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

["Daniel P. Berrangé" <berrange@redhat.com>]

On Tue, Mar 16, 2021 at 01:33:54PM +0100, Igor Mammedov wrote:
> On Mon, 15 Mar 2021 15:05:26 -0700
> Isaku Yamahata <isaku.yamahata@gmail.com> wrote:
> 
> > On Mon, Mar 15, 2021 at 05:58:04PM +0100,
> > Reinoud Zandijk <reinoud@NetBSD.org> wrote:
> > 
> > > I think its better to revert this and fix Linux ;) or make it a selectable
> > > feature as a workaround that's by default OFF :)  
> > 
> > Anyway here is a patch to flip the default.
> > At the moment, this is compile-only tested to provide the change quickly
> > and make discussion progress.
> > 
> > From 50deeed38832ceccfb68f78dd66de5a1741b2897 Mon Sep 17 00:00:00 2001
> > Message-Id: <50deeed38832ceccfb68f78dd66de5a1741b2897.1615845421.git.isaku.yamahata@intel.com>
> > From: Isaku Yamahata <isaku.yamahata@intel.com>
> > Date: Mon, 15 Mar 2021 14:42:33 -0700
> > Subject: [PATCH] ich9, piix4: flip default value for smm-compat
> > 
> > Make default value for smm-compat of ich9, piix4 true to keep old
> > behavior.
> > To get new (and more conformance to ACPI spec) behavior, explicitly
> > set "-global ICH9-LPC.smm-compat=off" or
> > "-global PIIX4_PM.smm-compat=off".
> 
> I'm not sure we should do that,
> it's fine for non-versioned/new machine type to change in incompatible way with old images,
> it's the job of old versioned machines types to maintain compatibility.
> It's of cause pain for users if they use are unable to boot old image
> on newest machine type, but we never promised that and if we made such
> promise we would never be able to fix bugs.

If this incompatibility with Windows 10 is confirmed though, I don't
think it is viable for QEMU to ship the default machine type with
settings that break Windows 10.




Regards,
Daniel
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