Re: [Qemu-devel] [PATCH RESEND 2/2] x86_iommu: check if machine has PCI bus

[Thomas Huth]

On 29.11.2017 13:33, Mohammed Gamal wrote:
> Starting qemu with
> qemu-system-x86_64 -S -M isapc -device {amd|intel}-iommu
> leads to a segfault. The code assume PCI bus is present and
> tries to access the bus structure without checking.
> 
> Since Intel VT-d and AMDVI should only work with PCI, add a
> check for PCI bus and return error if not present.
> 
> Reviewed-by: Peter Xu <address@hidden>
> Reviewed-by: Eduardo Habkost <address@hidden>
> Signed-off-by: Mohammed Gamal <address@hidden>
> ---
>  hw/i386/x86-iommu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/hw/i386/x86-iommu.c b/hw/i386/x86-iommu.c
> index 51de519..8a01a2d 100644
> --- a/hw/i386/x86-iommu.c
> +++ b/hw/i386/x86-iommu.c
> @@ -88,7 +88,7 @@ static void x86_iommu_realize(DeviceState *dev, Error 
> **errp)
>          PC_MACHINE(object_dynamic_cast(OBJECT(ms), TYPE_PC_MACHINE));
>      QLIST_INIT(&x86_iommu->iec_notifiers);
>  
> -    if (!pcms) {
> +    if (!pcms || !pcms->bus) {
>          error_setg(errp, "Machine-type '%s' not supported by IOMMU",
>                     mc->name);
>          return;
> 

Reviewed-by: Thomas Huth <address@hidden>