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

[Igor Mammedov <imammedo@redhat.com>]

On Mon, 15 Mar 2021 18:55:03 -0700
Isaku Yamahata <isaku.yamahata@gmail.com> wrote:

> On Mon, Mar 15, 2021 at 11:27:29PM +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)  
> > 
> > I've used:
> > 
> > qemu-system-x86_64 -m 4G -smp cores=2 -accel nvmm \
> > 	-snapshot \
> > 	-drive file=/home/reinoud/Downloads/Win10-demo.raw,format=raw \
> > 	-rtc base=localtime,clock=host \
> > 	-spice port=5924,disable-ticketing=on \
> > 	-vga qxl \
> > 	-usb -device usb-tablet \
> > 	-net nic -net tap,ifname=tap0,script=no &
> > 
> > If I add in '-M pc-i440fx-5.2' it works again with the accelerator. If I add
> > in '-M q35' it does work fine with or without the accelerator.  
> 
> Anyhow, can you please try "-global PIIX4_PM.smm-compat=on"
> (or "-global ICH9-LPC.smm-compat=on" if q35 is used) so that the old behavior
> is presented.
> 
> 
> > Surprisingly without accelerator ie with tcg the default machine does seem to
> > get to the login prompt. Is the ACPI data tailored to indicate an
> > accelerator/VM or is it static? Could it be that the CPU reported by my
> > machine is causing the issue? With the NVMM accelerator it passes on the hosts  
> 
> I think tcg case can be explained by x86_machine_is_smm_enabled()
> 
>   bool x86_machine_is_smm_enabled(const X86MachineState *x86ms)
>   ...
>       if (tcg_enabled() || qtest_enabled()) {
>           smm_available = true;
>       } else if (kvm_enabled()) {
>           smm_available = kvm_has_smm();
>       }
>   ...
> 
> Although I don't know about nvmm case, this function also needs to be updated
> if smi isn't supported.
can you submit a patch for this please?

> 
> Thanks,
> 
> 
> > CPU:
> > 
> > cpu0: "Intel(R) Celeron(R) 2957U @ 1.40GHz"
> > cpu0: Intel 4th gen Core, Xeon E3-12xx v3 (Haswell) (686-class), 1396.77 MHz
> > cpu0: family 0x6 model 0x45 stepping 0x1 (id 0x40651)
> > 
> > Running with NVMM gives the following warnings that might be relevant though
> > doesn't seem to bother the BSDs nor Linux last time I tried and Google tells
> > me they are power saving related MSRs:
> > 
> > qemu-system-x86_64: NVMM: Unexpected RDMSR 0x611, ignored
> > qemu-system-x86_64: NVMM: Unexpected RDMSR 0x641, ignored
> > qemu-system-x86_64: NVMM: Unexpected RDMSR 0x606, ignored
> > qemu-system-x86_64: NVMM: Unexpected RDMSR 0x606, ignored
> > qemu-system-x86_64: NVMM: Unexpected RDMSR 0x641, ignored
> > qemu-system-x86_64: NVMM: Unexpected RDMSR 0x611, ignored
> > 
> > I am not sure if that makes ACPI take a different route or not.
> > 
> > The Windows used is
> > 	Windows 10 Enterprise Evaluation
> > 	Build 17763.rs5_release.180914-1434
> > 	version 1809
> > 
> > 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.
> > 
> > The NVMM accelerator was presented here before but is not yet committed. Its
> > API/construction is similar to WHPX.
> > 
> > As for the cause, I don't know; q35-6.0 works so why isn't pc-i440fx-6.0 ?
> > 
> > With regards,
> > Reinoud
> > 
> >   
>