Patch for MS Hyper V (virtualization)

[Sergey Babkin]

John Baldwin wrote:
> 
> On Monday 06 April 2009 11:12:33 pm Sergey Babkin wrote:

> > Anyway, as far as I can tell, it's only the base register of
> > the simulated DEC21140 device that has this issue, so it's
> > quite possible that the bug is in that device's simulator.
> >
> > I've attached a modified patch that checks conservatively for this
> > precise situation, so it should not break compatibility with
> > anything else. I've tested it on Hyper-V.
> 
> Can you test unmodified FreeBSD 8 on Hyper-V?  It has an extra fix relative to
> 7 to disable decoding via the PCI command register while sizing BARs that may
> address this.

8.0 (February snapshot) seems to have the same issue. 
I've also saved the log of writes that 7.1 does for this device:

reg 10 val ec01
reg 14 val febff000
reg 18 val 0
reg 1c val 0
reg 20 val 0
reg 24 val 0
reg 30 val febe0000
reg 4 val 117
reg 3c val b
reg 3d val 1
reg 3e val 14
reg 3f val 28
reg c val 8
reg d val 40
reg 9 val 0
reg 8 val 20
reg 10 val ec00
reg 14 val febff000
reg 4 val 117
reg 4 val 117

I don't see any ffffffff values.

-SB