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Groups > linux.kernel > #1705177

[RFC PATCH v5 4/5] powerpc/iommu: Set IOMMU_GROUP_CAP_ISOLATE_MSIX

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This sets IOMMU_GROUP_CAP_ISOLATE_MSIX to a group unconditionally as
there is no IOMMU-capable hardware without such a feature.

On IBM POWERPC (POWER8) [1], PCI host bridge maintains BFDN-to-PE
translation (PE stands for "partitionable endpoint"), and PE index is used
to look at Interrupt Vector Table (IVT) to identify the interrupt server.
Without these translations in place, MSIX messages won't pass PHB.

[1] 3.2.4. MSI Design
http://openpowerfoundation.org/wp-content/uploads/resources/IODA2Spec/IODA2WGSpec-1.0.0-20160217.pdf

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
 arch/powerpc/kernel/iommu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index 233ca3fe4754..dca0a83f1560 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -936,6 +936,7 @@ void iommu_register_group(struct iommu_table_group *table_group,
 	if (!name)
 		return;
 	iommu_group_set_name(grp, name);
+	iommu_group_set_caps(grp, 0, IOMMU_GROUP_CAP_ISOLATE_MSIX);
 	kfree(name);
 }
 
-- 
2.11.0

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[RFC PATCH v5 0/5] vfio-pci: Add support for mmapping MSI-X table Alexey Kardashevskiy <aik@ozlabs.ru> - 2017-08-07 09:40 +0200
  [RFC PATCH v5 3/5] iommu/intel/amd: Set IOMMU_GROUP_CAP_ISOLATE_MSIX if IRQ remapping is enabled Alexey Kardashevskiy <aik@ozlabs.ru> - 2017-08-07 09:40 +0200
  [RFC PATCH v5 4/5] powerpc/iommu: Set IOMMU_GROUP_CAP_ISOLATE_MSIX Alexey Kardashevskiy <aik@ozlabs.ru> - 2017-08-07 09:40 +0200
  [RFC PATCH v5 5/5] vfio-pci: Allow to expose MSI-X table to userspace when safe Alexey Kardashevskiy <aik@ozlabs.ru> - 2017-08-07 09:50 +0200
    Re: [RFC PATCH v5 5/5] vfio-pci: Allow to expose MSI-X table to  userspace when safe David Gibson <david@gibson.dropbear.id.au> - 2017-08-09 09:10 +0200

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