Re: [Qemu-devel] [PATCH v4 3/3] intel_iommu: allow UNMAP notifiers

[David Gibson <david@gibson.dropbear.id.au>]

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On Fri, Sep 09, 2016 at 10:57:44AM +0800, Peter Xu wrote:
> Intel vIOMMU is still lacking of a complete IOMMU notifier mechanism.
> Before that is achieved, let's open a door for vhost DMAR support, which
> only requires cache invalidations (UNMAP operations).
> 
> Meanwhile, converting hw_error() to error_report() and exit(1), to make
> the error messages clean and obvious (so no CPU registers will be
> dumped).

Ah, you can scratch the comment I made about this in the previous
patch, I hadn't realised this just threw an error at present.

> 
> Signed-off-by: Peter Xu <peterx@redhat.com>

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>

> ---
>  hw/i386/intel_iommu.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
> index 9d49be7..e4c3681 100644
> --- a/hw/i386/intel_iommu.c
> +++ b/hw/i386/intel_iommu.c
> @@ -1980,10 +1980,14 @@ static void vtd_iommu_notify_flag_changed(MemoryRegion *iommu,
>  {
>      VTDAddressSpace *vtd_as = container_of(iommu, VTDAddressSpace, iommu);
>  
> -    hw_error("Device at bus %s addr %02x.%d requires iommu notifier which "
> -             "is currently not supported by intel-iommu emulation",
> -             vtd_as->bus->qbus.name, PCI_SLOT(vtd_as->devfn),
> -             PCI_FUNC(vtd_as->devfn));
> +    if (new & IOMMU_NOTIFIER_MAP) {
> +        error_report("Device at bus %s addr %02x.%d requires iommu "
> +                     "notifier which is currently not supported by "
> +                     "intel-iommu emulation",
> +                     vtd_as->bus->qbus.name, PCI_SLOT(vtd_as->devfn),
> +                     PCI_FUNC(vtd_as->devfn));
> +        exit(1);
> +    }
>  }
>  
>  static const VMStateDescription vtd_vmstate = {

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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