[Qemu-devel] Windows 7 guest not starting with HyperV features enabled

[Aleksei]

Hi,
I'm using libvirt, but folks on libvirt mailing list said it makes more 
sense to post here.

I have a Windows 7 SP1 Pro 64-bit VM which works fine on libvirt 2.3.0 
and Qemu 2.7.0.

If I enable HyperV features 
(https://libvirt.org/formatdomain.html#elementsFeatures) like "relaxed", 
"spinlocks" etc - VM doesn't boot. "Starting Windows" text appears for 
~2 seconds (no flying dots, no logo) and then it just goes to black 
screen. If I switch HyperV features back off, it boots normally again.

There are no logs for that attempted boot in the guest - apparently it 
doesn't get to the point when Windows starts logging. No errors logged 
in libvirt's win7.log either.

Attaching VM xml definition and libvirt-generated Qemu command line - 
only "relaxed" feature is enabled. VM fails with any feature in <hyperv> 
block enabled. Platform-specific values (smbios info etc) are replaced.
--
/--Regards, Aleksei/

qemu.sh
Description: application/shellscript

win7.xml
Description: Text Data