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Re: [Qemu-ppc] [PATCH 10/12] spapr_pci: (Mostly) remove spapr-pci-vfio-h

From: Alexey Kardashevskiy
Subject: Re: [Qemu-ppc] [PATCH 10/12] spapr_pci: (Mostly) remove spapr-pci-vfio-host-bridge
Date: Mon, 29 Feb 2016 12:42:28 +1100
User-agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

On 02/26/2016 10:32 PM, David Gibson wrote:
Now that the regular spapr-pci-host-bridge can handle EEH, there are only
two things that spapr-pci-vfio-host-bridge does differently:
     1. automatically sizes its DMA window to match the host IOMMU
     2. checks if the attached VFIO container is backed by the
        VFIO_SPAPR_TCE_IOMMU type on the host

(1) is not particularly useful, since the default window used by the
regular host bridge will work with the host IOMMU configuration on all
current systems anyway.

Plus, automatically changing guest visible configuration (such as the DMA
window) based on host settings is generally a bad idea.

btw why exactly is it a bad idea?

Reviewed-by: Alexey Kardashevskiy <address@hidden>


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