_SVM
extern void intel_svm_check(struct intel_iommu *iommu);
diff --git a/drivers/iommu/intel/nested.c b/drivers/iommu/intel/nested.c
new file mode 100644
index 000000000000..7624a3dd4603
--- /dev/null
+++ b/drivers/iommu/intel/nested.c
@@ -0,0 +1,143 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * nested.c - nested mode translation support
+ *
+ * Copyright (C) 2023 Intel Corporation
+ *
+ * Author: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
+ * Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
+ */
+
+#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);
+
+ /* Is s2_domain 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,
+ PASID_RID2PASID, 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);
+ domain_update_iommu_cap(dmar_domain);
+
+ return 0;
+}
+
+static void intel_nested_domain_free(struct iommu_domain *domain)
+{
+ kfree(to_dmar_domain(domain));
+}
+
+static void intel_nested_invalidate(struct device *dev,
+ struct dmar_domain *domain,
+ void *user_data)
+{
+ struct iommu_hwpt_invalidate_intel_vtd *inv_info = user_data;
+ struct device_domain_info *info = dev_iommu_priv_get(dev);
+ struct intel_iommu *iommu = info->iommu;
+
+ if (WARN_ON(!user_data))
+ return;
+
+ switch (inv_info->granularity) {
+ case IOMMU_VTD_QI_GRAN_ADDR:
+ if (inv_info->granule_size != VTD_PAGE_SIZE ||
+ !IS_ALIGNED(inv_info->addr, VTD_PAGE_SIZE)) {
+ dev_err_ratelimited(dev, "Invalid invalidation address 0x%llx\n",
+ inv_info->addr);
+ return;
+ }
+
+ iommu_flush_iotlb_psi(iommu, domain,
+ inv_info->addr >> VTD_PAGE_SHIFT,
+ inv_info->nb_granules, 1, 0);
+ break;
+ case IOMMU_VTD_QI_GRAN_DOMAIN:
+ intel_flush_iotlb_all(&domain->domain);
+ break;
+ default:
+ dev_err_ratelimited(dev, "Unsupported IOMMU invalidation type %d\n",
+ inv_info->granularity);
+ break;
+ }
+}
+
+static void intel_nested_iotlb_sync_user(struct iommu_domain *domain,
+ void *user_data)
+{
+ struct dmar_domain *dmar_domain = to_dmar_domain(domain);
+ struct device_domain_info *info;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dmar_domain->lock, flags);
+ list_for_each_entry(info, &dmar_domain->devices, link)
+ intel_nested_invalidate(info->dev, dmar_domain,
+ user_data);
+ spin_unlock_irqrestore(&dmar_domain->lock, flags);
+}
+
+static const struct iommu_domain_ops intel_nested_domain_ops = {
+ .attach_dev = intel_nested_attach_dev,
+ .iotlb_sync_user = intel_nested_iotlb_sync_user,
+ .free = intel_nested_domain_free,
+ .enforce_cache_coherency = intel_iommu_enforce_cache_coherency,
+};
+
+struct iommu_domain *intel_nested_domain_alloc(struct iommu_domain *s2_domain,
+ const void *user_data)
+{
+ const struct iommu_hwpt_intel_vtd *vtd = user_data;
+ struct dmar_domain *domain;
+
+ domain = kzalloc(sizeof(*domain), GFP_KERNEL_ACCOUNT);
+ if (!domain)
+ return NULL;
+
+ domain->use_first_level = true;
+ domain->s2_domain = to_dmar_domain(s2_domain);
+ domain->s1_pgtbl = vtd->pgtbl_addr;
+ domain->s1_cfg = *vtd;
+ domain->domain.ops = &intel_nested_domain_ops;
+ domain->domain.type = IOMMU_DOMAIN_NESTED;
+ INIT_LIST_HEAD(&domain->devices);
+ spin_lock_init(&domain->lock);
+ xa_init(&domain->iommu_array);
+
+ return &domain->domain;
+}
diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h
index 0867900494c9..bbffb63d2513 100644
--- a/include/uapi/linux/iommufd.h
+++ b/include/uapi/linux/iommufd.h
@@ -460,4 +460,58 @@ struct iommu_hwpt_intel_vtd {
__u32 addr_width;
__u32 __reserved;
};
+
+/**
+ * enum iommu_vtd_qi_granularity - Intel VT-d specific granularity of
+ * queued invalidation
+ * @IOMMU_VTD_QI_GRAN_DOMAIN: domain-selective invalidation
+ * @IOMMU_VTD_QI_GRAN_ADDR: page-selective invalidation
+ */
+enum iommu_vtd_qi_granularity {
+ IOMMU_VTD_QI_GRAN_DOMAIN,
+ IOMMU_VTD_QI_GRAN_ADDR,
+};
+
+/**
+ * enum iommu_hwpt_intel_vtd_invalidate_flags - Flags for Intel VT-d
+ * stage-1 page table cache
+ * invalidation
+ * @IOMMU_VTD_QI_FLAGS_LEAF: The LEAF flag indicates whether only the
+ * leaf PTE caching needs to be invalidated
+ * and other paging structure caches can be
+ * preserved.
+ */
+enum iommu_hwpt_intel_vtd_invalidate_flags {
+ IOMMU_VTD_QI_FLAGS_LEAF = 1 << 0,
+};
+
+/**
+ * struct iommu_hwpt_invalidate_intel_vtd - Intel VT-d cache invalidation info
+ * @granularity: One of enum iommu_vtd_qi_granularity.
+ * @flags: Combination of enum iommu_hwpt_intel_vtd_invalidate_flags
+ * @__reserved: Must be 0
+ * @addr: The start address of the addresses to be invalidated.
+ * @granule_size: Page/block size of the mapping in bytes. It is used to
+ * compute the invalidation range togehter with @nb_granules.
+ * @nb_granules: Number of contiguous granules to be invalidated.
+ *
+ * The Intel VT-d specific invalidation data for user-managed stage-1 cache
+ * invalidation under nested translation. Userspace uses this structure to
+ * tell host about the impacted caches after modifying the stage-1 page table.
+ *
+ * @addr, @granule_size and @nb_granules are meaningful when
+ * @granularity==IOMMU_VTD_QI_GRAN_ADDR. Intel VT-d currently only supports
+ * 4kB page size, so @granule_size should be 4KB. @addr should be aligned
+ * with @granule_size * @nb_granules, otherwise invalidation won't take
+ * effect.
+ */
+struct iommu_hwpt_invalidate_intel_vtd {
+ __u8 granularity;
+ __u8 padding[7];
+ __u32 flags;
+ __u32 __reserved;
+ __u64 addr;
+ __u64 granule_size;
+ __u64 nb_granules;
+};
#endif
--
2.34.1

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