Re: Windows 10 won't run on default x86_64 machine anymore

[Igor Mammedov]

On Mon, 15 Mar 2021 23:27:29 +0100
Reinoud Zandijk <reinoud@NetBSD.org> wrote:

> On Mon, Mar 15, 2021 at 06:53:02PM +0100, Igor Mammedov wrote:
> > Windows 10 1607x64 boots fine when I test it with default machine.
> > 
> > So
> >   1) can you provide full QEMU command line used
> >   2) What Windows build do you use
> >   3) is it existing guest image (i.e. installed in older QEMU version)  
[...]
> 
> The image file was downloaded pre-installed from Microsoft for Edge browser
> evaluation. I used it first on Qemu 5.1 IIRC and it kept working in Qemu 5.2.

issue looks similar to:
0a343a5add7 i386/acpi: restore device paths for pre-5.1 vms

I think that's the problem, the old Windows image (installed on old QEMU),
may fail to boot if started on newest machine type of a newer QEMU.
User should use versioned machine type (the same version it was installed on)
to keep it working the same way otherwise there is no promise that machine ABI
won't change.

> 
> The NVMM accelerator was presented here before but is not yet committed. Its
> API/construction is similar to WHPX.
does it work with kvm for the same image/configuration?

 
> As for the cause, I don't know; q35-6.0 works so why isn't pc-i440fx-6.0 ?
> 
> With regards,
> Reinoud
> 
>