[Bug 107561] 4.2 breaks PCI passthrough in QEMU/KVM

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https://bugzilla.kernel.org/show_bug.cgi?id=107561

--- Comment #9 from Paolo Bonzini <bonzini@xxxxxxx> ---
Can you try the following on HostA:

1) providing *host* dmesg

2) disabling each MTRR starting from the first, until things are fast again. 
Then reboot and try disabling only the MTRR that made things fast again.

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