Re: freedos under qemu failure with nvmm

[Vitaly Shevtsov <shev.vt1984%gmail.com@localhost>]

Oh... I hadn't seen your next message that dosbox is crashing.

On Sat, Nov 15, 2025 at 1:52 PM Vitaly Shevtsov <shev.vt1984%gmail.com@localhost> wrote:
>
> Hello, Ramiro.
>
> I don't know the reason. It looks like FreeDOS uses something that
> other OSes don't use causing QEMU to crash.
> But for me it happens only when FreeDOS is being installed. Once it's
> installed I never face this issue. I'm pretty sure it's a bug in NVMM.
> Maybe it's worth trying dosbox instead?
>
> On Thu, Nov 13, 2025 at 11:29 PM Ramiro Aceves <ea1abz%gmail.com@localhost> wrote:
> >
> >
> >
> > 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.
> >
> >
> > >
> > >
> >