Re: freedos under qemu failure with nvmm

[Ramiro Aceves <ea1abz%gmail.com@localhost>]

El 13/11/25 a las 19:19, Vitaly Shevtsov escribió:
> Hello. I faced the same issue with qemu, nvmm and freedos. Tried to 
> debug with no luck. I found a workaround - run qemu with no 
> acceleration, install freedos, then run it with acceleration turned on. 
> This issue only happens when is it is being installed.
>
> чт, 13 нояб. 2025 г., 23:15 Ramiro Aceves <ea1abz%gmail.com@localhost 
> <mailto:ea1abz%gmail.com@localhost>>:
>
>
>     Hello,
>
>     I tried to install FreeDOS under Qemu in NetBSD 10.1 using nvmm
>     acceleration driver.
>
>
>     I get an error like this when almost installed on the virtual disk:
>
>     qemu-system-i386: NVMM: Unexpected VM exit code 0xffffffffffffffff
>     [hw=0x9]
>     qemu-system-i386: NVMM: Failed to execute a VCPU.
>     [1]   Abort trap (core dumped) qemu-system-i386 -m 64 -accel nvmm -
>     smp 1
>     -dri...
>
>
>     I removed nvmm acceleration and I was able to end the installation
>     without acceleration but it was painly slow.
>
>     I have been able to virtualize a full Debian GNU/Linux system using
>     nvmm, no problems at all. Why nvmm fails with FreeDOS?
>
>     Thanks so much.
>     Ramiro.

Hello Vitaly,

I have started the virtual FreeDOS with nvmm, it starts fast and well.


c:\dir (file listing works fine)

But when I start an editor:


c:\EDIT

qemu-system-i386: NVMM: Failed to execute a VCPU.
[1]   Abort trap (core dumped) qemu-system-i386 -m 64 -accel nvmm -smp 1 
-dri...
netbsd-nuc$


Regards.
Ramiro.


>