The existing KVM_CREATE_SPAPR_TCE ioctl only support 4G windows max.
We are going to add huge DMA windows support so this will create small
window and unexpectedly fail later.
This disables KVM_CREATE_SPAPR_TCE for windows bigger that 4GB. Since
those windows are normally mapped at the boot time, there will be no
performance impact.
Signed-off-by: Alexey Kardashevskiy <a...@ozlabs.ru>
---
hw/ppc/spapr_iommu.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/hw/ppc/spapr_iommu.c b/hw/ppc/spapr_iommu.c
index f6e32a4..36f5d27 100644
--- a/hw/ppc/spapr_iommu.c
+++ b/hw/ppc/spapr_iommu.c
@@ -113,11 +113,11 @@ static MemoryRegionIOMMUOps spapr_iommu_ops = {
static int spapr_tce_table_realize(DeviceState *dev)
{
sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
+ uint64_t window_size = tcet->nb_table << tcet->page_shift;
- if (kvm_enabled()) {
+ if (kvm_enabled() && !(window_size >> 32)) {
tcet->table = kvmppc_create_spapr_tce(tcet->liobn,
- tcet->nb_table <<
- tcet->page_shift,
+ window_size,
&tcet->fd,
tcet->vfio_accel);
}
--
2.0.0
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