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[Qemu-devel] [PATCH for-4.2 v10 13/15] virtio_iommu: Handle reserved reg
From: |
Eric Auger |
Subject: |
[Qemu-devel] [PATCH for-4.2 v10 13/15] virtio_iommu: Handle reserved regions in translation process |
Date: |
Tue, 30 Jul 2019 19:21:35 +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>
---
v9 -> v10:
- in case of MSI region, we immediatly return
---
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 8e54a17227..20d92b7ab0 100644
--- a/hw/virtio/virtio-iommu.c
+++ b/hw/virtio/virtio-iommu.c
@@ -711,6 +711,7 @@ static IOMMUTLBEntry
virtio_iommu_translate(IOMMUMemoryRegion *mr, hwaddr addr,
viommu_interval interval;
bool bypass_allowed;
bool read_fault, write_fault;
+ struct virtio_iommu_probe_resv_mem *reg;
interval.low = addr;
interval.high = addr + 1;
@@ -743,6 +744,21 @@ 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;
+ return entry;
+ 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) {
if (!bypass_allowed) {
qemu_log_mask(LOG_GUEST_ERROR,
--
2.20.1
- [Qemu-devel] [PATCH for-4.2 v10 06/15] virtio-iommu: Endpoint and domains structs and helpers, (continued)
- [Qemu-devel] [PATCH for-4.2 v10 06/15] virtio-iommu: Endpoint and domains structs and helpers, Eric Auger, 2019/07/30
- [Qemu-devel] [PATCH for-4.2 v10 07/15] virtio-iommu: Implement attach/detach command, Eric Auger, 2019/07/30
- [Qemu-devel] [PATCH for-4.2 v10 08/15] virtio-iommu: Implement map/unmap, Eric Auger, 2019/07/30
- [Qemu-devel] [PATCH for-4.2 v10 09/15] virtio-iommu: Implement translate, Eric Auger, 2019/07/30
- [Qemu-devel] [PATCH for-4.2 v10 10/15] virtio-iommu: Implement probe request, Eric Auger, 2019/07/30
- [Qemu-devel] [PATCH for-4.2 v10 11/15] virtio-iommu: Expose the IOAPIC MSI reserved region when relevant, Eric Auger, 2019/07/30
- [Qemu-devel] [PATCH for-4.2 v10 12/15] virtio-iommu: Implement fault reporting, Eric Auger, 2019/07/30
- [Qemu-devel] [PATCH for-4.2 v10 13/15] virtio_iommu: Handle reserved regions in translation process,
Eric Auger <=
- [Qemu-devel] [PATCH for-4.2 v10 14/15] virtio-iommu-pci: Add virtio iommu pci support, Eric Auger, 2019/07/30
- [Qemu-devel] [PATCH for-4.2 v10 15/15] hw/arm/virt: Add the virtio-iommu device tree mappings, Eric Auger, 2019/07/30