From: Lu Baolu <baolu.lu@linux.intel.com>
To: Joerg Roedel <joro@8bytes.org>,
David Woodhouse <dwmw2@infradead.org>,
Alex Williamson <alex.williamson@redhat.com>
Cc: kevin.tian@intel.com, Yi Sun <yi.y.sun@linux.intel.com>,
ashok.raj@intel.com, kvm@vger.kernel.org,
sanjay.k.kumar@intel.com, iommu@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, yi.y.sun@intel.com
Subject: [PATCH v2 8/8] iommu/vt-d: Add set domain DOMAIN_ATTR_NESTING attr
Date: Thu, 28 Nov 2019 10:25:50 +0800 [thread overview]
Message-ID: <20191128022550.9832-9-baolu.lu@linux.intel.com> (raw)
In-Reply-To: <20191128022550.9832-1-baolu.lu@linux.intel.com>
This adds the Intel VT-d specific callback of setting
DOMAIN_ATTR_NESTING domain attribution. It is necessary
to let the VT-d driver know that the domain represents
a virutual machine which requires the IOMMU hardware to
support nested translation mode. Return success if the
IOMMU hardware suports nested mode, otherwise failure.
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Liu Yi L <yi.l.liu@intel.com>
Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
drivers/iommu/intel-iommu.c | 56 +++++++++++++++++++++++++++++++++++++
1 file changed, 56 insertions(+)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 68b2f98ecd65..ee717dcb9644 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -308,6 +308,12 @@ static int hw_pass_through = 1;
*/
#define DOMAIN_FLAG_LOSE_CHILDREN BIT(1)
+/*
+ * Domain represents a virtual machine which demands iommu nested
+ * translation mode support.
+ */
+#define DOMAIN_FLAG_NESTING_MODE BIT(2)
+
#define for_each_domain_iommu(idx, domain) \
for (idx = 0; idx < g_num_of_iommus; idx++) \
if (domain->iommu_refcnt[idx])
@@ -5929,6 +5935,24 @@ static inline bool iommu_pasid_support(void)
return ret;
}
+static inline bool nested_mode_support(void)
+{
+ struct dmar_drhd_unit *drhd;
+ struct intel_iommu *iommu;
+ bool ret = true;
+
+ rcu_read_lock();
+ for_each_active_iommu(iommu, drhd) {
+ if (!sm_supported(iommu) || !ecap_nest(iommu->ecap)) {
+ ret = false;
+ break;
+ }
+ }
+ rcu_read_unlock();
+
+ return ret;
+}
+
static bool intel_iommu_capable(enum iommu_cap cap)
{
if (cap == IOMMU_CAP_CACHE_COHERENCY)
@@ -6305,10 +6329,42 @@ static bool intel_iommu_is_attach_deferred(struct iommu_domain *domain,
return dev->archdata.iommu == DEFER_DEVICE_DOMAIN_INFO;
}
+static int
+intel_iommu_domain_set_attr(struct iommu_domain *domain,
+ enum iommu_attr attr, void *data)
+{
+ struct dmar_domain *dmar_domain = to_dmar_domain(domain);
+ unsigned long flags;
+ int ret = 0;
+
+ if (domain->type != IOMMU_DOMAIN_UNMANAGED)
+ return -EINVAL;
+
+ switch (attr) {
+ case DOMAIN_ATTR_NESTING:
+ spin_lock_irqsave(&device_domain_lock, flags);
+ if (nested_mode_support() &&
+ list_empty(&dmar_domain->devices)) {
+ dmar_domain->flags |= DOMAIN_FLAG_NESTING_MODE;
+ dmar_domain->ops = &second_lvl_pgtable_ops;
+ } else {
+ ret = -ENODEV;
+ }
+ spin_unlock_irqrestore(&device_domain_lock, flags);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
const struct iommu_ops intel_iommu_ops = {
.capable = intel_iommu_capable,
.domain_alloc = intel_iommu_domain_alloc,
.domain_free = intel_iommu_domain_free,
+ .domain_set_attr = intel_iommu_domain_set_attr,
.attach_dev = intel_iommu_attach_device,
.detach_dev = intel_iommu_detach_device,
.aux_attach_dev = intel_iommu_aux_attach_device,
--
2.17.1
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2019-11-28 2:30 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-28 2:25 [PATCH v2 0/8] Use 1st-level for DMA remapping Lu Baolu
2019-11-28 2:25 ` [PATCH v2 1/8] iommu/vt-d: Add per domain page table ops Lu Baolu
2019-11-28 2:25 ` [PATCH v2 2/8] iommu/vt-d: Move domain_flush_cache helper into header Lu Baolu
2019-11-28 2:25 ` [PATCH v2 3/8] iommu/vt-d: Implement second level page table ops Lu Baolu
2019-11-28 2:25 ` [PATCH v2 4/8] iommu/vt-d: Apply per domain " Lu Baolu
2019-11-28 2:25 ` [PATCH v2 5/8] iommu/vt-d: Add first level page table interfaces Lu Baolu
2019-12-02 23:27 ` Jacob Pan
2019-12-03 2:36 ` Lu Baolu
2019-12-11 1:56 ` Lu Baolu
2019-11-28 2:25 ` [PATCH v2 6/8] iommu/vt-d: Implement first level page table ops Lu Baolu
2019-11-28 2:25 ` [PATCH v2 7/8] iommu/vt-d: Identify domains using first level page table Lu Baolu
2019-11-28 2:25 ` Lu Baolu [this message]
2019-12-02 20:19 ` [PATCH v2 0/8] Use 1st-level for DMA remapping Jacob Pan
2019-12-03 2:19 ` Lu Baolu
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