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spapr_iommu: Disable in-kernel IOMMU tables for >4GB windows 

The existing KVM_CREATE_SPAPR_TCE ioctl only support 4G windows max as
the window size parameter to the kernel ioctl() is 32-bit so
there's no way of expressing a TCE window > 4GB.

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.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexey Kardashevskiy 2015-05-07 15:33:28 +10:00 committed by Alexander Graf
parent 421b1b27f6
commit 12fd285358
1 changed files with 3 additions and 3 deletions
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6
hw/ppc/spapr_iommu.c
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@ -126,11 +126,11 @@ static MemoryRegionIOMMUOps spapr_iommu_ops = {
static int spapr_tce_table_realize(DeviceState *dev)
{
sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
uint64_t window_size = (uint64_t)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);
}