[Bug 200877] Low 2D graphics performance with Windows 10 (1803) VGA passthrough VM using "Spectre" protection

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https://bugzilla.kernel.org/show_bug.cgi?id=200877

--- Comment #4 from Georgios Amanakis (g_amanakis@xxxxxxxxx) ---


I did a git-bisect between 4.14.18(bad) and 4.14.10(good). Unsurprisingly, this
is the first "bad" commit:

  KVM/VMX: Allow direct access to MSR_IA32_SPEC_CTRL

  commit d28b387fb74da95d69d2615732f50cceb38e9a4d

George

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