All - I am running a virtual windows 7 (pro 64) on centos 5.5 x86_64. I was hoping to run virtual XP inside windows7 in this configuration.
I get an error about cannot start virtual XP when I try this. Do I not have something setup correctly or can I not run a "double" virtual environment?
Thanks,
Jerry
On Tue, 4 Jan 2011, Jerry Geis wrote:
All - I am running a virtual windows 7 (pro 64) on centos 5.5 x86_64. I was hoping to run virtual XP inside windows7 in this configuration.
I get an error about cannot start virtual XP when I try this. Do I not have something setup correctly or can I not run a "double" virtual environment?
I'd be very surprised if that would work. The virtual environments check for the correct processor type. A "virtual cpu" is probably not on the list..
---------------------------------------------------------------------- Jim Wildman, CISSP, RHCE jim@rossberry.com http://www.rossberry.com "Society in every state is a blessing, but Government, even in its best state, is a necessary evil; in its worst state, an intolerable one." Thomas Paine
On Wed, Jan 5, 2011 at 6:13 AM, Jim Wildman jim@rossberry.com wrote:
On Tue, 4 Jan 2011, Jerry Geis wrote:
All - I am running a virtual windows 7 (pro 64) on centos 5.5 x86_64. I was hoping to run virtual XP inside windows7 in this configuration.
I get an error about cannot start virtual XP when I try this. Do I not have something setup correctly or can I not run a "double" virtual environment?
I'd be very surprised if that would work. The virtual environments check for the correct processor type. A "virtual cpu" is probably not on the list..
I have not tried a VM within a VM (nested) although I have heard that it is possible.
I guess the correct processor type could be passed with the "-cpu " parameter.
-- Arun Khan
On Tue, 4 Jan 2011, Jerry Geis wrote:
All - I am running a virtual windows 7 (pro 64) on centos 5.5 x86_64. I was hoping to run virtual XP inside windows7 in this configuration.
I get an error about cannot start virtual XP when I try this. Do I not have something setup correctly or can I not run a "double" virtual environment?
In general, it is not possible to nest virtualization environments. The hypervisor needs to trap certain events/interrupts and reserve certain instructions to manage the guest OS. As such, those are not available to the guest OS, therefore it cannot be a hypervisor itself.
You *might* be able to run an emulator (bochs, qemu, etc) within the guest OS, but the performance would be something close to abominable. I'd say you're better off running two guests, one of Win7 and one of WinXP, and use some other mechanism (virtual network) to let them communicate.
-- Mitch
Mitch Patenaude wrote:
On Tue, 4 Jan 2011, Jerry Geis wrote:
All - I am running a virtual windows 7 (pro 64) on centos 5.5
x86_64.
I was hoping to run virtual XP inside windows7 in this configuration.
I get an error about cannot start virtual XP when I try this. Do I not have something setup correctly or can I not run a "double" virtual environment?
In general, it is not possible to nest virtualization environments.
<snip> I'd add that all you need to do, if you could get this working, is to open a command window, and you'd have *exactly* the same performance as if you were running the original PC, on an 8088 with the o/s loaded from floppy drives....
mark
I have not tried a VM within a VM (nested) although I have heard that it is possible.
I guess the correct processor type could be passed with the "-cpu " parameter.
-- Arun Khan
I have tried "-cpu phenum" which does not run at all. and I tried "-cpu core2duo" which runs the guest but does not run the VM within a VM.
Thanks,
Jerry
From what I remember "-cpu" is to tell the vm what cpu extensions are
available. I always just use "-cpu host" which has kvm pass in all the cpu extensions that the host processor has.
Using WindowsXP mode on a windows 7 VM sounds dirty. XP mode used to require virtualization hardware, now it doesn't. Perhaps passing in a cpu that doesn't have virtualization extensions is the way to make windows go the non-hardware route. I would expect the performance to be abysmal, but it would be a neat trick.
Patrick
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Jerry Geis Sent: Wednesday, January 05, 2011 8:09 AM To: CentOS ML Subject: Re: [CentOS] using kvm
I have not tried a VM within a VM (nested) although I have heard
that
it is possible.
I guess the correct processor type could be passed with the "-cpu "
parameter.
-- Arun Khan
I have tried "-cpu phenum" which does not run at all. and I tried "-cpu core2duo" which runs the guest but does not run the VM within a VM.
Thanks,
Jerry
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
On Tue, Jan 4, 2011 at 2:01 PM, Jerry Geis geisj@pagestation.com wrote:
All - I am running a virtual windows 7 (pro 64) on centos 5.5 x86_64. I was hoping to run virtual XP inside windows7 in this configuration.
I get an error about cannot start virtual XP when I try this. Do I not have something setup correctly or can I not run a "double" virtual environment?
I don't have an answer to your question, but curious as to how the virtual XP is running inside Win7. Does it use an entire virtualization layer or is it something similar to Wine's approach?
-
Arun Khan -
Flaherty, Patrick -
Jerry Geis -
Jim Wildman -
Kwan Lowe -
m.roth＠5-cent.us -
Mitch Patenaude