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[RFC v7 03/26] memory: Add IOMMU_ATTR_VFIO_NESTED IOMMU memory region at
From: |
Eric Auger |
Subject: |
[RFC v7 03/26] memory: Add IOMMU_ATTR_VFIO_NESTED IOMMU memory region attribute |
Date: |
Mon, 16 Nov 2020 19:13:26 +0100 |
We introduce a new IOMMU Memory Region attribute,
IOMMU_ATTR_VFIO_NESTED that tells whether the virtual IOMMU
requires HW nested paging for VFIO integration.
Current Intel virtual IOMMU device supports "Caching
Mode" and does not require 2 stages at physical level to be
integrated with VFIO. However SMMUv3 does not implement such
"caching mode" and requires to use HW nested paging.
As such SMMUv3 is the first IOMMU device to advertise this
attribute.
Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
include/exec/memory.h | 3 ++-
hw/arm/smmuv3.c | 12 ++++++++++++
2 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/include/exec/memory.h b/include/exec/memory.h
index 0f3e6bcd5e..d9261337c1 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -223,7 +223,8 @@ typedef struct MemoryRegionClass {
enum IOMMUMemoryRegionAttr {
- IOMMU_ATTR_SPAPR_TCE_FD
+ IOMMU_ATTR_SPAPR_TCE_FD,
+ IOMMU_ATTR_VFIO_NESTED,
};
/*
diff --git a/hw/arm/smmuv3.c b/hw/arm/smmuv3.c
index 22607c3784..4b33e14153 100644
--- a/hw/arm/smmuv3.c
+++ b/hw/arm/smmuv3.c
@@ -1512,6 +1512,17 @@ static int smmuv3_notify_flag_changed(IOMMUMemoryRegion
*iommu,
return 0;
}
+static int smmuv3_get_attr(IOMMUMemoryRegion *iommu,
+ enum IOMMUMemoryRegionAttr attr,
+ void *data)
+{
+ if (attr == IOMMU_ATTR_VFIO_NESTED) {
+ *(bool *) data = true;
+ return 0;
+ }
+ return -EINVAL;
+}
+
static void smmuv3_iommu_memory_region_class_init(ObjectClass *klass,
void *data)
{
@@ -1519,6 +1530,7 @@ static void
smmuv3_iommu_memory_region_class_init(ObjectClass *klass,
imrc->translate = smmuv3_translate;
imrc->notify_flag_changed = smmuv3_notify_flag_changed;
+ imrc->get_attr = smmuv3_get_attr;
}
static const TypeInfo smmuv3_type_info = {
--
2.21.3
- [RFC v7 00/26] vSMMUv3/pSMMUv3 2 stage VFIO integration, Eric Auger, 2020/11/16
- [RFC v7 01/26] update-linux-headers: Import iommu.h, Eric Auger, 2020/11/16
- [RFC v7 02/26] header update against 5.10-rc4 and IOMMU/VFIO nested stage APIs, Eric Auger, 2020/11/16
- [RFC v7 03/26] memory: Add IOMMU_ATTR_VFIO_NESTED IOMMU memory region attribute,
Eric Auger <=
- [RFC v7 04/26] memory: Add IOMMU_ATTR_MSI_TRANSLATE IOMMU memory region attribute, Eric Auger, 2020/11/16
- [RFC v7 05/26] memory: Introduce IOMMU Memory Region inject_faults API, Eric Auger, 2020/11/16
- [RFC v7 06/26] memory: Add arch_id and leaf fields in IOTLBEntry, Eric Auger, 2020/11/16
- [RFC v7 07/26] iommu: Introduce generic header, Eric Auger, 2020/11/16
- [RFC v7 08/26] pci: introduce PCIPASIDOps to PCIDevice, Eric Auger, 2020/11/16
- [RFC v7 09/26] vfio: Force nested if iommu requires it, Eric Auger, 2020/11/16
- [RFC v7 10/26] vfio: Introduce hostwin_from_range helper, Eric Auger, 2020/11/16
- [RFC v7 11/26] vfio: Introduce helpers to DMA map/unmap a RAM section, Eric Auger, 2020/11/16
- [RFC v7 12/26] vfio: Set up nested stage mappings, Eric Auger, 2020/11/16
- [RFC v7 13/26] vfio: Pass stage 1 MSI bindings to the host, Eric Auger, 2020/11/16