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

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

--- Comment #11 from Paolo Bonzini <bonzini@gnu.org> ---
Created attachment 197071
  --> https://bugzilla.kernel.org/attachment.cgi?id=197071&action=edit
OVMF log

> 1) providing host dmesg

Of course this makes no sense, you already did.  And from the traces I suspect
that /proc/mtrr is the same on the two guests.  The culprit seems to be this
MTRR:

 qemu-system-x86-2228  [002]   127.763684: kvm_msr: msr_read 201 = 0xff80000800
 qemu-system-x86-2228  [002]   127.763685: kvm_msr: msr_read 200 = 0x80000000

which is set up by OVMF.  I'm attaching the OVMF output for reference (it can
be extracted from the traces with "trace-cmd report trace-3GBmem.dat |grep
0x402 | awk --non-decimal-data '{printf "%c", 0+$NF}' > OVMF.log").

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