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[Qemu-discuss] GPU passthrough - 64-bit MMIO (with OVMF)

From: Thomas Lamprecht
Subject: [Qemu-discuss] GPU passthrough - 64-bit MMIO (with OVMF)
Date: Mon, 15 Feb 2016 09:58:26 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0

Hi all,

I'm wondering if there is a possibility to pass through a big GPU like the NVIDIA Tesla K80 (with 24 GB ram). AFAIK, there is a problem with mapping that lot of memory which would need 64 bit MMIO
(or "above 4G mapping" feature, like some firmware are calling it).

So after some searching on the web I came to no clear answer and though simply asking here would be the best. I only found a post from about 2010 on the qemu-devel list [1] which stated that there isn't 64-bit MMIO support (yet), but also that it'd be useful. Was there any progress on this matter? If yes how could someone enable it (with OVMF?).

How is the support for passing through such Hardware, or in other word has anybody achieved this?
Maybe I should also note that smaller GPUs pass-through just fine.

best regards,

[1] https://lists.nongnu.org/archive/html/qemu-devel/2010-02/msg01106.html

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