[Bug 196409] kvm_amd nested pagetable gpu passthrough performance oddities

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https://bugzilla.kernel.org/show_bug.cgi?id=196409

mfadom99@xxxxxxxxxxx changed:

           What    |Removed                     |Added
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                 CC|                            |mfadom99@xxxxxxxxxxx

--- Comment #7 from mfadom99@xxxxxxxxxxx ---
Same issue with kernel 4.10 - 4.12 here.

CPU - AMD Ryzen 7 1700
MB - Asus Prime x370 Pro
Host GPU - NVidia GTX 750ti
VFIO GPU - AMD Radeon RX480
Host OS - Manjaro 17.2
Guest OS - Windows 10

With npt=1, everything is fast, except GPU fps is 10-15 in Skyrim
with npt=0, everything is slow, GPU fps is ~30 in Skyrim

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