Bug 8894

Summary:	kvm-amd causes win98 VM to hang
Product:	Drivers	Reporter:	Marius Mauch (genone)
Component:	Other	Assignee:	drivers_other
Status:	CLOSED INSUFFICIENT_DATA
Severity:	normal	CC:	alan, protasnb
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.24	Subsystem:
Regression:	No	Bisected commit-id:

Description Marius Mauch 2007-08-16 07:52:14 UTC

Most recent kernel where this bug did not occur: unknown
Distribution: Gentoo
Hardware Environment: Athlon 64 X2
Software Environment: kvm-35, win98 VM
Problem Description:
This problem was first reported on http://bugs.gentoo.org/show_bug.cgi?id=187812

With kernel 2.6.23_rc2 (and 2.6.22.1) loading a win98 virtual machine with kvm-35 (and kvm-31) results in the VM hanging with a black screen during startup (after scandisk, but before the desktop appears if that's of any help). The VM works fine if KVM is disabled (either with -no-kvm or /dev/kvm not being available). When the VM hangs, top reports 100% "sys" cpu usage (but that would be normal with a win98 VM).

Unfortunately I haven't been able to reproduce this problem with a freely available VM so far (freedos and linux VMs from http://fabrice.bellard.free.fr/qemu/download.html booted fine with KVM enabled).

Please let me know if you need further information or want me to test anything specific.

Comment 1 Natalie Protasevich 2008-02-10 20:18:30 UTC

Marius,
Have you tested this since with new kernel/KVM? and have you filed your bug on the KVM mailing list https://lists.sourceforge.net/lists/listinfo/kvm-devel/ ? If not, I can forward the bug to this list.
Thanks.

Comment 2 Marius Mauch 2008-02-18 20:47:44 UTC

(In reply to comment #1)
> Marius,
> Have you tested this since with new kernel/KVM? and have you filed your bug
> on
> the KVM mailing list https://lists.sourceforge.net/lists/listinfo/kvm-devel/
> ?
> If not, I can forward the bug to this list.

Still reproducible here with kernel 2.6.24 and kvm-59 (with modules from kernel and kvm), except that the black screen is replaced by the windows boot splashscreen in the kvm+kvm combination (but it still hangs indefinitely).
One thing I forgot to mention in the first comment is that the mentioned kvm versions refer only the the userspace parts, the modules came from the mentioned kernel versions.
One more thing is that booting to the DOS prompt in the same VM works fine with KVM, but failsafe mode does not (don't know if that information is useful).

Forwarding the bug to the right people would be nice, thanks.

Comment 3 Alan 2009-03-23 11:31:48 UTC

Is this still the case with 2.6.28 ?