On Mon, Aug 27, 2018 at 10:47:51AM +0200, Jan Kiszka wrote:
> The AMD IOMMU does not (yet) support interrupt remapping. But
> kvm_arch_fixup_msi_route assumes that all implementations do and crashes
> when the AMD IOMMU is used in KVM mode.
>
> Fixes: 8b5ed7dffa1f ("intel_iommu: add support for split irqchip")
> Reported-by: Christopher Goldsworthy <christopher.goldswor...@outlook.com>
> Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
Reviewed-by: Michael S. Tsirkin <m...@redhat.com>
> ---
> target/i386/kvm.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/target/i386/kvm.c b/target/i386/kvm.c
> index 9313602d3d..1fe3a73a10 100644
> --- a/target/i386/kvm.c
> +++ b/target/i386/kvm.c
> @@ -3677,6 +3677,10 @@ int kvm_arch_fixup_msi_route(struct
> kvm_irq_routing_entry *route,
> MSIMessage src, dst;
> X86IOMMUClass *class = X86_IOMMU_GET_CLASS(iommu);
>
> + if (!class->int_remap) {
> + return 0;
> + }
> +
> src.address = route->u.msi.address_hi;
> src.address <<= VTD_MSI_ADDR_HI_SHIFT;
> src.address |= route->u.msi.address_lo;
> --
> 2.16.4
