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virtio-iommu: Handle reserved regions in the translation process

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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>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-id: 20200629070404.10969-4-eric.auger@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Eric Auger 2020-07-03 16:59:42 +01:00 committed by Peter Maydell
parent 1733eebb9e
commit 0f5a3092ee
1 changed files with 20 additions and 0 deletions
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20
hw/virtio/virtio-iommu.c
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@ -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",