From: Eric Auger <eric.auger@redhat.com>
To: eric.auger.pro@gmail.com, eric.auger@redhat.com,
iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu,
joro@8bytes.org, alex.williamson@redhat.com,
jacob.jun.pan@linux.intel.com, yi.l.liu@intel.com,
jean-philippe.brucker@arm.com, will.deacon@arm.com,
robin.murphy@arm.com
Cc: kevin.tian@intel.com, ashok.raj@intel.com, marc.zyngier@arm.com,
christoffer.dall@arm.com, peter.maydell@linaro.org,
vincent.stehle@arm.com
Subject: [PATCH v7 16/23] iommu/smmuv3: Nested mode single MSI doorbell per domain enforcement
Date: Mon, 8 Apr 2019 14:19:04 +0200 [thread overview]
Message-ID: <20190408121911.24103-17-eric.auger@redhat.com> (raw)
In-Reply-To: <20190408121911.24103-1-eric.auger@redhat.com>
In nested mode we enforce the rule that all devices belonging
to the same iommu_domain share the same msi_domain.
Indeed if there were several physical MSI doorbells being used
within a single iommu_domain, it becomes really difficult to
resolve the nested stage mapping translating into the correct
physical doorbell. So let's forbid this situation.
Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
drivers/iommu/arm-smmu-v3.c | 41 +++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 4366921d8318..2b2d90d736d6 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -1781,6 +1781,37 @@ static void arm_smmu_detach_dev(struct device *dev)
arm_smmu_install_ste_for_dev(fwspec);
}
+static bool arm_smmu_share_msi_domain(struct iommu_domain *domain,
+ struct device *dev)
+{
+ struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+ struct irq_domain *irqd = dev_get_msi_domain(dev);
+ struct arm_smmu_master_data *entry;
+ unsigned long flags;
+ bool share = false;
+
+ if (!irqd)
+ return true;
+
+ spin_lock_irqsave(&smmu_domain->devices_lock, flags);
+ list_for_each_entry(entry, &smmu_domain->devices, list) {
+ struct irq_domain *d = dev_get_msi_domain(entry->dev);
+
+ if (!d)
+ continue;
+ if (irqd != d) {
+ dev_info(dev, "Nested mode forbids to attach devices "
+ "using different physical MSI doorbells "
+ "to the same iommu_domain");
+ goto unlock;
+ }
+ }
+ share = true;
+unlock:
+ spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
+ return share;
+}
+
static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
{
int ret = 0;
@@ -1819,6 +1850,16 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
ret = -ENXIO;
goto out_unlock;
}
+ /*
+ * In nested mode we must check all devices belonging to the
+ * domain share the same physical MSI doorbell. Otherwise nested
+ * stage MSI binding is not supported.
+ */
+ if (smmu_domain->stage == ARM_SMMU_DOMAIN_NESTED &&
+ !arm_smmu_share_msi_domain(domain, dev)) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
ste->assigned = true;
master->domain = smmu_domain;
--
2.20.1
next prev parent reply other threads:[~2019-04-08 12:21 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-08 12:18 [PATCH v7 00/23] SMMUv3 Nested Stage Setup Eric Auger
2019-04-08 12:18 ` [PATCH v7 01/23] driver core: add per device iommu param Eric Auger
2019-04-08 12:18 ` [PATCH v7 02/23] iommu: introduce device fault data Eric Auger
2019-04-08 12:18 ` [PATCH v7 03/23] iommu: introduce device fault report API Eric Auger
2019-04-08 12:18 ` [PATCH v7 04/23] iommu: Introduce attach/detach_pasid_table API Eric Auger
2019-05-15 12:09 ` Jean-Philippe Brucker
2019-05-15 13:06 ` Auger Eric
2019-05-15 15:57 ` Jean-Philippe Brucker
2019-04-08 12:18 ` [PATCH v7 05/23] iommu: Introduce cache_invalidate API Eric Auger
2019-05-01 10:38 ` Jean-Philippe Brucker
2019-05-02 6:58 ` Auger Eric
2019-05-02 10:53 ` Jean-Philippe Brucker
2019-05-02 16:46 ` Jacob Pan
2019-05-07 11:45 ` Jean-Philippe Brucker
2019-04-08 12:18 ` [PATCH v7 06/23] iommu: Introduce bind/unbind_guest_msi Eric Auger
2019-05-08 13:59 ` Robin Murphy
2019-05-10 14:35 ` Auger Eric
2019-04-08 12:18 ` [PATCH v7 07/23] vfio: VFIO_IOMMU_ATTACH/DETACH_PASID_TABLE Eric Auger
2019-04-08 12:18 ` [PATCH v7 08/23] vfio: VFIO_IOMMU_CACHE_INVALIDATE Eric Auger
2019-04-08 12:18 ` [PATCH v7 09/23] vfio: VFIO_IOMMU_BIND/UNBIND_MSI Eric Auger
2019-04-08 12:18 ` [PATCH v7 10/23] iommu/arm-smmu-v3: Link domains and devices Eric Auger
2019-04-08 12:18 ` [PATCH v7 11/23] iommu/arm-smmu-v3: Maintain a SID->device structure Eric Auger
2019-05-08 14:05 ` Robin Murphy
2019-05-08 18:31 ` Jean-Philippe Brucker
2019-04-08 12:19 ` [PATCH v7 12/23] iommu/smmuv3: Get prepared for nested stage support Eric Auger
2019-05-08 14:24 ` Robin Murphy
2019-05-10 14:34 ` Auger Eric
2019-05-13 11:43 ` Robin Murphy
2019-05-13 14:40 ` Auger Eric
2019-04-08 12:19 ` [PATCH v7 13/23] iommu/smmuv3: Implement attach/detach_pasid_table Eric Auger
2019-05-08 14:38 ` Robin Murphy
2019-05-10 14:35 ` Auger Eric
2019-05-13 12:04 ` Robin Murphy
2019-04-08 12:19 ` [PATCH v7 14/23] iommu/smmuv3: Implement cache_invalidate Eric Auger
2019-05-08 15:01 ` Robin Murphy
2019-05-13 12:16 ` Auger Eric
2019-05-13 14:01 ` Robin Murphy
2019-05-13 14:04 ` Auger Eric
2019-04-08 12:19 ` [PATCH v7 15/23] dma-iommu: Implement NESTED_MSI cookie Eric Auger
2019-05-08 16:42 ` Robin Murphy
2019-04-08 12:19 ` Eric Auger [this message]
2019-04-08 12:19 ` [PATCH v7 17/23] iommu/smmuv3: Implement bind/unbind_guest_msi Eric Auger
2019-04-08 12:19 ` [PATCH v7 18/23] iommu/smmuv3: Report non recoverable faults Eric Auger
2019-05-08 17:20 ` Robin Murphy
2019-05-13 7:46 ` Auger Eric
2019-05-13 11:54 ` Robin Murphy
2019-05-13 12:32 ` Auger Eric
2019-05-13 13:47 ` Robin Murphy
2019-04-08 12:19 ` [PATCH v7 19/23] vfio-pci: Add a new VFIO_REGION_TYPE_NESTED region type Eric Auger
2019-04-08 12:19 ` [PATCH v7 20/23] vfio-pci: Register an iommu fault handler Eric Auger
2019-04-08 12:19 ` [PATCH v7 21/23] vfio_pci: Allow to mmap the fault queue Eric Auger
2019-04-08 12:19 ` [PATCH v7 22/23] vfio-pci: Add VFIO_PCI_DMA_FAULT_IRQ_INDEX Eric Auger
2019-04-08 12:19 ` [PATCH v7 23/23] vfio: Document nested stage control Eric Auger
2019-04-30 7:09 ` [PATCH v7 00/23] SMMUv3 Nested Stage Setup Auger Eric
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