[Win7 w/o SP1] VMM: openSUSE 13.2 boot failed on Windows

[Technologov]

Host: Win 7 x64 + BETA4. (same with BETA3)
Guest: openSUSE 13.2 64-bit (and also 32-bit) Kernel 3.16.x
Was working on host: Win 7 x64 + BETA2. (same PC; XRig)

Could it be related to AVX and XSAVE functionality ?

NOTE: openSUSE 13.2 32-bit guest works if I disable VT-x.
NOTE2: Not always reproducible.

[Technologov]

What about this ?

[Technologov]

Possibly related to bug : "Fedora Linux guest hangs on startup"
viewtopic.php?f=15&t=68045

NOTE: This is only sometimes reproducible only on Windows hosts; I was unable to reproduce this bug on Debian Linux 6 host. (if it's possible, maybe my VM settings on Linux hosts were different)

[bird]

Unable to reproduce here with current trunk (yes, windows host).
-bird

PS. The xor module seems to be used by btrfs. If Fedora 22 is using btrfs or something else requring the xor module, yes, maybe it's related.

[Technologov]

I still experience this bug with RC1.

Tried to re-install openSUSE 13.2 x64 : kernel crashed on "Loading kernel modules for hard disk controllers..."
Changing HDD controller from SATA to IDE didn't help.

[Technologov]

Host: Windows 7 x64, v5.0-RC1

UPDATE:
VMX Nested Paging is to blame. Disabling Intel EPT did help. Was able to boot openSUSE guest !
Moreover, BETA2 doesn't suffer from this defect. Boots fine with EPT.

The question is: what was changed between BETA2 and BETA3/RC1 regarding to VMX/MMU/VT-x side of things? (only AVX ?)
Things stopped working since BETA3.

[loukingjr]

I can't reproduce the error with my Windows 8.1, OSX or Linux hosts. Could it be KDE? I am running Gnome with OpenSUSE 13.2.

[Technologov]

loukingjr: I can't reproduce it with Linux hosts also. I think this is Windows hosts + Intel EPT issue.

Not related to KDE, because openSUSE kernel crashes on boot -and- even during install. Only Yast works during install, no KDE. Not related to disk controller either. And not to PV. I set PV = disabled.

You say you can't reproduce it on Windows 8.1 also ? Then no ideas.

[loukingjr]

No, not on WIndows 8.1. Maybe it's just with Windows 7. I don't have a Windows 7 host to check.

[Technologov]

Update: my other host with Windows 7 x64 works fine.

Summary:
Host 1: (XRig) Intel Core i7 2600K + Windows 7 x64 - FAILs, hmm? (worked with BETA2 or with RC1+EPT disabled)
Host 2: (XRig) Intel Core i7 2600K + Debian Linux 6 - Works !
Host 3: (Portege) Intel Core i7 4600U + Windows 7 x64 - Works !
Host 4: (Dell) Intel Core i7 4510U + Windows 7 x64 - Works !
Host 5: (ASUS) Intel Core i3 2100 + Windows 7 x64 - Works !

[loukingjr]

interesting. I guess it's time to track down why one works and one doesn't.

[Technologov]

If there is any test-build attempt to fix this, I'd be glad to know.

[Technologov]

Any ideas?

[Technologov]

How do we solve this one ?

[Technologov]

Problem still exists with RC2a.