Date: Tue, 07 Apr 2009 21:14:26 -0400 From: Sergey Babkin <babkin@verizon.net> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-hackers@freebsd.org, Ivan Voras <ivoras@freebsd.org> Subject: Re: Patch for MS Hyper V (virtualization) Message-ID: <49DBFA72.9E64AB4F@verizon.net> References: <1366225354.253456.1238948619308.JavaMail.root@vms124.mailsrvcs.net> <200904061342.22000.jhb@freebsd.org> <49DAC4A1.589A5FE@verizon.net> <200904070921.14294.jhb@freebsd.org>
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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
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