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[Qemu-arm] [RFC v7 12/16] virtio_iommu: Handle reserved regions in trans
From: |
Eric Auger |
Subject: |
[Qemu-arm] [RFC v7 12/16] virtio_iommu: Handle reserved regions in translation process |
Date: |
Mon, 6 Aug 2018 22:14:40 +0200 |
When translating an address we need to check if it belongs to
a reserved virtual address range. If it does, there are 2 cases:
- it belongs to a RESERVED region: the guest should neither use
this address in a MAP not instruct the end-point to DMA on
them. We report an error
- It belongs to an MSI region: we bypass the translation.
Signed-off-by: Eric Auger <address@hidden>
---
hw/virtio/virtio-iommu.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c
index 7b77b3b..6a1d214 100644
--- a/hw/virtio/virtio-iommu.c
+++ b/hw/virtio/virtio-iommu.c
@@ -749,6 +749,7 @@ static IOMMUTLBEntry
virtio_iommu_translate(IOMMUMemoryRegion *mr, hwaddr addr,
viommu_mapping *mapping;
viommu_interval interval;
bool read_fault, write_fault;
+ struct virtio_iommu_probe_resv_mem *reg;
interval.low = addr;
interval.high = addr + 1;
@@ -774,6 +775,21 @@ static IOMMUTLBEntry
virtio_iommu_translate(IOMMUMemoryRegion *mr, hwaddr addr,
goto unlock;
}
+ reg = g_tree_lookup(ep->reserved_regions, (gpointer)(&interval));
+ if (reg) {
+ switch (reg->subtype) {
+ case VIRTIO_IOMMU_RESV_MEM_T_MSI:
+ entry.perm = flag;
+ break;
+ case VIRTIO_IOMMU_RESV_MEM_T_RESERVED:
+ default:
+ virtio_iommu_report_fault(s, VIRTIO_IOMMU_FAULT_R_MAPPING,
+ 0, sid, addr);
+ break;
+ }
+ goto unlock;
+ }
+
if (!ep->domain) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s %02x:%02x.%01x not attached to any domain\n",
--
2.5.5
- [Qemu-arm] [RFC v7 03/16] virtio-iommu: Decode the command payload, (continued)
- [Qemu-arm] [RFC v7 03/16] virtio-iommu: Decode the command payload, Eric Auger, 2018/08/06
- [Qemu-arm] [RFC v7 04/16] virtio-iommu: Add the iommu regions, Eric Auger, 2018/08/06
- [Qemu-arm] [RFC v7 06/16] virtio-iommu: Implement attach/detach command, Eric Auger, 2018/08/06
- [Qemu-arm] [RFC v7 05/16] virtio-iommu: Endpoint and domains structs and helpers, Eric Auger, 2018/08/06
- [Qemu-arm] [RFC v7 07/16] virtio-iommu: Implement map/unmap, Eric Auger, 2018/08/06
- [Qemu-arm] [RFC v7 08/16] virtio-iommu: Implement translate, Eric Auger, 2018/08/06
- [Qemu-arm] [RFC v7 10/16] virtio-iommu: Add an msi_bypass property, Eric Auger, 2018/08/06
- [Qemu-arm] [RFC v7 09/16] virtio-iommu: Implement probe request, Eric Auger, 2018/08/06
- [Qemu-arm] [RFC v7 11/16] virtio-iommu: Implement fault reporting, Eric Auger, 2018/08/06
- [Qemu-arm] [RFC v7 13/16] qdev: export qbus_find_recursive, Eric Auger, 2018/08/06
- [Qemu-arm] [RFC v7 12/16] virtio_iommu: Handle reserved regions in translation process,
Eric Auger <=
- [Qemu-arm] [RFC v7 14/16] hw/arm/virt: Add virtio-iommu to the virt board, Eric Auger, 2018/08/06
- [Qemu-arm] [RFC v7 15/16] hw/arm/virt-acpi-build: Add virtio-iommu node in IORT table, Eric Auger, 2018/08/06
- [Qemu-arm] [RFC v7 16/16] hw/arm/virt: Allow virtio-iommu instantiation, Eric Auger, 2018/08/06