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

[Igor Mammedov]

On Tue, 16 Mar 2021 18:17:50 +0100
Igor Mammedov <imammedo@redhat.com> wrote:

> On Tue, 16 Mar 2021 17:28:52 +0100
> Reinoud Zandijk <reinoud@NetBSD.org> wrote:
> 
> > On Tue, Mar 16, 2021 at 01:53:01PM +0100, Igor Mammedov wrote:  
> > > > 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 machine setup doesn't mind changing the machine to the Q35 type; its 
> > only
> > the older machine thats failing to work.  
> 
> never-mind, either we have a bug on piix4 side of QEMU or Windows doesn't 
> support
> smm less mode, probably the former since q35 works.
> I'm trying to dig out what's going wrong,
> maybe Isaku Yamahata can also look into it.

Thanks for reporting it before it was released
please test/review fix that I've just posted:

 "[PATCH for-6.0] x86:acpi:piix4: reinitialize PM1.CNT on reset"

> > 
> > Reinoud
> > 
> >   
> 
>