It look like adding "hyperv" in "features" section to guest definition
helps, my Win7 VM now is running for ~12h, when without "hyperv" it was
like 3-4 hour. I will test it for few days and will post here again.
<features>
<acpi/>
<apic/>
<pae/>
<hyperv>
<relaxed state='on'/>
</hyperv>
</features>
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https://bugs.launchpad.net/bugs/1308341
Title:
Multiple CPUs causes blue screen on Windows guest
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