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Re: [Qemu-arm] [PATCH v6 0/8] AMD XGBE KVM platform passthrough

From: Eric Auger
Subject: Re: [Qemu-arm] [PATCH v6 0/8] AMD XGBE KVM platform passthrough
Date: Thu, 18 Feb 2016 18:59:22 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1

On 02/17/2016 08:59 PM, Alex Williamson wrote:
> On Tue, 16 Feb 2016 18:40:47 +0000
> Peter Maydell <address@hidden> wrote:
>> On 1 February 2016 at 13:51, Eric Auger <address@hidden> wrote:
>>> This series allows to set up AMD XGBE passthrough. This was tested on AMD
>>> Seattle.
>>> The first upstreamed device supporting KVM platform passthrough was the
>>> Calxeda Midway XGMAC. Compared to this latter, the XGBE XGMAC exposes a
>>> much more complex device tree node.
>>> - First There are 2 device tree node formats:
>>> one where XGBE and PHY are described in separate nodes and another one
>>> that combines both description in a single node (only supported by 4.2
>>> onwards kernels). Only the combined description is supported for 
>>> passthrough,
>>> meaning the host must be >= 4.2 and must feature a device tree with a 
>>> combined
>>> description. The guest will also be exposed with a combined description,
>>> meaning only >= 4.2 guest are supported. It is not planned to support
>>> separate node representation since assignment of the PHY is less
>>> straigtforward.
>>> - the XGMAC/PHY node depends on 2 clock nodes (DMA and PTP).
>>> The code checks those clocks are fixed to make sure they cannot be
>>> switched off at some point after the native driver gets unbound.
>>> - there are many property values to populate on guest side. Most of them
>>> cannot be hardcoded. That series implements host device tree blob extraction
>>> from the host /proc/device-tree (inspired from dtc implementation)
>>> and retrieve host property values to populate guest dtb.
>>> - the case where the host uses ACPI is not yet covered since there is
>>>   no usable ACPI description for this HW yet.
>>> The patches can be found at
>>> https://git.linaro.org/people/eric.auger/qemu.git/shortlog/refs/heads/v2.5.0-xgbe-v6
>>> Previous versions can be found at
>>> https://git.linaro.org/people/eric.auger/qemu.git/shortlog/refs/heads/v2.5.0-xgbe-v<n>
>> I think you have review on everything in this series now, but I'm assuming
>> this is going to go via the vfio tree (or at any rate not via target-arm).
>> Let me know if that's wrong.
> The little bit of vfio here looks ok to me too.  Eric, this doesn't
> apply cleanly, could you please rebase and incorporate all the acks and
> reviews and I'll send a pull request with it?  Thanks,

Thanks Peter for the last R-b's. Alex, I rebased and sent v7. Once
pulled I will update the qemu wiki.


> Alex

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