Starting the following command line causes a segfault qemu-system-x86_64 -S -machine isapc,accel=kvm -device intel-iommu
This is due to the fact that the machine type 'isapc' doesn't have a PCI bus, while intel_iommu doesn't check if the machine has PCI support and subsequently does a null-pointer access. Intel IOMMU shouldn't even work if the target machine doesn't have PCI. Add a check for PCI on the given machine type and return an error if PCI is not supported. Signed-off-by: Mohammed Gamal <mga...@redhat.com> --- hw/i386/intel_iommu.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index 3a5bb0b..fab0b4b 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -3041,6 +3041,13 @@ static void vtd_realize(DeviceState *dev, Error **errp) } bus = pcms->bus; + + if (!bus) { + error_setg(errp, "Machine-type '%s' does not support PCI", + mc->name); + return; + } + x86_iommu->type = TYPE_INTEL; if (!vtd_decide_config(s, errp)) { -- 1.8.3.1