Re: [Qemu-devel] [RFC PATCH v3 03/18] spapr_iommu: Disable in-kernel IOMMU tables for >4GB windows

[David Gibson]

On Fri, Aug 29, 2014 at 08:12:07PM +1000, Alexey Kardashevskiy wrote:
> 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. Since
> those windows are normally mapped at the boot time, there will be no
> performance impact.
> 
> Signed-off-by: Alexey Kardashevskiy <address@hidden>

Reviewed-by: David Gibson <address@hidden>

-- 
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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