Re: Re: windows7 installer lockup with viridian=1

[Frank van der Linden <Frank.Vanderlinden@Sun.COM>]

Andrew Lyon wrote:
> On Sun, Apr 26, 2009 at 6:02 PM, Andrew Lyon <andrew.lyon@gmail.com> 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