Re: [Xen-devel] Re: windows7 installer lockup with viridian=1

[Frank van der Linden <Frank.Vanderlinden@xxxxxxx>]

Andrew Lyon wrote:
> On Sun, Apr 26, 2009 at 6:02 PM, Andrew Lyon <andrew.lyon@xxxxxxxxx> wrote:
> > Hi,
> >
> > I've been testing both 64 and 32 bit flavour of windows 7 on Xen since
> > the first public beta release, a few weeks ago I upgraded to Xen
> > unstable and added viridian=1 to all of my smp windows guests as it
> > prevents bsod bugcheck code 101 when under heavy load, today I tried
> > to upgrade my windows 7 hvm's to build 7077 and found that the
> > installer/bootloader locks up if viridian=1 is set.
> >
> > It is not the installer that locks up as such, its the windows 7
> > equivalent of the boot progress bar that all recent versions of
> > windows display before the graphics drivers are loaded and the display
> > switches to a higher resolution with the mouse active.
I can reproduce this on our Xen bits (which is 3.3.x plus some patches, 
including the viridian code).
When I modify the viridian code to not advertise the APIC-via-MSR 
capability, Windows 7 boots just fine. With it, it hangs at the same 
point you describe.
I don't recall that this happened when I initially tested Windows 7, so 
perhaps something changed in the vlapic code that triggers this issue.
- Frank

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