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 <eric.auger@redhat.com>
---
v1 -> v2:
- use addr when testing addr belongs to the reserved region
and use a block local variable
---
hw/virtio/virtio-iommu.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c
index 35d772e021..ba72cfaa63 100644
--- a/hw/virtio/virtio-iommu.c
+++ b/hw/virtio/virtio-iommu.c
@@ -607,6 +607,7 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemoryRegion *mr, hwaddr addr,
uint32_t sid, flags;
bool bypass_allowed;
bool found;
+ int i;
interval.low = addr;
interval.high = addr + 1;
@@ -640,6 +641,25 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemoryRegion *mr, hwaddr addr,
goto unlock;
}
+ for (i = 0; i < s->nb_reserved_regions; i++) {
+ ReservedRegion *reg = &s->reserved_regions[i];
+
+ if (addr >= reg->low && addr <= reg->high) {
+ switch (reg->type) {
+ 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,
+ VIRTIO_IOMMU_FAULT_F_ADDRESS,
+ sid, addr);
+ break;
+ }
+ goto unlock;
+ }
+ }
+
if (!ep->domain) {
if (!bypass_allowed) {
error_report_once("%s %02x:%02x.%01x not attached to any domain",
--
2.20.1